Salvage device and method for underground throttler integrating internal salvage and external salvage

Abstract

The invention discloses a downhole throttler salvage device and method integrating internal salvage and external salvage, and relates to the technical field of salvage of downhole throttlers to the ground. The downhole throttler salvage device comprises a connector, and a circular cylinder with an opening in the bottom is fixedly arranged at the bottom of the connector; a center rod which downwards penetrates through an opening of the circular barrel is fixedly arranged in the circular barrel and located on the top wall of the circular barrel, and an alignment ball head is detachably connected to the extending end of the center rod; inner fishing assemblies used for hooking the annular step faces in the fishing necks are arranged on the center rod and located on the left side and the right side of the center rod. Outer salvage assemblies used for hooking the annular boss of the salvage neck are arranged in the circular cylinder and located on the left side and the right side. The downhole throttler fishing tool has the beneficial effects that the downhole throttler can be successfully fished to the ground, and the fishing efficiency of the downhole throttler is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fishing downhole chokes to the ground, in particular to a fishing device and method for downhole chokes integrating internal and external fishing. Background Art

[0002] During the process of downhole oil and gas production, downhole chokes are indispensable. The downhole choke 1 is firmly fixed in the wellbore 2 through processes such as positioning by an anchoring mechanism and sealing by a sealing element. As Figure 1 shown, the installed downhole choke 1 can effectively reduce the downhole oil pressure and improve the liquid-carrying capacity of a single well, thereby ensuring that the downhole oil and gas can be smoothly produced.

[0003] In order to facilitate workers to fish the downhole choke 1 from the wellbore 2 to the ground in the future (the purpose of fishing the downhole choke 1 to the ground is to facilitate workers to clean the choke nozzle inside the downhole choke 1), before installing the downhole choke 1 into the wellbore 2, workers usually fixedly connect a fishing neck 3 to the top port of the downhole choke 1. After installing the fishing neck 3, the downhole choke 1 with the fishing neck 3 is fixed in the wellbore 2, as Figure 2 shown; among them, the structure of the fishing neck 3 is as Figures 3 to 4 shown, it includes a straight cylinder 4, a circular boss 5 fixedly arranged on the outer cylindrical surface of the upper end of the straight cylinder 4. An outer conical surface 6 is provided on the outer edge of the circular boss 5, an inner conical surface 7 is provided in the upper port of the straight cylinder 4, and an annular step surface 8 is provided on the inner wall of the middle part of the straight cylinder 4.

[0004] When the downhole choke 1 has been used for a period of time, the method for workers to fish the downhole choke 1 to the ground through a fishing tool is as follows: Sa. Hang the top end of the fishing tool 10 on the leading end of the wire 9 of the wire unreeling mechanism, and initially place the fishing tool 10 directly above the wellbore 2, as Figure 5 shown. Under the gravity of the fishing tool 10, the wire 9 is in a taut state; then control the power part of the wire unreeling mechanism to rotate forward, and the wire unreeling mechanism gradually unreels the wire 9, and the fishing tool 10 gradually moves downward along the wellbore 2; Sb. When the wire 9 of the wire unreeling mechanism has been unreeled for a certain number of turns, the worker turns off the power part of the wire unreeling mechanism. At this time, the two locking blocks 11 on the fishing tool 10 are just both outside the fishing neck 3, as Figure 6 shown; then introduce a pressurized fluid into the fishing tool 10 through a pressure pump. Under the pressure of the fluid, the two locking blocks 11 of the fishing tool 10 both move towards the fishing neck 3, and then respectively hook on the bottom surfaces of the left and right ends of the circular boss 5 of the fishing neck 3, as Figure 7 shown; The power part of the Sc and the control wire unwinding mechanism performs reverse rotation. The wire is unwound and wound around the wire 9. The wire 9 drives the fishing tool 10 to gradually move upward. The two locking blocks 11 of the fishing tool 10 lift the annular boss 5 upward, thereby driving the fishing neck 3 to move upward. The fishing neck 3 drives the downhole throttle 1 to move upward, and finally the purpose of fishing the downhole throttle 1 to the ground is achieved.

