Well repair fishing tool

Abstract

The utility model discloses a well repair fishing tool which is arranged at the bottom of a drilling tool and comprises an upper connector, a fishing assembly, a cutting assembly and a flushing assembly, and the upper connector is connected to the bottom of the drilling tool; the fishing assembly comprises a core shaft and a slip, the core shaft is detachably connected to the bottom of the upper connector, the slip is movably arranged on the periphery of the core shaft in a sleeving mode, and the core shaft and the slip are both provided with conical surfaces which can be attached to each other; the cutting assembly comprises a cutting body detachably connected to the bottom of the fishing assembly, the cutting body is provided with a window for mounting a blade, and a piston assembly capable of driving the blade to extend out for cutting is arranged in the cutting body; the flushing assembly is detachably connected to the bottom of the cutting body and used for cleaning the pipe falling objects, the blade stretches out to cut the pipe falling objects, then when the slip is lifted upwards, the core shaft is attached to the conical face of the slip, radial external expansive force is generated, and the slip is lifted upwards. And the problem of a stuck tubing coupling and a thickened part can be solved by drilling once while milling scrap iron is not generated.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum exploration and development, in particular to a well repair and fishing tool. Background Art

[0002] At the oilfield construction site, when a pipe with a thickened portion gets stuck, it is necessary to use a milling barrel to mill out the annulus holder before the next step of salvage can be carried out. The couplings and thickened portions of the pipe are too large to be processed with a milling barrel, so they need to be specially processed and then the pipe body is milled with a milling barrel for segmented milling and salvage.

[0003] If the oil pipe coupling and the enlarged part are milled, the milling footage is long, and a lot of iron filings are generated. If they are not rinsed clean, they will settle in the annulus, making the subsequent casing milling construction more difficult or even jamming the drill. If the coupling is salvaged and the enlarged part is milled with a grinding shoe, milling iron filings will still be generated, which will cause difficulties in subsequent construction and increase the time for salvaging the coupling. In the prior art, the salvage tube needs to enter the fallen objects and the casing annulus to achieve salvage. If the coupling and the thickened part of the pipe are large in size, they cannot be salvaged.

[0004] Therefore, how to ensure that the stuck oil pipe coupling and the thickened part can be solved in one drilling trip without generating grinding and milling iron chips to improve the construction efficiency is a problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The utility model aims to provide a well repairing and fishing tool which can solve the stuck oil pipe coupling and thickening part in one drilling trip without generating grinding and milling iron chips, so as to improve the construction efficiency.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a well repair and fishing tool, which is arranged at the bottom of the drilling tool and includes:

[0007] An upper joint connected to the bottom of the drilling tool;

[0008] The fishing assembly includes a mandrel and slips, wherein the mandrel is detachably connected to the bottom of the upper joint, the slips are movably sleeved on the outer periphery of the mandrel, and both the mandrel and the slips are provided with conical surfaces that can fit each other;

[0009] The cutting assembly comprises a cutting body detachably connected to the bottom of the salvaging assembly, the cutting body is provided with a window for installing a blade, and the cutting body is provided with a piston assembly capable of driving the blade to extend for cutting;

[0010] The flushing assembly is detachably connected to the bottom of the cutting body.

[0011] Preferably, the mandrel is a hollow cylindrical structure, and the mandrel includes a tapered section, the tapered section is located in the middle of the mandrel, and the larger end of the tapered section is located at the bottom of the tapered section;

[0012] The slip is a stepped shaft structure with a through hole in the middle. The slip comprises a first shaft with a smaller diameter and a second shaft with a larger diameter. The conical surface is located on the outer periphery of the conical section and the inner wall of the second shaft.

[0013] Preferably, the circumferential surface of the second shaft is provided with a fang structure adapted to the thread of the coupling of the oil pipe to be salvaged, and the angle between the conical surface in the second shaft and the circumferential surface of the second shaft is 30°±2°.

