• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    POLYMERIC ROD GUIDE TO A PISTON ROD AND INSTALLATION PROCESS. A polymeric rod guide for a piston rod is described, said polymeric rod guide having a body surrounding and coaxial with the piston rod, and molded in fixed contact with the rod. The body has a polygonal cross section and a number of blades, longitudinally disposed and extending from the body, each blade having a pair of flat longitudinal side walls and an outer longitudinal edge, each of said blades having a first blade face disposed between a first blade end end and the outer longitudinal edge, and a second blade face disposed between a second blade end end and the outer longitudinal edge, and a body area between the longitudinal side wall of a first blade and the longitudinal sidewall of an adjacent second blade defines a trough having a number of flat surfaces.
    公开号:BR102012027414B1
    申请号:R102012027414-0
    申请日:2012-10-25
    公开日:2021-05-11
    发明作者:Matías Pereyra；Alejandro Levrino；Bernardo Bouillard
    申请人:Tenaris Connections B.V.；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    [0001] This invention relates generally to the field of guides for a series of piston rods, and more particularly to a rod guide with a polygonal body and several blades. BACKGROUND
    [0002] Rod guides for centering piston rods within production piping are well known in the art. As shown in Figure 1, a pumping unit 8 has fixed to it a polishing rod 9. The polishing rod 9 is secured longitudinally to a piston rod 10, arranged inside a pipe (T), which is arranged in a series. of casings (C). At the bottom end of the piston rod 10 is an alternative type pump (not shown). As the pumping unit moves down the piston rod 10, the drum of the alternative type pump is filled with the production fluid to be produced. Conversely, as the pumping unit moves the piston rod upwards, a valve on the alternative type pump is closed, and the production fluid in the pump drum is suspended, displacing the production fluid above it and forcing a part of the production fluid pump drum out of the hole.
    [0003] The piston rod must extend from the pump unit completely below the alternative type pump, which may be several thousand meters (feet) below the surface. Consequently, the piston rod is subjected to various stresses: compression, tension, torsion and bending. The rod is prevented from laterally moving or swaying by installing periodic rod guides 12, 14 on the rod 10, thereby controlling the wear of the rod and tubing. Stem guides typically have multiple vanes, fins or blades, which extend radially and center the stem within the cylindrical tubing. This prevents the stem from wearing out or suffering other damage. Any wear will thus occur on the rod guide fins.
    [0004] Rod guides can be manufactured from various materials, such as synthetic materials, which are oil resistant and abrasion resistant.
    [0005] It is desirable to maximize the material available for wear to maximize the service life of the rod guides. In this way, the cross-sectional area of the vanes / blades / vanes can be maximized for maximum wear life.
    [0006] Many prior art piston rod guides (see U.S. Patents 5,115,863, 5,358,041 and 6,152,223) include a body, which is molded into intimate contact with the piston rod. The body has simultaneously molded with it several "fins", "blades" or "blades", which extend radially from the body. The cross-sections of prior art rod guides 12 and 14 are illustrated in Figures 1A and 1B. SUMMARY OF THE INVENTION
    [0007] The present invention describes and illustrates a polymeric rod guide 26 for a piston rod 10. The polymeric rod guide includes: a body 28 surrounding and coaxial with the piston rod, said body having a molded polygonal cross section in fixed contact with the piston rod. The guide further includes a plurality of blades 30, longitudinally disposed and extending from the body 28, each blade having a pair of flat longitudinal side walls 40 and an outer longitudinal edge 24, each of said blades having a first blade face 22 disposed. between a first end end 23 of the blade and the outer longitudinal edge 24, and a second end face 22 of the blade, disposed between a second end end 25 of the blade and the outer longitudinal edge 24, and an area of the body between the longitudinal side wall 40 of a first blade and longitudinal sidewall 40 of an adjacent second blade define a chute 32 having a plurality of flat surfaces 32a, 32b, 32c.
    [0008] In some embodiments, the rod guide 26 further includes a first curved lead section 34, molded integral with the body 28. The lead section is disposed longitudinally around the rod and terminates at a first end of an outer surface of the shank and is disposed at a second end, in integral contact with the body 28. The lead section has a curved surface 35 with a radius of curvature between 20 and 22 mm. In some embodiments, the curved first advance section 34 has an outer curved surface 35 that extends from the shank to the body. The curved surface defined by a tangent to the midpoint of the curved surface has an angle between 5 and 20 degrees, measured between a line parallel to the longitudinal axis of the rod and tangent to the curved surface 35 of the feed section 34.
    [0009] In the preferred embodiment, the rod guide 26 includes 4 blades circumferentially disposed at 90 degrees around the guide body 28.
    [0010] In some embodiments, the outer longitudinal edge 24 of the rod guide 26 has a convex curved surface, with a radius of curvature equal to the radius of curvature of an inner surface of a tube (T), in which the rod and the rod guide will be used.
    [0011] In the first embodiment, the gutter 32, between the longitudinal side walls, includes: a first flat surface 32a, which narrows from the first terminal end 23 of the blade face 22 at an angle (a1), measured between a parallel line the longitudinal axis of the rod and the first flat surface (a); a second flat surface 32b disposed adjacent the first flat surface (a); and a third planar surface 32c disposed adjacent the second planar surface, said third planar surface narrowing from the second terminal end 25 of the blade face 22 at an angle (c1) measured between a line parallel to the longitudinal axis of the rod and the third flat surface 32c. The angle (a1) is generally equal to or less than 15 degrees, and the second flat surface is generally parallel to the axis of the rod, and the angle (c1) is equal to or less than 15 degrees. In the preferred embodiment, angle (a1) is equal to or less than 4 degrees, the second flat surface is generally parallel to the axis of the rod, and angle (c1) is equal to or less than 4 degrees.
    [0012] In the first embodiment, the blade face 22 comprises a curved surface, which extends from the first terminal end 23 of the blade to the outer longitudinal edge 24, said curved surface defined by a tangent with the intermediate point of the curved surface has an angle in the range of 10 to 40 degrees, measured between a line parallel to the longitudinal axis of the rod and tangent to the curved surface of blade face 22. Blade face 22 includes a curved surface extending from the first end end 23 to the outer longitudinal edge 24, said curved surface having a radius of curvature in the range of 20 to 22 mm.
