Salvage method based on breakage accident of rotary guide system, drilling tool assembly and connector

Abstract

The invention provides a salvage method based on a breakage accident of a rotary steering system, a drilling tool assembly and a connector, and the method comprises the following steps: determining a salvage drilling tool assembly according to a breakage position of the rotary steering system, and tripping the salvage drilling tool assembly to a position away from a fish top in a well by a preset distance; starting a pump for circulation; performing weighing; stopping the pump and stopping rotating the drilling tool; slowly lowering to enable the male tap to enter the fish or the female tap to sleeve the fish; first pump starting verification; lifting the drilling tool, limiting the top drive torque, rotating the drilling tool to make a thread, and slowly releasing the top drive torque; the top drive torque is limited, the drilling tool is rotated for fastening, and the top drive torque is slowly released; the top drive torque is limited, the drilling tool is rotated for secondary fastening, the top drive torque is slowly released, and secondary pump starting verification is conducted; and stopping the pump, slowly lifting, and taking out the fish. The drilling tool assembly is used for achieving the fishing method. The salvage connector is used for forming the salvage drilling tool assembly. According to the salvage method, the accident treatment period is effectively shortened, and economic losses are reduced.

Description

Technical Field

[0001] This invention relates to the field of oil and gas drilling technology, specifically to a salvage method based on a rotary steerable system breakage accident, a salvage drill string assembly based on a rotary steerable system breakage accident, and a salvage joint based on a rotary steerable system breakage accident. Background Technology

[0002] During oil drilling, deep-seated oil and gas reservoirs are gradually discovered. To enable the economical and effective development of oil and gas resources limited by surface and underground conditions, significantly increase oil and gas production, reduce drilling costs, protect the natural environment, and achieve significant economic and social benefits, the φ178mm CG STEER rotary steerable system has been widely used in oil and gas drilling in φ215.9mm wellbores. When the CG STEER rotary steerable system is operating in the well, the high friction and torque caused by the extension of the push arm, along with severe axial, lateral, and torsional vibrations from the spindle rotation, induce complex forms of vibration such as stick-slip and eddy currents, as well as high-intensity alternating stress. This leads to fatigue failure and breakage of the CG STEER rotary steerable system. The rotary drive shaft and the non-rotating sleeve are two independent components without connection. The breakage points are located on the upper rotary drive shaft magnet ring body, the middle retaining groove of the upper rotary drive shaft, the upper rotary drive shaft spindle body, the lower male thread root of the upper rotary drive shaft spindle, and the lower rotary drive shaft spindle body. Therefore, it is of great significance to provide a method for retrieving the broken φ178mm CG STEER rotary steering system after a breakage accident, which can effectively avoid inaccurate weighing data caused by high downhole friction, ensure that the male and female cones can effectively enter or fit the broken fish, effectively retrieve the fish, avoid on-site modification of the male and female cones and selection errors, effectively shorten the accident handling cycle and reduce economic losses, and achieve safe, fast and effective retrieval of the broken φ178mm CG STEER rotary steering system.

[0003] Chinese patent application number "CN20211485678.X" entitled "Retrieving Device, Drill String Assembly, and Retrieving Method" provides a retrieval method, which includes: lowering a retrieval drill string assembly into the well, stopping the retrieval tube at a predetermined distance from the top of the fish, starting the pump for circulation and recording the pump pressure and the suspended weight of the drill string; stopping the pump after circulation, recording the suspended weight of the drill string again, and slowly rotating and lowering the drill string to guide the fish into the retrieval tube; stopping the rotation after the fish enters the retrieval tube, lowering the drill string so that the fish-dropping connector enters the slips, continuing to lower the drill string until the top surface of the fish-dropping connector passes through the slips, enters the sealing assembly, and abuts against the sealing limit part, then starting the pump to observe the pump pressure change, stopping the pump, and slowly lifting the drill string; if the pump pressure rises and the suspended weight of the drill string exceeds the original suspended weight, it indicates that the retrieval tube has firmly grasped the fish; controlling the lifting speed and lifting weight, continuing to lift the drill string without activating the impactor; if the suspended weight increases to a certain value and then stops increasing further. If the fish has been successfully retrieved, the drill string can be retrieved after the pump is turned on for circulation. If the weight of the fish exceeds the sum of the original weight of the drill string and the weight of the fish, and continues to increase, the fish is stuck. If the fish is stuck, use the impactor to dislodge it. After the fish is dislodged, turn on the pump to circulate and remove air intrusion, then the drill string can be retrieved and the fish can be retrieved. If the water hole of the fish is blocked and circulation is not possible, use a ball to pressurize and open the bypass valve to circulate and remove air intrusion before retrieving the drill string. If repeated tremors fail to release the stuck fish, the pump is activated for flushing. After the pump is activated, the flushing fluid enters the retrieval tube through the drill pipe, then enters the stuck fish through the retrieval tube, and finally returns to the surface through the stuck fish, cleaning away debris between the stuck fish and the wellbore. After flushing, the stuck fish is then trembled again to release it. Once released, the drill string is retrieved, and the stuck fish is retrieved. If the pump circulation is successful, the trembled tool is continued to be used to release the stuck fish. If repeated tremors are ineffective, it indicates that the stuck fish is severely obstructed, and the stuck fish is then removed. However, the method and steps in this application differ from those described above. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to solve one or more of the problems existing in the prior art. For example, one objective of the present invention is to provide a method for safely, quickly, and effectively retrieving a broken φ178mm CG STEER rotary steering system after a breakage accident. This method avoids inaccurate weighing data due to high downhole friction, ensures effective entry or fitting of the male and female cones into the broken system, effectively retrieves the broken system, avoids on-site modification of the male and female cones and selection errors, effectively shortens the accident handling cycle and reduces economic losses. A second objective of the present invention is to provide a retrieval drill bit assembly capable of effectively retrieving a broken φ178mm CG STEER rotary steering system. A third objective of the present invention is to provide a retrieval joint that effectively enhances the strength of the device and facilitates retrieval.

[0005] To achieve the above objectives, the present invention provides a method for retrieving a fish from a rotary steering system breakage accident. This method utilizes a retrieval drill string assembly based on the breakage location of the rotary steering system. The method includes: determining the retrieval drill string assembly based on the breakage location of the rotary steering system and lowering the assembly to a predetermined distance from the top of the fish in the well; starting the pump for circulation; weighing; stopping the pump and stopping the rotation of the drill string; slowly lowering the assembly so that the male cone enters the fish or the female cone catches it; performing a first pump start-up verification; lifting the drill string, limiting the torque of the top drive device and rotating the drill string to create a connection, slowly releasing the torque of the top drive device; limiting the torque of the top drive device and rotating the drill string to secure the connection, slowly releasing the torque of the top drive device; limiting the torque of the top drive device and rotating the drill string to secure the connection a second time, slowly releasing the torque of the top drive device, performing a second pump start-up verification; stopping the pump, slowly lifting the assembly, and retrieving the fish; wherein, if the water hole of the fish is blocked, causing the pump circulation to be obstructed, a ball is dropped to pressurize and open the bypass valve to circulate the drilling fluid.