[0014] Preferably, a stop step is provided inside the cutting body, and the piston assembly comprises:

[0015] The piston is a hollow cylinder, and a ball seat in the shape of an inverted truncated cone is arranged inside the piston. A number of throttle holes extending vertically and connected to the cutting body are evenly distributed around the ball seat. A first step with a smaller diameter and a second step with a larger diameter are arranged on the outer wall of the piston;

[0016] A first elastic member is disposed between the stop step and the second step, and is used to support the piston, and the stop step can abut against the first step that has moved downward to limit the downward movement height of the piston;

[0017] When the ball falls into the ball seat, the liquid can only fall along the throttle hole, and the liquid accumulates inside the piston to increase the weight of the piston, so that the piston moves downward and presses down the first elastic member;

[0018] When the liquid delivery is stopped, the liquid falls along the throttle hole, the liquid inside the piston is reduced, the weight of the piston is reduced, and the first elastic member pressed downward is restored to drive the piston to return to its original position.

[0019] Preferably, a plurality of sealing rings are provided on the outer periphery of the top end of the piston for sealing between the cutting body and the piston.

[0020] Preferably, countersunk holes of the same height are provided on both sides of the window, the blade is provided with a second through hole, and the pin is installed in the countersunk hole after passing through the second through hole, so that the blade can rotate around the axis of the pin relative to the window.

[0021] Preferably, the blade comprises:

[0022] A cam structure is located at the bottom of the piston, and the downwardly moving piston can press down the cam structure to rotate the blade;

[0023] The knife body is connected to the cam structure, and a blade for cutting is arranged at one end of the knife body away from the cam structure.

[0024] Preferably, a retaining spring is connected to the outer side of the blade, and the retaining spring is used to pull the end of the blade away from the cutting edge, so that the blade is located in the window when the cam structure is not pressed down.

[0025] Preferably, the flushing assembly comprises a flushing body, which is connected to the bottom of the cutting body and is provided with a main water eye connected to the cutting body, and the flushing body comprises a tapered portion, and the tapered portion is provided with a side water eye connected to the main water eye.

[0026] Preferably, the top of the upper joint is provided with a first internal thread and the bottom is provided with a second internal thread, and the top of the core shaft is provided with a first external thread and the bottom is provided with a second external thread.

[0027] Compared with the above-mentioned background technology, the well repair and salvage tool provided by the utility model is arranged at the bottom of the drilling tool, and includes an upper joint, a salvage assembly, a cutting assembly and a flushing assembly, the upper joint is connected to the bottom of the drilling tool; the salvage assembly includes a core shaft and a slip, the core shaft is detachably connected to the bottom of the upper joint, the slip is movably sleeved on the outer periphery of the core shaft, and the core shaft and the slip are both provided with conical surfaces that can fit each other; the cutting assembly includes a cutting body detachably connected to the bottom of the salvage assembly, the cutting body is provided with a window for installing a blade, and a piston assembly that can drive the blade to extend for cutting is provided inside the cutting body; the flushing assembly is detachably connected to the bottom of the cutting body.

[0028] Specifically, the upper joint, salvage assembly, cutting assembly and flushing assembly are connected in sequence and connected to the bottom of the drill bit through the upper joint, so that the well repair and salvage tool can be lowered to a preset position in the well. The flushing assembly is used to clean the fallen pipes. After the cleaning is completed, the piston assembly provided inside the cutting body drives the blade to extend to cut the fallen pipes. Thereafter, when the slips inserted into the coupling of the oil pipe to be salvaged are lifted up, the conical surfaces of the core shaft and the slips fit together, generating a radial outward expansion force, thereby preventing the relative movement of the coupling of the oil pipe to be salvaged and the slips, thereby realizing salvage. This can ensure that the stuck coupling and thickened part of the oil pipe can be solved in one drilling trip without generating grinding and milling iron chips, thereby improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure of a well repair and fishing tool provided in an embodiment of the utility model;

[0031] Figure 2 for Figure 1 Schematic cross-sectional view on section AA;

[0032] Figure 3 for Figure 1A local enlarged schematic diagram of point I in the middle.

