Internal circulation sleeve-salvage integrated salvage tool and salvage method

Abstract

One end of a composite connector is connected with a pipe column, the side face of the other end of the composite connector is connected with a casing milling pipe, and the end of the composite connector is connected with a fishing cone. The washover shoe is connected with the end part of the washover pipe; the effective length of the milling pipe is not smaller than the length of the fishing section of the fishing position, and the inner diameter of the milling pipe is larger than the maximum outer diameter of a fish at the upper fishing weak section of the fishing position. A water hole is formed in the fishing cone; an alloy end is arranged at the end, away from the washover pipe, of the washover shoe. According to the method, the workover treatment time efficiency can be improved, the workover cost can be reduced, and the problem that no circulating channel exists after the fishes are fished can be successfully solved. Fish sticking points can be successfully removed, meanwhile, the fallen fish can be successfully fished, the underground complex treatment time efficiency is improved, the well repair cost is effectively reduced, and the problem that no circulation channel exists after the fallen fish is fished is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas development, and particularly relates to an internal circulation fishing tool integrated with fishing and a fishing method. Background Art

[0002] When complex fishing operations are carried out in mountain front workover wells, usually, there will be debris deposition between the top of the fish head and the annulus between the fish head and the wellbore. In addition, more complex is that there are foreign objects blocking inside the fish body. The conventional fishing process treatment method is as follows: In the first trip, a string of pipe with a circulation valve or a circulation joint is lowered to flush the debris between the top of the fish head and the annulus between the fish head and the wellbore. The foreign objects and impurities on the top of the fish head and around the fish head are cleaned up to ensure the smooth entry of the next fishing string into the fish. In the second trip, a fishing string is lowered to carry out substantial fishing. Using the conventional fishing process, at least two trips of drilling are required to complete the treatment. Moreover, from the analysis of the implementation nodes of the entire conventional fishing process, there will be three restrictive factors: First, the foreign objects and impurities that are not circulated out in the workover mud will gradually form new deposits between the top of the fish head and the annulus between the fish head and the wellbore along the wellbore during the lifting process of the pipe string for cleaning the fish head, reducing the success rate of the fishing tool of the second fishing string entering the fish or even failing to enter the fish successfully, resulting in longer working hours, lower efficiency, and higher costs. Second, if the water eye inside the fish body is blocked by foreign objects and impurities, in case of abnormal situations, the workover mud cannot circulate normally, and the personnel on watch cannot master the mud parameters in the wellbore, which will pose a great potential safety hazard to well control in the wellbore. Third, if the water eye inside the fish body is blocked by foreign objects and impurities, after the fish is fished out, there is no circulation channel when the pipe string is lifted, and the workover mud in the water eye of the drill string in the wellbore cannot normally leak into the wellbore. When lifting and discarding the drill pipe stands, the workover mud will spray onto the drill floor and surrounding equipment along the drill pipe stands after the connections are released, easily forming mud pollution on the drill floor and surrounding areas, and the cleaning takes a long time and is also prone to cause personal injuries to the drill floor construction personnel.

[0003] For the patent application with the patent publication number CN204371161U and the name of a collection tool for drilling and grinding debris, it includes an upper joint, a lower joint, a connecting piece, a nozzle, and a collection cylinder. The upper joint and the lower joint are respectively connected to both ends of the collection cylinder. The upper joint is connected to the drill pipe, and the lower joint is connected to the drilling and grinding head. There is a fluid channel between the lower joint and the drilling and grinding head. An opening is provided on the side wall of the collection cylinder. The nozzle is fixed to one end of the upper joint through the connecting piece, and the nozzle orifice is aligned with the opening. An internal circulation channel is provided inside the collection cylinder. The diversion pipe is the inlet of the internal circulation channel, and the opening is the outlet of the internal circulation channel. A filtering device and a chip collection chamber are also provided inside the collection cylinder. The filtering device is located on the internal circulation channel, and the chip collection chamber is provided below the filtering device to receive the debris filtered by the filtering device. The device of this patent application cannot solve the problem of no circulation channel after fishing out the fish. Summary of the Invention

[0004] In order to overcome the problems existing in the above-mentioned prior art, the object of the present invention is to provide an inner circulation sleeve fishing integrated fishing tool and a fishing method, so as to quickly solve downhole or workover complex treatment accidents, improve the results of workover complex treatment, ultimately improve the well recovery rate, and successfully solve the problem of no circulation channel after fishing the fish

