Sucker rod anti-abrasion sleeve

Abstract

The utility model relates to the technical field of underground protectors, in particular to an anti-abrasion sleeve for a sucker rod, which is provided with a central hole for the sucker rod to penetrate through, an oil guide hole is arranged in the anti-abrasion sleeve, and the oil guide hole obliquely extends relative to the axis of the central hole or spirally extends around the axis of the central hole. The oil guide holes can drive the anti-abrasion sleeve to rotate to achieve even abrasion when oil flows through the oil guide holes, meanwhile, the oil guide channels are formed by the oil guide holes in the anti-abrasion sleeve, the oil guide channels can be prevented from occupying the outer surface of the anti-abrasion sleeve, the anti-abrasion area of the anti-abrasion sleeve is prevented from being affected, and the service life can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole protective gear, in particular to an anti-wear sleeve for a pumping rod. Background Art

[0002] Most of the oil wells in onshore oil fields are produced by using tubular oil pumps. The pump barrel of the oil pump is connected to the oil pipe, and the plunger of the oil pump is located in the pump barrel and connected to the sucker rod. The sucker rod is very long. The entire sucker rod is connected by a series of sucker rods, and the two adjacent sucker rods are connected by couplings. During the downstroke of the oil pump, the sucker rod above the plunger will bend and not be centered. The sucker rod will contact the wall of the oil pipe and generate friction. In order to avoid the bending of the sucker rod and the wear of the oil pipe, the current method is to install a wear preventer at the coupling of the two adjacent sucker rods, so that when the sucker rod moves up and down, the wear preventer contacts the wall of the oil pipe, thereby avoiding the friction between the sucker rod and the wall of the oil pipe. A Chinese utility model patent with the authorization announcement number CN203441394U and the authorization announcement date of February 19, 2014 discloses a rotatable sucker rod straightening anti-wear device, whose anti-wear body is a cylinder, which is the sucker rod anti-wear sleeve and is composed of an inner sleeve and an outer wear body. A plurality of oil guide grooves are arranged on the outer peripheral surface of the outer wear body, and the axis of the oil guide groove has an inclined angle with the axis of the cylinder of the anti-wear body. The outer peripheral surface of the outer wear body constitutes an anti-wear surface. The inclined oil guide grooves are used so that the oil flow can automatically push the anti-wear body to rotate, avoiding the friction part from being relatively fixed, which is conducive to improving the service life of the straightening anti-wear device. However, this rotatable anti-wear device still has limitations. Its oil guide grooves are arranged on the outer peripheral surface of the outer wear body, which reduces the area where the outer peripheral surface of the outer wear body can contact the inner wall of the oil pipe, thereby reducing the anti-wear area and affecting the service life. Utility Model Content

[0003] The utility model aims to provide a sucker rod anti-wear sleeve to solve the problem that the current sucker rod anti-wear sleeve has a small anti-wear area and its service life is affected.

[0004] The technical solution of the sucker rod anti-wear sleeve of the utility model is:

[0005] A sucker rod anti-wear sleeve has a central hole for the sucker rod to pass through, an oil guide hole is arranged in the anti-wear sleeve, the oil guide hole extends obliquely relative to the axis of the central hole or extends spirally around the axis of the central hole, and oil flows through the oil guide hole to drive the anti-wear sleeve to rotate.

[0006] Beneficial effects: By utilizing the oil guide hole that extends obliquely relative to the axis of the center hole or spirally extends around the axis of the center hole, the anti-wear sleeve can be driven to rotate when the oil flows through to achieve uniform wear. At the same time, the oil guide hole inside the anti-wear sleeve is used to form an oil guide channel, which can avoid the oil guide channel occupying the outer surface of the anti-wear sleeve and avoiding affecting the anti-wear area of ​​the anti-wear sleeve, which is beneficial to extending the service life.

[0007] Furthermore, the anti-wear sleeve comprises an inner sleeve body and an outer sleeve body which are separately arranged, the inner sleeve body is fixed on the inner wall of the outer sleeve body, and the oil guide hole is arranged on the inner sleeve body or the outer sleeve body.

[0008] Beneficial effects: The separated inner sleeve and outer sleeve can be made of different materials respectively, and the oil guide hole can be formed on the inner sleeve or the outer sleeve as needed, which is flexible and convenient.

