Sleeve anti-abrasion joint

Abstract

The utility model discloses an anti-abrasion joint for a casing pipe, and belongs to the technical field of petroleum drilling and production tool equipment. The casing abrasion-resistant connector comprises a connecting sleeve used for being connected with a drill rod, a macromolecule abrasion-resistant sleeve is installed on the connecting sleeve, a plurality of protruding stripes are annularly distributed on the peripheral face of the macromolecule abrasion-resistant sleeve, the stripes can be left-hand spiral stripes or right-hand spiral stripes or straight stripes, and the macromolecule abrasion-resistant sleeve can be made of macromolecule materials such as nylon and polyurethane. According to the utility model, the wear-resistant joint of the casing pipe is improved, so that the wear between the drill rod and the casing pipe can be reduced; the wear-resistant performance is improved by the macromolecular wear-resistant sleeve arranged on the wear-resistant joint of the sleeve, so that the damage to the sleeve can be reduced; the high-molecular wear-resistant sleeve is supported by high-molecular materials such as nylon and polyurethane, so that the high-molecular wear-resistant sleeve is wear-resistant, saline-alkaline-resistant and high-temperature-resistant and has relatively high toughness.

Description

Technical Field

[0001] The utility model relates to the technical field of oil drilling and production tool equipment, and particularly relates to a casing anti-wear joint. Background Technique

[0002] With the continuous development of the oil industry, the exploration and development of deep wells, directional wells and extended reach wells are increasing day by day. In complex drilling operations, long-term drilling and frequent tripping will cause the drill pipe to be subjected to lateral forces from the casing, which will cause wear to the drill pipe and the casing. To solve this problem, a casing anti-wear joint has been invented, which can be connected to the drill pipe, aiming to reduce the wear between the drill pipe and the casing and extend the service life of the drill string.

[0003] In the prior art, the casing anti-wear joint mostly adopts the method of installing wear-resistant alloy inserts on its outer peripheral surface to solve the problem of drill pipe wear. However, this solution still has certain limitations: if the material of the wear-resistant alloy insert is too soft, although it can reduce the direct wear on the casing, it is also easy to be quickly worn out or even fall off, which may lead to safety accidents such as part dropping and sticking of the drill string. On the contrary, if the material of the wear-resistant alloy insert is too hard, it may aggravate the damage to the casing while protecting the drill pipe, weaken the wall thickness of the casing, and the casing is easy to rupture, resulting in the abnormal operation of the oil well and great difficulty in repair.

[0004] In view of the above deficiencies, we have improved the casing anti-wear joint. The improved casing anti-wear joint can reduce the wear between the drill pipe and the casing and can avoid damaging the casing. Summary of the Invention

[0005] The purpose of the utility model is to provide a casing anti-wear joint for the above problems. This casing anti-wear joint can reduce the wear between the drill pipe and the casing and can avoid damaging the casing.

[0006] To achieve the above purpose, the utility model discloses a casing anti-wear joint, which includes a connecting sleeve for connecting the drill pipe. A polymer wear-resistant sleeve is installed on the connecting sleeve, and a plurality of raised stripes are annularly distributed on the outer peripheral surface of the polymer wear-resistant sleeve. The connecting sleeve can connect the drill pipe. When the drill pipe rotates, the polymer wear-resistant sleeve contacts the casing in the wellbore instead of the drill pipe contacting the casing. The polymer wear-resistant sleeve has wear-resistant performance, so the wear between the drill pipe and the casing can be reduced; the hardness of the polymer wear-resistant sleeve is less than that of the casing, so damage to the casing can be avoided; the stripes annularly distributed on the outer peripheral surface of the polymer wear-resistant sleeve are used to reduce the friction between the casing anti-wear joint and the casing, and the gaps between the stripes can pass through the drilling fluid, which has a lubricating effect.

[0007] The stripes are left-handed spiral stripes, right-handed spiral stripes or straight stripes. The left-handed spiral stripes or right-handed spiral stripes can adapt to the rotation direction of the drill pipe and are beneficial to increasing the strength. The straight stripes have a simple structure and good drilling fluid permeability.

[0008] The outer diameter of the polymer wear-resistant sleeve is 6-10 mm larger than that of the connecting sleeve. With this range of outer diameter difference between the polymer wear-resistant sleeve and the connecting sleeve, a certain safety distance is maintained between the connecting sleeve and the casing, preventing the connecting sleeve from contacting the casing.

