Hydraulic rotary sand eraser

Abstract

The present application provides a kind of hydraulic rotary sand flushing nib, belong to the technical field of oil well sand flushing in oil production engineering.The nib body is divided into upper part, middle part and lower part, the first through hole, the second through hole, the first annular groove and the second annular groove are arranged in the middle part of nib body, the limiting stop ring for limiting the position of inner sleeve is arranged in the upper part of nib body, the adjusting stop ring and the track are arranged in the lower part of nib body, the inner sleeve is arranged in the inside of nib body, the third through hole and the fourth through hole corresponding to the first annular groove and the second annular groove are respectively arranged on the side wall of inner sleeve, the track pin matched with track is arranged on the lower part of inner sleeve, the nozzle holder is connected in the inside of inner sleeve, and the nozzle is fixed on the nozzle holder;The compression spring is arranged between the adjusting stop ring and the end of inner sleeve;The thrust bearing is fixed on the end of middle part of nib body through bearing stop ring.The present application can realize all-around sand flushing, and reduce the labor intensity and environmental pollution of operator.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil well sand flushing in oil production engineering, and particularly relates to a hydraulic rotary sand flushing pen point. BACKGROUND

[0002] At present, in the sand flushing operation of oil fields, hydraulic sand flushing or fluid-powered rotary sand flushing pen points and hydraulic impact sand flushing pen points are mostly used, and certain effects have been achieved in field application. Patent No. CN111997543B discloses a reamer type sand flushing pen point to solve the problem of unsatisfactory sand flushing effect of the existing rotating or impact pen point. Oil well sand flushing mainly relies on the impact force of liquid to flush sand out of the oil well, but due to the limitation of equipment and construction technology, the problem is that dead angles are prone to occur during sand flushing, resulting in sand bridges becoming more and more solid, which adversely affects sand flushing. Although there are sand flushing pen points with variable rotating directions in the prior art, the rotating direction is limited by the pressure of sand flushing liquid, and cannot be rotated as required by the ground operator to meet the requirements of field work. In addition, such sand flushing consumes a large amount of sand flushing liquid, which brings a lot of pressure to environmental protection work, and also increases the labor intensity of field operators, affecting the sand flushing effect, ultimately affecting the normal production capacity of the oil reservoir, and is not conducive to oil production. Therefore, a new type of hydraulic impact sand flushing pen point with forward and reverse rotation is needed to meet the requirements of field work. SUMMARY

[0003] To solve the above problems existing in the prior art, the present application discloses a hydraulic rotary sand flushing pen point, which can rotate sand flushing in the designed direction, the rotating direction is not limited by the pressure of sand flushing liquid, and the phenomenon of more and more solid sand flushing can be avoided through forward and reverse flushing. The use of the sand flushing pen point can improve the sand flushing speed, reduce the amount of sand flushing liquid, reduce the labor intensity of field operators, and play a certain auxiliary role in stable and high-yield production of oil wells.

[0004] The technical scheme adopted by the present application is: a hydraulic rotary sand flushing pen point, comprising a pen point body, an inner sleeve, a thrust bearing, a nozzle holder and a nozzle. The pen point body is integrated and divided into an upper part, a middle part and a lower part. The side wall of the middle part of the pen point body is respectively provided with a first through hole and a second through hole. The inner part of the pen point body is respectively provided with a first ring-shaped groove and a second ring-shaped groove corresponding to the first through hole and the second through hole. The inner wall of the lower part of the pen point body is provided with a track for changing the rotation direction. The inner part of the upper part of the pen point body is provided with a limiting stop ring for limiting the position of the inner sleeve. The inner part of the lower part of the pen point body is provided with an adjusting stop ring. The inner sleeve is arranged in the inner part of the pen point body. The side wall of the inner sleeve is respectively provided with a third through hole and a fourth through hole corresponding to the first ring-shaped groove and the second ring-shaped groove. The lower side wall of the inner sleeve is provided with a track pin matched with the track. The nozzle holder is a long ring type and is coupled in the inner part of the inner sleeve through a fixed coupling. The nozzle is a circular ring. The nozzle is fixed on the nozzle holder. A compression spring is arranged between the adjusting stop ring and the end of the inner sleeve. The thrust bearing is fixed at the end of the middle part of the pen point body through a bearing stop ring.