[0005] However, the current cooperation between the fishing tool 10 and the wire unwinding mechanism can fish the downhole throttle 1 to the ground. However, there are still the following technical defects in terms of technology: Since the outer wall of the downhole throttle 1 is firmly attached to the wellbore 2, that is, the frictional force between the outer wall of the downhole throttle 1 and the inner wall of the wellbore 2 is very large. Therefore, when the two locking blocks 11 lift the annular boss 5 of the fishing neck 3 upward, the lifting force to overcome the frictional force between the outer wall of the downhole throttle 1 and the wellbore 2 is all concentrated on the bottom surface of the annular boss 5. And the annular boss 5 has been corroded by the hydrogen sulfide gas underground and has poor fracture resistance. As a result, during the process of lifting the fishing neck 3, the annular boss 5 of the fishing neck 3 breaks, and then the fishing of the downhole throttle 1 fails.

[0006] To solve this problem, it is only possible to frequently adjust the position of the fishing tool 10 so that the two locking blocks 11 of the fishing tool 10 clamp onto the unbroken part of the annular boss 5, thereby fishing the downhole throttle 1 to the ground. Although this can successfully fish the downhole throttle 1 to the ground, it needs to be operated multiple times to fish the downhole throttle 1 to the ground. This undoubtedly increases the fishing time of the downhole throttle 1 and thus reduces the fishing efficiency of the downhole throttle 1.

[0007] Therefore, there is an urgent need for a fishing device and method that can successfully fish the downhole throttle to the ground and greatly improve the fishing efficiency of the downhole throttle. Summary of the Invention

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a fishing device and method for a downhole throttle that integrates internal and external fishing and can successfully fish the downhole throttle to the ground and greatly improve the fishing efficiency of the downhole throttle.

[0009] The purpose of the present invention is achieved through the following technical solutions: A fishing device for a downhole throttle that integrates internal and external fishing includes a joint. A circular cylinder with an opening at the bottom is fixedly provided at the bottom of the joint. A central rod that penetrates downward through the opening of the circular cylinder is fixedly provided on the top wall inside the circular cylinder. A centering ball head is detachably connected to the extending end of the central rod, and the diameter of the centering ball head is equal to the inner diameter of the straight cylinder of the fishing neck; On the central rod and on its left and right sides, internal fishing assemblies are provided for hooking the annular stepped surface inside the fishing neck. The internal fishing assembly on the left side includes a first base fixed on the columnar surface of the central rod, and a first polished rod fixed on the right end surface of the first base. A movable inner slip that can move left and right is slidably sleeved on the first polished rod, and a first horizontal spring is sleeved on the first polished rod. The first horizontal spring is fixed on the first base and the inner slip respectively; A first guide block is fixed on the upper end of the inner slip and is slidably installed in the guide groove of the first base. A first hook block is fixed on the outside of the lower end of the inner slip, and a first conical surface is provided on the outside of the first hook block; In the circular cylinder and on its left and right sides, external fishing assemblies are provided for hooking the annular boss of the fishing neck. The external fishing assembly on the right side includes a second base fixed on the inner wall of the circular cylinder, and a second polished rod fixed on the left end surface of the second base. A movable outer slip that can move left and right is slidably sleeved on the second polished rod, and a second horizontal spring is sleeved on the second polished rod. The second horizontal spring is fixed on the second base and the outer slip respectively; A second guide block is fixed on the upper end of the outer slip and is slidably installed in the guide groove of the second base. A second hook block is fixed on the inside of the lower end of the outer slip, and a second conical surface is provided on the inside of the second hook block.

[0010] A lifting ring for connecting with a wire rope is fixed on the top of the joint.

[0011] External threads are provided on the columnar surface of the lower end of the central rod, and an internal threaded hole is provided on the top surface of the alignment ball head. The internal threaded hole of the alignment ball head is threadedly connected with the external threads of the central rod to be connected to the lower end of the central rod.

[0012] The first conical surface is matched with the internal conical surface of the fishing neck, and the second conical surface is matched with the external conical surface of the fishing neck.

[0013] The inner slip, the first guide block and the first hook block on the right side of the central rod are integrally formed; the outer slip, the second guide block and the second hook block on the right side of the circular cylinder are integrally formed.

[0014] The two internal fishing assemblies are symmetrically arranged about the central rod left and right, and the two external fishing assemblies are symmetrically arranged about the central rod left and right.

[0015] The joint, the circular cylinder and the central rod are coaxially arranged, and the outer diameter of the circular cylinder is smaller than the inner diameter of the wellbore.

