Hydraulic core shift reducing stabilizer

Abstract

The utility model provides a hydraulic core shift reducing stabilizer which is used for being matched with a fishing tool or a milling tool for use and comprises a body, a piston column, a supporting arm mechanism and a reset mechanism. When an upper casing pipe is small, a lower casing pipe is large in size, underground fallen objects are close to the well wall, an inner fishing tool and an outer fishing tool cannot smoothly enter a fish top, or when a milling tool eccentrically abrades the fish top of the underground fallen objects in the milling process, the supporting arm mechanism is jacked open and abuts against the well wall, the whole drilling tool is pushed to deviate from the axis of a well shaft, and drilling is completed. When the drilling tool moves up and down, the fishing tool at the lower end deviates from the center of the shaft and moves up and down, so that the eccentric fish top falling objects in the well are fished; and when the drilling tool rotates and descends, the milling tool at the lower end abuts against the well wall and does circular motion around the shaft, the milling radius of the milling tool is enlarged, and full-radial drilling and grinding of the fish top of the falling object at the well bottom are achieved.

Description

Technical Field

[0001] The utility model relates to the field of oil well workover operations, and more specifically, to a hydraulic eccentric variable diameter stabilizer. Background Technique

[0002] During the production process of oil and gas wells in the oil industry, due to various factors such as formation sand production, scaling, corrosion, casing deformation, and logging tool dropping, the production layer in the well may be buried, and complex situations such as blockage, jamming, breakage, and perforation of the production string may occur, resulting in the need for inspection, repair, and workover operations on the production well. A variety of special workover fishing tools are often used during the operation.

[0003] The main treatment methods for workover fishing mainly include three main methods: drilling and milling, fishing for fallen objects, and alternating use of milling and fishing. According to different complex situations in the well, drilling and milling tools include various shaped drill bits, mill shoes, milling cones, milling shoes, casing mills, etc. There are two methods for fishing for fallen objects: internal fishing and external fishing, and there are dozens of corresponding tools.

[0004] Due to the situation where the fish top of the downhole object is close to the well wall, and in some oil and gas wells, the upper casing is small and the lower casing size is large in the well depth structure, it is difficult for internal fishing and external fishing tools to smoothly enter the fish top, affecting the fishing effect. During the milling process of drilling and milling tools, the downhole object is close to the well wall, and there will be a side skin left between the milling tool and the well wall after milling, which is prone to tool sticking and jamming phenomena. In severe cases, there is a risk of the tool being stuck and causing a secondary downhole accident. Content of the Utility Model

[0005] The main purpose of the utility model is to provide a hydraulic eccentric variable diameter stabilizer to at least solve the problems in the prior art that during the workover fishing process, internal fishing and external fishing tools cannot smoothly enter the fish top, affecting the fishing effect, and that during the milling process of drilling and milling tools, there will be a side skin left between the milling tool and the well wall, which is prone to tool sticking and jamming phenomena.

[0006] To achieve the above object, the present utility model provides a hydraulic eccentric variable diameter stabilizer, which is used in cooperation with a fishing tool or a milling tool. The hydraulic eccentric variable diameter stabilizer includes: a body, the upper end of the body is detachably connected to a drill string, and the lower end of the body is detachably connected to a fishing tool or a milling tool; a fluid passage is arranged inside the body along its length direction, and a side branch passage is vertically penetrated with the fluid passage, and the fluid passage communicates the drill string with the fishing tool or the milling tool; a piston column, which is movably arranged in the side branch passage along the axis direction of the side branch passage, and one end of the piston column extends to the outside of the side branch passage; a support arm mechanism, the first end of the support arm mechanism is hinged to the side wall of the body, and the second end of the support arm mechanism is a free end; a reset mechanism, which is arranged on the side wall of the body and corresponds to the first end of the support arm mechanism; wherein, the support arm mechanism is parallel to the outer side wall of the body in the initial state; the piston column is used for moving outward along the axis direction of the side branch passage under the action of the fluid pressure inside the fluid passage to jack up the support arm mechanism so that the second end of the support arm mechanism abuts against the well wall; the reset mechanism is used for acting on the support arm mechanism when the fluid pressure inside the fluid passage terminates to enable the support arm mechanism to return to the initial state.

[0007] Further, a tapered connection hole is provided at the upper end of the body, an internal thread structure is arranged on the inner side wall of the connection hole, and the upper end of the body is detachably connected to the drill string through the internal thread structure; a tapered connection head is provided at the lower end of the body, an external thread structure is arranged on the outer side wall of the connection head, and the lower end of the body is detachably connected to a fishing tool or a milling tool through the external thread structure.

