Rotary vibration and scraping cleaning integrated well washing tool based on screw driving

Through the integrated well washing tool of rotary vibration scraping based on screw drive, the combination of the screw rotor and the screw stator drives the rotation of the oscillation shaft, combined with the rotation and oscillation movement of the cutting drill bit, the sand clamping problem caused by the formation of the sand bed is solved, efficient sand blocking and grinding and sand bridge failure are achieved, and the flushing effect and well washing efficiency are significantly improved.

CN222835721UInactive Publication Date: 2025-05-06YANGTZE UNIVERSITY
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202422244661.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-13
Publication Date
2025-05-06
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

During the mining of large-slope wells, the formation of sand beds causes sand to block the oil outlet channels, increase flow resistance, and the jet speed of existing jet well washing tools is low, and the well washing efficiency and effect are poor.

Method used

The integrated well washing tool for rotary vibration scraping based on screw drive is adopted. The combination of the screw rotor and the screw stator drive the oscillation shaft to rotate, and combined with the rotation and oscillation movement of the cutting drill bit, the grinding of sand blockage and the damage of the sand bridge is achieved, ensuring that the sand particles are not easily deposited to form a sand bed.

Benefits of technology

This well washing tool can significantly improve the flushing effect, ensure that the sand and gravel in the well are thoroughly cleaned, avoid tool jams, improve well washing efficiency, and prevent the formation of sand beds.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222835721U_ABST
    Figure CN222835721U_ABST
Patent Text Reader

Abstract

The utility model relates to a rotating, vibrating, scraping and cleaning integrated well washing tool based on screw driving, and belongs to the technical field of well washing equipment. The shell is provided with an upper end cover, the upper end cover is connected with a lower end cover through a middle shell, a screw rotor is arranged in the shell through a bearing, an oscillation shaft is movably arranged in the middle shell through a centering bearing, one end of the oscillation shaft is connected with the screw rotor, and a compression spring is arranged between the oscillation shaft and the screw rotor; a cutting drill bit is installed on the oscillation shaft extending to the outer side of the lower end cover in a threaded mode, an oscillation guide ring is arranged between the centering bearing and the lower end cover, the oscillation shaft is in key connection with the oscillation guide ring, and the oscillation guide ring can guide the oscillation shaft to do reciprocating oscillation motion. The well washing tool can grind sand plugs and sand bridges, wash and carry stratum sand in all directions, the well washing tool is not prone to being jammed on the premise that the sand washing efficiency is not affected, sand grains are not prone to being deposited in a shaft to form a sand bed through sand breaking in an oscillating and rotating mode, and the washing effect is more remarkable.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to a rotary vibration scraping and cleaning integrated well washing tool based on screw drive, belonging to the technical field of well washing equipment. Background Art

[0002] With the increase in oil production, the output of single wells in oil fields has increased significantly, the crude oil recovery rate has also increased, and the benefits of oil fields have been greatly improved. However, in the process of mining with high-angle wells, sand problems are often encountered. The sand particles in the well gradually settle under their own gravity to form a sand bed. In the oil mining operation, the sand bed will directly affect the mining efficiency, especially in the inclined well section, which is very easy to cause sand jams, block the oil outlet channel, increase flow resistance, and even damage downhole equipment in severe cases.

[0003] In the existing sand-stuck problem, jet-type well-washing tools are usually used for well-washing. The jet-type well-washing tools include a well-washing tool body and a nozzle installed thereon. The well-washing fluid is sprayed to clean the sand and gravel in the well. However, the existing jet-type well-washing tools have a low spraying speed, and the well-washing efficiency and effect are not good, resulting in incomplete cleaning of the sand and gravel in the well. It is often necessary to increase the flushing volume to improve the flushing capacity, but this will also lead to waste of manpower and material resources. On the other hand, when flushing the deflection section of the wellbore, the jet-type well-washing tool is easily eccentric in the wellbore due to its own gravity, resulting in uneven jet flow rate and low sand flushing efficiency. At the same time, sand is easy to adhere to the surface of the tool, blocking the nozzle, further affecting the flushing effect. Therefore, it is necessary to improve it. Summary of the invention

[0004] The utility model aims to provide a screw-driven integrated rotary vibration scraping and cleaning well washing tool which can grind sand plugs and sand bridges, flush formation sand, ensure that the well washing tool is not easy to get stuck without affecting the sand flushing efficiency, and break sand by oscillation and rotation so that sand particles are not easy to deposit in the wellbore to form a sand bed, thereby achieving a more significant flushing effect.