[0009] One end of the connecting sleeve is provided with an internal connecting thread, and the other end is provided with an external connecting thread. The internal connecting thread and the external connecting thread are used to connect the drill pipe. Thread connection is adopted, which is relatively convenient for assembly.

[0010] The polymer wear-resistant sleeve is made of nylon or polyurethane material. The polymer wear-resistant sleeve made of nylon or polyurethane can be wear-resistant, resistant to salt and alkali, high-temperature resistant, and has high toughness.

[0011] An annular groove is provided in the middle of the connecting sleeve. The polymer wear-resistant sleeve is located in the annular groove, and the outer diameter of the polymer wear-resistant sleeve is larger than that of the connecting sleeve. The annular groove is used to limit the axial movement of the polymer wear-resistant sleeve, and the polymer wear-resistant sleeve can rotate relative to the connecting sleeve, which is beneficial to further reducing wear.

[0012] Retaining rings are sleeved on the parts of the annular groove located in front of and behind the polymer wear-resistant sleeve. The retaining rings are on both sides of the polymer wear-resistant sleeve, which play a limiting role and enable the polymer wear-resistant sleeve to rotate smoothly.

[0013] The intersections of the front and rear end faces of the retaining ring with its inner peripheral surface are all rounded corners, and the intersections of the front and rear end faces of the retaining ring with its outer peripheral surface are all chamfered corners. The rounded corners and chamfered corners on the retaining ring can reduce the friction between the retaining ring and other components.

[0014] The connecting sleeve includes a first sleeve and a second sleeve. The first sleeve includes a front barrel section and a rear barrel section that are connected. The outer diameter of the front barrel section is smaller than that of the rear barrel section. An external thread is provided at the front end of the front barrel section, and an internal thread is provided at the rear end of the second sleeve. The external thread at the front end of the front barrel section is matched with the internal thread at the rear end of the second sleeve. The outer peripheral surface of the front barrel section, the front end face of the rear barrel section, and the rear end face of the second sleeve jointly form the annular groove. This structure facilitates the installation and replacement of the polymer wear-resistant sleeve.

[0015] The front and rear end faces of the polymer wear-resistant sleeve are both provided with annular slots. The end faces of the two retaining rings close to the polymer wear-resistant sleeve are both provided with convex rings. The outer diameter of the convex ring is smaller than the maximum outer diameter of the retaining ring. The convex rings on the two retaining rings are respectively inserted into the two different annular slots on the polymer wear-resistant sleeve. The end face of the convex ring is annularly distributed with a plurality of arc-shaped grooves, and ball bearings are installed in the arc-shaped grooves; on the side of the rear retaining ring away from the polymer wear-resistant sleeve, a plurality of sliding blocks are annularly distributed, and a plurality of sliding grooves are correspondingly arranged on the front end face of the rear barrel section. The sliding blocks are inserted into the corresponding sliding grooves. A blind hole is provided at the position between the sliding blocks on the retaining ring, and a spring is installed in the blind hole. The two ends of the spring respectively abut against the bottom of the blind hole and the front end face of the rear barrel section. The ball bearings reduce the friction between the retaining ring and the polymer wear-resistant sleeve, enabling the polymer wear-resistant sleeve to rotate more smoothly, further reducing the resistance to the drill pipe, and reducing the wear between the polymer wear-resistant sleeve and the casing, as well as between the polymer wear-resistant sleeve and the connecting sleeve. The arc-shaped grooves on the convex ring are used to separate the ball bearings. The spring is used to keep the retaining ring pressed against the polymer wear-resistant sleeve to ensure the normal operation of the ball bearings. The cooperation between the sliding blocks and the sliding grooves is used to prevent the rear retaining ring from rotating relative to the first sleeve, avoiding damage to the spring due to the rotation of the two.

[0016] In summary, the beneficial effects of the present utility model are as follows: By improving the anti-wear joint of the casing, the present utility model can reduce the wear between the drill pipe and the casing; the polymer wear-resistant sleeve equipped on the anti-wear joint of the casing improves the wear-resistant performance and can reduce the damage to the casing; the polymer wear-resistant sleeve is supported by polymer materials such as nylon and polyurethane, which can be wear-resistant, resistant to salt and alkali, high-temperature resistant, and has high toughness. Brief Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the first embodiment of the present utility model;

[0018] Figure 2 is Figure 1 the three-dimensional assembly diagram of the shown embodiment;

[0019] Figure 3 is Figure 1 the sectional view of the shown embodiment;