    [0013] In the first embodiment, the second flat surface 32b has a predetermined first longitudinal length (Lb), parallel to the axis of the rod, both the first flat surface 32a and the third flat surface 32c have a longer longitudinal length (La, Lc) than the longitudinal length (Lb) of the flat surface (b).
    [0014] In some embodiments, the longitudinal length of the first flat surface 32a and the third flat surface 32c is between 55 and 75 mm, and the second flat surface 32b has a longitudinal length between 0 and 30 mm.
    [0015] In a preferred embodiment, the longitudinal length (Lb) of the second flat surface 32b may be at least twice the width of the second flat surface 32b.
    [0016] In a second embodiment, a polymeric rod guide 126 for a piston rod 110 includes a body 128, surrounding and coaxial with the piston rod. The body has: a polygonal cross section molded into fixed contact with the rod; a plurality of blades 130 longitudinally disposed and extending from the body 128; each blade having a pair of longitudinal side walls 140, each of said longitudinal side walls having a first flat surface 140a narrowing from the first terminal end 123 of blade face 122 at an angle (a') measured between a line parallel to the longitudinal axis of the rod and the first flat surface; a second planar surface 140b disposed adjacent the first planar surface and a third planar surface 140c disposed adjacent the second planar surface, said third planar surface 140c tapering from the second end end 125 of the blade face 122 at an angle (c '), measured between a line parallel to the longitudinal axis of the rod and the third flat surface 140c. Each blade has an outer longitudinal edge 124, and each of the blades has a first blade face 122 disposed between a first end end 123 of the blade and the outer longitudinal edge 124, and a second blade face 122 disposed between a second blade. blade end end 125 and outer longitudinal edge 124. The body area between the longitudinal side wall of a first blade and the longitudinal side wall of an adjacent second blade defines a trough 132 having a plurality of flat surfaces 132a, 132b, 132c.
    [0017] In some embodiments, the angle (a') is less than 15 degrees, the second flat surface is generally perpendicular to the axis of the rod, and the angle (c') is less than 15 degrees.
    [0018] In the preferred embodiment, the angle (a') is equal to or less than 4 degrees, the second flat surface is generally perpendicular to the axis of the rod, and the angle (c') is equal to or less than 4 degrees.
    [0019] In the rod guide 126, the second flat surface 140b has a predetermined first longitudinal length (Lb') parallel to the axis of the rod, both the first flat surface 140a and the third flat surface 140c have a longitudinal length (La' , Lc') greater than the longitudinal length (Lb') of the flat surface 140b.
    [0020] The longitudinal length of the first flat surface 140a and the third flat surface 140c is between 55 and 75 mm, and the second flat surface 140b has a longitudinal length between 0 and 30 mm.
    [0021] In a preferred embodiment, the longitudinal length (Lb') of the second flat surface 140b is at least twice a width of the second flat surface 140b.
    [0022] The rod guide 126 further includes a first curved lead section 134, molded integral with the body 128. The lead section is disposed longitudinally around the rod and ends at a first end, on an outer surface of the rod, and disposed at a second end, in integral contact with the body 128. The lead section has a curved surface 135, with a radius of curvature between 20 and 22 mm.
    [0023] The curved surface, defined by a tangent with the intermediate point of the curved surface, having an angle between 5 and 20 degrees, measured between a line parallel to the longitudinal axis of the rod and the tangent with the curved surface 135 of the feed section 34.
    [0024] In the preferred embodiment, the rod guide 126 includes 4 blades circumferentially disposed at 90 degrees around the guide body 128.
    [0025] In some embodiments, the outer longitudinal edge 124 of the rod guide 126 has a curved convex surface, with a radius of curvature of the same radius of curvature as an inner surface of a tube (T), in which the rod and the rod guide will be used.
    [0026] In the second embodiment, the chute 132, between the longitudinal side walls, includes: a first flat surface 132a, which narrows from the first terminal end 123 of the blade face 122 at an angle (a1), measured between a parallel line to the longitudinal axis of the rod and the first planar surface 132a, a second planar surface 132b disposed adjacent the first planar surface 132a; and a third planar surface 132c disposed adjacent to the second planar surface 132b, said third planar surface 132c narrowing from the second terminal end 125 of the blade face 122 at an angle (c1) measured between a line parallel to the longitudinal axis of the rod and third flat surface 132c. Angle (a1) is 4 degrees or less, the second flat surface is generally parallel to the shaft axis, and angle (c1) is 4 degrees or less.
    [0027] In the second embodiment, the blade face 122 comprises a curved surface, which extends from the first terminal end 123 of the blade to the outer longitudinal edge 124. The curved surface defined by a tangent to the intermediate point of the curved surface has a angle in the range of 10 to 40 degrees, measured between a line parallel to the longitudinal axis of the rod and tangent to the curved surface of blade face 122. Blade face 122 includes a curved surface extending from the first end end 123 to the outer longitudinal edge 124.
    [0028] In the second implementation, the second flat surface 132b has a predetermined first longitudinal length (Lb) parallel to the axis of the rod, both the first flat surface 132a and the third flat surface 132c have a greater longitudinal length (La, Lc) than the longitudinal length (Lb) of the flat surface 132b. The longitudinal length of the first flat surface 132a and the third flat surface 132c is in the range of 55 to 75 mm, and the second flat surface 132b has a longitudinal length in the range of 0 to 30 mm. In a preferred embodiment, the longitudinal length (Lb) of the second flat surface 132b may be at least twice the width of the second flat surface 132b.
    [0029] The rod guide 26 can be installed on a piston rod in a process comprising: molding a coaxial unitary rod guide around and in fixed contact with the piston rod, said guide comprising a body part 28, surrounding and coaxial with the piston rod, said body having a plurality of blades 30, longitudinally disposed and extending from body 28, each blade having a pair of flat longitudinal side walls 40 and an outer longitudinal edge 24, all of which blades having a first blade face 22 disposed between a first end end 23 of the blade and the outer longitudinal edge 24, and a second blade face 22 disposed between a second end end 25 of the blade and the outer longitudinal edge 24, and an area of the body between the longitudinal side wall 40 of a first blade and the longitudinal side wall 40 of an adjacent second blade defines a trough 32 having a plurality of flat surfaces 32a, 32b, 32c.
    [0030] The process may further include concurrent molding of a first advance section 34 integral with the body 28, said advance section disposed longitudinally around the rod and ending at a first end of an outer surface of the rod and disposed in a second end, in contact with the body 28, said advancing section having a curved surface 35, with a radius of curvature between 20 and 22 mm, and said curved surface, further defined by a tangent with the intermediate point of the curved surface , having an angle between 5 and 20 degrees, measured between a line parallel to the longitudinal axis of the rod and tangent to the curved surface 35 of the feed section 34.