[0005] The adjusting stop ring mainly plays a limiting role and adjusts the length of the compression spring to determine the pressure when the rotation direction is changed.

[0006] Further, the outer diameters of the upper part and the lower part of the pen point body are the same, and the outer diameter of the middle part is larger than that of the upper part.

[0007] Further, the upper part of the pen point body is further provided with a damper and a rotating sleeve. The damper is sleeved on the outer wall of the upper part of the pen point body through a pin and is coupled with the rotating sleeve to prevent the pen point body from rotating too fast and causing atomization phenomenon, which is not conducive to sand flushing. The inner part of the rotating sleeve is provided with a positive rotation ring-shaped groove, a reverse rotation ring-shaped groove, a positive rotation nozzle and a reverse rotation nozzle. The positive rotation ring-shaped groove is communicated with the positive rotation nozzle, and the reverse rotation ring-shaped groove is communicated with the reverse rotation nozzle. The other end of the positive rotation nozzle is communicated with the first ring-shaped groove, and the other end of the reverse rotation nozzle is communicated with the second ring-shaped groove.

[0008] Further, the upper part of the pen point body is further coupled with a coupling through threads or other fixed coupling methods.

[0009] Further, the main role of the first ring-shaped groove and the second ring-shaped groove is to facilitate the rotation direction of the rotating sleeve controlled by the sand flushing liquid, and to facilitate the mutual communication of the first ring-shaped groove and the second ring-shaped groove with the third through hole and the fourth through hole.

[0010] Further, the hole diameter of the first through hole and the second through hole is 4-6mm.

[0011] Further, the coupling method of the damper and the rotating sleeve is welding, riveting or pin coupling.

[0012] Further, the number of track pins is an even number, which is conducive to ensuring the balance of force.

[0013] Further, the fixed connection mode of the nozzle frame and the inner sleeve is screwing or welding or pin or riveting.

[0014] Further, the track comprises a long radial slot, a V slot and a short oblique slot, the long radial slot extends radially along the inner wall of the pen tip body to one end of the V slot, the V slot is communicated with the long radial slot and the short oblique slot at two ends respectively, and the other end of the short oblique slot is communicated with another long radial slot.

[0015] Further, the lower inner diameter of the rotating sleeve is larger than the upper inner diameter, and the bottom of the rotating sleeve is serrated to facilitate sand washing and grinding of sand bridges at the well bottom.

[0016] The beneficial effects generated by the technical scheme are that the sand washing pen tip has a track, the rotating direction of the sand washing pen tip can be adjusted according to the actual situation on site, omnidirectional sand washing is realized, the sand washing speed is improved, the production rate of the oil well is improved, and the labor intensity of the on-site operator and environmental pollution are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is a schematic diagram of a hydraulic rotary sand washing pen tip body;

[0018] Fig. 2 It is a schematic diagram of a rotating sleeve of a hydraulic rotary sand washing pen tip;

[0019] Fig. 3 It is a schematic diagram of an inner sleeve of a hydraulic rotary sand washing pen tip;

[0020] Fig. 4 It is a schematic diagram of embodiment 1 of the application;

[0021] Fig. 5 It is a schematic diagram of the A-A section of embodiment 1 of the application;

[0022] Fig. 6 It is a schematic diagram of the B-B section of embodiment 1 of the application;

[0023] Fig. 7 It is a schematic diagram of the track of embodiment 1 of the application.

