CN115234178A - Anti-abrasion device for drilling tool - Google Patents
Anti-abrasion device for drilling tool Download PDFInfo
- Publication number
- CN115234178A CN115234178A CN202110447223.2A CN202110447223A CN115234178A CN 115234178 A CN115234178 A CN 115234178A CN 202110447223 A CN202110447223 A CN 202110447223A CN 115234178 A CN115234178 A CN 115234178A
- Authority
- CN
- China
- Prior art keywords
- sheath
- drilling tool
- tool according
- prevention device
- wear
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1085—Wear protectors; Blast joints; Hard facing
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1057—Centralising devices with rollers or with a relatively rotating sleeve
- E21B17/1064—Pipes or rods with a relatively rotating sleeve
Abstract
The invention provides an anti-abrasion device for a drilling tool, which comprises a cylindrical body, wherein two ends of the body are respectively used for being connected with a drilling string of the drilling tool, and a sheath which is sleeved on the body and can rotate relative to the body, and the diameter of the sheath is larger than the maximum diameter of the body. Wherein a radial first gap is formed between the sheath and the body, and a ball is disposed in the first gap, so that when the sheath rotates relative to the body, friction between the sheath and the body is formed as rolling friction. The drilling tool for well drilling has a simple structure, can effectively reduce the abrasion of the drill stem in the well drilling process, and improves the well drilling efficiency.
Description
Technical Field
The invention relates to an anti-abrasion device for a drilling tool.
Background
During drilling of the drill string, the drill string performs rotary motion around the axis of the drill string in a wellbore. Under the action of bit pressure, dead weight, torque, mass eccentricity, rock breaking of a drill bit and the like, the drill string has the motion modes of longitudinal vibration, transverse vibration, torsional vibration and the like, so that the drill string is continuously contacted and collided with a well wall. At the point of contact between the drill string and the borehole wall, the outer surface of the drill string generates sliding friction against the borehole wall as the drill string spins. When the ground layer is abraded in a drilling way, the conditions of drill string abrasion, drill tool puncture and the like are easily caused by the collision and abrasion between the drill string and the well wall, and the underground safety of the drill string is seriously threatened. Therefore, an anti-abrasion drilling tool for well drilling suitable for high-abrasive stratum is required to be connected into a drill string, so that the abrasion of the drill string is reduced, and the underground safety of the drilling tool is guaranteed.
The invention of patent CN207278207U provides an anti-abrasion joint, which comprises an anti-abrasion joint main body, an upper retaining ring, an anti-abrasion sheath, a lower retaining ring screw and a lower retaining ring. The abrasion-proof joint can convert the friction generated by the drilling tool between the borehole and the borehole wall into the friction between the abrasion-proof joint main body, the upper retaining ring, the lower retaining ring and the abrasion-proof sheath, thereby avoiding the direct contact between the autorotation drilling tool and the borehole wall and reducing the abrasion of the drilling tool to a certain extent. However, the abrasion type between the abrasion-proof joint main body and the protective sleeve is still sliding friction, so that after long-time contact action, the abrasion of the abrasion-proof joint main body and the protective sleeve is still large, and the protection effect on the drill string is not ideal.
Disclosure of Invention
In view of the above technical problems, the present invention is directed to a wear prevention device for a drilling tool. The anti-abrasion device for the drilling tool is simple in structure, abrasion of the drill column in the drilling process can be effectively reduced, and the drilling efficiency is improved.
According to the present invention there is provided a wear prevention device for a drilling tool, comprising: the drilling tool comprises a cylindrical body, wherein two ends of the body are respectively used for being connected with a drilling string of the drilling tool, and a sheath which is sleeved on the body and can rotate relative to the body, and the diameter of the sheath is larger than the maximum diameter of the body.
Wherein a radial first gap is formed between the sheath and the body, and a ball is disposed in the first gap, so that when the sheath rotates relative to the body, friction between the sheath and the body is formed as rolling friction.
In a preferred embodiment, a plurality of holes matched with the balls are uniformly formed in the inner wall of the sheath, and at least one ball is arranged in each hole.