    [0031] The process may further include preparing a section of the rod 10 by placing an epoxy-based glue on a predetermined part of the rod, and placing particles having a diameter in the range of 0.71 to 1, 18 mm, in epoxy glue; and direct injection molding the rod guides 26, 126 around at least a portion of the prepared section of the rod.
    [0032] Rod guide 126 can be installed on a piston rod in a process comprising: molding a coaxial unitary rod guide around, and in fixed contact with, the piston rod, said guide comprising a body part 28, surrounding and coaxial with the piston rod, said body having a plurality of blades 30, longitudinally disposed and extending from the body 28, each blade having a pair of longitudinal side walls 140, each of said longitudinal side walls having a first flat surface 140a, which narrows from the first terminal end 123 of blade face 122 at an angle (a'), measured between a line parallel to the longitudinal axis of the shank and the first flat surface, a second flat surface 140b, disposed adjacent to the first planar surface, and a third planar surface 140c disposed adjacent to the second planar surface, said third planar surface 140c narrows from the second end end 125 of blade face 122a. an angle (c') measured between a line parallel to the longitudinal axis of the rod and the third flat surface 140c, each blade having an outer longitudinal edge 124, each of said blades having a first blade face 122 disposed between a first blade. blade end end 123 and outer longitudinal edge 124, and a second blade face 122 disposed between a blade second end end 125 and outer longitudinal edge 124, and an area of the body between the longitudinal side wall of a first. The blade and the longitudinal side wall of an adjacent second blade define a trough 132 having a plurality of flat surfaces 132a, 132b, 132c.
    [0033] The process may further include concurrent molding of a first curved advance section 34, integral with the body 28, said advance section disposed longitudinally around the rod and ending at a first end of an outer surface of the rod and disposed at a second end, in contact with the body 28, said advancing section having a curved surface 35, with a radius of curvature between 20 and 22 mm, and said curved surface further defined by a tangent with the midpoint of the surface curve having an angle between 5 and 20 degrees, measured between a line parallel to the longitudinal axis of the rod and tangent to the curved surface 35 of the feed section 34.
    [0034] The process may further include: preparing a section of rod 10 by placing an epoxy-based glue on a predetermined portion of the rod 10, and placing particles having a diameter between 0.71 and 1.18 mm in the glue. epoxy; and direct injection molding the rod guide 26, 126 around at least a portion of the prepared section of the rod.
    [0035] Details of one or more embodiments of the invention are presented in the attached drawings and in the description below. Other aspects, objects and advantages of the invention will become apparent from the description and drawings, and from the claims. DESCRIPTION OF DRAWINGS
    [0036] Figure 1 is a prior art pumping system illustrating a prior art rod guide disposed within a pipe leg.
    [0037] Figure 1A is an oblique cross section of a prior art rod guide.
    [0038] Figure 1B is an oblique cross section of a prior art rod guide.
    [0039] Figure 2 is a side view of a first embodiment of a rod guide of the present invention, illustrated within a cross-section of the pipe.
    [0040] Figure 2A is an oblique cross section of the rod guide of Figure 2, taken in section AA.
    [0041] Figure 2B is an oblique cross section of the rod guide of Figure 2, taken in section BB.
    [0042] Figure 3 is a perspective view of the rod guide of Figure 2.
    [0043] Figure 4 is a partial side view of the rod guide of Figure 2, rotated partially forward, to illustrate the flat surfaces 32a, 32b and 32c of the blade 30.
    [0044] Figure 4A is a cross-sectional view illustrating the chute 32, between the blades 30 of the rod guide of Figure 4.
    [0045] Figure 5 is a side view of a second embodiment of a rod guide of the present invention, illustrated within a cross-section of piping.
    [0046] Figure 5A is an oblique cross section of the rod guide of Figure 5, taken in section AA.
    [0047] Figure 5B is an oblique cross section of the rod guide of Figure 5, taken in section BB.
    [0048] Figure 6 is a perspective view of the rod guide of Figure 5.
    [0049] Figure 7 is a partial side view of the rod guide of Figure 5, rotated partially forward, to illustrate the flat surfaces 132a, 132b and 132c and 140a, 140b and 140c of the blade 30.
    [0050] Figure 7A is a cross-sectional view illustrating the chute 132, between the blades 130 of the rod guide of Figure 7.
    [0051] Similar reference symbols in the various drawings indicate similar elements. DETAILED DESCRIPTION
    [0052] As used in this specification, the term "blade" refers to the molded part of the rod guide, which extends from the body and can contact, in the form of a guide, the inner surface of the production piping.
    Reference is then made to Figures 2, 2A, 2B, 3, 4 and 4A, in which a first embodiment of the piston rod guide 26 of the present invention is illustrated. The polymeric rod guide 26 includes a body 28, surrounding and coaxial with the plunger rod. The body includes a polygonal cross section molded into fixed contact with the piston rod.
    [0054] Several blades 30 are arranged and extend longitudinally from body 28, each blade having a pair of flat longitudinal side walls 40 and an outer longitudinal edge 24. Each of said blades has a first blade face 22, disposed between a first blade end end 23 and outer longitudinal edge 24, and a second blade face 22 disposed between a second blade end end 25 and outer longitudinal edge 24. An area of the body between longitudinal side wall 40 of a first blade and the longitudinal side wall 40 of an adjacent second blade define a trough 32 having a plurality of flat surfaces 32a, 32b, 32c.
    [0055] The rod guide 26 further includes a generally curved first lead section 34, molded integral with the body 28. The lead section is disposed longitudinally around the rod and terminates at a first end of an outer surface of the rod and at a second end of each of the primary end ends 23, 25 of each blade and at one end end of each chute 32, between all of the blades 30. The advance section 34 has an outer surface 35, which extends from the shank to the body 28. The outer curved surface 35 has a small radius of curvature between 20 and 22 mm. The narrowing of the curved surface 35 is defined by a tangent to the midpoint of the curve, having an angle between 5 and 20, measured between the tangent and a line parallel to the longitudinal axis of the rod and the curved surface of the feed section 34. preferred embodiment, the angle of the tangent is 15 degrees.