[0016] A fishing method for a downhole throttle that integrates internal and external fishing includes the following steps: S1. Bind and fix the sling of the fishing device to the head end of the wire of the wire unwinding mechanism. Initially place the fishing device directly above the wellbore. Under the gravity of the joint, circular cylinder, and central rod of the fishing device, the wire is in a taut state. Then, control the power part of the wire unwinding mechanism to rotate forward, and the wire unwinding mechanism gradually unwinds the wire, and the fishing device gradually moves downward along the wellbore. S2. As the fishing device continues to be lowered, the spherical surface of the alignment ball head first comes into preliminary contact with the inner conical surface of the fishing neck. Subsequently, under the action of the gravity load of the joint, circular cylinder, and central rod, the alignment ball head moves downward through the inner conical surface and enters the fishing neck. At this time, the joint, circular cylinder, central rod, and fishing neck are on the same vertical line. S3. As the fishing device continues to be lowered, the first conical surfaces of the first hook blocks of the two inner fishing components both come into contact with the inner conical surface of the fishing neck. Subsequently, under the action of the gravity load of the joint, circular cylinder, and central rod, the inner conical surface of the fishing neck gradually pushes the first hook block inward, and the first hook block drives the inner slip along the first polished rod to move inward gradually, and the inner slip gradually compresses the first horizontal spring. When the first hook block of the inner fishing component moves downward through the inner conical surface of the fishing neck, the first hook block, inner slip, and the compressed first horizontal spring all remain stationary in the horizontal direction. S4. As the fishing device continues to be lowered, the second conical surfaces of the second hook blocks of the two outer fishing components both come into contact with the outer conical surface of the annular boss of the fishing neck. Subsequently, under the action of the gravity load of the joint, circular cylinder, and central rod, the outer conical surface of the annular boss gradually pushes the second hook block outward, and the second hook block drives the outer slip along the second polished rod to move outward gradually, and the outer slip gradually compresses the second horizontal spring. When the second hook block of the outer fishing component moves downward through the outer conical surface of the annular boss, the second hook block, outer slip, and the compressed second horizontal spring all remain stationary in the horizontal direction. S5. As the fishing device continues to be lowered, the first hook block of the inner fishing component just moves downward through the annular step surface in the fishing neck. Under the elastic restoring force of the compressed first horizontal spring, the inner slip moves outward along the first polished rod, and the inner slip drives the first hook block to move outward synchronously, so that the first hook block moves to directly below the annular step surface of the fishing neck. At the same time, the second hook block of the outer fishing component also just moves downward through the annular boss of the fishing neck. Under the elastic restoring force of the compressed second horizontal spring, the outer slip moves inward along the second polished rod, and the outer slip drives the second hook block to move inward synchronously, so that the second hook block moves to directly below the annular boss of the fishing neck. S6. Control the power part of the wire unwinding mechanism to reverse. The wire is unwound and wound around the wire reel, and the wire lifts the fishing device upward. At this time, the first hook block of the inner fishing component applies part of the lifting force to the annular step surface of the fishing neck. At the same time, the second hook block of the outer fishing component applies the other part of the lifting force to the annular boss of the fishing neck, thereby driving the fishing neck to move upward. The fishing neck then drives the downhole throttle to move upward, and finally achieves the purpose of fishing the downhole throttle to the ground.

[0017] The present invention has the following advantages: It can successfully fish the downhole throttle to the ground and greatly improve the fishing efficiency of the downhole throttle. Description of the Drawings