[0006] According to one or more exemplary embodiments of one aspect of the present invention, the weighing may include: recording the displacement and pump pressure in the pump-on state, the suspended weight of the drill string being lifted at a constant speed, the suspended weight of the drill string being lowered at a constant speed, the torque value and suspended weight when rotating the drill string at a speed of 7-15 rpm / min when lifting and lowering are stopped, the torque value and suspended weight when rotating the drill string at a speed of 7-15 rpm / min to lift at a constant speed, and the torque value and suspended weight when rotating the drill string at a speed of 7-15 rpm / min to lower at a constant speed; and recording the suspended weight of the drill string being lifted at a constant speed in the pump-off state, the suspended weight of the drill string being lowered at a constant speed, the torque value and suspended weight when rotating the drill string at a speed of 7-15 rpm / min when lifting and lowering are stopped, the torque value and suspended weight when rotating the drill string at a speed of 7-15 rpm / min to lift at a constant speed, and the torque value and suspended weight when rotating the drill string at a speed of 7-15 rpm / min to lower at a constant speed.

[0007] According to one or more exemplary embodiments of one aspect of the present invention, the first pump start verification may include: starting the pump and observing the pump pressure change; if the discharge volume is the same as that at the time of weighing and the pump pressure rises, or the discharge volume is lower than that at the time of weighing and the pump pressure remains unchanged, it indicates that the male cone has entered the fish or the female cone has been fitted into the fish; if the pump pressure does not rise, it indicates that the male cone has not entered the fish or the female cone has not been fitted into the fish.

[0008] According to one or more exemplary embodiments of one aspect of the present invention, the second pump start verification may include: before the second pump start verification, slowly releasing the torque of the top drive device; starting the drilling pump, and after the outlet returns normally, observing the pump pressure change; if the displacement is the same as when weighing and the pump pressure rises, or the displacement is lower than when weighing and the pump pressure remains unchanged, it indicates that the male or female cone has firmly anchored the fish.

[0009] According to one or more exemplary embodiments of one aspect of the present invention, in the first pump start verification, when the male cone has not entered the fish or the female cone has not been fitted into the fish: keep the pump running, raise it to less than 5 to 10 kN of the suspended weight when rotating the drill string at a speed of 7 to 15 rpm / min when stopping the raising and lowering, rotate the drill string at a speed of 7 to 15 rpm / min to make the male cone enter the fish or the female cone fit into the fish, and stop the pump and stop rotating the drill string.

[0010] According to one or more exemplary embodiments of one aspect of the present invention, the torque of the top drive device is defined as being greater than 2 kN.m when the drill string is rotated at a speed of 7-15 rpm / min when the pump is stopped and the lifting and lowering are halted in the stopped state; the rotation of the drill string for forming a knot includes: rotating the drill string at a speed of 7-15 rpm / min using the top drive device to form a knot, and during the knot-forming process, maintaining the suspended weight less than 10-15 kN of the suspended weight when the drill string is rotated at a speed of 7-15 rpm / min when the pump is stopped and the lifting and lowering are halted in the stopped state.

[0011] According to one or more exemplary embodiments of one aspect of the present invention, the fastening may include: before fastening, after the torque value of the top drive device reaches a set torque and stops, slowly releasing the torque of the top drive device; limiting the torque of the top drive device and rotating the drill string to fasten, wherein the limited torque of the top drive device is greater than the torque value of rotating the drill string at a speed of 7-15 rpm / min when the pump stops lifting and lowering; the rotation of the drill string to fasten includes rotating the drill string to fasten at a speed of 7-15 rpm / min of the top drive device, and during the fastening period, keeping the suspended weight less than the suspended weight of rotating the drill string at a speed of 7-15 rpm / min when the pump stops lifting and lowering.

[0012] According to one or more exemplary embodiments of one aspect of the present invention, the secondary clamping may include: before clamping, after the torque value of the top drive device reaches a set torque and stops, slowly releasing the torque of the top drive device; limiting the torque of the top drive device and rotating the drill string for secondary clamping, wherein the limited torque of the top drive device is: greater than the torque value when rotating the drill string at a speed of 7-15 rpm / min when the pump stops lifting and lowering; the secondary clamping of the drill string by rotating the drill string at a speed of 7-15 rpm / min using the top drive device, and during clamping, maintaining the suspended weight less than the suspended weight when rotating the drill string at a speed of 7-15 rpm / min when the pump stops lifting and lowering.

[0013] According to one or more exemplary embodiments of one aspect of the present invention, the slow lifting may include: maintaining the lifting speed consistent with the uniform lifting speed during weighing; if the weight of the drill string being lifted exceeds the weight of the drill string being lifted at a uniform speed during weighing while the pump is stopped, or if the increase in the weight of the lifted drill string is less than 100kN and no longer continues to increase, it indicates that the fish has been retrieved; if the weight of the lifted drill string continues to increase, it indicates that the fish is stuck; after the fish is stuck, the drill string is slowly lowered to the weight of the drill string being lowered at a uniform speed during weighing while the pump is stopped, the pump is started and circulated, and after the pump is started, the drilling fluid enters the fish through the water hole of the retrieved drill string, and then returns to the annulus between the fish and the wellbore through the fish and then to the surface, cleaning the debris in the annulus between the fish and the wellbore, limiting the torque of the top drive device, rotating it at a speed of 7 to 15 rpm / min and slowly lifting the drill string.

[0014] In another aspect, the present invention provides a retrieval drill string assembly based on a rotary steering system breakage accident. The drill string assembly can be used to implement the retrieval method based on a rotary steering system breakage accident as described above. The drill string assembly may include a male cone, a double-locking safety joint, a drill string check valve, a bypass valve, a weighted drill pipe, a drilling breaker and drill pipe, or a female cone, a double-locking safety joint, a drill string check valve, a bypass valve, a weighted drill pipe, a drilling breaker and drill pipe, or a male cone, a retrieval joint, a drill string check valve, a bypass valve, a weighted drill pipe, a drilling breaker and drill pipe, or at least one of the following: a male cone, a retrieval joint, a drill string check valve, a bypass valve, a weighted drill pipe, a drilling breaker and drill pipe.

[0015] In another aspect, the present invention provides a retrieval joint for rotary steering system breakage accidents. The retrieval joint can be used to assemble the retrieval drill string assembly based on the rotary steering system breakage accident as described above. The retrieval joint may include an upper joint, a centralizing body, a transition band, a main body, and a lower joint connected in sequence. The upper joint is threadedly connected to the drill string. The upper and lower ends of the centralizing body are chamfered to ensure that the drill string connected to it can be centrally centered. The transition band can enhance the strength of the joint. The lower joint is threadedly connected to the drill string.

[0016] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0017] (1) The retrieval method based on the fall of the rotary guide system provided by the present invention can avoid the inaccurate weighing data caused by the large friction in the well, so as to enable the male cone to effectively enter the fallen fish or the female cone to effectively fit the fallen fish, and effectively retrieve the fallen fish, thereby avoiding the on-site modification of the male or female cone and the selection error.

[0018] (2) The retrieval drill assembly based on the failure of the rotary steering system provided by the present invention avoids the problem of low strength of the retrieval drill assembly due to the large number of joints in the previous drill assembly. It can safely, quickly and effectively retrieve the broken φ178mm CG STEER rotary steering system, avoiding wellbore scrapping caused by the complexity of the accident.

[0019] (3) The salvage method based on the rotary guide system for fish fall accidents provided by the present invention can solve the problem of accident complications and wellbore abandonment caused by the blockage of the water hole of the fallen fish, which leads to the inability to start the pump circulation. It can effectively shorten the accident handling cycle and reduce economic losses. Attached Figure Description

[0020] The above and other objects and / or features of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 A schematic flowchart of a salvage method based on a rotary guide system breakage accident is shown in an exemplary embodiment of the present invention.

