High-pressure rotary jet well washing tool

Abstract

A high-pressure rotary jet well washing tool comprises a connector, a rotary assembly and a worm gear assembly. One end of the joint is used for being connected to a downhole tool; the rotating assembly comprises a sleeve rotationally connected to the outer wall of the connector, one end of the sleeve exceeds the other end of the connector and is detachably connected with a barrel, one end of the barrel is closed, multiple circles of water outlet holes are formed in the side wall of the barrel in the axis direction of the barrel, the water outlet holes are evenly distributed in the circumferential direction of the barrel at intervals, and the axes of the water outlet holes are obliquely arranged. The worm gear assembly comprises a connecting shaft detachably installed in the other end of the barrel, and a plurality of fan blades are arranged on the side wall of the connecting shaft in the axis direction of the connecting shaft. And the connecting shaft and the cylinder body rotate synchronously, and the steering force applied to the connecting shaft and the cylinder body is opposite in direction. A step groove is formed in the side wall of the water outlet hole, the section of the step groove is annular, a water hole is matched in the step groove, and the inner wall of one end of the water hole facing the interior of the barrel is arc-shaped. According to the tool, larger impact force can be achieved in the well washing process, and the well washing effect is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling, and in particular to a high-pressure rotary jet well-washing tool. Background Art

[0002] During the construction of oil drilling, the drilling fluid (mud) used in the drilling process may remain in the wellbore, and its solid particles or chemical additives may block the pores of the oil layer or the wellbore channel, and the formation rock debris may also fall off and accumulate at the bottom of the well or the well wall, hindering the flow of oil and gas. At the same time, in the long-term production process, the minerals in water, oil and gas may form scale (such as calcium carbonate, sulfate) or asphalt deposition, reducing the effective diameter of the wellbore and affecting the smooth progress of production. Therefore, well washing operations on oil wells are an important link to ensure the safe and efficient production of oil wells. In the prior art, a cleaning pump is usually directly lowered into the oil and gas well through the drill pipe, and the cleaning pump continuously pumps cleaning fluid into the well to flush asphalt deposits and other substances out of the oil and gas well, thereby achieving the cleaning of the oil and gas well. However, in the actual cleaning process, since the scale, asphalt deposits and other substances remaining in the oil and gas wells are relatively stubborn, and the oil and gas wells are relatively long, the cleaning pump is prone to insufficient impact force of the cleaning fluid after being lowered into the well for a certain distance, and the cleaning effect on the oil and gas wells is not ideal; and in the cleaning process, a reaction force will be applied to the cleaning pump when the cleaning fluid is sprayed out, causing the cleaning pump to rotate, further reducing the impact force on the well wall, causing the cleaning effect to be further affected. Summary of the invention

[0003] In view of the deficiencies of the above-mentioned related prior arts, the present application provides a high-pressure rotary jet well washing tool, which can achieve greater impact force during the well washing process, ensure the well washing effect, and has strong practicality.

[0004] In order to achieve the above object, the present invention adopts the following technologies: A high-pressure rotary jet well washing tool comprises a joint, a rotary assembly and a worm gear assembly.

[0005] The joint is through-connected inside, and one end is used to connect to the downhole tool; the rotating assembly includes a sleeve rotatably connected to the outer wall of the joint, one end of the sleeve exceeds the other end of the joint, and is detachably connected to a cylinder, one end of the cylinder is closed, and the side wall is provided with multiple circles of water outlet holes along its axial direction, and each circle of water outlet holes is evenly spaced along the circumferential direction of the cylinder, and the axis of the water outlet holes is inclined; the worm gear assembly includes a connecting shaft detachably installed inside the other end of the cylinder, and the side wall of the connecting shaft is provided with a plurality of groups of fan blades along its axial direction; the connecting shaft and the cylinder are arranged to rotate synchronously, and the steering forces they are subjected to are in opposite directions.

[0006] Furthermore, a recess is provided on the inner wall of the sleeve, the recess is annular and penetrates to the other end of the sleeve, and the joint is fitted in the recess.

[0007] Furthermore, a plurality of first annular grooves are provided on the outer wall of the joint along the axial direction thereof, a first sealing ring is provided in the first annular groove, and the first sealing ring is interference fit with the inner wall of the recess.