    [0056] In some embodiments, the rod guide 26 includes four blades 30, circumferentially disposed at 90 degrees around the guide body 28.
    [0057] In some embodiments, the outer longitudinal edge 24 of the rod guide 26 has a convex curved surface, with a radius of curvature being equal to the radius of curvature of an inner surface of a tube (T), in which the rod is the rod guide are going to be used.
    [0058] As shown in particular in Figures 3, 4 and 4A, the runner 32 between the longitudinal side walls 40 includes: a first flat surface 32a which narrows from the first terminal end 23 of the blade face 22 at an angle (a1 ), measured between a line parallel to the longitudinal axis of the rod and the first flat surface (a); a second flat surface 32b disposed adjacent the first flat surface (a); and a third planar surface 32c disposed adjacent the second planar surface, said third planar surface narrowing from the second terminal end 25 of the blade face 22 at an angle (c1) measured between a line parallel to the longitudinal axis of the rod and the third flat surface (c). In some embodiments, angle (a1) is 15 degrees or less, the second flat surface is generally parallel to the axis of the rod, and angle (c1) is 15 degrees or less. In a preferred embodiment, angle (a1) is equal to or less than 4 degrees, the second flat surface is generally parallel to the axis of the rod, and angle (c1) is equal to or less than 4 degrees. In a preferred embodiment angle a1 = angle a2. In general, the chute 32 includes three sections: Section (a): having an increasing narrowing (from the end of the guide to the center of the guide); Section (b): having a substantially cylindrical configuration; and Section (c): having a decreasing narrowing (from the center of the guide to the end of it). As illustrated in Figures 2, 2A and 2B, the cross-sectional area 44 of the fluid passage cavity formed between the blades and the tubing (T) is greater at the beginning of the piston rod guide than at the intermediate part. of it, and thereby provides a desired mouthpiece effect, which will be explained below in the discussion of the advantages of the present elaboration.
    [0059] Referring again to Figures 3, 4 and 4A, in some embodiments, the blade face 22 comprises a curved surface having a small radius of curvature in the range of 20 to 22 mm. The surface narrowing is defined by a tangent to the curved surface, taken at the midpoint of the curve. The angle of the tangent is between 10 and 40 degrees, measured between a line parallel to the longitudinal axis of the rod and tangent to the curved surface of blade face 22. In a preferred embodiment, blade face 22 comprises a curved surface having a small radius of curvature in the range of 20 to 22 mm. The surface narrowing is defined by a tangent to the curved surface, taken at the midpoint of the curve. The angle of the tangent is equal to or less than 32 degrees, measured between a line parallel to the longitudinal axis of the rod and tangent to the curved surface of blade face 22. In some embodiments, there may be a flat surface between blade face 22 and surface 35 of feed section 34, but generally the curved surfaces join each other tangentially as illustrated in Figures 2, 3 and 4. The second flat surface 32b of the rod guide 26 has a first longitudinal length (Lb ) predetermined, parallel to the axis of the rod, both the first flat surface 32a and the third flat surface 32c have a longitudinal length (La, Lc) greater than the longitudinal length (Lb) of the flat surface 32b. In some embodiments, the longitudinal length of the first flat surface 32a and the third flat surface 32c is between 55 and 75 mm (preferably 65 mm), and the second flat surface 32b has a longitudinal length between 0 and 30 mm. In a preferred embodiment, to stabilize the fluid, the longitudinal length (Lb) of the second flat surface 32b is at least twice the width of the second flat surface (32b).
    Reference will then be made to Figures 5, 5A, 5B, 6, 7 and 7A which illustrate a second embodiment of the piston rod guide 126 of the present invention. The polymeric piston rod guide 126 to a piston rod 110 includes a body 128, surrounding and coaxial with the piston rod. The body has a polygonal cross section, molded into fixed contact with the piston rod.
    [0061] Unlike the first embodiment, in this second embodiment, the side surfaces 140 of all blades 130 are also formed by the narrowed surfaces 140a, 140b and 140c. In this second embodiment, the rod guide 126 includes a plurality of blades 130, longitudinally disposed and extending from the body 128. The blades all have a pair of longitudinal side walls 140, each of which has a first flat surface 140a, which narrows from the first end end 123 of blade face 122 at an angle (a') measured between a line parallel to the longitudinal axis of the shank and the first flat surface, a second flat surface 140b disposed adjacent the first flat surface, and a third surface planar 140c, disposed adjacent to the second planar surface, said third planar surface 140c narrows from the second terminal end 125 of the blade face 122 at an angle (c') measured between a line parallel to the longitudinal axis of the rod and the third surface flat 140c. Each blade has an outer longitudinal edge 124. Each blade has a first blade face 122 disposed between a first end end 123 of the blade and the outer longitudinal edge 124, and a second blade face 122 disposed between the second end end 125 of the blade and the outer longitudinal edge 124.
    [0062] In some embodiments, the angle (a') is less than 15 degrees, the second flat surface is generally perpendicular to the axis of the rod, and the angle (c') is less than 15 degrees. In a preferred embodiment, angle (a') is equal to or less than 4 degrees, the second flat surface is generally perpendicular to the axis of the rod, and angle (c') is equal to or less than 4 degrees. In general, the side face 140 includes three sections: Section (a): having an increasing narrowing (from the end of the guide to the center of the guide); Section (b): having a substantially cylindrical configuration; and Section (c): having a decreasing narrowing (from the center of the guide to the end of it).
    [0063] The second flat surface 140b has a predetermined first longitudinal length (Lb') parallel to the axis of the rod, both the first flat surface 140a and the third flat surface 140c have a longitudinal length (La', Lc') greater than than the longitudinal length (Lb') of the flat surface (b). In some embodiments, the longitudinal length of the first flat surface 140a and the third flat surface 140c is between 55 and 75 mm (preferably 65 mm), and the second flat surface 140b has a longitudinal length of between 0 and 30 mm. In a preferred embodiment, the longitudinal length (Lb') of the second flat surface 140b is at least twice a width of the second flat surface 140b, to stabilize the fluid.
    [0064] As illustrated in Figures 5, 5A and 5B, the cross-sectional area 144 of the cavity for the fluid passage, formed between the blades and the tubing (T), is greater at the beginning of the piston rod guide than in the middle part of it, and thus provides the desired mouthpiece effect, which will be explained in the next section.