In a preferred embodiment, the piston has the same size as the opening, a first step part and a second step part are respectively configured on the outer wall of the body along the axial direction, and the sheath is fixed in a first groove formed by the first step part and the second step part in a mode of simultaneously abutting against the first step part and the second step part.
In a preferred embodiment, the second step portion below the first step portion is configured as a detachable locking ring fitted over the outer wall of the body.
In a preferred embodiment, a plurality of second grooves are uniformly arranged in the circumferential direction on the upper surface of the lock ring close to the support ring, and the second grooves penetrate through the lock ring in the horizontal direction.
In a preferred embodiment, a through hole communicating with the inner cavity is provided on the bottom plate, and the second groove is arranged obliquely in the vertical direction, and one end of the second groove close to the body is higher than one end of the second groove far away from the body.
In a preferred embodiment, the locking ring is connected to the body by external threads provided on an outer wall of the body.
In a preferred embodiment, screw mounting holes are provided in an outer wall of the body, and the locking ring is fixed to the body by a screw penetrating the locking ring.
In a preferred embodiment, the sheath further comprises a cross beam connected to a side of the sheath adjacent the body for supporting the ball.
In a preferred embodiment, the surfaces of the body and the sheath are both treated to resist wear.
Drawings
The invention will now be described with reference to the accompanying drawings.
Fig. 1 shows a schematic view of a wear protection arrangement for a drilling tool according to an embodiment of the invention.
Fig. 2 isbase:Sub>A schematic view of the wear prevention device forbase:Sub>A drilling tool of fig. 1, taken along the planebase:Sub>A-base:Sub>A'.
Fig. 3 is a schematic view of the wear prevention device for a drilling tool shown in fig. 1, taken along the plane B-B'.
In the present application, the drawings are all schematic and are used only for illustrating the principles of the invention and are not drawn to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
Fig. 1 shows a wear protection device 100 for a drilling tool (hereinafter referred to as wear protection device) according to an embodiment of the invention. As shown in fig. 1, the anti-abrasion device 100 includes a body 10 configured in a cylindrical shape. The first end 12 and the second end 14 of the body 10 are configured to be connected to a male head 13 and a female head 15, respectively. The body 10 is connected to an oil well drilling tool (not shown) through the connection male head 13 and the connection female head 15, and is lowered into an oil well together with the oil well drilling tool.
As shown in fig. 1, a sheath 20 is provided on an outer wall of an axially intermediate portion of the body 10. The sheath 20 is configured as a cylinder, which is sleeved on the body 10 and can rotate relative to the body 10. Specifically, a first step 16 and a second step 18 are respectively provided on the outer wall of the body 10 in the axial direction, and the second step 18 is provided axially below the first step 16. Thus, a first groove 19 is formed between the first step 16 and the second step 18 in the axial direction. The sheath 20 is arranged in the first recess 19 and is fixed by simultaneously abutting against the first step 16 and the second step 18. Meanwhile, the diameter of the sheath 20 is set to be larger than the maximum diameter of the body 10, so that when the anti-friction device 100 is in the underground, the sheath 20 is always abutted against the well wall, and the body 10 is not in contact with the well wall.
As shown in fig. 1, an annular first gap 30 is formed between the sheath 20 and the body 10 in a radial direction. A plurality of balls 35 are uniformly disposed in the first gap 30. Both ends of the ball 35 are simultaneously abutted against the first groove 19 and the sheath 20, thereby fixing the ball 35 in the first gap 30. Thereby, when the sheath 20 rotates with respect to the body 10, the balls 35 can change sliding friction between the body 10 and the sheath 20 into rolling friction, thereby reducing frictional force between the body 10 and the sheath 20.
In a preferred embodiment, a plurality of semi-circular holes (not shown) are uniformly formed on the surface of the end of the sheath 20 close to the first gap 30, and the semi-circular holes are matched with the shape and size of the ball 35, so that the ball 35 is fixed in the semi-circular holes, and the ball 35 is prevented from being offset and dislocated during rolling, and the rotation between the body 10 and the sheath 20 is prevented from being influenced.