[0020] Figure 4 is Figure 3 the enlarged view of part A in

[0021] Figure 5 is a schematic structural diagram of the polymer wear-resistant sleeve in some other embodiments of the present utility model;

[0022] Figure 6 is a schematic structural diagram of the polymer wear-resistant sleeve in still some other embodiments of the present utility model;

[0023] Figure 7It is a schematic structural diagram of the second embodiment of the present utility model;

[0024] Figure 8 is Figure 7 the three-dimensional assembly diagram of the illustrated embodiment;

[0025] Figure 9 is Figure 7 the sectional view of the illustrated embodiment;

[0026] Figure 10 is Figure 9 the schematic structural diagram after sectioning along the B-B line in

[0027] Figure 11 is Figure 9 the enlarged view of part C in

[0028] Figure 12 is Figure 10 the enlarged view of part D in

[0029] Figure 13 is Figure 8 the schematic diagram of a retaining ring and related components located at the rear in the illustrated embodiment.

[0030] In the figure: 1. Connecting sleeve, 2. High molecular wear-resistant sleeve, 3. Stripes, 4. Inner connecting thread, 5. Outer connecting thread, 6. Annular groove, 7. Retaining ring, 8. Fillet, 9. Chamfer, 10. First sleeve, 11. Second sleeve, 12. Front barrel section, 13. Rear barrel section, 14. Annular slot, 15. Convex ring, 16. Arc-shaped groove, 17. Ball, 18. Slide block, 19. Slide groove, 20. Blind hole, 21. Spring. Detailed implementation manners

[0031] The following combines the accompanying drawings and embodiments to further describe in detail the detailed implementation manners of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0032] Figures 1 to 4 Schematically shows the structure of the first embodiment of the present utility model.

[0033] Refer to Figures 1 to 3, in the first embodiment of the present utility model, the casing anti-wear joint includes a connecting sleeve 1 for connecting drill pipes, and a polymer wear-resistant sleeve 2 is installed on the connecting sleeve 1. A plurality of raised stripes 3 are circumferentially distributed on the outer peripheral surface of the polymer wear-resistant sleeve 2. The polymer wear-resistant sleeve 2 can be made of nylon, polyurethane or other polymer materials. The polymer wear-resistant sleeve 2 can be fixedly or rotatably installed on the connecting sleeve 1, and the outer diameter of the polymer wear-resistant sleeve 2 is greater than the outer diameter of the connecting sleeve 1. The outer diameter of the polymer wear-resistant sleeve 2 mentioned here refers to the maximum diameter of all components including the stripes 3 when viewed from the cross-section of the polymer wear-resistant sleeve 2, and the outer diameter of the connecting sleeve 1 refers to its maximum outer diameter. Generally, it is optimal that the outer diameter of the polymer wear-resistant sleeve 2 is 6 - 10 mm larger than the outer diameter of the connecting sleeve 1.

[0034] Referring to Figure 2 , in the first embodiment of the present utility model, the stripes 3 on the polymer wear-resistant sleeve 2 are left-handed helical stripes 3. Referring to Figure 5 , in some other embodiments of the present utility model, the stripes 3 on the polymer wear-resistant sleeve 2 are straight stripes 3. Referring to Figure 6 , in some other embodiments of the present utility model, the stripes 3 on the polymer wear-resistant sleeve 2 are right-handed helical stripes 3.

[0035] Referring to Figure 3 , Figure 4 , in the first embodiment of the present utility model, one end of the connecting sleeve 1 is provided with an internal connecting thread 4, and the other end is provided with an external connecting thread 5. An annular groove 6 is provided in the middle of the connecting sleeve 1, and the polymer wear-resistant sleeve 2 is located in the annular groove 6.

[0036] Referring to Figure 3 , Figure 4 , in the first embodiment of the present utility model, retaining rings 7 are sleeved on the parts in front of and behind the polymer wear-resistant sleeve 2 in the annular groove 6. The intersections of the front and rear end faces of the retaining ring 7 with its inner peripheral surface are all rounded corners 8, and the intersections of the front and rear end faces of the retaining ring 7 with its outer peripheral surface are all chamfers 9.

[0037] Referring to Figure 3 , Figure 4 , in the first embodiment of the present utility model, the connecting sleeve 1 includes a first sleeve 10 and a second sleeve 11. The first sleeve 10 includes a front barrel section 12 and a rear barrel section 13 which are connected. The outer diameter of the front barrel section 12 is smaller than the outer diameter of the rear barrel section 13. The front end of the front barrel section 12 is provided with an external thread, and the rear end of the second sleeve 11 is provided with an internal thread. The external thread at the front end of the front barrel section 12 cooperates with the internal thread at the rear end of the second sleeve 11. The outer peripheral surface of the front barrel section 12, the front end face of the rear barrel section 13, and the rear end face of the second sleeve 11 together form the annular groove 6.