[0033] in:

[0034] 101-upper joint, 102-slip, 103-core shaft, 201-cutting body, 202-sealing ring, 203-first elastic member, 204-piston, 205-ball, 206-ball seat, 207-throttle hole, 208-stop step, 209-stop spring, 210-pin shaft, 211-blade, 301-conical part, 302-side water eye, 303-main water eye. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] In the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the position or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation of the present invention.

[0038] The utility model aims to provide a well repairing and fishing tool which can solve the stuck oil pipe coupling and thickening part in one drilling trip without generating grinding and milling iron chips, so as to improve the construction efficiency.

[0039] One-trip drilling can solve the problem of stuck oil pipe couplings and thickened parts by flushing the pipe-like fallen objects with water holes, cutting off the main body below the oil pipe couplings and thickened parts, and then salvaging the cut parts. This avoids the difficulties caused by iron filings generated by grinding and milling on subsequent construction, and improves construction efficiency.

[0040] See also Figure 1 To achieve the above-mentioned purpose, the utility model provides a well repair and salvage tool, which is arranged at the bottom of the drilling tool and includes an upper joint 101, a salvage assembly, a cutting assembly and a flushing assembly.

[0041] The upper joint 101 is connected to the bottom of the drilling tool and communicates with the upper joint 101 . The top of the upper joint 101 is provided with a first internal thread and the bottom is provided with a second internal thread.

[0042] The salvage assembly includes a core shaft 103 and a slip 102. The core shaft 103 is detachably connected to the bottom of the upper joint 101. The slip 102 is movably sleeved on the outer periphery of the core shaft 103. Both the core shaft 103 and the slip 102 are provided with conical surfaces that can fit each other. The top of the core shaft 103 is provided with a first external thread and the bottom is provided with a second external thread. The upper joint 101 and the core shaft 103 are threadedly connected through the second internal thread and the first external thread.

[0043] The cutting assembly includes a cutting body 201 which is detachably connected to the bottom of the salvage assembly. A third internal thread is provided at the top of the cutting body 201, and a third external thread is provided at the bottom of the cutting body 201. The cutting body 201 is threadedly connected to the core shaft 103 through the third internal thread and the second external thread. The cutting body 201 is provided with a window for installing a blade 211, and a piston assembly is provided inside the cutting body 201 which can drive the blade 211 to extend for cutting.

[0044] The flushing assembly is detachably connected to the bottom of the cutting body 201 . The flushing assembly includes a flushing body. The flushing body cooperates with the third external thread through a fourth internal thread provided on the top, so that the flushing body is detachably connected to the bottom of the cutting body 201 .

[0045] The flushing body is provided with a main water hole 303 connected to the cutting body 201, and the flushing body includes a tapered portion 301, and the tapered portion 301 is provided with a side water hole 302 connected to the main water hole 303. The tapered portion 301 is a guide cone structure with a large top and a small bottom, which is convenient for introducing fallen fish. The side water hole 302 is located at the upper end of the tapered portion 301 to increase the flushing effect; the lower end of the tapered portion 301 can also be designed to be serrated to apply pressure to move the blockage in the pipe column to increase the flushing effect.