[0018] Figure 1 Schematic diagram of the downhole throttle fixed in the wellbore; Figure 2 Schematic diagram of the downhole throttle with a fishing neck fixed in the wellbore; Figure 3 Schematic diagram of the structure of the fishing neck; Figure 4 For Figure 3 Main sectional schematic diagram; Figure 5 Schematic diagram of the prior art fishing tool initially placed directly above the wellbore; Figure 6 Schematic diagram of both locking blocks on the prior art fishing tool being outside the fishing neck; Figure 7 Schematic diagram of the two locking blocks of the fishing tool respectively hooked on the annular boss of the fishing neck; Figure 8 Schematic diagram of the structure of the present invention; Figure 9 For Figure 8 Main sectional schematic diagram; Figure 10 Schematic diagram of the connection between the central rod and the alignment ball head; Figure 11 Schematic diagram of the structure of the inner fishing component on the left side; Figure 12 For Figure 11 Connection schematic diagram of the first guide block, the first hook block and the inner slip in Figure 13 For Figure 12 Main sectional schematic diagram; Figure 14 Schematic diagram of the structure of the outer fishing component on the right side; Figure 15 For Figure 14 Connection schematic diagram of the second guide block, the second hook block and the outer slip in Figure 16 is Figure 15 the main sectional view; Figure 17 is the schematic diagram of initially placing the fishing device directly above the wellbore; Figure 18 is the schematic diagram of the alignment ball head passing through the inner conical surface downward and entering the fishing neck; Figure 19 is the schematic diagram in which the first conical surfaces of the first hook blocks of the two inner fishing components are in contact with the inner conical surface of the fishing neck; Figure 20 is the schematic diagram of the first hook block of the inner fishing component passing through the inner conical surface of the fishing neck downward; Figure 21 is the schematic diagram in which the second conical surfaces of the second hook blocks of the two outer fishing components are in contact with the outer conical surface of the annular boss of the fishing neck; Figure 22 is the schematic diagram of the second hook block of the outer fishing component passing through the outer conical surface of the annular boss of the fishing neck downward; Figure 23 is the schematic diagram of the first hook block of the inner fishing component passing through the annular step surface inside the fishing neck downward; Figure 24 is the schematic diagram of the first hook block moving to directly below the annular step surface of the fishing neck; In the figure: 1 - downhole throttle, 2 - wellbore, 3 - fishing neck, 4 - straight tube, 5 - annular boss, 6 - outer conical surface, 7 - inner conical surface, 8 - annular step surface, 9 - wire, 10 - fishing tool, 11 - locking block; 12 - joint, 13 - circular tube, 14 - central rod, 15 - alignment ball head; 16 - inner fishing component, 17 - first base, 18 - first polished rod, 19 - inner slip, 20 - first horizontal spring, 21 - first guide block, 22 - first hook block, 23 - first conical surface; 24 - outer fishing component, 25 - second base, 26 - second polished rod, 27 - outer slip, 28 - second horizontal spring, 29 - second guide block, 30 - second hook block, 31 - second conical surface, 32 - sling. Detailed implementation manners

[0019] The following further describes the present invention with reference to the accompanying drawings. The protection scope of the present invention is not limited to the following: As Figures 8 to 16As shown in the figure, a fishing device for a downhole throttle that integrates internal and external fishing. It includes a joint 12. At the top of the joint 12, a lifting ring 32 for connecting with a wire rope is fixedly installed. At the bottom of the joint 12, a circular cylinder 13 with an opening at the bottom is fixedly installed. Inside the circular cylinder 13 and on its top wall, a central rod 14 that penetrates downward through the opening of the circular cylinder 13 is fixedly installed. A centering ball head 15 is detachably connected to the extended end of the central rod 14. The diameter of the centering ball head 15 is equal to the inner diameter of the straight cylinder 4 of the fishing neck 3. The joint 12, the circular cylinder 13, and the central rod 14 are coaxially arranged, and the outer diameter of the circular cylinder 13 is smaller than the inner diameter of the wellbore 2. An external thread is provided on the cylindrical surface at the lower end of the central rod 14, and an internal threaded hole is provided on the top surface of the centering ball head 15. The internal threaded hole of the centering ball head 15 is threadedly connected to the external thread of the central rod 14 to be connected to the lower end of the central rod 14.

[0020] On both the left and right sides of the central rod 14, an internal fishing assembly 16 for hooking the annular step surface 8 inside the fishing neck 3 is provided. The two internal fishing assemblies 16 are symmetrically arranged about the central rod 14. The left internal fishing assembly 16 includes a first base 17 fixedly installed on the cylindrical surface of the central rod 14, a first optical rod 18 fixedly installed on the right end surface of the first base 17. A movable inner slip 19 that can move left and right is slidably sleeved on the first optical rod 18. A first horizontal spring 20 is sleeved on the first optical rod 18, and the first horizontal spring 20 is fixedly installed on the first base 17 and the inner slip 19 respectively. The upper end of the inner slip 19 is fixedly installed with a first guide block 21. The first guide block 21 is slidably installed in the guide groove of the first base 17. The outer side of the lower end of the inner slip 19 is fixedly installed with a first hook block 22, and a first conical surface 23 is provided on the outer side of the first hook block 22. Inside the circular cylinder 13 and on both the left and right sides, an external fishing assembly 24 for hooking the annular boss 5 of the fishing neck 3 is provided. The two external fishing assemblies 24 are symmetrically arranged about the central rod 14. The right external fishing assembly 24 includes a second base 25 fixedly installed on the inner wall of the circular cylinder 13, a second optical rod 26 fixedly installed on the left end surface of the second base 25. A movable outer slip 27 that can move left and right is slidably sleeved on the second optical rod 26. A second horizontal spring 28 is sleeved on the second optical rod 26, and the second horizontal spring 28 is fixedly installed on the second base 25 and the outer slip 27 respectively. The upper end of the outer slip 27 is fixedly installed with a second guide block 29. The second guide block 29 is slidably installed in the guide groove of the second base 25. The inner side of the lower end of the outer slip 27 is fixedly installed with a second hook block 30, and a second conical surface 31 is provided on the inner side of the second hook block 30.