[0005] The technical solution of the utility model is:

[0006] The rotary vibration scraping and cleaning integrated well washing tool based on screw drive includes a shell, and is characterized in that: an upper joint is installed at one end of the shell, an upper end cover is installed at the other end of the shell, the upper end cover is connected to the lower end cover through an intermediate shell, a screw rotor is installed in the shell through a bearing, a screw stator is arranged between the screw rotor and the shell, an oscillation shaft is movably installed in the intermediate shell through a straightening bearing, one end of the oscillation shaft is connected to the screw rotor, a clamping spring is arranged between the oscillation shaft and the screw rotor, the other end of the oscillation shaft extends to the outside of the lower end cover, a cutting drill bit is threadedly installed on the oscillation shaft extending to the outside of the lower end cover, an oscillation guide ring is arranged between the straightening bearing and the lower end cover, the oscillation shaft is key-connected to the oscillation guide ring, and the oscillation guide ring can guide the oscillation shaft to perform reciprocating oscillation motion.

[0007] The end of the screw rotor is provided with a keyway, and the cross section of the keyway is cross-shaped.

[0008] The cutting drill bit is round-headed, with multiple slots on the round head surface, multiple PDC composite sheets embedded on one side edge of the slots, and a trumpet-shaped jet channel is arranged inside the cutting drill bit, and the jet channel is arranged corresponding to the oscillation axis.

[0009] The oscillation guide ring is in a circular ring shape, and a spiral track is arranged inside the oscillation guide ring.

[0010] The upper end cover is in a variable diameter shape, and an assembly hole for mounting the oscillation shaft is arranged inside the upper end cover. A plurality of liquid flow channels are arranged on the upper end cover outside the assembly hole, and the liquid flow channels correspond to the inner cavity of the shell.

[0011] The oscillation shaft is a variable diameter cylindrical shape, and a key is provided at one end of the oscillation shaft, and the cross-section of the key is "cross-shaped". An external thread is provided at the other end of the oscillation shaft. A first boss is provided in the middle of the oscillation shaft, and a liquid flow hole is provided on the first boss. A second boss is provided on the oscillation shaft on one side of the first boss, and a sliding key is provided on the circumference of the oscillation shaft. A blind hole is provided inside the oscillation shaft, and the blind hole of the oscillation shaft is connected to the liquid flow hole of the first boss.

[0012] The beneficial effects of the utility model compared with the prior art are:

[0013] The integrated rotary vibration scraping and cleaning well washing tool based on screw drive can drive the oscillation shaft to rotate under the impact of well washing fluid through the cooperation of the screw rotor and the screw stator. When the oscillation shaft rotates, the oscillation guide ring can guide the oscillation shaft to perform reciprocating oscillation motion under the condition that the compression spring and the oscillation shaft are key-connected with the oscillation guide ring. The oscillation shaft also drives the cutting drill bit to rotate during the rotation process, thereby cutting sand plugs and sand bridges. The well washing fluid enters the jet channel of the cutting drill bit under the guidance of the liquid flow channel and the liquid flow hole, so that the well washing fluid can be sprayed to clean the sand and gravel in the well. The well washing tool can grind the sand plugs and sand bridges, wash the formation sand, and ensure that the well washing tool is not easy to get stuck without affecting the sand washing efficiency. The sand is broken by oscillation and rotation, so that the sand particles are not easy to be deposited in the wellbore to form a sand bed, and the washing effect is more significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional structural schematic diagram of the utility model;

[0015] Figure 2 It is a schematic diagram of the three-dimensional structure of the oscillating guide ring in the utility model;

[0016] Figure 3 It is a three-dimensional structural schematic diagram of the oscillation shaft in the utility model;

[0017] Figure 4 It is a three-dimensional structural schematic diagram of the screw rotor in the utility model;

[0018] Figure 5 It is a schematic diagram of the three-dimensional structure of the cutting drill bit in the utility model.

[0019] In the figure: 1. outer shell; 2. upper joint; 3. upper end cover; 4. liquid flow channel; 5. intermediate shell; 6. lower end cover; 7. screw rotor; 8. screw stator; 9. stabilizing bearing; 10. oscillation shaft; 11. key; 12. first boss; 13. liquid flow hole; 14. second boss; 15. sliding key; 16. clamping spring; 17. oscillation guide ring; 18. spiral track; 19. blind hole; 20. external thread; 21. cutting drill bit; 22. slotting; 23. PDC composite sheet; 24. jet channel; 25. keyway. DETAILED DESCRIPTION

[0020] As attached Figure 1-5 Shown

[0021] The rotary vibration scraping and cleaning integrated well washing tool based on screw drive comprises a shell 1, the shell 1 is cylindrical, one end of the shell 1 is threadedly mounted with an upper joint 2, and the upper joint 2 is used to connect the downhole tool.