[0046] The upper joint 101 has a connecting function, and the salvage purpose is achieved through the salvage assembly, cutting assembly, and flushing assembly connected thereunder in sequence. The upper joint 101, the salvage assembly, the cutting assembly, and the flushing assembly are connected in sequence and connected to the bottom of the drill bit through the upper joint 101, so that the well repair and salvage tool is lowered to a preset position in the well. The flushing assembly is used to clean the pipes and the like. After the cleaning is completed, the piston assembly provided inside the cutting body 201 drives the blade 211 to extend to cut the pipes and the like. Then, when the slip 102 inserted into the coupling of the oil pipe to be salvaged is lifted up, the conical surfaces of the core shaft 103 and the slip 102 fit together, generating a radial outward expansion force, thereby preventing the coupling of the oil pipe to be salvaged and the slip 102 from moving relative to each other, thereby achieving salvage, and ensuring that the stuck coupling of the oil pipe and the thickened part can be solved in one drilling trip without generating grinding and milling iron chips, so as to improve the construction efficiency.

[0047] In this embodiment, the core shaft 103 is a hollow cylindrical structure, and the core shaft 103 includes a tapered section, which is located in the middle of the core shaft 103, and the larger end of the tapered section is located at the bottom of the tapered section; the slip 102 is a stepped shaft-like structure with a through hole in the middle, and the slip 102 includes a first shaft with a smaller diameter and a second shaft with a larger diameter, and the tapered surface is located on the outer periphery of the tapered section and the inner wall of the second shaft, and the circumferential surface of the second shaft is provided with a fang structure adapted to the thread of the coupling of the oil pipe to be salvaged, and the outer diameter of the second shaft of the slip 102 is larger than the outer diameters of the core shaft 103, the cutting assembly and the flushing assembly, and is slightly larger than the inner diameter of the thread of the coupling of the oil pipe to be salvaged.

[0048] The upper part of the slip 102 is an overall circular ring, the outer diameter of the lower part becomes larger to form a step, and 4-6 narrow grooves are opened longitudinally. The outer surface of the lower end of the slip 102 is processed with sharp teeth consistent with the thread of the salvaged oil pipe coupling, and the inside is processed with a conical surface for matching with the conical section of the core shaft 103; the middle part of the core shaft 103 forms the above-mentioned conical section from top to bottom, which is small at the top and large at the bottom. The taper of the conical section is consistent with the taper of the lower end of the second shaft with a conical surface. For the convenience of salvage, the angle between the conical surface in the second shaft and the circumferential surface of the second shaft is 30°±2°. During salvage, the 30° conical angle of the lower end of the slip 102 enters the oil pipe coupling, so that the outer thread of the lower end of the slip 102 is buckled with the inner thread of the coupling, and the drill tool is lifted, and the conical surfaces of the core shaft 103 and the slip 102 fit together, generating a radial outward expansion force, which prevents the thread tip from withdrawing after buckling, thereby achieving salvage.

[0049] See also Figure 2 and Figure 3 In this embodiment, a stop step 208 is provided inside the cutting body 201, and the piston assembly includes a piston 204 and a first elastic member 203. The piston 204 is located below the third internal thread, and the piston 204 is a hollow cylinder. A first step with a smaller diameter is provided inside the piston 204, and the first step is a ball seat 206 in the shape of an inverted truncated cone to receive the ball 205. The ball 205 can be a steel ball, etc., which can be adapted to the ball seat 206. The ball seat 206 is evenly distributed with a plurality of throttle holes 207 extending vertically and connected to the cutting body 201. Preferably, the number of throttle holes 207 is three, and the top of the throttle hole 207 is a planar structure. The ball 205 falling into the ball seat 206 does not affect the connection between the throttle hole 207 and the inside of the piston 204 and the inside of the cutting body 201. The outer wall of the piston 204 is provided with a first step with a smaller diameter and a second step with a larger diameter.

[0050] The first elastic member 203 is arranged between the stop step 208 and the second step, and is used to support the piston 204. The first elastic member 203 can be a spring, etc. The inner diameter of the stop step 208 is smaller than the outer diameter of the first step, so that the stop step 208 can abut against the first step that has been moved downward to limit the downward height of the piston 204. The second step is used to cooperate with the stop step 208 to limit the extension amount of the blade 211 described below.