[0008] Furthermore, a second annular groove is provided between two adjacent first annular grooves, a third annular groove is provided on the inner wall of the recess, the third annular groove is aligned with the second annular groove, and a plurality of balls are provided in the second annular groove along its circumferential direction, and the balls are in contact with the bottom of the third annular groove.

[0009] Furthermore, one end of the connecting shaft is connected to the clamping ring, and the end of the clamping ring is provided with a plurality of through holes evenly spaced along the circumferential direction. The through holes are fan-shaped and are used to pass the flushing liquid. The outer wall of the clamping ring is provided with a plurality of clamping strips spaced along its circumferential direction, and the inner wall of the cylinder is provided with a plurality of clamping grooves penetrating at one end along its circumferential direction. The clamping strip is fitted in the clamping groove, and one end abuts against the end of the sleeve.

[0010] Furthermore, a step groove is provided on the side wall of the water outlet, the cross section of the step groove is annular, and a water eye is provided therein, and the inner wall of one end of the water eye facing the inside of the cylinder is arc-shaped.

[0011] Furthermore, a fourth annular groove is provided on the side wall of the step groove, a second sealing ring is fitted in the fourth annular groove, and the second sealing ring is interference fit with the outer wall of the water hole.

[0012] Furthermore, a fifth annular groove is provided on the outer wall of the step groove, a limiting ring is provided in the fifth annular groove, a notch is provided in the limiting ring, and an end surface thereof abuts against an end of the water eye away from the interior of the cylinder.

[0013] Furthermore, two adjacent groups of water outlet holes are arranged in a staggered manner.

[0014] The beneficial effect of the present invention lies in that a worm gear assembly is arranged in the cylinder body, and the twisting direction of the fan blades and the axial direction of the water outlet are arranged so that the connecting shaft and the cylinder body rotate synchronously, while the steering forces exerted on the two are in opposite directions, thereby applying a force on the cylinder body in the opposite direction of its rotation, slowing down its rotation trend, increasing the impact force on the well wall, and thereby improving the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present invention.

[0016] Figure 1 It is a three-dimensional schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure installation of the joint and the sleeve according to an embodiment of the present application.

[0018] Figure 3This is a schematic diagram of the cross-sectional structure of the cylinder according to an embodiment of the present application.

[0019] Figure 4 for Figure 3 An enlarged schematic diagram of point A.

[0020] Figure 5 This is a schematic diagram of the installation of the worm gear assembly according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the implementation modes of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] like Figure 1~Figure 5 As shown, an embodiment of the present application provides a high-pressure rotary jet well washing tool, including: a joint 100 , a rotary assembly 200 , and a worm gear assembly 300 .

[0023] The joint 100 is provided with a through-hole inside to facilitate the introduction of cleaning fluid, and one end of the joint 100 is connected to the downhole tool; the rotating assembly 200 includes a sleeve 201 rotatably connected to the outer wall of the joint 100, one end of the sleeve 201 exceeds the other end of the joint 100, and is detachably connected to a barrel 202, such as by a threaded connection, and one end of the barrel 202 is closed, and the side wall is provided with a plurality of circles of water outlet holes 203 along its axial direction, and each circle of water outlet holes 203 is evenly spaced along the circumferential direction of the barrel 202, and the axis of the water outlet holes 203 is inclined. When the cleaning fluid is introduced into the barrel 202, due to the closed arrangement of one end of the barrel 202, the cleaning fluid can only be discharged from the water outlet holes 203, and under the action of pressure, the cleaning fluid discharged from the water outlet holes 203 is in a jet shape, and due to the inclined arrangement of the axis of the water outlet holes 203, when the cleaning fluid is sprayed on the well wall, a reaction force is transmitted to the barrel 202, causing the barrel 202 to occur Rotate, so as to achieve all-round cleaning of the well wall; but in order to ensure the cleaning effect, the pressure of the cleaning liquid injection is usually increased to ensure that there is sufficient impact force on the well wall, but this will also cause the rotation speed of the cylinder 202 to be too fast, thereby affecting the cleaning effect of the well wall, the worm gear assembly 300 includes a connecting shaft 301 that can be detachably installed inside the other end of the cylinder 202, and the side wall of the connecting shaft 301 is provided with a plurality of groups of fan blades 302 along its axial direction, and the connecting shaft 301 rotates synchronously with the cylinder 202. In the process of passing the cleaning liquid, the fan blades 302 will be subjected to the impact force brought by the cleaning liquid, thereby forcing the connecting shaft 301 to have a tendency to rotate. At this time, the twisting direction of the fan blades 302 is adjusted so that the steering force exerted on the fan blades 302 is opposite to the steering force exerted on the cylinder, thereby being able to offset a part of the steering force of the cylinder 202, thereby reducing the rotation speed of the cylinder 202 and ensuring the cleaning effect on the well wall.