[0009] Furthermore, one of the inner sleeve and the outer sleeve is provided with an anti-wear surface, and the other is provided with the oil guide hole.

[0010] Beneficial effect: The oil guide hole and the anti-wear surface are respectively arranged on the two sleeves, which facilitates the manufacture of the sleeves.

[0011] Furthermore, the thickness of the corresponding sleeve body provided with the oil guide hole is greater than the thickness of the corresponding sleeve body provided with the anti-wear surface.

[0012] Beneficial effect: It is convenient to arrange the oil guide hole in the corresponding sleeve body, and saves the material of the corresponding sleeve body provided with the anti-wear surface.

[0013] Furthermore, the inner wall surface of the inner sleeve body constitutes an anti-wear surface for contacting the sucker rod, and the anti-wear sleeve has a supporting portion, which is used to support on a supporting surface arranged on the inner wall of the oil pipe.

[0014] Beneficial effect: the anti-wear sleeve is supported by the support surface arranged on the inner wall of the oil pipe, thereby limiting the movement of the anti-wear sleeve. When the sucker rod moves downward, the sucker rod moves downward relative to the anti-wear sleeve, and the anti-wear sleeve does not move relative to the oil pipe. The anti-wear surface of the anti-wear sleeve has an anti-wear effect on the sucker rod; this facilitates the anti-wear setting of the set position of the oil pipe.

[0015] Furthermore, the lower end surface of the anti-wear sleeve is a plane and constitutes a supporting portion.

[0016] Beneficial effects: simple structure, easy to support and reliable.

[0017] Furthermore, the inner diameter of the inner sleeve is greater than the outer diameter of the sucker rod so that the inner sleeve is spaced apart from the sucker rod.

[0018] Beneficial effect: when the sucker rod moves upward, friction between the sucker rod and the anti-wear sleeve can be avoided.

[0019] Furthermore, the inner casing is bonded and fixed to the outer casing.

[0020] Beneficial effect: Adhesive bonding is adopted to ensure reliable fixation and facilitate the fixing operation.

[0021] Furthermore, there are more than two oil guide holes, and the oil guide holes are evenly distributed around the axis of the central hole.

[0022] Beneficial effect: increasing the flow area is conducive to the rotation of the anti-wear sleeve.

[0023] Furthermore, the oil guide hole has an oil inlet opening and an oil outlet opening respectively located on both axial end surfaces of the anti-wear sleeve.

[0024] Beneficial effect: It avoids affecting the area of ​​the anti-wear surface of the anti-wear sleeve and facilitates the formation of the oil guide hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the installation structure of the connecting pipe and the anti-wear sleeve of the embodiment 1 of the sucker rod anti-wear sleeve of the utility model;

[0026] Figure 2 for Figure 1 Schematic diagram of the use status of the anti-wear sleeve;

[0027] Figure 3 for Figure 1 A schematic diagram of the structure of the anti-wear sleeve;

[0028] Figure 4 for Figure 1 A front view of the wear sleeve in FIG.

[0029] Figure 5 for Figure 1 A top view of the wear sleeve in FIG.

[0030] Figure 6 for Figure 4 AA section diagram of the wear sleeve.

[0031] In the figure: 1. connecting pipe; 11. oil pipe connector; 12. pump barrel connector; 2. outer casing; 21. oil guide hole; 3. inner casing; 4. oil pipe body; 5. coupling; 6. sucker rod; 7. plunger; 8. pump barrel; 9. sealing ring. DETAILED DESCRIPTION

[0032] Embodiment 1 of the pumping rod anti-wear sleeve of the utility model:

[0033] In this embodiment, the oil guide holes spirally extending around the axis of the center hole can drive the anti-wear sleeve to rotate when the oil flows through to achieve uniform wear. At the same time, the oil guide holes inside the anti-wear sleeve are used to form an oil guide channel, which can avoid the oil guide channel occupying the outer surface of the anti-wear sleeve and avoiding affecting the anti-wear area of ​​the anti-wear sleeve, which is beneficial to extending the service life.