As shown in fig. 1, the second step 18 is configured as an annular locking ring 40 that fits over the body 10. The locking ring is detachably connected to the body 10. In this embodiment, an external thread 42 is provided on an outer wall of the body 10, and the locking ring 40 is coupled to the body 10 by the external thread 42. With this arrangement, the fixation of the sheath 20 can be enhanced on the one hand by tightening the locking ring 40; alternatively, the sheath 20 may be removed from the body 10 by removing the locking ring 40, thereby facilitating maintenance of the body 10 and sheath 20, or replacement of a different size sheath 20 as required by the job.
Meanwhile, a screw mounting hole 45 is provided on an outer wall of the body 10 corresponding to the locking ring 40. The locking ring 40 is secured to the body 10 by a screw 48 extending through the locking ring 40. Through the fixation of the screw 48, the locking ring 40 can be effectively prevented from being loosened by rotating relative to the body 10 under the action of friction force after being screwed down, so that the sheath 20 is prevented from shaking or falling off from the body 10.
As shown in fig. 1, the sheath 20 further includes a plurality of cross members 50 connected to a side of the sheath 20 adjacent to the body 10. The cross-piece 50 is disposed at an end of the sheath 20 adjacent to the locking ring 40.
Fig. 2 isbase:Sub>A schematic view of the wear prevention device forbase:Sub>A drilling tool shown in fig. 1, taken along the planebase:Sub>A-base:Sub>A'. As shown in fig. 2, the cross member 50 is uniformly arranged in the first gap 30 in the circumferential direction, and the ball 35 located at the lowermost end (i.e., the end close to the locking ring) in the first gap 30 is placed on the cross member 50. The cross beam 50 plays a role in bearing, and prevents the balls 35 from extruding the locking ring 40 to cause the downward dislocation of the locking ring 40 due to bearing; on the other hand, the cross beam 50 also can limit the balls 35 to prevent the balls 35 from being dislocated, thereby improving the reliability of the anti-abrasion device 100.
Fig. 3 is a schematic view of the wear prevention device for a drilling tool shown in fig. 1, taken along the plane B-B'. As shown in fig. 1 and 3, in the present invention, since the diameter of the sheath 20 is larger than the maximum diameter of the body 10, a boss 58 extending in the radial direction of the body 10 is formed above the sheath 20. Debris located on the wall of the well above the anti-fretting device 100 can easily fall onto the boss 58 during drilling of the drilling tool. With the irregular vibration of the anti-friction device 100, part of the large-volume impurities will be shaken off and fall into the oil well, and part of the small-volume dust will enter the fine gap 60 between the body 10 and the upper part of the sheath 20 and enter the first gap 30 through the opening 38 on the first gap 30, thereby affecting the rolling of the balls 35, and further causing the failure of the anti-friction device 100.
If the opening 38 of the first gap 30 near the end of the upper joint 14 is completely closed, the accumulation of dust particles in the gap 60 may result, and the sheath 20 may be locked and may not rotate relative to the body 10, resulting in the failure of the entire anti-wear device 100. Therefore, a plurality of second grooves 49 for discharging the fine dust are also provided on the locking ring 40.
The plurality of second grooves 49 are uniformly arranged on the lock ring 40 along the circumferential direction. Meanwhile, each of the independent second grooves 49 penetrates the lock ring 40 in the horizontal direction. Since the lock ring 40 and the body 10 are fixed and do not rotate relative to each other in the present invention, and the beam 50 rotates with the sheath 20 relative to the body 10, it can be easily understood that the lock ring 40 rotates relative to the beam 50.
And as the locking ring 40 rotates relative to the cross member 50, the second groove 49 periodically engages a second gap (not shown) between the circumferential edges of the cross member 50. When the second groove 49 is abutted with the second gap, the dust particles in the first gap 30 will fall into the second groove 49 under the action of gravity, and then be thrown out of the anti-abrasion device 100 along the second groove 49 under the action of the rotating centrifugal force.
In a preferred embodiment, said second groove 49 is arranged obliquely in the vertical direction with its end closer to the body 10 higher than its end further away from the body. This allows the entry second recess 49 to be more quickly thrown out of the anti-friction device 100 by gravity.