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] An inner circulation sleeve fishing integrated fishing tool, comprising:

[0007] A composite joint, one end of the composite joint is connected to the pipe string, a milling tube is connected to the side of the other end, and a fishing cone is connected to the end;

[0008] A milling shoe, the milling shoe is connected to the end of the milling tube;

[0009] Wherein, the effective length of the milling tube is not less than the length of the fish section at the fishing position, and the inner diameter of the milling tube is greater than the maximum outer diameter of the fish falling at the weak section above the fishing position; a water eye is opened on the fishing cone; an alloy end is provided at one end of the milling shoe away from the milling tube.

[0010] Optionally, one end of the composite joint is provided with a pipe string connection thread, and the other end is provided with a fishing cone connection thread.

[0011] Optionally, a first end connection thread of the milling tube is provided on the side of the composite joint.

[0012] Optionally, the first end connection thread of the milling tube is arranged at one end close to the fishing cone connection thread.

[0013] Optionally, the fishing cone is a high-strength male cone.

[0014] Optionally, the fishing cone is a high-strength female cone.

[0015] Optionally, the effective length of the milling tube is 2.5 m to 3 m.

[0016] A fishing method for an inner circulation sleeve fishing integrated fishing tool, comprising the following steps:

[0017] S1: Lower the inner circulation sleeve fishing integrated fishing tool to above the fish top, start the pump and circulate smoothly, then carry out milling operation. When the milling footage is consistent with the effective length of the milling tube, observe the changes in pump pressure and hook load; continue to apply drilling pressure and rotate the drill string to force the fishing thread to squeeze and bite into the inner wall or outer wall of the fish for threading;

[0018] S2: Continue to lower the pipe string so that the female cone fishing thread passes through the weak point above the fish top to below the middle of the outer wall of the tubular fish, apply drilling pressure and rotate the drill string to force the fishing thread to squeeze and bite into the outer wall of the fish for threading;

[0019] S3: If the hook load on the weight indicator increases after threading, lift the pipe string to thread and end the threading.

[0020] S4: Lift or reverse circulate to fish out all or part of the fish.

[0021] Optionally, in step S1, observe the change in pump pressure. If it is determined that the tool has entered the fish, set high-pressure protection and stop the pump in a timely manner to prevent high pump pressure or blocked pump from causing high-pressure injury to people and fishing failure.

[0022] Optionally, in step S1, observe the change in hook load. If the threading and fishing with the fishing taper are successful, test lift the pipe string. After ensuring that the fish is caught, move to release the stuck or reverse circulate to fish out the fish.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention uses a milling string and a milling shoe to first clean the foreign matters and impurity deposits on the top of the fish head and between the fish head and the annulus, relieve the stuck point of the fish or clean out part of the fish and let it enter the milling string. Immediately, the fish head reaches the position of the fishing taper connected to the upper part of the matching tool. Under the action of the drilling pressure and torque, the threads of the fishing taper bite into the inner / outer wall of the fish to thread and fish. With two closely connected operations in one trip of the pipe string, that is, immediately entering the fish, guiding the fish and threading and fishing after cleaning the fish head, the two processes that cannot be closely connected by two trips of the pipe string in the conventional fishing process are completed (lifting the pipe string to the wellhead after cleaning the fish head and then lowering the fishing pipe string; during the whole process of lifting the fishing pipe string after fishing the fish, the workover mud can leak into the wellbore through the side water holes attached to the high-strength fishing taper, ensuring that there is no mud in the drill pipe stand after releasing the buckle, reducing the mud pollution on the drill floor. At the same time, the side water holes attached to the high-strength fishing taper ensure that the workover mud can circulate normally under any circumstances, ensuring the well control safety in the wellbore. It can quickly solve the downhole or workover complex treatment accidents, improve the workover complex treatment results, and ultimately improve the well recovery rate. The present invention can not only improve the workover operation efficiency and reduce the workover cost, but also successfully solve the problem of no circulation channel after fishing the fish. It can successfully relieve the stuck point of the fish and successfully fish the fish at the same time, achieving the improvement of the downhole complex treatment efficiency, effectively reducing the workover cost, and solving the problem of no circulation channel after fishing the fish. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. Additionally, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to assist in understanding the present invention, rather than specifically defining the shapes and proportional dimensions of the components of the present invention. In the drawings:

[0026] Figure 1 is a schematic diagram of the composite joint of the present invention;

[0027] Figure 2 Schematic diagram of the high-strength male taper of the present invention;

[0028] Figure 3 Schematic diagram of the high-strength female taper of the present invention;

[0029] Figure 4 Schematic diagram of the milling tube of the present invention;

[0030] Figure 5 Schematic diagram of the milling shoe of the present invention.