[0051] It should be noted that the hollow cylindrical piston 204 can be used for liquid to fall along its interior. When the sphere 205 falls into the ball seat 206, the liquid can only fall along the throttling hole 207. The liquid accumulates inside the piston 204 to increase the weight of the piston 204. The piston 204 moves downward and presses down the first elastic member 203. When the liquid delivery is stopped, the liquid falls along the throttling hole 207, the liquid inside the piston 204 decreases, the weight of the piston 204 decreases, and the first elastic member 203 that is pressed downward restores and drives the piston 204 to return to its original position. The delivery of liquid to the piston 204 can indirectly drive the piston 204 to move downward and recover, thereby realizing the subsequent extension process of the blade 211 to complete the cutting.

[0052] In addition, a plurality of sealing rings 202 are provided on the outer periphery of the top end of the piston 204 . The sealing rings 202 may be two and vertically spaced apart to seal between the cutting body 201 and the piston 204 .

[0053] In this embodiment, countersunk holes of the same height are provided on both sides of the window, and the blade 211 is provided with a second through hole. The pin shaft 210 is inserted into the second through hole and then installed in the countersunk hole, so that the blade 211 can rotate around the axis of the pin shaft 210 relative to the window. The blade 211 includes a cam structure and a knife body. The cam structure is located at the bottom of the piston 204. The piston 204 that moves downward can press the cam structure to rotate the blade 211; the knife body is connected to the cam structure, and a blade for cutting is provided at one end of the knife body away from the cam structure. The blade 211 is a rectangular parallelepiped as a whole, and the blade for cutting is a triangular protrusion. A retaining spring 209 is connected to the outside of the blade 211. The retaining spring 209 is used to pull the end of the blade 211 away from the blade, so that when the cam structure is not pressed down, the blade 211 is located in the window, which is used to protect the blade 211 from exceeding the outer diameter of the cutting body 201 to prevent damage by drilling.

[0054] In summary, the well repair and salvage tool provided by the utility model is arranged at the bottom of the drilling tool, and the drilling tool is lowered to the top of the fish top, the pump is turned on, and after the well is washed normally, the drilling tool is lowered, and the conical part 301 at the bottom of the well repair and salvage tool is convenient for introducing the fallen fish, and the blockage inside the oil pipe is washed by relying on the main water eye 303 and the side water eye 302. After the well is washed clean, the flushing is completed; the steel ball is put in, and after the steel ball is seated, the main liquid flow channel is blocked, and the circulating fluid is forced to go down through the throttling hole 207, generating throttling pressure, pushing the piston 204 to compress the first elastic member 203 to go down, and pushing the blade 211 to rotate around the pin shaft 210 to contact with the cut pipe wall Touch, turn the turntable to cut; during the cutting process, the sealing ring 202 can prevent the circulating fluid from entering the gap between the piston 204 and the cutting body 201, protecting the first elastic member 203; after the cutting is completed, the pump is stopped, the throttling pressure disappears, the piston 204 moves upward under the elastic force of the first elastic member 203, and the piston 204 is pushed back to its original position; the pipe column is lifted, and the blade 211 rotates around the pin 210 under the action of its own weight and the stop spring 209, and returns to its original position to complete the cutting. When salvaging, the drilling tool is lowered, and the 30° cone angle of the lower end of the slip 102 enters the oil pipe coupling, so that the outer thread of the lower end of the slip 102 and the inner thread of the coupling are buckled. When the drilling tool is lifted, the conical surfaces of the mandrel 103 and the slip 102 fit together, generating a radial external expansion force, which prevents the thread tip from withdrawing after buckling, thereby realizing salvage, avoiding the difficulty of subsequent construction caused by the generation of iron filings by grinding and milling, and completing the construction purpose in one trip, with high construction efficiency.

[0055] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0056] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0057] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the utility model.