    [0065] The guide further includes a generally curved first lead section 134, molded integral with the body 128. The lead section 134 is disposed longitudinally around the rod and terminating at a first end of an outer surface of the rod and at a second end on the body 128. The advance section 134 has a generally curved outer surface 135, which extends from the shank to the body 28. The outer surface 135 has a small radius of curvature between 20 and 22 mm. The narrowing of the curved surface 135 is defined by a tangent to the midpoint of the curve, having an angle between 5 and 20, measured between the tangent and a line parallel to the longitudinal axis of the shank and the curved surface of the feed section 34. preferred embodiment, the angle of the tangent is 15 degrees.
    [0066] In a preferred embodiment, the various blades 130 include 4 blades, circumferentially disposed at 90 degrees around the guide body 128. In some embodiments, the outer longitudinal edge 124 has a convex curved surface, with a radius of curvature being equal to the radius of curvature of an inner surface of a tube (T), in which the rod and rod guide are to be used.
    [0067] Similar to the first embodiment, in this second embodiment, an area of the body 128, between the longitudinal side wall 140 of a first blade and the longitudinal side wall of an adjacent second blade, defines a chute 132 having a plurality of flat surfaces 132a, 132b, 132c. In a preferred embodiment, the runner 132 between the longitudinal side walls includes: a first flat surface 132a that narrows from the first end end 123 of the blade face 122 at an angle (a1), measured between a line parallel to the longitudinal axis. of the rod and the first flat surface (a); a second flat surface 132b disposed adjacent to the first flat surface 132a; and a third planar surface 132c disposed adjacent to the second planar surface 132b, said third planar surface 132c narrows from the second terminal end 125 of the blade face 122 at an angle (c1), measured between a line parallel to the longitudinal axis of the rod. and the third flat surface (c). Angle (a1) is 4 degrees or less, the second flat surface is generally parallel to the shaft axis, and angle (c1) is 4 degrees or less. In a preferred embodiment angle a1 = angle a2. In general, the chute 32 includes three sections: Section (a): having an increasing narrowing (from the end of the guide to the center of the guide); Section (b): having a substantially cylindrical configuration; and Section (c): having a decreasing narrowing (from the center of the guide to the end of it). As illustrated in Figures 5, 5A and 5B, the cross-sectional area 144 of the fluid passage cavity formed between the blades and the tubing (T) is greater at the beginning of the piston rod guide than at the intermediate part. of it, and thereby provides a desired mouthpiece effect, which will be explained below in the discussion of the advantages of the present elaboration.
    [0068] Referring again to Figures 6, 7 and 7A, in some embodiments blade face 122 has a curved surface with a small radius of curvature in the range of 20 to 22 mm. The surface narrowing is defined by a tangent to the curved surface, taken at the midpoint of the curve. The angle of the tangent is between 10 and 40 degrees, measured between a line parallel to the longitudinal axis of the rod and tangent to the curved surface of blade face 122. In a preferred embodiment, blade face 122 comprises a curved surface having a small radius of curvature in the range of 20 to 22 mm. The surface narrowing is defined by a tangent to the curved surface, taken at the midpoint of the curve. The angle of the tangent is equal to or less than 32 degrees, measured between a line parallel to the longitudinal axis of the rod and tangent to the curved surface of blade face 122. In some embodiments, there may be a flat surface between blade face 122 and surface 135 of feed section 134, but generally the curved surfaces join each other tangentially, as illustrated in Figures 5, 6 and 7.
    [0069] The second flat surface (b) has a predetermined first longitudinal length (Lb) parallel to the axis of the rod, both the first flat surface 32a and the third flat surface 32c have a longitudinal length (La, Lc) greater than the longitudinal length (Lb) of the flat surface (b). In some embodiments, the longitudinal length of the first flat surface (a) and the third flat surface (c) is between 55 and 75 mm (preferably 65 mm), and the second flat surface 32b has a longitudinal length between 0 and 30 mm. In a preferred embodiment, to stabilize the fluid, the longitudinal length (Lb) of the second flat surface 132b is at least twice the width of the second flat surface 132b.
    [0070] The unitary rod guide 26, 126 of the present invention is molded coaxial around and in fixed contact with the piston rod 10. The advance section 34, 134 is unitary and molded concurrently with the body 28, 128 .
    [0071] It is known in the art that when plastic rod guides 12, 14 are molded directly onto the rod, the shrinkage effect of the solidifying polymer material in the steel rod body provides a gripping force. In deviated wellbore holes, the grip force provided by the contraction of the polymeric material in the stem may be insufficient to prevent the stem guide from retaining the stem. It has been found that the breakout force required to displace the polymeric rod guide can be intensified by increasing the interference between the polymeric rod guide 26, 126 and the rod 10. It has been found that the interference can be accentuated by increasing of the coefficient of friction between rod 10 and rod guide 26, 126. In one embodiment, epoxy-based glue (stable at 150°C) can be placed on rod 10, and particles having a diameter between 0.71 and 1.18 mm (preferably 0.8 mm) (sand or synthetic beads), placed in the epoxy glue along each section of the rod, before the polymeric rod guide 26, 126, are molded by direct injection therein. In some embodiments, it has been found that if a 120 mm section of the rod is prepared as described so far, the breakout force provided by the intensified friction coefficient may be equivalent to the force obtained with direct injection into a rod, which does not had this superficial preparation. SOME ADVANTAGES OF THE ROD GUIDE OF THE PRESENT INVENTION
    [0072] The prior art elaborations of Figures 1A and 1B illustrate transition zones of concave or convex surfaces between the blades of the rod guides 12. In the illustrated prior art rod guides 12, 14, these transition zones have a section constant transverse along the body part of the rod guide. In the constant cross-sectional geometry of the prior art, consider that there are conditions of zero friction (between the rod guide walls and the fluid produced), that the fluid produced will move at a constant speed along the passage through the tunnel. , set rod guide inside the pipe.
    [0073] When considering the effect of friction between the wall of the rod guide and the fluid produced, the velocity profile starts at 0 and reaches a value at the center of the rod guide. This effect defines what may be referred to as the “boundary layer”. As the speed decreases, it results in a decrease in the Reynolds number, which results in the generation of a boundary layer having a lower energization level, and therefore more prone to loosening of the rod guide surface and the tubing. The release of the boundary layer produces turbulent areas, which cause more inefficient fluid movement and an increase in pressure drop.
