A slip type downhole choke and integrated sand control fishing device

Abstract

The present application relates to the technical fields of throttling device, in particular to a slip type downhole throttling device and integrated sand prevention fishing device, which comprises a winding and unwinding structure, an end cover, a shaft, a slip seat, a slip body, a central pipe, a cone, a rubber tube, a blocking ring, a sand prevention mechanism, an adjusting mechanism and a throttling nozzle, the winding and unwinding structure is located at the rear end of the end cover, the shaft is located at the center of the end cover, the slip body is installed at the front end of the slip seat, the central pipe is sequentially arranged through the rubber tube, the cone, the slip body and the slip seat, the slip seat is connected with the end cover, the shaft is located at the center, the winding and unwinding structure is connected with the shaft, the rubber tube is sleeved outside the central pipe, the blocking ring is installed at the front end of the rubber tube, the adjusting mechanism is located at the right side of the blocking ring, the throttling nozzle is located at the front end of the shaft, through setting three-stage cooperative filtration, the seat sealing effect of the slip is further enhanced while long-term sand prevention.

Description

Technical Field

[0001] This invention relates to the field of throttle technology, specifically a slip-type downhole throttle and an integrated sand control and retrieval device. Background Technology

[0002] A slip-type downhole choke is a downhole tool used in natural gas wells. It is fixed to the inner wall of the tubing by slips, forming a seal with a sealing sleeve. The reduced diameter of the choke nozzle generates a pressure differential, lowering the wellhead pressure and preventing hydrate formation. Its core functions include anchoring, sealing, choking, and sand control. After placement, it requires a retrieval device for recovery. A multi-stage sand control structure (such as sand-control pipes and locking rings) intercepts sand particles, and springs and shear pins enable rapid unsealing and retrieval of the choke, avoiding the negative impacts caused by sand blockage or sleeve deformation in traditional retrieval methods.

[0003] During deployment, the choke is fixed to the wellbore by slips. Over long-term use, the impact of fluid flow and the weight of the choke itself can cause the slips to gradually lose their gripping force or even loosen. Furthermore, traditional downhole chokes are prone to low efficiency due to seal failure under high pressure differential conditions. After seal failure, sand particles in the fluid can easily cause wear on the choke components. For small chokes, once loosened, they will fall downwards and become centered, making them difficult to retrieve.

[0004] To address the aforementioned issues, various solutions have been proposed in the prior art, such as increasing the filtration effect of sand and gravel by adding a filter screen. However, since the fluid flows from bottom to top, the surface of the sand-proof device is easily clogged or damaged by impact after prolonged impact. In this case, sand and gravel can still enter the axial position, thereby clogging the flow channel and even wearing down the components, affecting the normal operation of the throttle.

[0005] Based on this, in order to solve the problem that the faceplate and bottom box are difficult to calibrate due to their non-fixed shapes during the automated assembly of infrared detectors, this invention designs a slip-type downhole throttle and an integrated sand control and retrieval device. Summary of the Invention

[0006] This invention provides a slip-type downhole choke and an integrated sand control and retrieval device, which solves the problem that the choke is easily blocked and impacted by sand and gravel during long-term use, thus affecting the efficiency of the choke. By setting a three-stage synergistic filtration, the sealing effect of the slip is further enhanced while preventing sand in the long term.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention provides a slip-type downhole throttle, comprising a retractable structure, an end cap, a shaft, a slip seat, a slip body, a central tube, a cone, a rubber sleeve, a retaining ring, a sand-control mechanism, an adjusting mechanism, and a throttle nozzle. The retractable structure is located at the rear end of the end cap, the shaft is located at the center of the end cap, the slip body is installed at the front end of the slip seat, the central tube passes sequentially through the rubber sleeve, the cone, the slip body, and the slip seat, the slip seat is connected to the end cap, the shaft is located at the center, the retractable structure is connected to the shaft, the rubber sleeve is sleeved on the outside of the central tube, the retaining ring is installed at the front end of the rubber sleeve, the adjusting mechanism is located to the right of the retaining ring, and the throttle nozzle is located at the front end of the shaft. The sand-control mechanism is installed at the front end of the shaft. When the slip seat pushes the slip body to fix it, the sand-control mechanism drives the adjusting mechanism in the opposite direction to push the retaining ring, and the retaining ring drives the rubber sleeve to lock together.