[0022] Figure 2 A schematic diagram of the broken section of the rotary guide system in an exemplary embodiment of the present invention is shown;

[0023] Figure 3 A schematic diagram of the structure of a salvage joint based on a rotary guide system breakage accident in an exemplary embodiment of the present invention is shown.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100 - Upper rotating drive shaft magnet ring body, 200 - Upper rotating drive shaft middle retaining ring groove, 300 - Upper rotating drive shaft mandrel body, 400 - Upper rotating drive shaft mandrel lower male thread root, 500 - Lower rotating drive shaft mandrel body, 1 - Upper connector, 2 - Straightening body, 3 - Transition belt, 4 - Body, 5 - Lower connector. Detailed Implementation

[0026] In the following, the salvage method, salvage drill assembly and salvage joint based on the rotary guide system breakage accident of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0027] Exemplary Example 1

[0028] This exemplary embodiment provides a retrieval method based on a rotary steering system breakage accident. The method can be performed using a retrieval drill string assembly based on the rotary steering system breakage accident. The method may include: determining the retrieval drill string assembly according to the breakage location of the rotary steering system, and lowering the retrieval drill string assembly to a predetermined distance from the top of the fish in the well; starting the pump for circulation; weighing; stopping the pump and stopping the rotation of the drill string; slowly lowering the drill string so that the male cone enters the fish or the female cone catches the fish; performing the first pump start verification; lifting the drill string, limiting the torque of the top drive device and rotating the drill string to create a connection, and slowly releasing the torque of the top drive device; limiting the torque of the top drive device and rotating the drill string to close the connection, and slowly releasing the torque of the top drive device; limiting the torque of the top drive device and rotating the drill string to close the connection again, and slowly releasing the torque of the top drive device, performing the second pump start verification; stopping the pump, slowly lifting the drill string, and retrieving the fish; wherein, if the water hole of the fish is blocked, causing the pump circulation to be blocked, a ball is dropped to pressurize and open the bypass valve to circulate the drilling fluid.

[0029] In this exemplary embodiment, as Figure 1 The salvage method shown in the figure for the φ178mm CG STEER rotary guide system breakage accident includes:

[0030] S1. Based on the breakage location of the φ178mm CG STEER rotary guide system, assemble the corresponding salvage assembly. For example... Figure 2 As shown, the breakage location of the rotary guide system may include the upper rotary drive shaft magnet ring body 100, the middle retaining groove 200 of the upper rotary drive shaft, the upper rotary drive shaft spindle body 300, the lower male buckle root 400 of the upper rotary drive shaft spindle, and the lower rotary drive shaft spindle body 500.

[0031] S2. Drilling down. Here, the retrieval drill assembly is lowered to a distance of more than 10 meters from the top of the fallen fish.

[0032] S3. Start the pump to circulate the drilling fluid in the well. Here, the pump displacement can be the same as that used during normal drilling before the φ178mm CG STEER rotary steerable system breaks. In particular, when using the male cone Gz98 for pump circulation, the displacement can be 30-50% of the displacement used during normal drilling, for example, 33%, 37%, 42%, 45%, or 48%. The drilling fluid should be circulated for no less than one and a half cycles. One cycle refers to the time it takes for the drilling fluid to go from entering the drill string water hole, exiting the drill string water hole, and finally returning to the surface in the wellbore annulus. One cycle can also be called a circulation cycle, which is the time required for the drilling fluid to go from being pumped into the wellhead to returning from the wellhead. After removing gas intrusion, the drill string is lowered to 0.5m from the theoretical top of the bottom. During circulation, the drill string is moved by statically lifting and lowering. The distance of moving the drill string can be 1m from the drill string joint of the highest point of the lifting position to the rotary table surface or 0.5m from the theoretical top of the bottom of the lowering position.

[0033] S4. Weighing. Weighing here may include: recording the displacement and pump pressure when the pump is running; the suspended weight of the drill string during uniform lifting and lowering; the torque value and suspended weight when rotating the drill string at a speed of 7–15 rpm / min when lifting and lowering stops; the torque value and suspended weight when rotating the drill string at a speed of 7–15 rpm / min during uniform lifting and lowering; and the torque value and suspended weight when rotating the drill string at a speed of 7–15 rpm / min during uniform lowering. The speed at which the drill string is rotated can be 8 rpm / min, 10 rpm / min, 12 rpm / min, or 14 rpm / min. In addition, the rotation speed during weighing is the same as the rotation speed for subsequent buckling and tightening to ensure the accuracy of the weighing data.

[0034] Here, the weighing method is applicable to the fishing process in deep wells, directional wells, and complex wells. Its purpose is to achieve accurate hook-up of the fishing tool. Due to the high friction during tripping in directional wells, if the weighing data is inaccurate, it is not only difficult to determine from the parameters whether the fishing tool has contacted the top of the fish, but it may also cause excessive pressure, leading to the fishing tool deflection, tip damage, and breakage, thus losing the conditions for fishing and complicating the accident.

[0035] S5. Stop the pump and stop rotating the drill bit.

[0036] S6. Slowly lower the drill string so that the male (female) cone enters (fits) the fish. Here, the drill string can be lowered to a position where the pump is stopped, with a load less than 20-30 kN of the suspended weight of the drill string during uniform lowering.

[0037] S7. Pump Start-up Verification. Here, the first pump start-up verification is performed. This verification includes: starting the pump and observing the pump pressure change. If the displacement is the same as at weighing and the pump pressure rises, or if the displacement is lower than at weighing and the pump pressure remains unchanged, it indicates that the male cone has entered the fish or the female cone has been fitted into the fish. If the pump pressure does not rise, it indicates that the male cone has not entered the fish or the female cone has not been fitted into the fish. When the male cone has not entered the fish or the female cone has not been fitted into the fish: keep the pump running, raise the drill bit to a position less than 5-10 kN of the suspended weight when rotating the drill string at a speed of 7-15 rpm / min during the stop of raising and lowering, and rotate the drill string at a speed of 7-15 rpm / min until the male cone enters the fish or the female cone is fitted into the fish. Then stop the pump and stop rotating the drill string. The rotation speed of the drill string can be 8 rpm / min, 10 rpm / min, 12 rpm / min, or 14 rpm / min.

[0038] S8. Raise the drill string. When raising and lowering the drill string to a position below the pump stop position, rotate the drill string at a speed of 7–15 rpm / min to cover the suspended weight of 5–10 kN. The rotation speed of the drill string can be 8 rpm / min, 10 rpm / min, 12 rpm / min, or 14 rpm / min.

[0039] S9. Limit the torque of the top drive device and rotate the drill string to create a connection. The torque of the top drive device is limited to 2 kN·m greater than the torque value when rotating the drill string at a speed of 7-15 rpm / min when the pump is stopped during lifting and lowering. Creating a connection by rotating the drill string includes: rotating the drill string at a speed of 7-15 rpm / min using the top drive device to create a connection, while maintaining the suspended weight at a speed less than 10-15 kN of the suspended weight when rotating the drill string at a speed of 7-15 rpm / min when the pump is stopped during lifting and lowering. The rotation speed of the drill string can be 8 rpm / min, 10 rpm / min, 12 rpm / min, or 14 rpm / min.