In a preferred embodiment, the surfaces of the body 10 and the sheath 20 are both treated to resist wear. For example, the body 10 and the sheath 20 are heat-treated to increase the strength and wear resistance of the body 10 and the sheath 20, or the wear resistance of the body 10 and the sheath 20 is increased by plating the surfaces of the body 10 and the sheath 20 by a chemical vapor deposition method. Increasing the useful life of the anti-scuffing device 100.
The operation of the wear protection device 100 for a drilling tool according to the present invention is briefly described as follows.
The abrasion prevention device 100 for a drilling tool of the present invention is operated by being connected to a drill string through a male connector 13 and a female connector 15 at both ends of a body 10, and being lowered into an oil well together with the drill string. At this time, the sheath 20 is always abutted against the well wall, ensuring that the drill string is not directly contacted with the well wall. When the drill string is rotated and drilled, sliding friction between the drill string and the well wall is replaced by rolling friction between the body 10 and the sheath 20, so that the friction force applied to the drill string is reduced, and the drill string is prevented from directly impacting on the well wall due to shaking. Therefore, the effect of protecting the drill column is achieved, the abrasion of the drill column in the drilling process is reduced, and the drilling efficiency is improved.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A wear prevention device (100) for a drilling tool, comprising:
a cylindrical body (10) having two ends for connection to a drill string of the drilling tool, respectively, an
A sheath (20) which is sleeved on the body and can rotate relative to the body, the diameter of the sheath is larger than the maximum diameter of the body,
wherein a radial first gap (30) is formed between the sheath and the body, and balls (35) are provided in the first gap such that when the sheath rotates relative to the body, friction between the sheath and the body is formed as rolling friction.
2. The wear protection device (100) for drilling tools according to claim 1, wherein the inner wall of the sheath is uniformly provided with a plurality of holes adapted to the balls, each hole having at least one ball mounted therein.
3. The wear protection device (100) for a drilling tool according to claim 1 or 2, characterized in that a first step (16) and a second step (18) are configured on the outer wall of the body in the axial direction,
the sheath is fixed in a first groove (19) formed between the first step portion and the second step portion in such a manner as to simultaneously abut against the first step portion and the second step portion.
4. The wear prevention device (100) for a drilling tool according to claim 3, wherein a second step below the first step is configured as a detachable locking ring (40) fitted over the outer wall of the body.
5. The wear prevention device (100) for a drilling tool according to claim 4, characterized in that a plurality of second grooves (49) are uniformly provided in the circumferential direction on the upper surface of the locking ring near the support ring, the second grooves penetrating the locking ring in the horizontal direction.
6. The wear prevention device (100) for a drilling tool according to claim 5, characterized in that the second groove is arranged obliquely in the vertical direction with its end closer to the body higher than its end further away from the body.
7. The wear prevention device (100) for a drilling tool according to claim 6, characterized in that the lock ring is connected with the body by means of an external thread (42) provided on the outer wall of the body.
8. The wear prevention device (100) for a drilling tool according to claim 7, characterized in that screw mounting holes (45) are provided on the outer wall of the body, and the locking ring is fixed to the body by a screw (48) penetrating the locking ring.
9. The wear prevention device (100) for a drilling tool according to claim 1 or 2, characterized in that the sheath further comprises a cross beam (50) connected to a side of the sheath near the body for supporting the balls.
10. The wear protection device (100) for a drilling tool according to claim 1 or 2, wherein the surfaces of the body and the sheath are both wear resistant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110447223.2A CN115234178A (en) | 2021-04-25 | 2021-04-25 | Anti-abrasion device for drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110447223.2A CN115234178A (en) | 2021-04-25 | 2021-04-25 | Anti-abrasion device for drilling tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115234178A true CN115234178A (en) | 2022-10-25 |
Family
ID=83666945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110447223.2A Pending CN115234178A (en) | 2021-04-25 | 2021-04-25 | Anti-abrasion device for drilling tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115234178A (en) |
-
2021
- 2021-04-25 CN CN202110447223.2A patent/CN115234178A/en active Pending
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