    [0074] The elaboration of the present invention includes a variable fluid passage 44 and 144 (a nozzle-shaped configuration), having decreasing cross sections (from the beginning towards the largest intermediate section 32b, 132b of the rod guide 26, 126 ( see Figures 2A, 2B, 3, 5A, 5B and 6.) This geometry produces, due to the fact that the flow remains constant, an increase in the average velocity at the center of the section, which also increases the Reynolds number, and , therefore, the boundary layer results in an increasing velocity profile and higher energization levels, this effect favors keeping the boundary layer adhered to the wall of the rod guide 26 and 126, and, therefore, there are no zones turbulents increasing the pressure drop in the rod guide.
    [0075] The end section 32a, 132a is a stabilization zone, directed to stabilize the fluid velocity profile, to maximize guide efficiency. This stabilization zone is necessary for an even variation in the velocity profile, before entering the intermediate zone, to keep the boundary layer secured to the surface of the rod guide 26, 126.
    [0076] The area of the end sections 32c, 132c, having a decreasing section, allows the fluid to be retarded and reach the same condition as before entering the flow path 44, 144 of the rod guide. The rod guide 26, 126 has a better efficiency relative to fluid flow and relative to the general pumping system.
    [0077] Additionally, with respect to embodiment 2, it is significant to note that the narrowed surfaces 140a, 140b and 140c are designed to improve the overall efficiency of the guide due to the "venturi" effect that occurs when the fluid passes through the fluid passage 144, formed between the production tubing (T) and the longitudinally narrowed surfaces 140a, 140b and 140c. In that embodiment, the side walls 140 of the blades 130 are wider towards the center of the shank guide. For example, referring to Figures 5, 5A and 5B, the width of the blade 130 is greater in sections 132b and 140b than the width in sections 132a and 140a, due to the nozzle shape of the side walls of the blades present in this embodiment. Lower pressures on the centralizer, due to the larger erodible area, make this centralizer more efficient in terms of service life (shorter rod guide life due to erosion).
    [0078] In short, the elaboration of the rod guides 26 and 126 of the present invention has at least the following advantages: 1) Reduction in pumping force (contrary to the direction of leg movement), due to the decrease in the drag coefficient (Cd) of the body
    [0079] The geometries of many prior art rod guides have angles of approximately 30° at the flow edges on each side. The drag coefficients of bodies immersed in fluid, which is a triangular solid of 60° revolution, have a Cd of approximately 1.4. In triangular solids of 30° revolution, Cd decreases to 1.0. The construction of the rod guides 26 and 126 of the present invention has lower incidence angles of approximately 15° per side. This elaboration geometry results in an improved drag coefficient of Cd < 1. This improvement in drag coefficient Cd translates to an approximately 40% reduction in pumping force, which is generated by obstruction in the fluid passage around each rod guide 26, 126, greatly increasing the overall efficiency of the production system, because the angle of surfaces 34 and 234 is around 15 degrees. 2) Stable boundary layer
    [0080] The geometry of the flow channels in the rod guides 26 and 126 favors an increase in velocity in the fluid flowing around the body 28, 128 (increasing velocity gradient). Therefore, the boundary layer remains in contact with the bodies 28, 128 of the guides 26, 126, and thereby preventing flow release and pressure losses. 3) Effect of intense particle movement and crust formation
    [0081] As discussed in point 2), the geometry of the flow channels generates, in the first half, a greater velocity gradient, which favors the intense movement of the particles, preventing the formation of crust on the surface of the rod guide. 4) Greater outside surface area for longer wear surface against pipe wall
    [0082] In this embodiment, due to the fact that the blades 30, 130 are wider in the intermediate section than the prior art blades, the contact area or the erodible area of the rod guide is larger.
    [0083] Several embodiments have been described. However, it should be understood that various modifications can be made. Accordingly, other embodiments are within the scope of the claims set out below.
    权利要求:
    Claims (29)
    [0001]
    1. Polymeric rod guide (26) for a piston rod (10), said polymeric rod guide characterized in that it comprises: a body (28) surrounding and coaxial with the piston rod, said body having a polygonal cross section molded into fixed contact with the piston rod; and a plurality of blades (30), longitudinally disposed and extending from the body (28), each blade having a pair of flat longitudinal side walls (40) and an outer longitudinal edge (24), each of said blades having a first face of blade (22) disposed between a first end end (23) of the blade and the outer longitudinal edge (24), and a second blade face (22) disposed between a second end end (25) of the blade and the edge external longitudinal wall (24), and an area of the body between the longitudinal side wall (40) of a first blade and the longitudinal side wall (40) of an adjacent second blade defines a chute (32) having a plurality of flat surfaces ( 32a, 32b, 32c).
    [0002]
    2. Rod guide (26), according to claim 1, characterized in that the rod guide further includes: a first curved advance section (34), molded integral with the body (28), said section feed section disposed longitudinally around the rod and ending at a first end of an outer surface of the rod and disposed at a second end, in integral contact with the body (28), said advance section having a curved surface (35) with a radius of curvature between 20 and 22 mm, a first curved feed section (34), molded integral with the body (28), said feed section having an outer curved surface (35), which extends from the shank to the body, said curved surface defined by a tangent with the intermediate point of the curved surface having an angle between 5 and 20 degrees, measured between a line parallel to the longitudinal axis of the rod and the tangent with the curved surface (35) of the feed section (34).
    [0003]
    3. Stem guide (26) according to claim 1, characterized in that the outer longitudinal edge (24) has a convex curved surface, with a radius of curvature equal to the radius of curvature of an inner surface of a tube (T), in which the rod and rod guide are to be used.
    [0004]
    4. Rod guide (26), according to claim 1, characterized in that the trough (32), between the longitudinal side walls, includes: a first flat surface (32a), which narrows from the first terminal end (23) of the blade face (22) at an angle (a1), measured between a line parallel to the longitudinal axis of the shank and the first flat surface (a); a second flat surface (32b) disposed adjacent to the first flat surface (a); and a third planar surface (32c) disposed adjacent the second planar surface, said third planar surface narrowing from the second terminal end (25) of the blade face (22) at an angle (c1), measured between a parallel line. to the longitudinal axis of the rod and the third flat surface (32c).
    [0005]
    5. Rod guide (26), according to claim 4, characterized in that the angle (a1) is equal to or less than 15 or 4 degrees, and the second flat surface is generally parallel to the axis of the rod, and the angle (c1) is equal to or less than 15 or 4 degrees.