[0008] Further, a nozzle is provided at the lower end of the body, the nozzle is hermetically connected to the lower port of the fluid passage through a gasket and fastened by a nozzle cap; wherein, the lower end of the fluid passage is communicated with a fishing tool or a milling tool through the nozzle.

[0009] Further, the fluid passage includes an axial section and an oblique section, the axial section is parallel to the central axis of the body and spaced apart by a preset distance to avoid the piston column; the oblique section is inclined at a preset angle with the central axis of the body and is communicated with the axial section and the nozzle.

[0010] Further, the piston column includes a first cylinder section and a second cylinder section, the diameter of the first cylinder section is larger than that of the second cylinder section to form a stepped shaft structure; a limiting ring is arranged at the outer port of the side branch passage; wherein, the outer peripheral wall of the first cylinder section is in sliding seal contact with the inner wall of the side branch passage, and the second cylinder section passes through the inner hole of the limiting ring to limit the maximum displacement of the piston column.

[0011] Further, multiple sealing rings are sleeved on the first cylinder section, and the first cylinder section is in sliding seal contact with the inner side wall of the side branch passage through the multiple sealing rings.

[0012] Further, the support arm mechanism includes: a support arm, the first end of the support arm is hinged to the side wall of the body; a ball seat, fixedly arranged at the second end of the support arm; a ball, freely rollably mounted on the ball seat; wherein, the second end of the support arm abuts against the wellbore through the ball and rolls on the wellbore.

[0013] Further, the reset mechanism includes: a spring piece, the first end of the spring piece is fixedly connected to the side wall of the body through a fastening screw, the second end of the spring piece is a free end and presses on the support arm mechanism; wherein, when the support arm mechanism is jacked up, the second end of the spring piece is driven to flip outward, and when the internal fluid pressure of the fluid passage terminates, the second end of the spring piece resets to drive the support arm mechanism to return to the initial state.

[0014] Further, a receiving groove is formed in the side wall of the body, and the support arm mechanism returns to the initial state and is located in the receiving groove.

[0015] Further, the depth of the receiving groove matches the radial dimension of the support arm mechanism, and the length of the receiving groove matches the length of the support arm mechanism.

[0016] The hydraulic eccentric diameter-changing stabilizer of the technical solution of the present utility model is used in cooperation with a fishing tool or a milling tool, and includes: a body, a piston column, a support arm mechanism and a reset mechanism. The upper end of the body is detachably connected to the drill string, and the lower end of the body is detachably connected to the fishing tool or the milling tool; a fluid passage is arranged inside the body along its length direction and a side branch passage vertically penetrating the fluid passage, and the fluid passage communicates the drill string with the fishing tool or the milling tool; the piston column is movably arranged in the side branch passage along the axis direction of the side branch passage, and one end of the piston column extends to the outside of the side branch passage; the first end of the support arm mechanism is hinged to the side wall of the body, and the second end of the support arm mechanism is a free end; the reset mechanism is arranged on the side wall of the body and corresponds to the first end of the support arm mechanism; the support arm mechanism is parallel to the outer side wall of the body in the initial state; the piston column is used to move outward along the axis direction of the side branch passage under the action of the fluid pressure inside the fluid passage to jack up the support arm mechanism so that the second end of the support arm mechanism abuts against the well wall; the reset mechanism is used to act on the support arm mechanism when the fluid pressure inside the fluid passage terminates so that the support arm mechanism returns to the initial state. Thus, when the well depth structure of the oil and gas well has a small upper casing and a large lower casing size, resulting in the inner fishing and outer fishing tools being unable to smoothly enter the fish top, or during the milling process, the downhole debris is close to the well wall, and there is a skin left between the milling tool and the well wall, causing the tool to stick and jam, the support arm mechanism is pushed open and abuts against the well wall, so as to push the entire drill string to deviate from the axis of the wellbore, and then the fishing tool or the milling tool connected to the lower end of the body deviates from the axis of the wellbore and abuts against the well wall. When the drill string moves up and down, the fishing tool at the lower end deviates from the center of the wellbore and moves up and down, realizing the fishing of the eccentric fish top debris in the well; when the drill string rotates and is lowered, the milling tool at the lower end abuts against the well wall and makes a circular motion around the wellbore, expanding the milling radius of the milling tool, and realizing the full radial drilling and milling of the fish top of the downhole debris. It solves the problems in the prior art that during the workover fishing process, the inner fishing and outer fishing tools cannot smoothly enter the fish top, affecting the fishing effect, and during the milling process of the drilling and milling tools such as milling and reaming, there will be a skin left between the milling tool and the well wall, and it is easy to have problems such as tool sticking and jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The specification drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0018] Figure 1 is an overall cross-sectional structure schematic diagram of a hydraulic eccentric diameter-changing stabilizer according to an optional embodiment of the present utility model;

[0019] Figure 2 is a structure schematic diagram of the piston column of a hydraulic eccentric diameter-changing stabilizer according to an optional embodiment of the present utility model.