[0040] S10. Slowly release the torque of the top drive unit. When the torque value of the top drive unit reaches the set torque and the circuit comes to a complete stop, slowly release the torque of the top drive unit.

[0041] S11. Limit the torque of the top drive device and rotate the drill string to tighten it. The limited torque of the top drive device is 3 kN.m or 5 kN.m greater than the torque value when rotating the drill string at a speed of 7-15 rpm / min when the pump is stopped during lifting and lowering. Here, when using the male cone drill Gz98 for retrieval, the limited torque of the top drive device can be greater than 3 kN.m greater than the torque value when rotating the drill string at a speed of 7-15 rpm / min when the pump is stopped during lifting and lowering. When using male cone drills Gz168, Gz178, and Mz198 for retrieval, the limited torque of the top drive device can be greater than 5 kN.m greater than the torque value when rotating the drill string at a speed of 7-15 rpm / min when the pump is stopped during lifting and lowering. The drilling tool coupling can be achieved by rotating the drill tool at a speed of 7–15 rpm / min using the top drive device. During coupling, the suspended weight should be kept less than 20–50 kN of the suspended weight when rotating the drill tool at 7–15 rpm / min while the pump is stopped and lowering is in operation. Specifically, when using the male drill bit Gz98 for retrieval, the suspended weight should be kept less than 20 kN of the suspended weight when rotating the drill tool at 7–15 rpm / min while the pump is stopped and lowering is in operation. Similarly, when using male drill bits Gz168, Gz178, and Mz198 for retrieval, the suspended weight should be kept less than 20–50 kN of the suspended weight when rotating the drill tool at 7–15 rpm / min while the pump is stopped and lowering is in operation. The rotation speed can be 8 rpm / min, 10 rpm / min, 12 rpm / min, or 14 rpm / min.

[0042] S12. Slowly release the torque of the top drive unit. When the torque value of the top drive unit reaches the set torque and the circuit comes to a complete stop, slowly release the torque of the top drive unit.

[0043] S13. Limit the torque of the top drive device and rotate the drill string for a second tightening. The limit torque of the top drive device is: greater than the torque value when rotating the drill string at a speed of 7-15 rpm / min when the pump is stopped during lifting and lowering. Here, when using the male cone drill Gz98 for retrieval, the torque value is greater than 3 kN.m when rotating the drill string at a speed of 7-15 rpm / min when the pump is stopped during lifting and lowering. When using the male cone drill Gz168, male cone drill Gz178, and female cone drill Mz198 for retrieval, the torque value is greater than 10 kN.m when rotating the drill string at a speed of 7-15 rpm / min when the pump is stopped during lifting and lowering. The secondary tightening of the rotating drill bit includes tightening the drill bit by rotating it at a speed of 7-15 rpm / min using the top drive device. During the tightening process, the suspended weight can be kept less than 20-30 kN or 50-100 kN of the suspended weight when rotating the drill bit at a speed of 7-15 rpm / min during the pump stop lifting and lowering state. When using the male drill bit Gz98 for retrieval, the suspended weight during the tightening period can be kept less than 20-30 kN of the suspended weight when rotating the drill string at a speed of 7-15 rpm / min while the pump is stopped and the drill string is lowered. Examples of suspended weights are 23 kN, 25 kN, 27 kN, or 29 kN. When using male drill bits Gz168, Gz178, and Mz198 for retrieval, the suspended weight during the tightening period can be kept less than 50-100 kN of the suspended weight when rotating the drill string at a speed of 7-15 rpm / min while the pump is stopped and the drill string is lowered. Examples of suspended weights are 53 kN, 57 kN, 61 kN, 66 kN, 73 kN, 78 kN, 83 kN, 88 kN, 93 kN, or 97 kN. The rotation speed of the drill string can be 8 rpm / min, 10 rpm / min, 12 rpm / min, or 14 rpm / min.

[0044] S14. Slowly release the torque of the top drive unit. Before the second pump start-up verification, slowly release the torque of the top drive unit.

[0045] S15. Pump Start-up Verification. Conduct a second pump start-up verification. Start the drilling pump. After the outlet return is normal, observe the pump pressure change. If the discharge is the same as when weighing and the pump pressure rises, or if the discharge is lower than when weighing and the pump pressure remains unchanged, it indicates that the male or female cone has firmly anchored the fish.

[0046] S16. Stop the pump and slowly lift the drill string. Here, "slowly lifting" can include: maintaining the lifting speed consistent with the uniform lifting speed during weighing. If the weight of the drill string being lifted exceeds the weight of the drill string being lifted at a uniform speed during weighing while the pump is stopped, or if the increase in the weight of the lifted drill string is less than 100kN and stops increasing, it indicates that the drill string has been retrieved. If the weight of the lifted drill string continues to increase, it indicates that the drill string is stuck. After the drill string is stuck, slowly lower the drill string to the weight of the drill string being lowered at a uniform speed during weighing while the pump is stopped. Start the pump for circulation. After starting the pump, the drilling fluid enters the drill string through the water hole of the retrieved drill string, then returns through the drill string to the annulus between the drill string and the wellbore, and then to the surface. Clean the debris in the annulus between the drill string and the wellbore. Limit the torque of the top drive device, rotate it at a speed of 7-15 rpm / min, and slowly lift the drill string. Here, the pump discharge rate can be 50-70% of the drilling fluid discharge rate in step S3 when circulating the well. When using the male cone drill bit Gz98 for fishing, the torque value should be greater than 3 kN.m when rotating the drill string at a speed of 7-15 rpm / min when the pump is stopped and the lifting and lowering are halted. When using the male cone drill bit Gz168, male cone drill bit Gz178, and female cone drill bit Mz198 for fishing, the torque value should be greater than 10 kN.m when rotating the drill string at a speed of 7-15 rpm / min when the pump is stopped and the lifting and lowering are halted. During the lifting of the drill string, the torque value should not exceed the limited top drive device torque value and should be greater than 10 kN of the suspended weight when rotating the drill string at a speed of 7-15 rpm / min during weighing. The drill string should be lifted again only after the torque value and suspended weight have stabilized. The rotation speed of the drill string can be 8 rpm / min, 10 rpm / min, 12 rpm / min, or 14 rpm / min.

[0047] S17. Retrieve the fish. In steps S9 to S17, if the water hole of the fish is blocked, causing the pump circulation to be blocked, the ball is dropped to pressurize and open the bypass valve to circulate the drilling fluid.

[0048] Exemplary Example 2

[0049] This exemplary embodiment provides a retrieval drill string assembly based on a rotary steering system breakage accident. The assembly can be used to implement the retrieval method for a rotary steering system breakage accident as described in Exemplary Embodiment 1. The assembly may include a male cone, a double-knock safety joint, a drill string check valve, a bypass valve, a weighted drill pipe, a drilling breaker, and drill pipe; or a female cone, a retrieval joint, a drill string check valve, a bypass valve, a weighted drill pipe, a drilling breaker, and drill pipe; or a male cone, a retrieval joint, a drill string check valve, a bypass valve, a weighted drill pipe, a drilling breaker, and drill pipe. Here, the weighted drill pipe may be a φ127mm weighted drill pipe, the drilling breaker may be a φ165.1mm drilling breaker, the drill pipe may be a φ127mm drill pipe, the male cone may include male cone Gz178, male cone Gz98, or male cone Gz168, and the female cone may include female cone Mz198.