[0024] Specifically, Figure 3-Figure 4 As shown, the axis of the water outlet 203 is tilted in the clockwise direction, and the end of the fan blade 302 facing the sleeve 201 is also twisted in the clockwise direction, so that the steering force on the fan blade 302 is opposite to the steering force on the cylinder.

[0025] Specifically, a recess 204 is provided on the inner wall of the sleeve 201. The recess 204 is annular and extends to the other end of the sleeve 201. The connector 100 fits in the recess 204, and the end of the connector 100 abuts against the end of the recess 204, which ensures a stable connection between the connector 100 and the sleeve 201 and facilitates installation.

[0026] Specifically, the outer wall of the joint 100 is provided with a plurality of first annular grooves 101 along its axial direction, and a first sealing ring 102 is provided in the first annular groove 101. The first sealing ring is interference fit with the inner wall of the recess 204, thereby avoiding leakage during the process of passing the cleaning liquid.

[0027] Specifically, a second annular groove 103 is provided between two adjacent first annular grooves 101, a third annular groove 205 is provided on the inner wall of the recess 204, the third annular groove 205 is aligned with the second annular groove 103, and a plurality of balls 104 are provided in the second annular groove 103 along its circumferential direction, the balls 104 are in contact with the bottom of the third annular groove 205, and under the action of the balls 104, the relative rotation between the joint 100 and the sleeve 201 is smoother.

[0028] Specifically, one end of the connecting shaft 301 is connected to the clamping ring 303, and the end of the clamping ring 303 is provided with a plurality of through holes 304 evenly spaced along the circumferential direction. The through holes 304 are fan-shaped and are used to pass the flushing liquid. The outer wall of the clamping ring 303 is provided with a plurality of spaced clamping strips 305 along its circumferential direction, and the inner wall of the cylinder 202 is provided with a plurality of clamping grooves 206 penetrating at one end along its circumferential direction. The clamping strip 305 is fitted in the clamping groove 206, and one end abuts against the end of the sleeve 201. During the installation of the worm gear assembly 300, it is only necessary to insert the clamping strip 305 into the clamping groove 206, and then the cylinder 202 is connected to the sleeve 201 through threads, and the end of the sleeve 201 will abut against the clamping groove 305, so as to fix the worm gear assembly 300 and ensure that the worm gear assembly 300 and the cylinder 202 rotate synchronously.

[0029] Specifically, a step groove 207 is provided on the side wall of the water outlet 203. The cross-section of the step groove 207 is annular, and a water eye 208 is provided therein. One end of the water eye 208 abuts against the bottom of the step groove 207. During the cleaning of the well wall, the cleaning liquid is discharged through the water eye 208, thereby increasing the injection speed of the cleaning liquid and improving the cleaning effect. In addition, the inner wall of the end of the water eye 208 facing the inside of the cylinder 202 is arc-shaped, which reduces the impact of the cleaning liquid on the water eye 208, avoids its damage, and also allows the cleaning liquid to pass through the water eye 208 more smoothly.

[0030] Specifically, a fourth annular groove 209 is provided on the side wall of the step groove 207, and a second sealing ring 210 is matched in the fourth annular groove 209. The second sealing ring 210 is interference fit with the outer wall of the water eye 208, and a fifth annular groove 211 is provided on the outer wall of the step groove 207. A limiting ring 212 is provided in the fifth annular groove 211, and the end face abuts against the end of the water eye 208 away from the interior of the cylinder 202. Through the cooperation of the second sealing ring 210 and the limiting ring 212, the water eye 208 is stably installed in the water outlet 203, and the limiting ring 212 is provided with a notch to facilitate its insertion into the fifth annular groove 211.