[0009] The sand-proof mechanism is installed at the bottom of the throttle to prevent sand and gravel from flowing upward from the shaft. At the same time, the sand-proof mechanism, together with the adjustment mechanism, can further fix and seal the throttle under the rapid impact of materials during long-term use, thereby improving the efficiency of the throttle. The throttle nozzle is used to flow materials. A certain pressure difference is formed between the upper and lower parts of the throttle nozzle. The pressure difference makes the throttle seat seal more and more secure.

[0010] Preferably, the launching and retrieving structure includes a launching head, a retrieval head, a launching pin, and a connecting head. The launching head and the retrieval head are both installed at the front end of the shaft, the launching pin is installed between the launching head and the retrieval head, and the connecting head is located at the launching pin.

[0011] By rotating the rope, the dispensing head rotates relative to the connector, and then detaches along the dispensing pin, achieving the effect of convenient installation and detachment.

[0012] Preferably, the sand-proof mechanism includes a transition sleeve, a locking ring sleeve, a sand-proof tube, and a spiral blade. The transition sleeve is installed at the front end of the retaining ring, the locking ring sleeve is installed between the retaining ring and the transition sleeve, the sand-proof tube is installed at the front end of the shaft, and the spiral blade is installed inside the sand-proof tube.

[0013] On the one hand, it reduces the direct impact of sand and gravel on the sand control pipe, thus avoiding damage to the sand control pipe. Only the spiral blades need to be replaced when necessary. On the other hand, it can guide the path of sand and gravel, preventing sand and gravel from accumulating at the sand control pipe and affecting the normal transmission of fluid, thereby ensuring the stability of the throttle.

[0014] Preferably, the front end of the sand-proof pipe is tapered, and a mudguard is installed inside the sand-proof pipe.

[0015] After the fluid passes through the spiral blades, it is affected by the pressure difference and flows towards the mudguard. At the same time, the sand and gravel flow upward along the edge of the mudguard and move upward along the side wall of the shaft, eventually reaching the transition sleeve. Over a long period of time, the sand and gravel gradually form a blockage, further ensuring that the slip body and the rubber sleeve will not reset, thereby improving the efficiency of the throttle.

[0016] Preferably, the adjusting mechanism includes a slide groove, a wedge block, and a pressing block. The slide groove is formed inside the transition sleeve, the wedge block is installed inside the slide groove, the pressing block is located at the front end of the locking ring sleeve, and the pressing block has an inclined surface on the side facing the wedge block.

[0017] As the compression ring slides outward, it fits against the edges of the locking ring sleeve and the transition sleeve, thus forming a seal and increasing the connection strength between the two, thereby improving the stability of the throttle.

[0018] Preferably, a limiting ring is provided between the slip seat and the slip body, and the cross-section of the limiting ring is I-shaped.

[0019] During the repeated lifting process, the slip body and the limiting ring repeatedly collide, which allows the limiting ring to gradually embed into the gaps between the slip body, thereby improving the slip body's fixation effect on the side wall.

[0020] Preferably, there are two rubber tubes, and the two rubber tubes have staggered protrusions on their opposite sides.

[0021] When the rubber sleeve extends outward to achieve a seal, the misaligned protrusions on the two corresponding surfaces can interlock to form a radial fixation.

[0022] An integrated sand control and retrieval device, which is compatible with any of the above-mentioned slip-type downhole chokes, includes a casing, a pawl and a return spring inside the casing, the pawl being arranged in a ring array inside the casing, the return spring being located between the pawl and the casing, and the end of the retrieval head having a locking part that engages with the pawl.