[0050] In this exemplary embodiment, the method of connecting the double-dock safety connector may include:

[0051] Connect one φ127mm heavy-duty drill pipe and the drill check valve (bypass valve and drill check valve) sequentially from top to bottom and suspend them in the hanger of the top drive unit. Remove the safety pin of the double-drill safety connector. Connect the female thread of the double-drill safety connector to the male thread of the drill check valve and tighten it to the specified torque. Connect the female thread of the male or female taper to the male thread of the double-drill safety connector and tighten it to the specified torque. Install the safety pin of the double-drill safety connector by turning it clockwise to the bottom and then turning it back 1 / 4 to 1 / 2 turn.

[0052] Here, the method of connecting the double-clamp safety connector is applicable to all drill bit assemblies that use double-clamp safety connectors. Its purpose is to prevent the safety pin of the double-clamp safety connector from being sheared off prematurely during the connection with other tools, thereby avoiding the time and economic losses required to replace the safety pin.

[0053] To better understand the above exemplary embodiment 2, it will be further described in detail below with reference to specific examples.

[0054] Example 1

[0055] This example provides a retrieval drill bit assembly based on the breakage of the magnet ring body on the upper rotating drive shaft. The assembly may include: a male taper Gz178, a double-locking safety joint, a drill string check valve, a bypass valve, 6-9 φ127mm heavy-duty drill pipes, 1 φ165.1mm oscillator while drilling, 12-15 φ127mm heavy-duty drill pipes, and φ127mm drill pipe. Here, the retrieval range of the male taper Gz178 is 125-155mm, for example, 127mm, 130mm, 133mm, 138mm, 143mm, 146mm, 149mm, or 153mm. This retrieval range refers to the range of fish inner diameters that this male taper can normally handle when in use.

[0056] In this example, the male taper is Gz178, and the connection type is 4. 1The / 2”IF female thread can be directly connected to the male thread of the lower connector of the double-drill safety connector. The connector outer diameter is φ178mm, with a small annular clearance to the φ215.9mm wellbore. When performing hook-making and retrieval on a non-rotating sleeve, the male cone will not deflect beyond the fish head, preventing it from entering. Because the inner diameter of the upper end face of the non-rotating sleeve is φ140mm, and it has a carbide surface, the length of the male cone hook-making is limited to only 28mm to avoid the influence of the carbide surface on hook-making and retrieval. The retrieval range of the male cone is set to 125-155mm, with a retrieval hook length of 200mm, satisfying the outer diameter and hook-making length of the hook-making part, and effectively avoiding the influence of the non-rotating sleeve's interior on hook-making, achieving precise retrieval. The male cone Gz178 is not only used for retrieval of non-rotating sleeves, but also for retrieval operations of other fish whose inner diameter is within the retrieval range.

[0057] Example 2

[0058] This example provides a retrieval drill string assembly based on the breakage of the retaining ring groove in the middle of the upper rotary drive shaft. The first retrieval trip retrieves the non-rotating sleeve, and the drill string assembly may include: a male taper Gz178, a double-locking safety joint, a drill string check valve, 6-9 φ127mm heavy-duty drill pipes, 1 φ165.1mm drilling rig, 12-15 φ127mm heavy-duty drill pipes, and φ127mm drill pipe. The second retrieval trip retrieves the rotary drive shaft mandrel body, and the drill string assembly may include: a female taper Mz198, a double-locking safety joint, a drill string check valve, 6-9 φ127mm heavy-duty drill pipes, 1 φ165.1mm drilling rig, 12-15 φ127mm heavy-duty drill pipes, and φ127mm drill pipe. Here, the retrieval range of the male cone Gz178 is 125–155 mm, for example, 127 mm, 130 mm, 133 mm, 138 mm, 143 mm, 146 mm, 149 mm, or 153 mm, while the retrieval range of the female cone Mz198 is 95–125 mm, for example, 96 mm, 99 mm, 103 mm, 108 mm, 113 mm, 117 mm, 120 mm, or 123 mm. This retrieval range refers to the range of fish outer diameters that this female cone can normally capture when operating normally.

[0059] In this example, the female cone is Mz198, and the connection type is 4. 1The / 2”IF female thread can be directly connected to the male thread of the lower connector of the double-clamp safety joint. When retrieving the upper rotating drive shaft mandrel body, due to the large annular clearance between the upper rotating drive shaft mandrel body's outer diameter (φ104mm) and the φ215.9mm wellbore, and the smaller annular clearance between the female cone cylinder's outer diameter (φ198mm) and the φ215.9mm wellbore, the fish head can be effectively inserted into the female cone cylinder for retrieval by clipping. The minimum wall thickness at the clipping position is 36.5mm, providing sufficient strength for pressure retrieval due to the fish's rotation, preventing retrieval failure and complications caused by the female cone body's low strength, which could lead to breakage or even collapse. The female cone Mz198 is not only used for retrieving the upper rotating drive shaft mandrel body but can also be used for retrieving other fish with an outer diameter within the retrieval range.

[0060] Example 3

[0061] This example provides a fishing drill assembly for a broken upper rotary drive shaft mandrel. The assembly may include: a male taper Gz98, an integral centering and fishing connector, a drill string check valve, a bypass valve, 6-9 φ127mm heavy-duty drill pipes, one φ165.1mm downhole shock absorber, 12-15 φ127mm heavy-duty drill pipes, and φ127mm drill pipe. Here, the fishing range of the male taper Gz98 can be 30-55mm, for example, 33mm, 37mm, 43mm, 46mm, 49mm, or 53mm. This fishing drill assembly is also applicable to situations where the lower male thread root of the upper rotary drive shaft mandrel breaks off.

[0062] In this example, the male taper is Gz98, the connector outer diameter is φ98mm, it can enter the non-rotating sleeve, and the thread type is 2. 7 The / 8” REG female thread can be directly connected to the male thread of the lower connector of the integral straightening and retrieval joint. The retrieval range is 30-55mm, meeting the requirements for retrieval of the water eye of the upper rotating drive shaft mandrel body. The minimum retrieval inner diameter is 30mm, and it can also handle retrieval conditions when the inner diameter of the water eye is reduced due to the breakage and flash of the upper rotating drive shaft mandrel body. The male taper Gz98 is not only used for retrieval of the water eye of the upper rotating drive shaft mandrel body, but also for retrieval operations of other fish whose inner diameter is within the retrieval range.

[0063] Example 4

[0064] This example provides a retrieval drill string assembly based on the breakage of the lower rotary drive shaft mandrel. The assembly may include: a male taper Gz168, a double-locking safety joint, a drill string check valve, a bypass valve, 6-9 φ127mm heavy-duty drill pipes, one φ165.1mm downhole shock absorber, 12-15 φ127mm heavy-duty drill pipes, and φ127mm drill pipe. Here, the retrieval range of the male taper Gz168 can be 87-115mm, for example, 89mm, 93mm, 99mm, 103mm, 107mm, 112mm, or 114mm.

[0065] In this example, the male taper is Gz168, and the connection type is 4. 1 The female thread of the / 2”IF can be directly connected to the male thread of the lower connector of the double-drill safety joint. The outer diameter of the connector is φ168mm, and the annular space clearance with the φ215.9mm wellbore is small. When the rotating drive shaft mandrel body is being retrieved, there will be no situation where the male cone is deflected and passes over the fish head, resulting in the fish head not being able to enter.