[0034] Specifically, Figure 1-6As shown, the sucker rod anti-wear sleeve comprises an inner sleeve body 3 and an outer sleeve body 2 which are separately arranged. The inner sleeve body 3 is fixed on the inner wall of the outer sleeve body 2. The inner sleeve body 3 is an ultra-high molecular polyethylene inner liner tube, and its outer wall is bonded to the outer sleeve body 2. Its inner hole constitutes the center hole of the anti-wear sleeve for the sucker rod 6 to pass through, and the axis of the center hole is the center axis of the anti-wear sleeve. The inner hole wall surface of the inner sleeve body 3 constitutes the anti-wear surface of the anti-wear sleeve for frictional contact with the sucker rod. The anti-wear sleeve can move up and down relative to the sucker rod and prevent the sucker rod 6 from wearing the oil pipe.

[0035] The outer sleeve body 2 of the anti-wear sleeve is provided with an oil guide hole 21 which spirally extends around the central axis of the anti-wear sleeve. The oil guide hole 21 is a hole which spirally extends from bottom to top and is formed inside the outer sleeve body 2. The oil guide hole 21 can be cast. There are six oil guide holes 21, and each oil guide hole 21 is evenly distributed around the axis of the central hole. Each oil guide hole 21 has an oil inlet opening and an oil outlet opening which are arranged opposite to each other in the axial direction of the anti-wear sleeve. The oil inlet opening is located on the lower end face of the outer sleeve body 2, and the oil outlet opening is located on the upper end face of the outer sleeve body 2, so that oil flows through the oil guide hole 21 to drive the anti-wear sleeve to rotate, thereby achieving uniform wear, and does not reduce the area of ​​the anti-wear surface arranged on the inner sleeve body 3, thereby extending the service life.

[0036] The inner sleeve 3 is consistent with the outer sleeve 2 in axial length, the outer sleeve 2 is thicker than the inner sleeve 3, and the thickness direction is consistent with the radial direction of the sleeve, so that the inner sleeve 3 is thinner, saving materials and reducing replacement costs.

[0037] An upward step surface is provided on the inner wall of the oil pipe, and the upward step surface constitutes a support surface. The lower end surface of the outer sleeve 2 of the anti-wear sleeve is a plane and constitutes a support portion, and the support portion is used to support the support surface set on the inner wall of the oil pipe. The anti-wear sleeve is supported by the support surface set on the inner wall of the oil pipe, thereby limiting the downward movement of the anti-wear sleeve. When the sucker rod 6 moves downward, the sucker rod moves downward relative to the anti-wear sleeve, and the anti-wear sleeve does not move relative to the oil pipe. When the sucker rod 6 bends and contacts the inner wall of the inner sleeve 3, the anti-wear surface of the anti-wear sleeve plays an anti-wear role on the sucker rod; this facilitates the anti-wear setting of the set position of the oil pipe. The inner diameter of the inner sleeve 3 meets the requirement of being larger than the outer diameter of the sucker rod, so that friction between the sucker rod and the anti-wear sleeve can be avoided when the sucker rod moves upward.

[0038] The oil pipe includes an oil pipe body 4 and a connecting pipe 1 connected to the lower end of the oil pipe body 4. The anti-wear sleeve is arranged in the connecting pipe 1. The connecting pipe 1 includes a separately arranged oil pipe connector 11 and a pump barrel connector 12. The lower end of the pump barrel connector 12 is fixedly connected to the upper end of the pump barrel 8. The connecting pipe 1 is connected between the oil pipe body 4 and the pump barrel 8 of the oil pump. The lower end of the sucker rod 6 passes through the anti-wear sleeve in the connecting pipe 1 and is connected to the upper end of the plunger 7 of the oil pump. The sucker rod is located in the oil pipe, and the anti-wear sleeve can play a role in straightening and anti-wearing the sucker rod at a position of the oil pipe close to the pump barrel 8.

[0039] The upper end of the pump barrel connector 12 is threadedly connected to the lower end of the oil pipe connector 11 and a sealing ring 9 is provided at the connection. The inner hole of the pump barrel connector 12 has a stepped hole section, which includes a large hole section at the top and a small hole section at the bottom. The junction of the large hole section and the small hole section forms an upward step surface to support the anti-wear sleeve.