[0021] The first conical surface 23 cooperates with the inner conical surface 7 of the fishing neck 3, and the second conical surface 31 cooperates with the outer conical surface 6 of the fishing neck 3. The inner slip 19, the first guide block 21 and the first hook block 22 on the right side of the central rod 14 are integrally formed; the outer slip 27, the second guide block 29 and the second hook block 30 on the right side of the circular cylinder 13 are integrally formed.

[0022] A fishing method for a downhole throttle that integrates internal and external fishing, which includes the following steps: S1. Bind and fix the lifting ring 32 of the fishing device to the head end of the wire 9 of the wire unreeling mechanism, and initially place the fishing device directly above the wellbore 2. As shown in the figure, under the gravity of the joint 12, the circular cylinder 13 and the central rod 14 of the fishing device, the wire 9 is in a taut state; then control the power part of the wire unreeling mechanism to rotate forward, and the wire unreeling mechanism gradually unreels the wire 9, and the fishing device gradually moves downward along the wellbore 2. Figure 17 S2. As the fishing device continues to be lowered, the spherical surface of the alignment ball head 15 first comes into preliminary contact with the inner conical surface 7 of the fishing neck 3. Subsequently, under the action of the gravity load of the joint 12, the circular cylinder 13 and the central rod 14, the alignment ball head 15 passes downward through the inner conical surface 7 and enters the fishing neck 3. As shown in the figure, at this time, the joint 12, the circular cylinder 13, the central rod 14 and the fishing neck 3 are on the same vertical line. S3. As the fishing device continues to be lowered, the first conical surfaces 23 of the first hook blocks 22 of the two internal fishing components 16 all come into contact with the inner conical surface 7 of the fishing neck 3. As shown in the figure, subsequently, under the action of the gravity load of the joint 12, the circular cylinder 13 and the central rod 14, the inner conical surface 7 of the fishing neck 3 gradually pushes the first hook block 22 inward, and the first hook block 22 drives the inner slip 19 to move inward along the first polished rod 18, and the inner slip 19 gradually compresses the first horizontal spring 20. The moving direction of the inner slip 19 is as shown by the solid arrow in the figure; when the first hook block 22 of the internal fishing component 16 passes downward through the inner conical surface 7 of the fishing neck 3, as shown in the figure, the first hook block 22, the inner slip 19 and the compressed first horizontal spring 20 all remain stationary in the horizontal direction. Figure 18 S4. As the fishing device continues to be lowered, the second conical surfaces 31 of the second hook blocks 30 of the two external fishing components 24 all come into contact with the outer conical surface 6 of the annular boss 5 of the fishing neck 3. As shown in the figure, S3. As the fishing device continues to be lowered, the first conical surfaces 23 of the first hook blocks 22 of the two internal fishing components 16 all come into contact with the inner conical surface 7 of the fishing neck 3. As shown in the figure, Figure 19 subsequently, under the action of the gravity load of the joint 12, the circular cylinder 13 and the central rod 14, the inner conical surface 7 of the fishing neck 3 gradually pushes the first hook block 22 inward, and the first hook block 22 drives the inner slip 19 to move inward along the first polished rod 18, and the inner slip 19 gradually compresses the first horizontal spring 20. The moving direction of the inner slip 19 is as shown by the solid arrow in the figure; when the first hook block 22 of the internal fishing component 16 passes downward through the inner conical surface 7 of the fishing neck 3, as shown in the figure, Figure 19 the first hook block 22, the inner slip 19 and the compressed first horizontal spring 20 all remain stationary in the horizontal direction. Figure 20 As shown in the figure, the first hook block 22, the inner slip 19 and the first horizontal spring 20 in the compressed state all remain stationary in the horizontal direction. S4. As the fishing device continues to be lowered, the second conical surfaces 31 of the second hook blocks 30 of the two external fishing components 24 all come into contact with the