[0020] Among them, the above-mentioned drawings include the following reference numerals:

[0021] 10. Body; 11. Fluid passage; 111. Axial section; 112. Oblique section; 12. Branch passage; 13. Nozzle; 14. Gasket; 15. Nozzle cap; 20. Piston rod; 21. First cylinder section; 22. Second cylinder section; 23. Limit ring; 24. Sealing ring; 30. Support arm mechanism; 31. Support arm; 32. Ball seat; 33. Ball; 40. Reset mechanism; 41. Spring piece; 42. Fastening screw. Detailed implementation manners

[0022] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will refer to the drawings and combine with the embodiments to detail the present utility model.

[0023] The hydraulic eccentric variable-diameter stabilizer of the technical solution of the present utility model is used in cooperation with a fishing tool or a milling tool, such as Figure 1As shown in the figure, it includes a main body 10, a piston rod 20, a support arm mechanism 30 and a reset mechanism 40. The upper end of the main body 10 is detachably connected to the drill tool, and the lower end of the main body 10 is detachably connected to a fishing tool or a milling tool. Inside the main body 10, a fluid passage 11 is arranged along its length direction, and a side branch passage 12 that vertically penetrates the fluid passage 11. The fluid passage 11 connects the drill tool with the fishing tool or the milling tool. The piston rod 20 is movably arranged in the side branch passage 12 along the axial direction of the side branch passage 12, and one end of the piston rod 20 extends to the outside of the side branch passage 12. The first end of the support arm mechanism 30 of the support arm mechanism 30 is hinged to the side wall of the main body 10, and the second end of the support arm mechanism 30 is a free end. The reset mechanism 40 is arranged on the side wall of the main body 10 and corresponds to the first end of the support arm mechanism 30. The support arm mechanism 30 is parallel to the outer side wall of the main body 10 in the initial state. The piston rod 20 is used to move outward along the axial direction of the side branch passage 12 under the action of the fluid pressure inside the fluid passage 11 to jack up the support arm mechanism 30 so that the second end of the support arm mechanism 30 abuts against the well wall. The reset mechanism 40 is used to act on the support arm mechanism 30 when the fluid pressure inside the fluid passage 11 terminates so that the support arm mechanism 30 returns to the initial state. Thus, when the upper casing of the well depth structure in the oil and gas well is small and the lower casing size is large, resulting in the inability of the internal fishing and external fishing tools to smoothly enter the fish top, or during the milling process, the downhole debris is close to the well wall, and there is a skin left between the milling tool and the well wall, causing problems such as tool jamming and sticking. The support arm mechanism 30 is pushed open and abuts against the well wall, thereby causing the entire drill tool to deviate from the axis of the wellbore, and then causing the fishing tool or milling tool connected to the lower end of the main body 10 to deviate from the axis of the wellbore and close to the well wall. When the drill tool moves up and down, the fishing tool at the lower end deviates from the center of the wellbore and moves up and down to realize the fishing of the eccentric fish top debris in the well. When the drill tool rotates and is lowered, the milling tool at the lower end is close to the well wall and makes a circular motion around the wellbore, expanding the milling radius of the milling tool to realize the full radial drilling and milling of the fish top of the downhole debris. It solves the problems in the prior art that during the workover fishing process, the internal fishing and external fishing tools cannot smoothly enter the fish top, affecting the fishing effect, and during the milling process of the drilling and milling tools, there will be a skin left between the milling tool and the well wall, and it is easy to have problems such as tool jamming and sticking.

[0024] Optionally, a tapered connection hole is opened at the upper end of the main body 10, and an internal thread structure is arranged on the inner side wall of the connection hole. The upper end of the main body 10 is detachably connected to the drill tool through the internal thread structure. The lower end of the main body 10 is provided with a tapered connection head, and an external thread structure is arranged on the outer side wall of the connection head. The lower end of the main body 10 is detachably connected to the fishing tool or the milling tool through the external thread structure. By arranging the tapered connection hole and the connection head at both ends of the main body 10, it can be conveniently, quickly and stably sealed and connected with the drill tool, the fishing tool or the milling tool, ensuring the convenience of operation and the stability of use.