    [0006]
    6. Stem guide (26) according to claim 1, characterized in that the blade face (22) comprises a curved surface, which extends from the first end end (23) of the blade to the outer longitudinal edge (24), said curved surface defined by a tangent with the intermediate point of the curved surface having an angle in the range of 10 to 40 degrees, measured between a line parallel to the longitudinal axis of the rod and the tangent with the curved surface of the face of blade (22) and have a radius of curvature in the range of 20 to 22 mm.
    [0007]
    7. Rod guide (26), according to claim 4, characterized in that the second flat surface (32b) has a first longitudinal length (Lb) of at least twice the width of the second flat surface (32b) , parallel to the axis of the rod, both the first flat surface (32a) and the third flat surface (32c) having a longitudinal length (La, Lc) greater than the longitudinal length (Lb) of the second flat surface (b).
    [0008]
    8. Stem guide (26), according to claim 7, characterized in that the longitudinal length of the first flat surface (32a) and the third flat surface (32c) is in the range of 55 to 75 mm, and the second flat surface (32b) has a longitudinal length in the range of 0 to 30 mm.
    [0009]
    9. Polymeric rod guide (126), for a piston rod (110), said polymeric rod guide characterized in that it comprises: a body (128) surrounding and coaxial with the piston rod, said body having a polygonal cross section molded into fixed contact with the piston rod; and a plurality of blades (130) longitudinally disposed and extending from the body (128); each blade having a pair of longitudinal side walls (140), each of said longitudinal side walls having: a first flat surface (140a), which narrows from the first terminal end (123) of the blade face (122) at an angle (a'), measured between a line parallel to the longitudinal axis of the rod and the first flat surface; a second flat surface (140b) disposed adjacent the first flat surface; and a third planar surface (140c) disposed adjacent the second planar surface, said third planar surface (140c) narrowing from the second end end (125) of the blade face (122) at an angle (c'), measured between a line parallel to the longitudinal axis of the rod and the third flat surface (140c), each blade having an outer longitudinal edge (124), each of said blades having: a first blade face (122) disposed between a first end blade terminal (123) and the outer longitudinal edge (124); and a second blade face (122) disposed between a second end end (125) of the blade and the outer longitudinal edge (124) and a body area between the longitudinal side wall of a first blade and the longitudinal side wall. of an adjacent second lamina, defines a plurality of flat surfaces (132a, 132b, 132c).
    [0010]
    10. Rod guide (126) according to claim 9, characterized in that the angle (a') is equal to or less than 15 or 4 degrees, the second flat surface (140b) is generally perpendicular to the axis of the rod, and the angle (c') is equal to or less than 15 or 4 degrees.
    [0011]
    11. Rod guide (126) according to claim 9, characterized in that the second flat surface (140b) has a first longitudinal length (Lb') of at least twice the width of the second flat surface (140b ) predetermined, parallel to the axis of the rod, both the first flat surface (140a) and the third flat surface (140c) having a longitudinal length (La', Lc') greater than the longitudinal length (Lb') of the second flat surface .
    [0012]
    12. Rod guide (126) according to claim 11, characterized in that the longitudinal length of the first flat surface (140a) and the third flat surface (140c) is in the range of 55 to 75 mm, and the second flat surface (140b) has a longitudinal length in the range of 0 to 30 mm.
    [0013]
    13. Rod guide (126) according to claim 9, characterized in that the rod guide (126) further includes a first curved feed section (134), molded integral with the body (128), the said advancing section disposed longitudinally around the shank and ending at a first end, on an outer surface of the shank, and disposed at a second end, in integral contact with the body (128), said advancing section having a curved surface (135), with a radius of curvature in the range of 20 to 22 mm.
    [0014]
    14. Rod guide (126) according to claim 13, characterized in that the rod guide further includes a first curved advance section (134) molded integral with the body (128), said section of advance having an outer curved surface, which extends from the shaft to the body, said curved surface defined by a tangent with the intermediate point of the curved surface having an angle in the range of 5 to 20 degrees, measured between a line parallel to the longitudinal axis of the shank and tangent to the curved surface (135) of the feed section, said curved surface having a radius of curvature in the range of 20 to 22 mm.
    [0015]
    15. Stem guide (26, 126) according to claim 1 or 9, characterized in that the various blades include 4 blades, arranged circumferentially 90 degrees around the guide body (28, 128).
    [0016]
    16. Stem guide (126) according to claim 9, characterized in that the outer longitudinal edge (124) has a convex curved surface, with a radius of curvature equal to the radius of curvature of an inner surface of a tube (T), in which the rod and rod guide are to be used.
    [0017]
    17. Stem guide (126) according to claim 9, characterized in that the trough (132), between the longitudinal side walls, includes: a first flat surface (132a), which narrows from the first terminal end (123) of the blade face (122) at an angle (a1), measured between a line parallel to the longitudinal axis of the shank and the first flat surface (132a); a second flat surface (132b) disposed adjacent the first flat surface (132a); and a third planar surface (132c) disposed adjacent to the second planar surface (132b), said third planar surface (132c) narrowing from the second end end (125) of the blade face at an angle (c1) measured between a line parallel to the longitudinal axis of the rod and the third flat surface (132c).
    [0018]
    18. Rod guide according to (126) of claim 17, characterized in that the angle (a1) is equal to or less than 4 degrees, the second flat surface (132b) is generally parallel to the axis of the rod, and the angle (c1) is equal to or less than 4 degrees.
    [0019]
    19. Stem guide (126) according to claim 17, characterized in that the blade face (122) comprises a curved surface extending from the first end end (123) of the blade to the outer longitudinal edge (124), said curved surface defined by a tangent with the intermediate point of the curved surface having an angle in the range of 10 to 40 degrees, measured between a line parallel to the longitudinal axis of the rod and the tangent with the curved surface of the face of blade (122), and further comprising a curved surface, extending from the first end end (123) to the outer longitudinal edge (124).
    [0020]
    20. Rod guide (126) according to claim 17, characterized in that the second flat surface (132b) has a first longitudinal length (Lb) of at least twice the width of the second flat surface, parallel to the axis of the rod, both the first flat surface (132a) and the third flat surface (132c) having a longitudinal length (La, Lc) greater than the longitudinal length (Lb) of the second flat surface (132b).
    [0021]
    21. Rod guide (126) according to claim 17, characterized in that the longitudinal length of the first flat surface (132a) and the third flat surface (132c) is in the range of 55 to 75 mm, and the second flat surface (132b) has a longitudinal length in the range of 0 to 30 mm.