outer conical surface 6 of the annular boss 5 of the fishing neck 3. As shown in the figure, Figure 21As shown, subsequently, under the action of the gravity loading of the joint 12, the circular cylinder 13, and the central rod 14, the outer conical surface 6 of the annular boss 5 gradually pushes the second hook block 30 outwards. The second hook block 30 in turn drives the outer slip 27 to gradually move outwards along the second polished rod 26, and the outer slip 27 gradually compresses the second horizontal spring 28. The movement direction of the outer slip 27 is as shown by the hollow arrow in Figure 21 ; when the second hook block 30 of the outer fishing assembly 24 passes downwards through the outer conical surface 6 of the annular boss 5, as shown by Figure 22 , the second hook block 30, the outer slip 27, and the compressed second horizontal spring 28 all remain stationary in the horizontal direction; S5. As the fishing device continues to be lowered, the first hook block 22 of the inner fishing assembly 16 just passes downwards through the annular step surface 8 in the fishing neck 3, as shown by Figure 23 . Under the action of the elastic restoring force of the compressed first horizontal spring 20, the inner slip 19 moves outwards along the first polished rod 18. The inner slip 19 in turn drives the first hook block 22 to move outwards synchronously. The movement direction of the first hook block 22 is as shown by the solid arrow in Figure 23 , so that the first hook block 22 moves to directly below the annular step surface 8 of the fishing neck 3, as shown by Figure 24 ; Meanwhile, the second hook block 30 of the outer fishing assembly 24 also just passes downwards through the annular boss 5 of the fishing neck 3, as shown by Figure 23 . Under the action of the elastic restoring force of the compressed second horizontal spring 28, the outer slip 27 moves inwards along the second polished rod 26. The outer slip 27 in turn drives the second hook block 30 to move inwards synchronously. The movement direction of the second hook block 30 is as shown by the hollow arrow in Figure 23 , so that the second hook block 30 moves to directly below the annular boss 5 of the fishing neck 3, as shown by Figure 24 ; S6. Control the power part of the wire unreeling mechanism to reverse. The wire unreeling winds up the wire 9. The wire 9 lifts the fishing device upwards. At this time, the first hook block 22 of the inner fishing assembly 16 applies a part of the lifting force to the annular step surface 8 of the fishing neck 3. At the same time, the second hook block 30 of the outer fishing assembly 24 applies another part of the lifting force to the annular boss 5 of the fishing neck 3, thereby driving the fishing neck 3 to move upwards. The fishing neck 3 in turn drives the downhole flow restrictor 1 to move upwards, and ultimately realizes the purpose of fishing the downhole flow restrictor 1 to the ground.

[0023] Among them, from steps S3 to S5, under the action of the gravity loading of the joint 12, the circular tube 13 and the center rod 14, the first hook block 22 of the inner salvage component 16 is adaptively moved to the position directly below the annular step surface 8 of the salvage neck 3, and at the same time, the second hook block 30 of the outer salvage component 24 is adaptively moved to the position directly below the annular boss 5 of the salvage neck 3; and then in step S6, during the lifting process of the downhole choke 1, the first hook block 22 of the inner salvage component 16 applies a part of the lifting force to the annular step surface 8 of the salvage neck 3, and at the same time, the second hook block 30 of the outer salvage component 24 applies another part of the lifting force to the annular boss 5 of the salvage neck 3, that is, the lifting force to overcome the friction between the outer wall of the downhole choke 1 and the wellbore 2 is distributed not only on the annular boss 5 of the salvage neck 3, but also on the annular step surface 8 of the salvage neck 3, compared with the method of using Figures 5 to 7 The salvage method shown does not concentrate all the lifting force to overcome the friction between the outer wall of the downhole throttle 1 and the wellbore 2 on the annular boss 5, thereby effectively avoiding the annular boss 5 corroded by hydrogen sulfide gas from breaking during the lifting process, thereby ensuring that the downhole throttle 1 is successfully salvaged to the ground.