[0022] An upper end cover 3 is threadedly installed at the other end of the outer shell 1. The upper end cover 3 is in a variable diameter shape. An assembly hole for installing the oscillation shaft 10 is arranged inside the upper end cover 3. A plurality of liquid flow channels 4 are arranged on the upper end cover 3 outside the assembly hole. The liquid flow channels 4 correspond to the inner cavity of the outer shell 1. When working, the well washing fluid in the inner cavity of the outer shell 1 can flow into the liquid flow channels 4.

[0023] The upper end cover 3 is connected to the lower end cover 6 through the intermediate shell 5. The lower end cover 6 is a variable diameter cylinder. A screw rotor 7 is movably installed inside the shell 1 through a bearing. The end of the screw rotor 7 is provided with a keyway 25, and the cross section of the keyway 25 is cross-shaped.

[0024] A screw stator 8 is arranged between the screw rotor 7 and the housing 1. During operation, when the well washing fluid passes between the screw rotor 7 and the screw stator 8, the screw rotor 7 is driven to rotate.

[0025] An oscillation shaft 10 is movably installed in the intermediate housing 5 through a centering bearing 9. The oscillation shaft 10 is a variable diameter cylindrical shape. A key 11 is provided at one end of the oscillation shaft 10. The cross section of the key 11 is "cross-shaped". The key 11 of the oscillation shaft 10 is movably inserted in cooperation with the keyway 25 of the screw rotor 7. During operation, the screw rotor 7 and the oscillation shaft 10 can be circumferentially fixed to transmit motion and torque, and the two can also slide axially relative to each other.

[0026] A first boss 12 is provided in the middle of the oscillation shaft 10 , a liquid flow hole 13 is provided on the first boss 12 , a second boss 14 is provided on the oscillation shaft 10 on one side of the first boss 12 , and the centering bearing 9 limits the second boss 14 .

[0027] A sliding key 15 is arranged on the circumference of the oscillation shaft 10, a clamping spring 16 is arranged between the oscillation shaft 10 and the screw rotor 7, an oscillation guide ring 17 is arranged between the straightening bearing 9 and the lower end cover 6, the oscillation guide ring 17 is in a circular ring shape, and a spiral track 18 is arranged inside the oscillation guide ring 17. The sliding key 15 of the oscillation shaft 10 is connected with the spiral track 18 under the action of the clamping spring 16. During operation, when the screw rotor 7 drives the oscillation shaft 10 to rotate, the oscillation guide ring 17 can guide the oscillation shaft 10 to perform axial reciprocating motion, thereby causing the oscillation shaft 10 to generate an oscillating force.

[0028] A blind hole 19 is provided inside the oscillation shaft 10 , and the blind hole 19 of the oscillation shaft 10 is connected with the liquid flow hole 13 of the first boss 12 , so that the well washing fluid in the liquid flow hole 13 can enter the blind hole 19 during operation.

[0029] The other end of the oscillation shaft 10 is provided with an external thread 20, and the other end of the oscillation shaft 10 extends to the outside of the lower end cover 6. A cutting drill bit 21 is threadedly installed on the oscillation shaft 10 extending to the outside of the lower end cover 6. The cutting drill bit 21 is round-headed, and a plurality of grooves 22 are provided on the round head surface of the cutting drill bit 21. A plurality of PDC composite sheets 23 are embedded on one side edge of the groove 22. A trumpet-shaped jet channel 24 is provided inside the cutting drill bit 21, and the jet channel 24 is provided corresponding to the blind hole 19 of the oscillation shaft 10.

[0030] When the well washing tool is used, the well washing fluid is first transported to the oil pipe by the ground pressure device and then reaches the upper joint 2. Then, when the well washing fluid passes between the screw rotor 7 and the screw stator 8, the screw rotor 7 is driven to rotate at a high speed. When the screw rotor 7 rotates, the oscillation shaft 10 and the cutting drill bit 21 are driven to rotate synchronously, so that the PDC composite sheet 23 of the cutting drill bit 21 starts to impact the cutting sand plug.

[0031] During the rotation of the oscillation shaft 10, since the sliding key 15 of the oscillation shaft 10 is in contact with the spiral track 18 under the action of the clamping spring 16, the sliding key 15 of the oscillation shaft 10 rotates along the spiral track 18 of the oscillation guide ring 17. Under the elastic force of the clamping spring 16, the oscillation shaft 10 reciprocates along its axial direction. The force of this reciprocating motion is transmitted to the cutting drill bit 21, so that the cutting drill bit 21 has a certain oscillation force, so that the sand particles are not easy to be deposited in the wellbore for the second time, and when the tool is stuck, it can be promptly freed from the stuck state through oscillation, thereby further improving the effect of crushing sand plugging.