[0038] After the casing anti-wear joint adopts the above structure, the internal connection thread 4 and the external connection thread 5 are used to connect with the drill pipe, and the inner cavity of the connection sleeve 1 can allow the drilling fluid to flow through. During the rotation of the drill pipe, the polymer wear-resistant sleeve 2 can rotate relative to the connection sleeve 1, reducing the resistance to the drill pipe. The polymer wear-resistant sleeve 2 can reduce the wear of the drill pipe and the casing, and avoid damaging the casing. The polymer wear-resistant sleeve 2 made of polymer materials such as nylon and polyurethane can be wear-resistant, resistant to saline-alkali, and high-temperature resistant, and has high toughness. A plurality of raised stripes are circumferentially distributed on the outer peripheral surface of the polymer wear-resistant sleeve, which can reduce the friction between the casing anti-wear joint and the casing, and the gaps between the stripes can allow the drilling fluid to pass through, playing a lubricating role. The retaining rings 7 are on both sides of the polymer wear-resistant sleeve 2. While playing a limiting role, the polymer wear-resistant sleeve can rotate smoothly. The rounded corners 8 and chamfers 9 on the retaining rings 7 can reduce the friction between the retaining rings 7 and other components.

[0039] Figures 7 to 13 Fig. shows the structure of the second embodiment of the present invention, which is a further improvement on the basis of the first embodiment.

[0040] Refer to Figures 7 to 10 , in the second embodiment of the present invention, the casing anti-wear joint includes a connection sleeve 1 for connecting the drill pipe. A polymer wear-resistant sleeve 2 is installed on the connection sleeve 1, and a plurality of raised stripes 3 are circumferentially distributed on the outer peripheral surface of the polymer wear-resistant sleeve 2. An annular groove 6 is provided in the middle of the connection sleeve 1, and the polymer wear-resistant sleeve 2 is located in the annular groove 6. Retaining rings 7 are sleeved on the parts in front of and behind the polymer wear-resistant sleeve 2 in the annular groove 6. The connection sleeve 1 includes a first sleeve 10 and a second sleeve 11. The first sleeve 10 includes a front barrel section 12 and a rear barrel section 13 connected to each other. The outer diameter of the front barrel section 12 is smaller than that of the rear barrel section 13. An external thread is provided at the front end of the front barrel section 12. An internal thread is provided at the rear end of the second sleeve 11. The external thread at the front end of the front barrel section 12 is matched with the internal thread at the rear end of the second sleeve 11. The outer peripheral surface of the front barrel section 12, the front end surface of the rear barrel section 13, and the rear end surface of the second sleeve 11 together form the annular groove 6.

[0041] Refer to Figure 7 , Figure 8 , Figure 10 , Figure 12 , Figure 13 , in the second embodiment of the present invention, annular slots 14 are provided on both the front end surface and the rear end surface of the polymer wear-resistant sleeve 2. Convex rings 15 are provided on the end surfaces of the two retaining rings 7 close to the polymer wear-resistant sleeve 2. The outer diameter of the convex ring 15 is smaller than the maximum outer diameter of the retaining ring 7. The convex rings 15 on the two retaining rings 7 are respectively inserted into the two different annular slots 14 on the polymer wear-resistant sleeve 2. A plurality of arc-shaped grooves 16 are circumferentially distributed on the end surface of the convex ring 15, and balls 17 are installed in the arc-shaped grooves 16.

[0042] Reference Figure 7 、 Figure 8 、 Figure 9 、 Figure 11 、 Figure 13 In the second embodiment of the present utility model, a plurality of sliders 18 are circumferentially arranged on the side of the rear retaining ring 7 away from the polymer wear-resistant sleeve 2. A plurality of chutes 19 are correspondingly arranged on the front end face of the rear barrel section 13. The sliders 18 are inserted into the corresponding chutes 19. Blind holes 20 are provided at the positions between the sliders 18 on the retaining ring 7. Springs 21 are installed in the blind holes 20. The two ends of the springs 21 respectively abut against the bottom of the blind holes 20 and the front end face of the rear barrel section 13.