[0066] When a φ178mm CG STEER rotary guide system breaks off, the appropriate salvage combination is selected according to the location of the break. This avoids problems such as incorrect selection of salvage tools, on-site modification of salvage tools, multiple weak points due to multiple variable couplings in the salvage combination, and the salvage tool and mandrel not being on the same axis, causing deflection and inability to enter the fallen fish, which leads to salvage failure and complications.

[0067] To better understand Examples 1-4 above, we will provide a more detailed explanation below with specific application examples.

[0068] Application Example 1

[0069] In response to the case of the upper rotating drive shaft magnet ring breaking off, the fishing drill assembly described in Example 1 was used for retrieval, including: lowering the fishing drill assembly to a well depth of 4139.50m; circulating drilling fluid; weighing, with the following conditions: pump on: displacement 8.6L / s, pump pressure 2.9MPa, lifting suspended weight 900kN, lowering suspended weight 895kN, top drive (i.e., top drive device) speed 10rpm / min, torque 9kN.m, suspended weight 897kN; with pump off: lifting suspended weight 940kN, lowering suspended weight 935kN, top drive speed 10rpm / min, torque 9kN.m, suspended weight 937kN; with pump off, the drill string was lowered to a well depth of 4153.3m to detect the top of the fish, and the suspended weight decreased from 935kN to 919kN; pump on for verification, displacement 8.6L / s, pump pressure 3.1MPa; with pump off, the drill string suspended weight was lifted to... 929kN; Limit the top drive torque to 11kN.m, speed to 10rpm / min, torque increases from 0 to 11kN.m and stops (maintaining suspended weight at 929kN during rotation), release torque; lower the suspended weight to 895kN, limit the top drive torque to 14kN.m, speed to 10rpm / min, torque increases from 0 to 14kN.m and stops (maintaining suspended weight at 895kN during rotation), release torque; lower the suspended weight to 839kN, limit the top drive torque to 19kN.m, speed to 10rpm / min, torque increases from 0 to 17kN.m and then decreases to 12kN.m (maintaining suspended weight at 839kN during rotation), release torque; pump start verification, displacement 8.6L / s, pump pressure 3.3MPa, pump stop, lift the drill string, lifting the suspended weight from 839kN to 945kN, retrieve the drill string, successfully retrieve the fallen fish.

[0070] Application Example 2

[0071] In response to the case of the broken retaining ring groove in the middle of the upper rotary drive shaft, the fishing drill assembly described in Example 2 was used for fishing, including: lowering the drill assembly used for the first fishing trip of the non-rotating sleeve to a well depth of 3183.07m; circulating drilling fluid; weighing, with the following conditions: pump start-up: displacement 16.2L / s, pump pressure 4.4MPa, lifting suspended weight 890kN, lowering suspended weight 860kN, top drive speed 10rpm / min, torque 1.5~2kN.m, suspended weight 870kN; with pump stop-up: lifting suspended weight 920kN, lowering suspended weight 880kN, top drive speed 10rpm / min, torque 1.5~2kN.m, suspended weight 900kN; with pump stop-up, the drill assembly was lowered to a well depth of 3197.20m to detect the top of the fish, and the suspended weight was lowered from 880kN. The pressure was reduced to 852 kN; pump start-up verification showed a displacement of 16.2 L / s and a pump pressure of 5.2 MPa; the pump was stopped and the suspended weight was raised to 890 kN; the top drive torque was limited to 4 kN.m, and the speed was 10 rpm / min. The torque increased from 0 to 4 kN.m and then stopped (the suspended weight was maintained at 890 kN during rotation), releasing the torque; the suspended weight was lowered to 855 kN, the top drive torque was limited to 7 kN.m, and the speed was 10 rpm / min. The torque increased from 0 to 7 kN.m and then stopped (the suspended weight was maintained at 855 kN during rotation), releasing the torque; the suspended weight was lowered to 803 kN, the top drive torque was limited to 12 kN.m, and the speed was 10 rpm / min. The torque increased from 0 to 7 kN.m and then decreased to 2.3 kN.m (the suspended weight was maintained at 803 kN during rotation), releasing the torque. Torque release; pump start verification, displacement 16.2 L / s, pump pressure 5.9 MPa, pump stop, drill string lifted, suspended weight increased from 803 kN to 967 kN and then decreased to 923 kN, drill string retrieved, non-rotating sleeve successfully retrieved; second trip drill string assembly lowered to well depth 3186.21 m; drilling fluid circulated; weighing, with pump on: displacement 25.4 L / s, pump pressure 13.6 MPa, suspended weight 820 kN lifted, suspended weight 800 kN lowered, top drive speed 10 rpm / min, torque 1.7–2 kN.m, suspended weight 810 kN; with pump off: suspended weight 870 kN lifted, suspended weight 850 kN lowered, top drive speed 10 rpm / min, torque 1.7–2 kN.m, suspended weight 860 kN; stop The drill string was lowered to a depth of 3197.85m and the top of the fish was detected. The suspended weight decreased from 850kN to 830kN. The pump was started for verification, with a displacement of 25.4L / s and a pump pressure of 14.3MPa. The pump was stopped and the suspended weight was raised to 846kN. The top drive torque was limited to 4kN.m, and the rotation speed was 10rpm / min. The torque was increased from 0 to 4kN.m and then stopped (the suspended weight was maintained at 846kN during rotation), and the torque was released. The suspended weight was lowered to 815kN. The top drive torque was limited to 7kN.m, and the rotation speed was 10rpm / min. The torque was increased from 0 to 7kN.m and then stopped (the suspended weight was maintained at 815kN during rotation), and the torque was released. The suspended weight was lowered to 760kN. The top drive torque was limited to 12kN.m, and the rotation speed was 10rpm / min. The torque increased from 0 to 9kN.The torque was released when the weight dropped to 2 kN·m (maintaining a suspended weight of 760 kN during rotation); the pump was started for verification, with a displacement of 20.0 L / s and a pump pressure of 13.9 MPa. The pump was then stopped, and the drill string was lifted. The suspended weight increased from 760 kN to 900 kN and then decreased to 885 kN. The drill string was retrieved, and all the fish were successfully recovered.