[0031] Among them, 1. Composite joint; 11. Pipe string connection thread; 12. First-end connection thread of the milling tube; 13. Fishing taper connection thread; 2. High-strength male taper; 21. Male taper water eye; 3. High-strength female taper; 31. Female taper water eye; 4. Milling tube; 41. Composite joint connection thread; 42. Milling shoe connection thread; 5. Milling shoe; 51. Second-end connection thread of the milling tube; 52. Alloy end. Detailed implementation manners

[0032] In order to enable those skilled in the art in this technical field to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0033] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] As Figure 1 shown, an internal circulation fishing and milling integrated fishing tool of the present invention includes: a composite joint 1, a milling tube 4 and a milling shoe 5.

[0037] One end of the composite joint 1 is connected to the pipe string, and the side of the other end is connected to the milling pipe 4. A fishing cone is connected to the end of the composite joint 1. The milling shoe 5 is connected to the end of the milling pipe 4.

[0038] One end of the composite joint 1 is provided with a pipe string connection thread 11, and the other end is provided with a fishing cone connection thread 13. The side of the composite joint 1 is provided with a first end connection thread 12 of the milling pipe. The first end connection thread 12 of the milling pipe is arranged at one end close to the fishing cone connection thread 13.

[0039] One end of the milling pipe 4 is provided with a composite joint connection thread 41, and the other end is provided with a milling shoe connection thread 42. One end of the milling shoe 5 is provided with a second end connection thread 51 of the milling pipe, and the other end is provided with an alloy end 52.

[0040] The effective length of the milling pipe 4 is not less than the length of the fish section at the fishing position. The inner diameter of the milling pipe 4 is greater than the maximum outer diameter of the fish in the weak section of the fish above the fishing position. Specifically, the length of the fish section at the fishing position is 2 m, and the effective length of the milling pipe 4 is 2.5 m to 3 m. Specifically, the outer diameter at the target fishing position is 88.9 mm, and the fishing range of the fishing cone is 85 mm to 100 mm.

[0041] The outer diameter of the fishing cone is smaller than the inner diameter of the wellbore. The fishing range of the inner diameter of the fishing cone is not less than the outer diameter at the target fishing position of the fish, and the minimum hole cleaning can meet the requirement of passing through the weak section of the fish above the fishing position. During the fishing process, it can meet the requirements of threading and related fishing techniques.

[0042] Optionally, the fishing cone is a high-strength male tap 2, and a male tap water eye 21 is opened on the high-strength male tap 2. The high-strength male tap 2 is provided with fishing threads.

[0043] Optionally, the fishing cone is a high-strength female tap 3, and a female tap water eye 31 is opened on the high-strength female tap 3. A fishing tap is arranged inside the high-strength female tap 3.

[0044] The milling pipe 4 forms a connection between the lower parts of the composite joints. The effective length cannot be lower than the length of the fish section at the fishing position. The inner diameter must be greater than the maximum outer diameter of the fish in the weak section of the fish above the fishing position, and sufficient torque and tensile strength are transmitted during the fishing process;

[0045] The milling pipe 4 clears the debris in the annulus through milling, processes the sticking point of the fish, so that the fish part enters the milling pipe until the fish top reaches the lower end face of the fishing cone. Then, apply appropriate drilling pressure and rotate the drill string to force the fishing threads of the fishing cone to squeeze and bite into the inner wall or outer wall of the fish to make a thread. When the made thread can withstand a certain pulling force and torque, the fish can be completely or partially fished out by lifting or back-off methods.

[0046] An internal circulation fishing integrated fishing tool of the present invention, when in use, includes the following steps: Among them, the fishing cone is a high-strength female cone 3.

[0047] Check whether the appearance of the tool is intact, check whether the tool size meets the wellbore well control requirements and the fishing tool size requirements, and check whether the tool thread connection threads are damaged. The drill pipe lifting requirements are smooth operation, and it is prohibited to unscrew the pipe on the rotary table.