[0024] In addition, since the annular boss 5 of the fishing neck 3 will not break during the fishing process, compared with Figures 5 to 7 The salvaging method shown does not require frequent adjustment of the position of the salvaging assembly for salvaging, and can salvage the downhole choke 1 to the ground at one time, thereby greatly shortening the salvaging time of the downhole choke 1 and greatly improving the salvaging efficiency of the downhole choke 1.

Claims

1. A fishing device for a downhole throttle that combines internal and external fishing, characterized in that: It includes a connector (12). A circular cylinder (13) with an opening at the bottom is fixedly provided at the bottom of the connector (12). A central rod (14) that penetrates downward through the opening of the circular cylinder (13) is fixedly provided inside the circular cylinder (13) and on its top wall. A centering ball head (15) is detachably connected to the extended end of the central rod (14). The diameter of the centering ball head (15) is equal to the inner diameter of the straight cylinder (4) of the fishing neck (3). Inner fishing components (16) for hooking the annular step surface (8) inside the fishing neck (3) are arranged on both the left and right sides of the central rod (14). The inner fishing component (16) on the left side includes a first base (17) fixedly provided on the cylindrical surface of the central rod (14), a first optical rod (18) fixedly provided on the right end surface of the first base (17). An inner slip (19) that can move left and right is slidably sleeved on the first optical rod (18). A first horizontal spring (20) is sleeved on the first optical rod (18), and the first horizontal spring (20) is fixedly provided on the first base (17) and the inner slip (19) respectively. A first guide block (21) is fixedly provided at the upper end of the inner slip (19). The first guide block (21) is slidably installed in the guide groove of the first base (17). A first hook block (22) is fixedly provided on the outer side of the lower end of the inner slip (19). A first conical surface (23) is provided on the outer side of the first hook block (22). Outer fishing components (24) for hooking the annular boss (5) of the fishing neck (3) are arranged on both the left and right sides inside the circular cylinder (13). The outer fishing component (24) on the right side includes a second base (25) fixedly provided on the inner wall of the circular cylinder (13), a second optical rod (26) fixedly provided on the left end surface of the second base (25). An outer slip (27) that can move left and right is slidably sleeved on the second optical rod (26). A second horizontal spring (28) is sleeved on the second optical rod (26), and the second horizontal spring (28) is fixedly provided on the second base (25) and the outer slip (27) respectively. A second guide block (29) is fixedly provided at the upper end of the outer slip (27). The second guide block (29) is slidably installed in the guide groove of the second base (25). A second hook block (30) is fixedly provided on the inner side of the lower end of the outer slip (27). A second conical surface (31) is provided on the inner side of the second hook block (30).

2. The fishing device for a downhole throttle valve integrating internal and external fishing, as claimed in claim 1, wherein: A lifting ring (32) for connecting with a steel wire is fixedly provided at the top of the connector (12).

3. The fishing device for downhole chokes integrating internal and external fishing, as described in claim 2, is characterized in that: External threads are provided on the cylindrical surface of the lower end of the central rod (14). An internal threaded hole is provided on the top surface of the centering ball head (15). The internal threaded hole of the centering ball head (15) is threadedly connected to the external threads of the central rod (14) to be connected to the lower end of the central rod (14).

4. The fishing device for downhole chokes integrating internal and external fishing, as claimed in claim 3, is characterized in that: The first conical surface (23) is matched with the inner conical surface (7) of the fishing neck (3), and the second conical surface (31) is matched with the outer conical surface (6) of the fishing neck (3).

5. The fishing device for a downhole throttle valve integrating internal and external fishing, as described in claim 4, is characterized in that: The inner slips (19), the first guiding block (21) and the first engaging block (22) located on the right side of the central rod (14) are integrally formed; the outer slips (27), the second guiding block (29) and the second engaging block (30) located on the right side of the circular cylinder (13) are integrally formed.

6. The fishing device for a downhole throttle that integrates internal and external fishing, characterized in that: The two inner fishing assemblies (16) are symmetrically arranged about the central rod (14) left and right, and the two outer fishing assemblies (24) are symmetrically arranged about the central rod (14) left and right.

7. The fishing device for downhole chokes integrating internal and external fishing, as claimed in claim 6, wherein: The joint (12), the circular cylinder (13) and the central rod (14) are coaxially arranged, and the outer diameter of the circular cylinder (13) is smaller than the inner diameter of the wellbore (2).