[0040] The inner diameter of the center hole of the wear sleeve is smaller than the inner diameter of the pump barrel 8, the inner diameter of the center hole of the wear sleeve is smaller than the outer diameter of the coupling 5 on the sucker rod, and the inner diameter of the connecting pipe 1 is larger than the outer diameter of the coupling 5. The outer diameter of the wear sleeve is smaller than the inner diameter of the oil pipe body 4. The minimum inner diameter of the connecting pipe 1 is larger than the outer diameter of the plunger 7, so that the plunger 7 can pass through the connecting pipe 1 and go down into the pump barrel 8. Figure 2 It is used to illustrate the relative relationship of various components and does not represent the actual scale.

[0041] When in use, after the connecting pipe 1 is connected between the oil pipe and the pump barrel 8 and then lowered into the well to a set depth, the anti-wear sleeve is slidably sleeved on the sucker rod on the upper part of the plunger 7, and the sucker rod lowers the plunger 7 and the anti-wear sleeve into the well, the plunger 7 enters the pump barrel 8, and the anti-wear sleeve sits on the upward step surface on the inner wall of the connecting pipe 1. When the plunger 7 moves up and down to pump oil, the sucker rod rubs against the anti-wear sleeve after bending downward to prevent the sucker rod from wearing the oil pipe. A part of the output fluid extracted by the oil pump is discharged through the annular space between the sucker rod and the inner sleeve body 3, and the other part is discharged through the oil guide hole 21 of the anti-wear sleeve spirally rising, and the anti-wear sleeve is driven to rotate, so that the inner sleeve body 3 is evenly worn, and the entire inner wall surface of the inner sleeve body 3 can be rubbed to extend the service life; when checking the pump, the sucker rod is lifted, and the plunger 7 drives the anti-wear sleeve to be lifted out together.

[0042] Embodiment 2 of the sucker rod anti-wear sleeve in the utility model:

[0043] This embodiment provides a different arrangement of the anti-wear sleeve from that of the first embodiment. The difference between this embodiment and the first embodiment is that the anti-wear sleeve in the first embodiment includes an inner sleeve body and an outer sleeve body which are separately arranged. In this embodiment, the anti-wear sleeve is an integrally formed structure.

[0044] Embodiment 3 of the sucker rod anti-wear sleeve in the utility model:

[0045] This embodiment provides a different inner sleeve arrangement from that of the first embodiment. The difference between this embodiment and the first embodiment is that the inner sleeve in the first embodiment is provided with a wear-resistant surface and the outer sleeve is provided with an oil guide hole. In this embodiment, the wear-resistant surface and the oil guide hole are both provided on the inner sleeve, and the thickness of the inner sleeve is relatively thick.

[0046] Embodiment 4 of the sucker rod anti-wear sleeve in the utility model:

[0047] This embodiment provides a different inner sleeve arrangement from that of embodiment 1, and the difference between this embodiment and embodiment 1 is that the thickness of the inner sleeve in embodiment 1 is less than that of the outer sleeve. In this embodiment, the thickness of the inner sleeve is greater than that of the outer sleeve.

[0048] Embodiment 5 of the sucker rod anti-wear sleeve in the utility model:

[0049] This embodiment provides a different arrangement of the anti-wear sleeve from that of the first embodiment. The difference between this embodiment and the first embodiment is that the inner wall surface of the inner sleeve in the first embodiment constitutes an anti-wear surface for contacting the sucker rod, and the support portion of the anti-wear sleeve is used to support the support surface provided on the inner wall of the oil pipe. In this embodiment, the outer peripheral surface of the outer sleeve constitutes an anti-wear surface, and the support portion of the anti-wear sleeve is used to support the positioning sleeve provided on the sucker rod.

[0050] Embodiment 6 of the sucker rod anti-wear sleeve in the utility model:

[0051] This embodiment provides a different support portion arrangement form from that of Embodiment 1, and the difference between this embodiment and Embodiment 1 is that the lower end surface of the anti-wear sleeve in Embodiment 1 is a plane and constitutes the support portion. In this embodiment, the lower end surface of the anti-wear sleeve is a conical surface and constitutes the support portion.

[0052] Embodiment 7 of the sucker rod anti-wear sleeve in the utility model:

[0053] This embodiment provides a different inner sleeve arrangement from that of embodiment 1. The difference between this embodiment and embodiment 1 is that the inner diameter of the inner sleeve in embodiment 1 is greater than the outer diameter of the sucker rod. In this embodiment, the inner sleeve is tightly attached to the sucker rod.