[0048] After lowering the internal circulation fishing integrated fishing tool to 1 m to 2 m above the fish top, start the pump and circulate smoothly before fishing, and observe the changes in pump pressure and hook load. To observe the change in pump pressure, the normal circulating pump pressure needs to be recorded before fishing. During the fishing process, if the tool enters the fish, there may be a phenomenon of rising pump pressure or pump jamming. It should be noted that if it is judged that the tool has entered the fish, high-pressure protection should be set and the pump should be stopped in time to prevent high pump pressure or pump jamming from causing high-pressure injuries and fishing failures.

[0049] Observe the change in hook load during the fishing process, that is, record the initial hook load before fishing. If the fishing cone successfully makes a connection during the fishing and making connection process, when the drill string is pulled up, the hook load will increase accordingly according to the situation of the fallen fish below. After ensuring that the fallen fish is caught, according to the actual situation, the stuck pipe can be moved or back-off fishing can be carried out for the fallen fish.

[0050] Continue to lower the drill string so that the fishing thread of the high-strength female cone 3 passes through the weak point above the fish top to below the middle of the outer wall of the tubular fallen object, apply appropriate drilling pressure and rotate the drill string to force the fishing thread to squeeze into the outer wall of the fallen object to make a connection.

[0051] After making 3 to 4 connections, if the hook load on the weight indicator rises, pull up the drill string to make a connection, and the load will increase compared to the original hook load.

[0052] After pulling up and making 8 to 10 connections, the hook load increases and the connection is completed.

[0053] When the made connection can withstand a certain tensile force and torque, the fallen fish can be completely or partially fished out by pulling up or back-off.

[0054] Embodiment 1

[0055] The following combines Figure 1 To further illustrate the specific implementation manners of the present invention.

[0056] In this embodiment, the drill string structure from bottom to top is: a reverse-thread imported alloy thick-wall internal centralizer mill shoe 5 with a diameter of 146 mm or 118 mm, 1 reverse-thread extended thick-wall milling pipe 4 with a diameter of 140 mm, a reverse-thread composite joint 1 with a diameter of 140 mm, and the inner diameter of the composite joint 1 is 104 mm. The fishing range is a reverse-thread high-strength female cone 3 with a diameter of 80 mm to 92 mm and side water holes, 2 reverse-thread under-reaming cups with a diameter of 140 mm, 3 reverse-thread spiral drill collars, 1 reverse-thread drill pipe, a reverse-thread float valve, and a reverse-thread drill pipe to the wellhead.

[0057] The reaming section is from 5041.34 m to 5049.86 m, with a footage of 8.52 m. The reaming shoe 5 is severely worn. There are multiple transverse scratches on the outer surface of the body of the reaming pipe 4. A FOX tubing with a length of 9.42 m is retrieved by a female taper. After inspection, there is slight peeling in the middle of the tubing, and the scale on the outer wall of the tubing is 1 mm to 3 mm.

[0058] Example 2

[0059] In this example, the drill string structure from bottom to top is as follows: a reverse-threaded imported alloy thick-wall high-efficiency reaming shoe 5 with a diameter of 146 or 118 mm, a reverse-threaded extended thick-wall reaming pipe 4 with a diameter of 140 mm, a reverse-threaded composite joint 1. Inside the composite joint 1, there is a reverse-threaded high-strength male taper 2 with side water eyes and a fishing range diameter of 66 mm to 85 mm, a reverse-threaded overshot with a diameter of 140 mm, 1 reverse-threaded spiral drill collar, a reverse-threaded overshot with a diameter of 140 mm, 2 reverse-threaded spiral drill collars, 1 reverse-threaded drill pipe, a reverse-threaded float valve, reverse-threaded drill pipes to the wellhead.

[0060] The reaming section is from 5049.65 m to 5058.93 m, with a footage of 9.28 m; the reaming shoe 5 is severely worn. After inspection, a FOX tubing with a length of 9.65 m is retrieved by a male taper, and the lower tubing coupling is brought out. After inspection, there is slight peeling in the middle of the tubing, and the scale on the outer wall of the tubing is 2 - 3 mm.