[0072] Application Example 3

[0073] In response to the case of the upper rotary drive shaft mandrel breaking off, the retrieval drilling tool assembly described in Example 3 was used for retrieval, including: lowering the retrieval drilling tool assembly to a well depth of 4220.16m; circulating drilling fluid; weighing, with the following parameters in the pump-on state: displacement 5.2L / s, pump pressure 6.1MPa, lifting suspended weight 1400kN, lowering suspended weight 1360kN, top drive speed 10rpm / min, torque 7~8kN.m, suspended weight 1380kN; with the pump stopped state: lifting suspended weight 142kN. 0 kN, suspended weight 1380 kN, top drive speed 10 rpm / min, torque 7.0~8.0 kN.m, suspended weight 1400 kN; pump stopped, drill string lowered to a depth of 4230.95 m, fish head detected, suspended weight decreased from 1380 kN to 1362 kN; pump started for verification, displacement 5.2 L / s, pump pressure 6.1 MPa; pump stopped, suspended weight raised to 1393 kN; top drive torque limited to 10 kN.m, speed 10 rpm / min, torque increased from 0 to 9 The torque was reduced from 0.2 kN.m to 7-8 kN.m, releasing the torque. Pump start-up verification showed a displacement of 5.2 L / s and a pump pressure of 6.7 MPa. The pump was stopped, and the suspended weight was lowered to 1389 kN. The top drive torque was limited to 10 kN.m at a speed of 10 rpm / min. The torque increased from 0 to 10 kN.m and then stopped (maintaining the suspended weight at 1389 kN during rotation), releasing the torque. The suspended weight was lowered to 1380 kN, and the torque was set to 11 kN.m at a speed of 10 rpm / min. The torque increased from 0 to... The torque was released after the load was stopped at 11 kN.m (the suspended weight was maintained at 1380 kN during rotation); the suspended weight was maintained at 1380 kN, the top drive torque was limited to 11 kN.m, the rotation speed was 10 rpm / min, the torque increased from 0 to 11 kN.m and then decreased to 8-10 kN.m; the torque was released; the pump was started for verification, the displacement was 5.2 L / s, the pump pressure was 6.7 MPa, the pump was stopped, the drill string was lifted, the suspended weight increased from 1380 kN to 1435 kN, the drill string was retrieved, and the fish was successfully retrieved.

[0074] Application Example 4

[0075] In the case of the lower rotary drive shaft mandrel breaking off, the retrieval drilling tool assembly described in Example 4 is used for retrieval, including: lowering the retrieval drilling tool assembly to a well depth of 4289.19m; circulating drilling fluid; weighing, with the following parameters in the pump-on state: displacement 16.3L / s, pump pressure 7.6MPa, lifting suspended weight 1430kN, lowering suspended weight 1330kN, top drive speed 10rpm / min, torque 6kN.m, suspended weight 13 80kN; In pump-stop condition: lifting suspended weight 1460kN, lowering suspended weight 1360kN, top drive speed 10rpm / min, torque 6kN.m, suspended weight 1410kN; pump-stopped, drill string lowered to well depth 4300.23m, fish head detected, suspended weight decreased from 1360kN to 1337kN; pump start-up verification, displacement 16.3L / s, pump pressure 8.2MPa; pump-stopped, drill string lifting suspended weight to 1400kN. N; The top drive torque is limited to 8 kN.m, and the rotation speed is 10 rpm / min. The torque increases from 0 to 8 kN.m and then stops (the suspended weight is maintained at 1400 kN during rotation), releasing the torque; the suspended weight is lowered to 1370 kN, the top drive torque is limited to 11 kN.m, and the rotation speed is 10 rpm / min. The torque increases from 0 to 11 kN.m and then stops (the suspended weight is maintained at 1370 kN during rotation), releasing the torque; the suspended weight is lowered to 1320 kN, the top drive torque is limited to 16 kN.m, and the rotation speed is 10 rpm / min. The torque increases from 0 to 15 kN.m and then decreases to 12 kN.m without stopping (the suspended weight is maintained at 1320 kN during rotation), releasing the torque; pump start verification, displacement 16.3 L / s, pump pressure 8.4 MPa, pump stop, drill string is raised, suspended weight increases from 1430 kN to 1450 kN, drill string is retrieved, and the fallen fish is successfully retrieved.

[0076] Exemplary Example 3

[0077] This exemplary embodiment provides a salvage joint for a rotary guide system breakage accident, wherein the salvage joint may be an integral righting salvage joint.

[0078] like Figure 3 As shown, the salvage joint may include an upper joint 1, a straightening body 2, a transition zone 3, a body 4, and a lower joint 5 connected in sequence.

[0079] The upper connector 1 is threadedly connected to the drill bit, the upper and lower ends of the centering body 2 are chamfered so that the drill bit connected to it can be centered, the transition zone 3 can enhance the strength of the connector, and the lower connector 5 is threadedly connected to the drill bit.

[0080] In this exemplary embodiment, the upper connector 1 has an outer diameter of φ168mm and a length of 230mm, and is internally provided with a female thread, with a thread type 4. 1The / 2”IF connector can be directly connected to a φ168mm drill string check valve, providing sufficient operating space for wellhead connection and disconnection of drill strings while allowing for thread repair, thus extending service life and improving efficiency. The centralizer 2 has an outer diameter of φ202mm and a length of 150mm. Both the upper and lower surfaces of the centralizer are chamfered, enabling it to center and stabilize the fishing tools connected to it, enhancing the stability of the entire fishing assembly. It also allows for smooth passage through casing shoes and wellhead blowout preventers during tripping operations. For well sections with poor tool and wellbore quality. The transition zone 3 has an outer diameter of φ120mm and a length of 350mm, enhancing the overall tool strength. The body 4 has an outer diameter of φ98mm and a length of 1200mm, allowing the retrieval tool to enter the non-rotating sleeve of the rotary guide system to retrieve the water eye of its drive shaft mandrel, without being limited by the tool's inner or outer diameter, thus meeting the conditions for retrieving the broken upper rotary drive shaft mandrel body and the broken root of the lower male thread of the upper rotary drive shaft mandrel. The lower connector 5 has a male thread, thread type 2. 7 / 8”REG can be directly connected to the male taper Gz98, avoiding the increase of weak points in the fishing drill assembly caused by adding a variable thread connector.

[0081] In this exemplary embodiment, the integral centering and fishing connector is an auxiliary tool connected to the fishing string. Installed on the fishing tool, it transmits torque and withstands various complex stresses together with the string. Its maximum outer diameter is close to the maximum outer diameter of the φ178mm CG STEER rotary steerable system. The first 2 meters of the centering section are highly rigid, closely matching the outer diameter and rigidity of the rotary steerable drill string assembly. This ensures the male cone Gz98 is centered and not easily misaligned, allowing it to smoothly enter the non-rotating sleeve and reach the root of the male thread at the lower part of the upper rotary drive shaft mandrel for stable threading and connection, avoiding the risk of further deterioration downhole due to excessively long fishing time. This integral centering and fishing connector can not only be used in φ215.9mm wellbores, but can also be manufactured into corresponding auxiliary fishing tools according to the wellbore size and the outer diameter of the fish.

[0082] In summary, the retrieval method based on the fall of the rotary steering system in this invention is applicable to the retrieval operation of the φ178mm CGSTEER rotary steering system. Its advantages are that it allows the retrieval tool to smoothly enter or fit into the directional well section and retrieve the fallen fish, avoiding the complications caused by the difficulty of the retrieval tool entering the fish's head, prolonged pump operation and rotation of the fish's head causing damage to the retrieval tool, and the blockage of the water hole of the fallen fish causing the pump to circulate poorly. It can further reduce accident losses and shorten the accident handling cycle.

[0083] Although the invention has been described above in conjunction with exemplary embodiments, those skilled in the art will understand that various modifications and changes can be made to the exemplary embodiments of the invention without departing from the spirit and scope defined by the claims.

Claims

1. A salvage method based on a rotary guide system breakage accident, characterized in that, The method involves using a salvage drill assembly based on a rotary steering system breakage accident for salvage operations. The method includes: Determine the retrieval drill assembly based on the location where the rotary steering system breaks off, and lower the retrieval drill assembly to a predetermined distance from the top of the fish that fell into the well. Start the pump for circulation; perform weighing; Stop the pump and stop rotating the drill bit; Slowly lower the cone so that the male cone enters the fish or the female cone slips into the fish; Conduct the first pump start-up verification; Lift the drill string, limit the torque of the top drive device and rotate the drill string to create a thread, then slowly release the torque of the top drive device. Limit the torque of the top drive unit and rotate the drill string to tighten it, then slowly release the torque of the top drive unit. Limit the torque of the top drive device and rotate the drill string to tighten it a second time. Slowly release the torque of the top drive device and perform a second pump start-up verification. Stop the pump, slowly lift the fish out; among them, If the water inlet of the well is blocked, preventing the pump from circulating properly, then the bypass valve should be opened to circulate the drilling fluid by dropping a ball to build up pressure.