[0025] Further, a nozzle 13 is provided at the lower end of the body 10. The nozzle 13 is hermetically connected to the lower port of the fluid passage 11 through a gasket 14 and fastened by a nozzle cap 15; the lower end of the fluid passage 11 is hermetically communicated with a fishing tool or a milling tool through the nozzle 13, further ensuring a stable and reliable hermetic connection with the fishing tool or the milling tool.

[0026] Further, the fluid passage 11 includes an axial section 111 and an inclined section 112. The axial section 111 is parallel to the central axis of the body 10 and spaced apart by a preset distance to avoid the piston column 20; one end of the axial section 111 extends to the connection hole at the upper end of the body 10 and is communicated with the drill string; the inclined section 112 is inclined at a preset angle with respect to the central axis of the body 10. One end of the inclined section 112 is communicated with the other end of the axial section 111, and the other end of the inclined section 112 is connected to the nozzle 13 and is communicated with a fishing tool or a milling tool through the nozzle 13.

[0027] Further, as Figure 1 and Figure 2 shown, the piston column 20 includes a first cylinder section 21 and a second cylinder section 22. The diameter of the first cylinder section 21 is larger than that of the second cylinder section 22 to form a stepped shaft structure; a limit ring 23 is provided at the outer port of the branch passage 12; the outer peripheral wall of the first cylinder section 21 is slidably and hermetically abutted against the inner wall of the branch passage 12 and thus moves along the axis of the branch passage 12 under the pressure of the fluid in the branch passage 12; optionally, a plurality of sealing rings 24 are sleeved on the first cylinder section 21, and the first cylinder section 21 is slidably and hermetically abutted against the inner side wall of the branch passage 12 through the plurality of sealing rings 24; the inner diameter of the limit ring 23 matches the outer diameter of the second cylinder section 22, and the second cylinder section 22 slidably passes through the inner hole of the limit ring 23. When the first cylinder section 21 and the second cylinder section 22 move synchronously outward to a certain extent, the first cylinder section 21 is blocked by the limit ring 23, thereby limiting the maximum displacement of the piston column 20; the maximum displacement of the piston column 20 determines the maximum opening angle of the support arm mechanism 30. In practical applications, the maximum displacement of the piston column 20 is designed according to the radial dimension of the wellbore and the maximum opening angle required by the support arm mechanism 30.

[0028] Furthermore, the support arm mechanism 30 includes a support arm 31, a ball seat 32, and a ball 33. The first end of the support arm 31 is hinged to the side wall of the body 10 through a pin shaft; the ball seat 32 is fixedly arranged at the second end of the support arm 31; a spherical ball groove is formed on the side of the ball seat 32, and the ball 33 is freely rotatably installed in the ball groove of the ball seat 32 so as to be able to rotate freely; the inner side wall of the support arm 31 near the first end faces the piston column 20. When the piston column 20 moves outward, the support arm 31 is pushed open, and the ball 33 at the second end of the support arm 31 abuts against the well wall. When the drill tool moves up and down or rotates and is lowered, the ball 33 rolls closely against the well wall, thereby effectively reducing the frictional resistance when the drill tool moves up and down or rotates and is lowered.

[0029] Furthermore, the reset mechanism 40 includes a spring piece 41. The first end of the spring piece 41 is fixedly connected to the side wall of the body 10 through a fastening screw 42. The second end of the spring piece 41 is a free end and presses on the support arm 31; when the support arm 31 is lifted by the piston column 20, the second end of the spring piece 41 is driven to flip outward, and the spring piece 41 undergoes elastic deformation and generates a turning elastic force. When the internal fluid pressure in the fluid passage 11 terminates, the piston column 20 retracts, the support arm 31 loses the support force, and under the action of the elastic force of the spring piece 41, the support arm 31 returns to the initial state.

[0030] Furthermore, a receiving groove is formed on the side wall of the body 10. The depth of the receiving groove matches the radial dimension of the support arm mechanism 30, and the length of the receiving groove matches the length of the support arm mechanism 30; the support arm mechanism 30 is entirely located in the receiving groove in the initial state; thus, the overall shape of the entire body 10 remains consistent, and it can be conveniently placed into the wellbore.