[0054] Embodiment 8 of the sucker rod anti-wear sleeve in the utility model:

[0055] This embodiment provides a different arrangement of the anti-wear sleeve from that of the first embodiment. The difference between this embodiment and the first embodiment is that the inner sleeve and the outer sleeve are fixed by bonding in the first embodiment. In this embodiment, the inner sleeve and the outer sleeve are fixed by interference fit.

[0056] Embodiment 9 of the sucker rod anti-wear sleeve in the utility model:

[0057] This embodiment provides a different arrangement of the oil guide holes from that of the first embodiment. The difference between this embodiment and the first embodiment is that in the first embodiment, more than two oil guide holes are provided. In this embodiment, only one oil guide hole is provided.

[0058] Embodiment 10 of the sucker rod anti-wear sleeve in the utility model:

[0059] This embodiment provides a different arrangement of the oil guide holes from that of the embodiment 1. The difference between this embodiment and the embodiment 1 is that the oil guide holes in the embodiment 1 have an oil inlet opening and an oil outlet opening respectively located on both axial end surfaces of the anti-wear sleeve. In this embodiment, the oil inlet opening of the oil guide hole is arranged at a position close to the lower edge of the outer peripheral surface of the outer casing, and the oil outlet opening of the oil guide hole is arranged at a position close to the upper edge of the outer peripheral surface of the outer casing.

[0060] Embodiment 11 of the sucker rod anti-wear sleeve in the utility model:

[0061] This embodiment provides a different arrangement of the oil guide holes from that of the first embodiment. The difference between this embodiment and the first embodiment is that the oil guide holes in the first embodiment extend spirally around the axis of the center hole. In this embodiment, the oil guide holes extend obliquely relative to the axis of the center hole, which facilitates the processing and forming of the oil guide holes by drilling.

[0062] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sucker rod wear sleeve having a central hole for the sucker rod to pass through, characterized in that: An oil guide hole is arranged in the anti-wear sleeve, and the oil guide hole extends obliquely relative to the axis of the central hole or extends spirally around the axis of the central hole. The oil guide hole allows oil to flow through to drive the anti-wear sleeve to rotate.

2. The sucker rod anti-wear sleeve according to claim 1, characterized in that: The anti-wear sleeve comprises an inner sleeve body and an outer sleeve body which are separately arranged. The inner sleeve body is fixed on the inner wall of the outer sleeve body, and the oil guide hole is arranged on the inner sleeve body or the outer sleeve body.

3. The sucker rod anti-wear sleeve according to claim 2, characterized in that: One of the inner sleeve body and the outer sleeve body is provided with an anti-wear surface, and the other is provided with the oil guide hole.

4. The sucker rod anti-wear sleeve according to claim 3 is characterized in that: The thickness of the corresponding sleeve body provided with the oil guide hole is greater than the thickness of the corresponding sleeve body provided with the anti-wear surface.

5. The sucker rod anti-wear sleeve according to claim 2, 3 or 4, characterized in that: The inner wall surface of the inner sleeve body constitutes an anti-wear surface for contacting the sucker rod. The anti-wear sleeve has a supporting portion, and the supporting portion is used to support on a supporting surface arranged on the inner wall of the oil pipe.

6. The sucker rod anti-wear sleeve according to claim 5, characterized in that: The lower end surface of the anti-wear sleeve is a plane and forms a supporting portion.

7. The sucker rod anti-wear sleeve according to claim 5, characterized in that: The inner diameter of the inner sleeve is greater than the outer diameter of the sucker rod so that the inner sleeve is spaced apart from the sucker rod.

8. The sucker rod anti-wear sleeve according to claim 2, 3 or 4, characterized in that: The inner sleeve body and the outer sleeve body are bonded and fixed.

9. The sucker rod anti-wear sleeve according to claim 1, 2, 3 or 4, characterized in that: There are more than two oil guide holes, and the oil guide holes are evenly distributed around the axis of the central hole.

10. The sucker rod anti-wear sleeve according to claim 1, 2, 3 or 4, characterized in that: The oil guide hole comprises an oil inlet opening and an oil outlet opening which are respectively located on the axial end surfaces of the anti-wear sleeve.

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