    [0022]
    22. Process of installing a rod guide (26) on a piston rod, characterized in that it comprises: molding a coaxial unitary rod guide around and in fixed contact with the piston rod, said guide comprising a body portion (28) surrounding and coaxial with the piston rod, said body having a plurality of blades (30), longitudinally disposed and extending from the body (28), each blade having a pair of longitudinal side walls ( 40) and an outer longitudinal edge (24), all said blades having a first blade face (22) disposed between a first end end (23) of the blade and the outer longitudinal edge (24), and a second blade face (22) blade (22) disposed between a second end end (25) of the blade and the outer longitudinal edge (24), and an area of the body between the longitudinal side wall (40) of a first blade and the longitudinal side wall (40 ) of an adjacent second blade, defines a chute (32) having several s flat surfaces (32a, 32b, 32c).
    [0023]
    23. Process according to claim 22, characterized in that it further includes concurrent molding of a first advance section (34) integral with the body (28), said advance section disposed longitudinally around the rod and ending at a first end of an outer surface of the rod and disposed at a second end, in contact with the body (28), said advancing section having a curved surface (35) with a radius of curvature in the range of 20 to 22 mm, and said curved surface, further defined by a tangent with the intermediate point of the curved surface, having an angle in the range of 5 to 20 degrees, measured between a line parallel to the longitudinal axis of the rod and the tangent with the curved surface ( 35) of the advance section (34).
    [0024]
    24. Process according to claim 22, characterized in that the gutter (32), between the longitudinal side walls, includes: a first flat surface (32a), which narrows from the first terminal end (23) of the face blade (22) at an angle (a1), measured between a line parallel to the longitudinal axis of the rod and the first flat surface (a); a second flat surface (32b) disposed adjacent to the first flat surface (a); and a third planar surface (32c) disposed adjacent the second planar surface, said third planar surface narrowing from the second terminal end (25) of the blade face (22) at an angle (c1), measured between a parallel line. to the longitudinal axis of the rod and the third flat surface (32c).
    [0025]
    25. Process according to claim 22, characterized in that it further includes: preparing a section of the rod (10) by placing an epoxy-based glue on a predetermined part of the rod, and placing particles having a diameter in the range of 0.71 to 1.18 mm, in the epoxy glue; and direct injection molding the rod guides (26) around at least a portion of the prepared section of the rod.
    [0026]
    26. Process of installing a rod guide (126) on a piston rod, characterized in that it comprises: molding a coaxial unitary rod guide around, and in fixed contact with, the said piston rod. guide comprising a body portion (280) surrounding and coaxial with the piston rod, said body having a plurality of blades (30), longitudinally disposed and extending from the body (28), each blade having a pair of longitudinal side walls ( 140), each of said longitudinal side walls having a first flat surface (140a), which narrows from the first terminal end (123) of the blade face (122) at an angle (a') measured between a line parallel to the longitudinal axis of the rod and the first flat surface, a second flat surface (140b) disposed adjacent to the first flat surface, and a third flat surface (140c) disposed adjacent to the second flat surface, said third flat surface (140c) narrowing off the second ext end edge (125) of the blade face (122) at an angle (c') measured between a line parallel to the longitudinal axis of the shank and the third flat surface (140c), each blade having an outer longitudinal edge (124), each of said blades having a first blade face (122) disposed between a first end end (123) of the blade and the outer longitudinal edge (124), and a second blade face (122) disposed between a second end. The blade end (125) and the outer longitudinal edge (124), and an area of the body between the longitudinal side wall of a first blade and the longitudinal side wall of an adjacent second blade defines a chute (132) having a plurality of surfaces flats (132a, 132b, 132c).
    [0027]
    27. Process according to claim 26, characterized in that it further includes concurrently molding a first curved advance section (34), integral with the body (28), said advance section disposed longitudinally around the rod and ending at a first end of an outer surface of the rod and disposed at a second end, in contact with the body (28), said advancing section having a curved surface (35) with a radius of curvature in the range of 20 to 22 mm, and said curved surface is further defined by a tangent with the intermediate point of the curved surface having an angle in the range of 5 to 20 degrees, measured between a line parallel to the longitudinal axis of the rod and the tangent with the curved surface (35 ) of the advance section (34).
    [0028]
    28. Process according to claim 26, characterized in that the gutter (132), between the longitudinal side walls, includes: a first flat surface (132a), which narrows from the first terminal end (123) of the face blade (122) at an angle (a1), measured between a line parallel to the longitudinal axis of the rod and the first flat surface (132a); a second flat surface (132b) disposed adjacent the first flat surface (132a); and a third planar surface (132c) disposed adjacent the second planar surface (132b), said third planar surface (132c) narrowing from the second end end (125) of the blade face (122) at an angle (c1) , measured between a line parallel to the longitudinal axis of the rod and the third flat surface (132c).
    [0029]
    29. Process according to claim 26, characterized in that it further includes: preparing a section of the rod (10) by placing an epoxy-based glue on a predetermined part of the rod, and placing particles having a diameter in the range of 0.71 to 1.18 mm, in the epoxy glue; and direct injection molding the rod guides (26, 126) around at least a portion of the prepared section of the rod.
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    同族专利:
    公开号 | 公开日
    CA2792755A1|2013-04-25|
    PE20131001A1|2013-10-16|
    ECSP12012278A|2014-05-31|
    CO6930063A1|2014-04-28|
    US20130098601A1|2013-04-25|
    CA2792755C|2020-03-24|
    RO128519A2|2013-06-28|
    US20150252636A1|2015-09-10|
    AR088516A1|2014-06-18|
    US9010418B2|2015-04-21|
    US9926754B2|2018-03-27|
    MX2012012424A|2013-05-28|
    BR102012027414A2|2014-03-18|
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    法律状态:
    2014-03-18| B03A| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]|
    2017-01-31| B25A| Requested transfer of rights approved|Owner name: TENARIS CONNECTIONS B.V. (NL) |
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-10-01| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: E21B 17/10 , F04B 47/00 Ipc: E21B 17/10 (1968.09), E21B 19/22 (1980.01) |
    2019-10-08| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-11-03| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application [chapter 6.1 patent gazette]|
    2021-03-02| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-05-11| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 25/10/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/280,444|US9010418B2|2011-10-25|2011-10-25|Sucker rod guide|
    US13/280,444|2011-10-25|
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