[0031] Specifically, two adjacent groups of water outlet holes 203 are arranged in a staggered manner to ensure uninterrupted cleaning of the well wall.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A high-pressure rotary jet well washing tool, characterized in that: include: A joint (100) is provided with a through-hole arrangement inside, and one end of the joint is used for connecting to a downhole tool; A rotating assembly (200) comprising a sleeve (201) rotatably connected to the outer wall of the joint (100), one end of the sleeve (201) extending beyond the other end of the joint (100) and being detachably connected to a cylinder (202), one end of the cylinder (202) being closed, and a side wall thereof being provided with a plurality of circles of water outlet holes (203) along its axial direction, and each circle of the water outlet holes (203) being evenly spaced along the circumferential direction of the cylinder (202), and the axes of the water outlet holes (203) being arranged obliquely; The worm gear assembly (300) comprises a connecting shaft (301) detachably mounted inside the other end of the cylinder (202), wherein a plurality of groups of fan blades (302) are provided on the side wall of the connecting shaft (301) along the axial direction thereof; The connecting shaft (301) and the cylinder (202) are arranged to rotate synchronously, and the directions of the steering forces applied to the two are opposite.

2. The high-pressure rotary jet well washing tool according to claim 1, characterized in that: The inner wall of the sleeve (201) is provided with a recess (204), the recess (204) is annular and extends to the other end of the sleeve (201), and the joint (100) is fitted in the recess (204).

3. The high-pressure rotary jet well washing tool according to claim 2, characterized in that: The outer wall of the joint (100) is provided with a plurality of first annular grooves (101) along its axial direction, a first sealing ring (102) is provided in the first annular groove (101), and the first sealing ring is interference-fitted with the inner wall of the recess (204).

4. The high-pressure rotary jet well washing tool according to claim 3, characterized in that: A second annular groove (103) is provided between two adjacent first annular grooves (101), a third annular groove (205) is provided on the inner wall of the recess (204), the third annular groove (205) is aligned with the second annular groove (103), and a plurality of balls (104) are provided in the second annular groove (103) along its circumferential direction, the balls (104) being in contact with the bottom of the third annular groove (205).

5. The high-pressure rotary jet well washing tool according to claim 1, characterized in that: One end of the connecting shaft (301) is connected to a clamping ring (303); a plurality of through holes (304) arranged evenly at intervals are provided at the end of the clamping ring (303) along the circumferential direction; the through holes (304) are fan-shaped and are used to pass flushing liquid; a plurality of clamping strips (305) arranged at intervals are provided on the outer wall of the clamping ring (303) along the circumferential direction; a plurality of clamping grooves (206) passing through one end are provided on the inner wall of the cylinder (202) along the circumferential direction; the clamping strip (305) is fitted in the clamping groove (206), and one end of the clamping strip abuts against the end of the sleeve (201).

6. The high-pressure rotary jet well washing tool according to claim 1, characterized in that: The side wall of the water outlet hole (203) is provided with a step groove (207), the cross section of the step groove (207) is annular, and a water eye (208) is matched therein, and the inner wall of one end of the water eye (208) facing the inside of the cylinder (202) is arc-shaped.

7. The high-pressure rotary jet well washing tool according to claim 6, characterized in that: A fourth annular groove (209) is provided on the side wall of the step groove (207), a second sealing ring (210) is fitted in the fourth annular groove (209), and the second sealing ring (210) is interference-fitted with the outer wall of the water hole (208).

8. The high-pressure rotary jet well-washing tool according to claim 6, characterized in that: The outer wall of the step groove (207) is provided with a fifth annular groove (211), a limiting ring (212) is provided in the fifth annular groove (211), the limiting ring (212) is provided with a notch, and the end face thereof abuts against an end of the water eye (208) away from the interior of the cylinder (202).

9. The high-pressure rotary jet well cleaning tool according to claim 1, characterized in that: Two adjacent groups of water outlet holes (203) are arranged in a staggered manner.

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