8. A method for fishing an downhole throttle that integrates internal and external fishing, using a fishing device for an downhole throttle that integrates internal and external fishing as described in claim 7, characterized in that: It includes the following steps: S1. Bind and fix the lifting ring (32) of the fishing device to the head end of the steel wire (9) of the steel wire unreeling mechanism, and initially place the fishing device directly above the wellbore (2). Under the gravity of the joint (12), the circular cylinder (13) and the central rod (14) of the fishing device, the steel wire (9) is in a taut state; then control the power part of the steel wire unreeling mechanism to rotate forward, and the steel wire unreeling mechanism gradually unreels the steel wire (9), and the fishing device gradually moves downward along the wellbore (2). S2. As the fishing device continues to be lowered, the spherical surface of the alignment ball head (15) first comes into initial contact with the inner conical surface (7) of the fishing neck (3). Subsequently, under the action of the gravity loading of the joint (12), the circular cylinder (13) and the central rod (14), the alignment ball head (15) moves downward through the inner conical surface (7) and enters the fishing neck (3). At this time, the joint (12), the circular cylinder (13), the central rod (14) and the fishing neck (3) are on the same vertical line. S3. As the fishing device continues to be lowered, the first conical surfaces (23) of the first engaging blocks (22) of the two inner fishing assemblies (16) are all in contact with the inner conical surface (7) of the fishing neck (3). Subsequently, under the action of the gravity loading of the joint (12), the circular cylinder (13) and the central rod (14), the inner conical surface (7) of the fishing neck (3) gradually pushes the first engaging block (22) inward, and the first engaging block (22) drives the inner slips (19) to move gradually inward along the first smooth rod (18), and the inner slips (19) gradually compress the first horizontal spring (20); when the first engaging block (22) of the inner fishing assembly (16) moves downward through the inner conical surface (7) of the fishing neck (3), the first engaging block (22), the inner slips (19) and the compressed first horizontal spring (20) all remain stationary in the horizontal direction. S4. As the fishing device continues to be lowered, the second conical surfaces (31) of the second hook blocks (30) of the two outer fishing components (24) come into contact with the outer conical surfaces (6) of the annular bosses (5) of the fishing neck (3). Subsequently, under the action of the gravity loading of the joint (12), the circular cylinder (13) and the central rod (14), the outer conical surfaces (6) of the annular bosses (5) gradually push the second hook blocks (30) outwards. The second hook blocks (30) drive the outer slips (27) to gradually move outwards along the second polished rod (26), and the outer slips (27) gradually compress the second horizontal spring (28). When the second hook blocks (30) of the outer fishing components (24) pass downwards through the outer conical surfaces (6) of the annular bosses (5), the second hook blocks (30), the outer slips (27) and the compressed second horizontal spring (28) all remain stationary in the horizontal direction. S5. As the fishing device continues to be lowered, the first hook block (22) of the inner fishing component (16) just passes downwards through the annular step surface (8) inside the fishing neck (3). Under the action of the elastic restoring force of the compressed first horizontal spring (20), the inner slips (19) move outwards along the first polished rod (18). The inner slips (19) drive the first hook block (22) to move outwards synchronously, so that the first hook block (22) moves to directly below the annular step surface (8) of the fishing neck (3). At the same time, the second hook block (30) of the outer fishing component (24) also just passes downwards through the annular boss (5) of the fishing neck (3). Under the action of the elastic restoring force of the compressed second horizontal spring (28), the outer slips (27) move inwards along the second polished rod (26). The outer slips (27) drive the second hook block (30) to move inwards synchronously, so that the second hook block (30) moves to directly below the annular boss (5) of the fishing neck (3). S6. Control the power part of the wire unwinding mechanism to reverse, and the wire unwinding winds up the wire (9). The wire (9) lifts the fishing device upwards. At this time, the first hook block (22) of the inner fishing component (16) exerts a part of the lifting force on the annular step surface (8) of the fishing neck (3). At the same time, the second hook block (30) of the outer fishing component (24) exerts the other part of the lifting force on the annular boss (5) of the fishing neck (3), thereby driving the fishing neck (3) to move upwards. The fishing neck (3) drives the downhole throttle (1) to move upwards, and finally the purpose of fishing the downhole throttle (1) to the ground is achieved.

Images