Claims

1. A well repair and salvage tool, arranged at the bottom of a drilling tool, characterized in that: include: An upper joint connected to the bottom of the drilling tool; A fishing assembly, comprising a mandrel and slips, wherein the mandrel is detachably connected to the bottom of the upper joint, the slips are movably sleeved on the outer circumference of the mandrel, and both the mandrel and the slips are provided with conical surfaces that can fit each other; A cutting assembly, comprising a cutting body detachably connected to the bottom of the salvaging assembly, the cutting body being provided with a window for installing a blade, and a piston assembly being provided inside the cutting body for driving the blade to extend for cutting; The flushing assembly is detachably connected to the bottom of the cutting body.

2. The well repair and fishing tool according to claim 1, characterized in that: The core shaft is a hollow cylindrical structure, and the core shaft includes a tapered section, the tapered section is located in the middle of the core shaft, and the larger end of the tapered section is located at the bottom of the tapered section; The slip is a stepped shaft structure with a through hole in the middle. The slip comprises a first shaft with a smaller diameter and a second shaft with a larger diameter. The conical surface is located at the outer periphery of the conical section and the inner wall of the second shaft.

3. The well repair and fishing tool according to claim 2, characterized in that: The circumferential surface of the second shaft is provided with a fang structure adapted to the thread of the coupling of the oil pipe to be salvaged, and the angle between the conical surface of the second shaft and the circumferential surface of the second shaft is 30°±2°.

4. The well repair and fishing tool according to claim 1, characterized in that: A stop step is provided inside the cutting body, and the piston assembly comprises: The piston is a hollow cylinder, wherein a ball seat in the shape of an inverted truncated cone is arranged inside the piston, wherein a plurality of throttle holes extending vertically and connected to the cutting body are evenly distributed around the ball seat, and a first step with a smaller diameter and a second step with a larger diameter are arranged on the outer wall of the piston; A first elastic member is disposed between the stop step and the second step, and is used to support the piston, and the stop step can abut against the first step that has moved downward to limit the downward movement height of the piston; When the ball falls into the ball seat, the liquid can only fall along the throttle hole, and the liquid accumulates inside the piston to increase the weight of the piston, and the piston moves downward and presses down the first elastic member; When the liquid delivery is stopped, the liquid falls along the throttle hole, the liquid inside the piston is reduced, the weight of the piston is reduced, and the first elastic member pressed downward recovers to drive the piston to return to its original position.

5. The well repair and fishing tool according to claim 4, characterized in that: A plurality of sealing rings are arranged on the outer periphery of the top end of the piston for sealing between the cutting body and the piston.

6. The well repair and fishing tool according to claim 4, characterized in that: Countersunk holes of the same height are arranged on both sides of the window, and the blade is provided with a second through hole. A pin is passed through the second through hole and then installed to the countersunk hole, so that the blade can rotate around the axis of the pin relative to the window.

7. The well repair and fishing tool according to claim 6, characterized in that: The blade comprises: A cam structure is located at the bottom of the piston, and the piston moving downward can press down the cam structure to rotate the blade; A knife body is connected to the cam structure, and a knife blade for cutting is arranged at one end of the knife body away from the cam structure.

8. The well repair and fishing tool according to claim 7, characterized in that: A retaining spring is connected to the outer side of the blade, and the retaining spring is used to pull one end of the blade away from the cutting edge, so that the blade is located in the window when the cam structure is not pressed down.

9. The well repair and fishing tool according to claim 1, characterized in that: The flushing assembly includes a flushing body, which is connected to the bottom of the cutting body and is provided with a main water hole connected to the cutting body. The flushing body includes a tapered portion, and the tapered portion is provided with a side water hole connected to the main water hole.

10. The well repair and fishing tool according to any one of claims 1 to 9, characterized in that: The top of the upper joint is provided with a first internal thread and the bottom is provided with a second internal thread, and the top of the core shaft is provided with a first external thread and the bottom is provided with a second external thread.

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