2. The salvage method for a rotary guide system breakage accident according to claim 1, characterized in that, The weighing includes: Record the displacement and pump pressure when the pump is running, the suspended weight of the drill string when it is lifted at a constant speed, the suspended weight of the drill string when it is lowered at a constant speed, the torque value and suspended weight when the drill string is rotated at a speed of 7-15 rpm / min when it stops lifting and lowering, the torque value and suspended weight when the drill string is lifted at a constant speed when it is rotated at a speed of 7-15 rpm / min, and the torque value and suspended weight when the drill string is lowered at a constant speed when it is rotated at a speed of 7-15 rpm / min. Record the suspended weight of the drill string when it is being pulled up at a constant speed and when it is being lowered at a constant speed, the torque value and suspended weight when the drill string is rotated at a speed of 7-15 rpm / min when it stops pulling up and lowering, the torque value and suspended weight when the drill string is being pulled up at a constant speed and when it is being lowered at a constant speed and when it is being lowered at a constant speed and when the pump is stopped.

3. The salvage method based on a rotary guide system breakage accident according to claim 1, characterized in that, The first pump start-up verification includes: Turn on the pump and observe the pump pressure change. If the discharge volume is the same as when weighing and the pump pressure rises, or if the discharge volume is lower than when weighing and the pump pressure remains unchanged, it means that the male cone has entered the fish or the female cone has been fitted into the fish. If the pump pressure does not rise, it means that the male cone has not entered the fish or the female cone has not been fitted into the fish.

4. The salvage method based on a rotary guide system breakage accident according to claim 1, characterized in that, The second pump start-up verification includes: Before the second pump start-up verification, slowly release the torque of the top drive unit; After turning on the drilling pump and the outlet return is normal, observe the pump pressure change. If the discharge rate is the same as when weighing and the pump pressure rises, or if the discharge rate is lower than when weighing and the pump pressure remains unchanged, it indicates that the male or female cone has firmly anchored the fish.

5. The salvage method based on a rotary guide system breakage accident according to claim 3, characterized in that, In the first pump start-up verification, when the male cone has not entered the fish or the female cone has not been fitted into the fish: keep the pump running, raise it to a level less than 5-10 kN of the suspended weight when rotating the drill string at a speed of 7-15 rpm / min when stopping the raising and lowering, rotate the drill string at a speed of 7-15 rpm / min to make the male cone enter the fish or the female cone fit into the fish, then stop the pump and stop rotating the drill string.

6. The salvage method based on a rotary guide system breakage accident according to claim 1, characterized in that, The torque of the top drive device is greater than the torque value of the drill bit when it is rotated at a speed of 7-15 rpm / min when the pump is stopped and the lifting and lowering are stopped, which is 2 kN.m greater than the torque value of the drill bit when it is rotated at a speed of 7-15 rpm / min when the pump is stopped. The rotating drill bit creation includes: rotating the drill bit at a speed of 7-15 rpm / min using the top drive device to create the connection, and keeping the suspended weight less than 10-15 kN of the suspended weight when rotating the drill bit at a speed of 7-15 rpm / min when the pump is stopped and the lifting and lowering are stopped in the off-state.

7. The salvage method based on a rotary guide system breakage accident according to claim 1, characterized in that, The fastener includes: Before engaging, once the torque value of the top drive device reaches the set torque and comes to a stop, the torque of the top drive device is slowly released. The torque of the top drive device is limited and the drill string is rotated to lock it. The torque of the top drive device is greater than the torque value of 3 kN.m or 5 kN.m when the drill string is rotated at a speed of 7-15 rpm / min when the pump stops lifting and lowering in the stopped state. The rotating drill bit fastening includes rotating the drill bit at a speed of 7-15 rpm / min using the top drive device. During the fastening period, the suspended weight is kept less than 20-50 kN of the suspended weight when rotating the drill bit at a speed of 7-15 rpm / min when the pump is stopped and the lifting and lowering are stopped.

8. The salvage method based on a rotary guide system breakage accident according to claim 1, characterized in that, The secondary fastening includes: Before engaging, once the torque value of the top drive device reaches the set torque and comes to a stop, the torque of the top drive device is slowly released. The torque of the top drive device is limited and the drill string is rotated to tighten the connection twice. The torque of the top drive device is greater than the torque value of 3 kN.m or 10 kN.m when the drill string is rotated at a speed of 7-15 rpm / min when the pump stops lifting and lowering. The secondary tightening of the rotating drill bit includes tightening the drill bit by rotating it at a speed of 7-15 rpm / min using the top drive device. During the tightening period, the suspended weight is kept less than 20-30 kN or 50-100 kN of the suspended weight when rotating the drill bit at a speed of 7-15 rpm / min during the pump stop lifting and lowering state.

9. The salvage method based on a rotary guide system breakage accident according to claim 1, characterized in that, The slow lifting includes: maintaining the lifting speed consistent with the uniform lifting speed during weighing; if the weight of the drill string being lifted exceeds the weight of the drill string being lifted at a uniform speed during weighing when the pump is stopped, or if the increase in the weight of the lifted drill string is less than 100kN and no longer continues to increase, it means that the fish has been caught; if the weight of the lifted drill string continues to increase, it means that the fish is stuck. After the fish gets stuck, the drill string is slowly lowered until it is suspended under the weight of the pump while it is being weighed. The pump is then turned on to circulate the fluid. After the pump is turned on, the drilling fluid enters the fish through the water hole of the fishing drill string, and then returns to the annulus between the fish and the wellbore through the fish before reaching the surface. The debris in the annulus between the fish and the wellbore is cleaned. The torque of the top drive device is limited, and the drill string is rotated at a speed of 7-15 rpm / min and slowly lifted.

10. A salvage drill assembly based on a rotary guide system breakage accident, characterized in that, The drill string assembly is used to implement the salvage method based on a rotary steering system breakage accident as described in any one of claims 1-9. The drill string assembly includes a male cone, a double-lock safety joint, a drill string check valve, a bypass valve, a weighted drill pipe, a drilling breaker and drill pipe, and a female cone, a double-lock safety joint, a drill string check valve, a bypass valve, a weighted drill pipe, a drilling breaker and drill pipe, or a male cone, a salvage joint, a drill string check valve, a bypass valve, a weighted drill pipe, a drilling breaker and drill pipe.

11. A salvage joint for a rotary guide system breakage accident, characterized in that, The retrieval joint is used to form the retrieval drill string assembly based on the rotary guide system breakage accident as described in claim 10. The retrieval joint includes an upper joint, a centralizing body, a transition band, a main body, and a lower joint connected in sequence. The upper joint is threadedly connected to the drill string. The upper and lower ends of the centralizing body are chamfered to ensure that the drill string connected to it can be centrally centered. The transition band can enhance the strength of the joint. The lower joint is threadedly connected to the drill string.

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