[0031] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hydraulic eccentric variable-diameter stabilizer, characterized in that, The hydraulic eccentric variable-diameter stabilizer is used in cooperation with a fishing tool or a milling tool, and the hydraulic eccentric variable-diameter stabilizer includes: A body (10), the upper end of the body (10) is detachably connected to the drill string, and the lower end of the body (10) is detachably connected to the fishing tool or the milling tool; a fluid passage (11) is arranged inside the body (10) along its length direction and a side branch passage (12) vertically penetrating the fluid passage (11), and the fluid passage (11) communicates the drill string with the fishing tool or the milling tool; A piston column (20) is movably arranged in the side branch passage (12) along the axis direction of the side branch passage (12), and one end of the piston column (20) extends to the outside of the side branch passage (12); A support arm mechanism (30), the first end of the support arm mechanism (30) is hinged to the side wall of the body (10), and the second end of the support arm mechanism (30) is a free end; A reset mechanism (40) is arranged on the side wall of the body (10) and corresponds to the first end of the support arm mechanism (30); Wherein, the support arm mechanism (30) is parallel to the outer side wall of the body (10) in the initial state; the piston column (20) is used to move outward along the axis direction of the side branch passage (12) under the action of the fluid pressure inside the fluid passage (11) to jack up the support arm mechanism (30) so that the second end of the support arm mechanism (30) abuts against the well wall; the reset mechanism (40) is used to act on the support arm mechanism (30) when the fluid pressure inside the fluid passage (11) terminates to make the support arm mechanism (30) return to the initial state.

2. The hydraulic eccentric variable diameter stabilizer according to claim 1, wherein A tapered connection hole is opened at the upper end of the body (10), an internal thread structure is arranged on the inner side wall of the connection hole, and the upper end of the body (10) is detachably connected to the drill string through the internal thread structure; a tapered connection head is arranged at the lower end of the body (10), an external thread structure is arranged on the outer side wall of the connection head, and the lower end of the body (10) is detachably connected to the fishing tool or the milling tool through the external thread structure.

3. The hydraulic eccentric variable-diameter stabilizer according to claim 1, characterized in that, A nozzle (13) is arranged at the lower end of the body (10), the nozzle (13) is hermetically connected to the lower port of the fluid passage (11) through a gasket (14) and fastened by a nozzle cap (15); Wherein, the lower end of the fluid passage (11) is communicated with the fishing tool or the milling tool through the nozzle (13).

4. The hydraulic eccentric variable diameter stabilizer according to claim 3, characterized in that, The fluid passage (11) includes an axial section (111) and an inclined section (112), the axial section (111) is parallel to the central axis of the body (10) and is spaced at a preset distance to avoid the piston column (20); the inclined section (112) is inclined at a preset angle with respect to the central axis of the body (10) and is communicated with the axial section (111) and the nozzle (13).

5. The hydraulic eccentric variable-diameter stabilizer according to claim 1, characterized in that, The piston column (20) includes a first column section (21) and a second column section (22), and the diameter of the first column section (21) is greater than that of the second column section (22) to form a stepped shaft structure; a limiting ring (23) is provided at the outer port of the branch channel (12); Wherein, the outer peripheral wall of the first column section (21) is in sliding and sealing contact with the inner wall of the branch channel (12), and the second column section (22) passes through the inner hole of the limiting ring (23) to limit the maximum displacement of the piston column (20).

6. The hydraulic eccentric variable diameter stabilizer according to claim 5, wherein, A plurality of sealing rings (24) are sleeved on the first column section (21), and the first column section (21) is in sliding and sealing contact with the inner side wall of the branch channel (12) through the plurality of sealing rings (24).

7. The hydraulic eccentric variable diameter stabilizer according to claim 1, characterized in that, The support arm mechanism (30) includes: A support arm (31), the first end of the support arm (31) is hinged to the side wall of the body (10); A ball seat (32), fixedly arranged at the second end of the support arm (31); A ball (33), freely rollably mounted on the ball seat (32); Wherein, the second end of the support arm (31) abuts against the wellbore through the ball (33) and rolls on the wellbore.

8. The hydraulic eccentric variable-diameter stabilizer according to claim 1, wherein, The reset mechanism (40) includes: A spring piece (41), the first end of the spring piece (41) is fixedly connected to the side wall of the body (10) through a fastening screw (42), and the second end of the spring piece (41) is a free end and presses on the support arm mechanism (30); Wherein, when the support arm mechanism (30) is jacked up, the second end of the spring piece (41) is driven to flip outward, and when the internal fluid pressure in the fluid channel (11) terminates, the second end of the spring piece (41) resets to drive the support arm mechanism (30) to return to the initial state.

9. The hydraulic eccentric variable-diameter stabilizer according to claim 1, wherein A receiving groove is formed in the side wall of the body (10), and the support arm mechanism (30) is located in the receiving groove when it returns to the initial state.

10. The hydraulic eccentric variable diameter stabilizer according to claim 9, characterized in that, The depth of the receiving groove matches the radial dimension of the support arm mechanism (30), and the length of the receiving groove matches the length of the support arm mechanism (30).

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