[0043] After further improving the casing anti-wear joint, the balls 17 between the retaining ring 7 and the polymer wear-resistant sleeve 2 can further reduce the friction between the retaining ring 7 and the polymer wear-resistant sleeve 2, enabling the polymer wear-resistant sleeve 2 to rotate smoothly, thereby reducing the resistance to the drill pipe and the wear of the polymer wear-resistant sleeve 2. A plurality of arc-shaped grooves 16 are provided on the end face of the convex ring 15 for separating different balls 17. The springs 21 are used to keep a certain pressing degree between the retaining ring 7 and the polymer wear-resistant sleeve 2, so that the balls 17 are in a normal working state. The cooperation of the sliders 18 and the chutes 19 is used to prevent the retaining ring 7 and the first sleeve 10 from rotating relative to each other, avoiding damage to the springs 21 due to their rotation.

[0044] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "front", "rear", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0045] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0046] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and substitutions can still be made, and these improvements and substitutions should also be regarded as the protection scope of the present utility model.

Claims

1. A casing anti-wear joint, comprising a connecting sleeve (1) for connecting a drill pipe, characterized in that A polymer wear-resistant sleeve (2) is installed on the connecting sleeve (1), and a plurality of raised stripes (3) are arranged around the outer circumference of the polymer wear-resistant sleeve (2).

2. The casing anti-wear joint according to claim 1, characterized in that: The stripes (3) are left-handed spiral stripes (3), right-handed spiral stripes (3) or straight stripes (3).

3. The casing anti-wear joint according to claim 1, characterized in that: The outer diameter of the polymer wear-resistant sleeve (2) is 6-10 mm larger than the outer diameter of the connecting sleeve (1).

4. The casing anti-wear joint according to claim 1, characterized in that: One end of the connecting sleeve (1) is provided with an internal connecting thread (4), and the other end is provided with an external connecting thread (5).

5. The casing anti-wear joint according to claim 1, characterized in that: The polymer wear-resistant sleeve (2) is made of nylon or polyurethane material.

6. The casing anti-wear joint according to any one of claims 1 to 5, characterized in that: An annular groove (6) is provided in the middle of the connecting sleeve (1), and the polymer wear-resistant sleeve (2) is located in the annular groove (6).

7. The casing anti-wear joint according to claim 6, characterized in that: The annular groove (6) is provided with retaining rings (7) at the front and rear sides of the polymer wear-resistant sleeve (2).

8. The casing anti-wear joint according to claim 7, characterized in that: The intersections of the front and rear end surfaces of the retaining ring (7) with its inner circumference are both rounded (8), and the intersections of the front and rear end surfaces of the retaining ring (7) with its outer circumference are both chamfered (9).

9. The casing anti-wear joint according to claim 6, characterized in that: The connecting sleeve (1) comprises a first sleeve (10) and a second sleeve (11); the first sleeve (10) comprises a front sleeve section (12) and a rear sleeve section (13) connected to each other; the outer diameter of the front sleeve section (12) is smaller than the outer diameter of the rear sleeve section (13); the front end of the front sleeve section (12) is provided with an external thread; the rear end of the second sleeve (11) is provided with an internal thread; the external thread at the front end of the front sleeve section (12) cooperates with the internal thread at the rear end of the second sleeve (11); the outer peripheral surface of the front sleeve section (12), the front end surface of the rear sleeve section (13), and the rear end surface of the second sleeve (11) jointly form the annular groove (6).

10. The casing anti-wear joint according to claim 9, characterized in that: The front and rear surfaces of the polymer wear-resistant sleeve (2) are both provided with an annular slot (14); the end surfaces of the two retaining rings (7) close to the polymer wear-resistant sleeve (2) are both provided with a convex ring (15); the outer diameter of the convex ring (15) is smaller than the maximum outer diameter of the retaining ring (7); the convex rings (15) on the two retaining rings (7) are respectively inserted into two different annular slots (14) on the polymer wear-resistant sleeve (2); a plurality of arc-shaped grooves (16) are arranged around the end surface of the convex ring (15); and a ball (16) is installed in the arc-shaped groove (16). 7); a retaining ring (7) located at the rear is provided with a plurality of sliders (18) on the side away from the polymer wear-resistant sleeve (2); a plurality of slide grooves (19) are correspondingly provided on the front end surface of the rear barrel section (13); the sliders (18) are inserted into the corresponding slide grooves (19); a blind hole (20) is provided on the retaining ring (7) at a position between the sliders (18); a spring (21) is installed in the blind hole (20); two ends of the spring (21) are respectively pressed against the bottom of the blind hole (20) and the front end surface of the rear barrel section (13).

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