[0061] In this example, the drill string structure from bottom to top is as follows: a reverse-threaded imported alloy thick-wall high-efficiency reaming shoe 5 with a diameter of 146 mm or 119 mm, 1 reverse-threaded extended thick-wall reaming pipe 4 with a diameter of 140 mm, a reverse-threaded composite joint 1. Inside the composite joint 1, there is a high-strength female taper with side water eyes and a reverse-threaded fishing range diameter of 80 mm to 92 mm, 1 reverse-threaded spiral drill collar, a reverse-threaded overshot with a diameter of 140 mm, 2 reverse-threaded spiral drill collars, reverse-threaded drill pipes to the wellhead.

[0062] The reaming section is from 5056.87 m to 5068.38 m, with a footage of 11.51 m; after inspection, the reaming shoe 5 is severely worn. Two FOX tubings are retrieved by a female taper, with a total length of 19.07 m. After inspection, there is slight peeling in the middle of the first tubing, and the scale on the outer wall of the tubing is 1 - 3 mm.

[0063] In the above examples, the equipment components involved, if not otherwise specified, are all conventional equipment components. The structural setting methods, working methods, or control methods involved, if not otherwise specified, are all conventional setting methods, working methods, or control methods in this field.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention shall be covered by the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims

1. An internal circulation and fishing integrated fishing tool, characterized in that, it includes: A composite joint (1), one end of the composite joint (1) is connected to the pipe string, a milling pipe (4) is connected to the side of the other end, and a fishing cone is connected to the end; A milling shoe (5), the milling shoe (5) is connected to the end of the milling pipe (4); Wherein, the effective length of the milling pipe (4) is not less than the length of the fish section at the fishing position, and the inner diameter of the milling pipe (4) is greater than the maximum outer diameter of the fish that falls in the weak section above the fishing position; water eyes are provided on the fishing cone; an alloy end (52) is provided at one end of the milling shoe (5) away from the milling pipe (4).

2. An internal circulation and fishing integrated fishing tool according to claim 1, characterized in that, One end of the composite joint (1) is provided with a pipe string connection thread (11), and the other end is provided with a fishing cone connection thread (13).

3. An internal circulation and fishing integrated fishing tool according to claim 1, characterized in that, The side of the composite joint (1) is provided with a first-end connection thread (12) of the milling pipe.

4. An internal circulation and fishing integrated fishing tool according to claim 1, characterized in that, The first-end connection thread (12) of the milling pipe is arranged at one end close to the fishing cone connection thread (13).

5. An internal circulation and fishing integrated fishing tool according to claim 1, characterized in that, The fishing cone is a high-strength male tap (2).

6. An internal circulation and fishing integrated fishing tool according to claim 1, characterized in that, The fishing cone is a high-strength female tap (3).

7. An internal circulation and fishing integrated fishing tool according to claim 1, characterized in that, The effective length of the milling pipe (4) is 2.5 m to 3 m.

8. A fishing method for an internal circulation and fishing integrated fishing tool, characterized in that, it includes the following steps: S1: Lower the internal circulation and fishing integrated fishing tool to above the fish top, start the pump to circulate smoothly, and then perform milling operation. When the milling footage is consistent with the effective length of the milling pipe (4), observe the changes in pump pressure and hook load; continue to apply drilling pressure and rotate the drill string to force the fishing thread to squeeze and bite into the inner wall or outer wall of the fallen object to make a thread; S2: Continue to lower the pipe string so that the fishing thread of the female tap (3) passes through the weak point above the fish top to below the middle of the outer wall of the tubular fallen object, apply drilling pressure and rotate the drill string to force the fishing thread to squeeze and bite into the outer wall of the fallen object to make a thread; S3: After making a thread, if the hook load on the weight indicator rises, lift the pipe string to make a thread, and the thread making ends; S4: Lift or reverse the thread to fish out all or part of the fallen fish.

9. A fishing method for an internal circulation and fishing integrated fishing tool according to claim 8, characterized in that, In step S1, observe the change in pump pressure. If it is judged that the tool has entered the fish, set high-pressure protection and stop the pump in time to prevent high pump pressure or pump jamming from causing high-pressure injuries and fishing failures.

10. A fishing method for an internal circulation and fishing integrated fishing tool according to claim 8, characterized in that, In step S1, observe the change in hook load. If the fishing cone makes a successful thread, try to lift the pipe string. After ensuring that the fallen fish is captured, move to release the stuck or reverse the thread to fish out the fallen fish.

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