[0032] The well washing fluid passing between the screw rotor 7 and the screw stator 8 continues to enter the inner cavity of the intermediate housing 5 through the liquid flow channel 4 of the upper end cover 3, enters the blind hole 19 of the oscillation shaft 10 through the liquid flow hole 13 on the first boss 12, and then flows into the jet channel 24 of the cutting drill bit 21 through the blind hole 19, and is ejected outward from the jet channel 24, which can fully stir the settled sand and effectively destroy the sand bed, so that the sand and impurities are always in a suspended state, which is conducive to the sand flushing fluid carrying the formation sand, thereby realizing the well washing operation of the well washing tool.

[0033] The well washing tool can grind sand plugs and sand bridges, wash in all directions and carry formation sand, ensure that the well washing tool is not easy to get stuck without affecting the sand washing efficiency, and break the sand by oscillation and rotation so that the sand particles are not easy to deposit in the wellbore to form a sand bed, and the washing effect is more significant.

Claims

1. A screw-driven rotary vibration scraping and cleaning integrated well washing tool, comprising a housing (1), characterized in that: An upper joint (2) is mounted on one end of the housing (1), an upper end cover (3) is mounted on the other end of the housing (1), the upper end cover (3) is connected to a lower end cover (6) via an intermediate housing (5), a screw rotor (7) is mounted in the housing (1) via a bearing, a screw stator (8) is arranged between the screw rotor (7) and the housing (1), an oscillation shaft (10) is movably mounted in the intermediate housing (5) via a straightening bearing (9), one end of the oscillation shaft (10) is connected to the screw rotor (7), and the oscillation shaft ( A compression spring (16) is arranged between the oscillation shaft (10) and the screw rotor (7); the other end of the oscillation shaft (10) extends to the outside of the lower end cover (6); a cutting drill bit (21) is threadedly mounted on the oscillation shaft (10) extending to the outside of the lower end cover (6); an oscillation guide ring (17) is arranged between the centering bearing (9) and the lower end cover (6); the oscillation shaft (10) and the oscillation guide ring (17) are key-connected; and the oscillation guide ring (17) can guide the oscillation shaft (10) to perform reciprocating oscillation motion.

2. The integrated rotary vibration scraping and cleaning well washing tool based on screw drive according to claim 1 is characterized in that: The end of the screw rotor (7) is provided with a keyway (25), and the cross section of the keyway (25) is cross-shaped.

3. The integrated rotary vibration scraping and cleaning well washing tool based on screw drive according to claim 1 is characterized in that: The cutting drill bit (21) is in the shape of a round head, a plurality of slots (22) are arranged on the round head surface of the cutting drill bit (21), a plurality of PDC composite sheets (23) are embedded on one side edge of the slots (22), a trumpet-shaped jet channel (24) is arranged inside the cutting drill bit (21), and the jet channel (24) is arranged corresponding to the oscillation shaft (10).

4. The screw-driven rotary vibration scraping and cleaning integrated well washing tool according to claim 1 is characterized in that: The oscillating guide ring (17) is in the shape of a circular ring, and a spiral track (18) is arranged inside the oscillating guide ring (17).

5. The screw-driven rotary vibration scraping and cleaning integrated well washing tool according to claim 1 is characterized in that: The upper end cover (3) is in a variable diameter shape, and an assembly hole for mounting the oscillation shaft (10) is provided inside the upper end cover (3). A plurality of liquid flow channels (4) are provided on the upper end cover (3) outside the assembly hole, and the liquid flow channels (4) correspond to the inner cavity of the housing (1).

6. The integrated rotary vibration scraping and cleaning well washing tool based on screw drive according to claim 1 is characterized in that: The oscillation shaft (10) is in the shape of a variable diameter cylinder. A key (11) is provided at one end of the oscillation shaft (10). The key (11) has a "cross-shaped" cross section. An external thread (20) is provided at the other end of the oscillation shaft (10). A first boss (12) is provided in the middle of the oscillation shaft (10). A liquid flow hole (13) is provided on the first boss (12). A second boss (14) is provided on the oscillation shaft (10) on one side of the first boss (12). A sliding key (15) is provided on the circumference of the oscillation shaft (10). A blind hole (19) is provided inside the oscillation shaft (10). The blind hole (19) of the oscillation shaft (10) is connected to the liquid flow hole (13) of the first boss (12).