[0024] The numbers in the diagram are explained as follows: 1. Coupling, 2. Pen tip body, 3. Damper, 4. Limiting ring, 5. Rotating sleeve, 6. Forward-rotating annular groove, 7. First through hole, 8. First annular groove, 9. Third through hole, 10. Reverse-rotating annular groove, 11. Second through hole, 12. Second annular groove, 13. Fourth through hole, 14. Track pin, 15. Track, 16. Inner sleeve, 17. Thrust bearing, 18. Bearing retaining ring, 19. Compression spring, 20. Adjusting retaining ring, 21. Nozzle, 22. Nozzle holder, 23. Forward-rotating nozzle, 24. Reverse-rotating nozzle, 25. Upper part, 26. Middle part, 27. Lower part. Detailed Implementation

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] To further understand the invention, the invention will be described in detail below with reference to the accompanying drawings and embodiments:

[0028] Example 1:

[0029] like Figs. 1-7As shown, a hydraulically rotary sandblasting pen tip includes a pen tip body 2, an inner sleeve 16, a thrust bearing 17, a nozzle holder 22, and a nozzle 21. The pen tip body 2 is a single piece, divided into an upper part 25, a middle part 26, and a lower part 27. The sidewalls of the middle part 26 of the pen tip body are respectively provided with a first through hole 7 and a second through hole 11. Inside the pen tip body 2, corresponding to the first through hole 7 and the second through hole 11, there are respectively provided with a first annular groove 8 and a second annular groove 12. The inner wall of the lower part 27 of the pen tip body is provided with a track 15 for changing the rotation direction. Inside the upper part 25 of the pen tip body, there is a limiting ring 4 for limiting the position of the inner sleeve 16. Inside the lower part 27 of the pen tip body, there is an adjusting ring 2. 0. The inner sleeve 16 is located inside the pen tip body 2. The side wall of the inner sleeve 16 is provided with a third through hole 9 and a fourth through hole 13 corresponding to the first annular groove 8 and the second annular groove 12, respectively. The lower side wall of the inner sleeve 16 is provided with a track pin 14 that slides in the track 15. The nozzle holder 22 is fixed inside the inner sleeve 16, and the nozzle 21 is fixed on the nozzle holder 22. A compression spring 19 is provided between the adjusting retaining ring 20 and the end of the inner sleeve 16. The thrust bearing 17 is fixed to the end of the middle part 26 of the pen tip body through the bearing retaining ring 18.

[0030] The adjusting retaining ring 20 mainly serves to limit movement and adjust the length of the compression spring 19 to determine the pressure when the rotation direction changes.

[0031] Furthermore, the upper part 25 and the lower part 27 of the pen tip body 2 have the same outer diameter, while the outer diameter of the middle part 26 is larger than that of the upper part 25.

[0032] Furthermore, the pen tip body 2 is also provided with a damper and a rotating sleeve 5. The damper 3 is sleeved on the outer wall of the upper part 25 of the pen tip body 2 by a pin and connected to the rotating sleeve 5 to prevent the pen tip body 2 from rotating too fast and causing atomization, which is not conducive to sand removal. The rotating sleeve 5 is sleeved on the middle part 26 of the pen tip body. The rotating sleeve 5 is provided with a forward rotating annular groove 6, a reverse rotating annular groove 10, a forward rotating nozzle 23 and a reverse rotating nozzle 24. The forward rotating annular groove 6 communicates with the forward rotating nozzle 23, and the reverse rotating annular groove 10 communicates with the reverse rotating nozzle 24.

[0033] Furthermore, the upper part 25 of the pen tip body is also connected to the coupling 1 by threads or other fixed connection methods.

[0034] Furthermore, the main functions of the first annular groove 8 and the second annular groove 12 are to facilitate the control of the rotation direction of the rotating sleeve 5 by the sand flushing fluid, and to facilitate the interconnection between the first annular groove 8 and the second annular groove 12 and the third through hole 9 and the fourth through hole 13.

[0035] Furthermore, the diameter of the first through hole 7 and the second through hole 11 is 4-6 mm.

[0036] Furthermore, the damper 3 is connected to the rotating sleeve 5 by welding, riveting, or pin connection.

[0037] Furthermore, the number of track pins 14 is even, which helps to ensure the balance of forces.

[0038] Furthermore, the nozzle holder 22 and the inner sleeve 16 are fixedly connected by thread, welding, pin, or riveting.

[0039] Furthermore, the track 15 includes a connected long radial groove, a V-groove, and a short oblique groove. The long radial groove extends radially along the inner wall of the pen tip body to one end of the V-groove. The two ends of the V-groove are connected to the long radial groove and the short oblique groove, respectively. The other end of the short oblique groove is connected to another long radial groove.

[0040] Furthermore, the lower inner diameter of the rotating sleeve 5 is larger than the upper inner diameter, and the bottom of the rotating sleeve 5 has a serrated shape to facilitate sand flushing and grinding of the sand bridge at the bottom of the well.

[0041] During operation, the sand-flush pen tip descends to the designed position along with the tubing string. The tubing string is repeatedly raised and lowered, and the wedge-shaped portion of the pen tip disrupts the sand bridge, loosening the sand at the bottom of the well. Due to the large length of the tubing string and its wide range of motion at the end, the contact point with the sand bridge varies with each raising and lowering, ensuring thorough disruption of the sand bridge surface for effective sand flushing. Sand-flush fluid is then injected into the device from the ground. Initially, under the action of the compression spring 19, the inner sleeve 16 contacts the limiting retaining ring 4, and the third through hole 9 and the third through hole 13 correspond to the first annular groove 8 and the second annular groove 12, respectively. When sand flushing begins, the flushing fluid injected from the ground has a relatively small flow area due to the relatively small flow area of ​​nozzle 21. Under the action of the flushing fluid and the track 15, the inner sleeve 16 moves downward along the track 15 under the action of the track pin. When the track pin 14 reaches the bottom dead center of the short track, the third through hole 9 is opposite to the first annular groove 8. At this time, the internal flushing fluid enters the first annular groove 8, and then sequentially enters the first through hole 7, the positive rotating annular groove 6, and further enters the positive rotating nozzle 23. At this time, the flushing fluid is sprayed out at high speed along the positive rotating nozzle 23, generating a rotational torque, causing the rotating sleeve 5 to rotate. The function of the damper 3 is to prevent the rotating sleeve 5 from generating too high a rotational speed, so that the flushing fluid atomization does not achieve the sand flushing effect. Furthermore, the serrations at the bottom of the rotating sleeve 5 break the sand bridge at the bottom of the well. At the same time, the tubing swings relative to each other, increasing the area of ​​rotational breaking. The high-speed flushing fluid sprayed from the nozzle 21 further breaks the sand bridge and is carried to the ground with the upward return of the flushing fluid, completing the sand flushing.

[0042] When the flushing fluid is stopped, the pressure on the upper and lower surfaces of the inner sleeve 16 is nearly equal. Under the action of the compression spring 19, the track pin 14 returns to the top of the track. When flushing fluid is injected into the device, due to the relatively small flow area of ​​the nozzle 21, the inner sleeve 16 moves downwards along the track 15 under the action of the flushing fluid and the track 15, driven by the track pin 14. When the track pin reaches the bottom dead center of the long track, the fourth through hole 13 aligns with the second annular groove 12. At this point, the internal flushing fluid enters the fourth through hole 13 sequentially from the second annular groove 12. The anti-rotation annular groove 10 further enters the anti-rotation nozzle 24. At this time, the flushing fluid is sprayed out at high speed along the anti-rotation nozzle 24, generating rotational torque, causing the rotating sleeve 5 to rotate. At this time, the function of the damper 3 is to prevent the rotating sleeve 5 from generating too high a speed, so that the flushing fluid atomization cannot achieve the flushing effect. Furthermore, the serrations at the bottom of the rotating sleeve 5 break the sand bridge at the bottom of the well. At the same time, the tubing string swings relative to each other, increasing the area of ​​rotational breaking. The high-speed flushing fluid sprayed from the nozzle 21 further breaks the sand bridge and is carried to the surface with the upward return of the flushing fluid to complete the flushing.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulically rotary sandblasting pen tip, characterized in that, The pen tip body (2) includes an inner sleeve (16), a thrust bearing (17), a nozzle holder (22), and a nozzle (21). The pen tip body (2) is a single piece, divided into an upper part (25), a middle part (26), and a lower part (27). The side wall of the middle part (26) of the pen tip body is provided with a first through hole (7) and a second through hole (11). The pen tip body (2) is provided with a first annular groove (8) and a second annular groove (12) at the corresponding positions of the first through hole (7) and the second through hole (11). The lower part (27) of the pen tip body is provided with a track (15) for changing the rotation direction. The upper part (25) of the pen tip body is provided with a limiting ring (4) for limiting the position of the inner sleeve (16). An adjusting retaining ring (20) is provided inside the lower part (27) of the body. An inner sleeve (16) is provided inside the pen tip body (2). A third through hole (9) and a fourth through hole (13) corresponding to the first annular groove (8) and the second annular groove (12) are respectively provided on the side wall of the inner sleeve (16). A track pin (14) that slides in the track (15) is provided on the lower side wall of the inner sleeve (16). The nozzle holder (22) is fixed inside the inner sleeve (16), and the nozzle (21) is fixed on the nozzle holder (22). A compression spring (19) is provided between the adjusting retaining ring (20) and the end of the inner sleeve (16). The thrust bearing (17) is fixed to the end of the middle part (26) of the pen tip body through the bearing retaining ring (18). The pen tip body (2) is provided with a rotating sleeve (5), which is fitted in the middle part (26) of the pen tip body. The rotating sleeve (5) is provided with a positive rotating ring groove (6), a negative rotating ring groove (10), a positive rotating nozzle (23) and a negative rotating nozzle (24). The positive rotating ring groove (6) communicates with the positive rotating nozzle (23), and the negative rotating ring groove (10) communicates with the negative rotating nozzle (24). The bottom of the rotating sleeve (5) is serrated.

2. The hydraulic rotary sandblasting pen tip according to claim 1, characterized in that, The upper part (25) and the lower part (27) of the pen tip body (2) have the same outer diameter, while the middle part (26) has a larger outer diameter than the upper part (25).

3. The hydraulic rotary sandblasting pen tip according to claim 1, characterized in that, The diameter of the first through hole (7) and the second through hole (11) is 4-6 mm.

4. The hydraulic rotary sandblasting pen tip according to claim 1, characterized in that, The number of track pins (14) is even.

5. A hydraulic rotary sandblasting pen tip according to claim 1, characterized in that, The track (15) includes a long radial groove, a V groove and a short oblique groove. The long radial groove extends radially along the inner wall of the pen tip body to one end of the V groove. The two ends of the V groove are connected to the long radial groove and the short oblique groove respectively. The other end of the short oblique groove is connected to another long radial groove.

6. The hydraulic rotary sandblasting pen tip according to claim 1, characterized in that, The pen tip body (2) is provided with a damper (3), which is sleeved on the upper part (25) of the pen tip body (2) by a pin and connected to the rotating sleeve (5).

7. A hydraulic rotary sandblasting pen tip according to claim 6, characterized in that, The lower inner diameter of the rotating sleeve (5) is larger than the upper inner diameter.

8. A hydraulic rotary sandblasting pen tip according to claim 5, characterized in that, The nozzle holder (22) and the inner sleeve (16) are fixedly connected by thread, welding, pin or riveting.

9. A hydraulic rotary sandblasting pen tip according to claim 6, characterized in that, The damper (3) and the rotating sleeve (5) are connected by welding, riveting or pin connection.

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