[0023] When retrieval is required, the retrieval head is gradually wrapped around the sleeve. Then, under the action of the pawl and the return spring, the locking part on the retrieval head passes over the pawl, and the pawl locks the retrieval head in the opposite direction. At this time, when the sleeve moves upward, the pawl will drive the retrieval head to move upward, thereby achieving retrieval.

[0024] The beneficial effects of this invention are as follows:

[0025] 1. The present invention proposes a slip-type downhole choke, wherein a sand-prevention mechanism is installed at the bottom of the choke to prevent sand and gravel from flowing upward from the axis. At the same time, the sand-prevention mechanism, together with the adjustment mechanism, can further fix and seal the choke under the rapid impact of materials during long-term use, thereby improving the efficiency of the choke.

[0026] 2. The present invention proposes a slip-type downhole choke. During the upward flow of fluid, it first passes through the helical blades. At this time, the helical blades block the impact of the fluid on the sand control pipe and guide the sand and gravel to flow to both sides along the helical blades. On the one hand, it reduces the direct impact of sand and gravel on the sand control pipe, thereby avoiding damage to the sand control pipe. Only the helical blades need to be replaced when necessary. On the other hand, it guides the path of sand and gravel, preventing sand and gravel from accumulating at the sand control pipe and affecting the normal flow of fluid. Under the action of the helical blades, the sand and gravel carried in the fluid will flow along the path of the helical blades to the side wall of the sand control pipe, thereby forming a fill.

[0027] 3. The present invention proposes a slip-type downhole throttle, which, through a three-stage synergistic filtration structure of sandproof pipe, locking ring sleeve, and retaining ring, allows sand and gravel to gradually reach the inclined position of the squeezing block, thereby pushing the squeezing block. Since the squeezing block moves radially, it will push the squeezing block outward, thereby improving the compaction effect of sand and gravel at the squeezing block under lateral squeezing and increasing its friction. The radially moving squeezing block will gradually push the wedge block, thereby driving the wedge block to gradually move upward, so that the wedge block presses against the locking ring sleeve. On the other hand, the squeezing ring slides outward and will fit with the edge of the locking ring sleeve and the transition sleeve, thus forming a seal and improving the connection strength of the two, thereby improving the stability of the throttle. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are one embodiment of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is an overall diagram of the throttle device of the present invention;

[0030] Figure 2 This is a half-sectional schematic diagram of the throttle device of the present invention;

[0031] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0032] Figure 4 yes Figure 2 Enlarged view of point B in the middle;

[0033] Figure 5 yes Figure 2 Enlarged view of point C in the middle;

[0034] Figure 6 yes Figure 2Enlarged view at point D;

[0035] Figure 7 yes Figure 2 Enlarged view at point E in the middle;

[0036] Figure 8 This is a schematic diagram of the sand-prevention mechanism of the present invention;

[0037] Figure 9 yes Figure 8 Enlarged view at point F;

[0038] Figure 10 This is a schematic diagram of the adjusting mechanism of the present invention;

[0039] Figure 11 This is a schematic diagram of the salvage device of the present invention.

[0040] In the diagram: 1. Deployment and retraction structure; 101. Deployment head; 102. Retrieval head; 1021. Locking part; 103. Deployment pin; 104. Connecting head; 2. End cap; 3. Shaft; 4. Slip seat; 5. Slip body; 6. Central tube; 7. Cone; 8. Rubber sleeve; 81. Protrusion; 9. Retaining ring; 11. Sand prevention mechanism; 111. Transition sleeve; 112. Locking ring sleeve; 113. Sand prevention pipe; 1131. Mudguard; 114. Spiral blade; 12. Adjustment mechanism; 121. Slide groove; 122. Wedge block; 123. Extrusion block; 1231. Inclined surface; 13. Limiting ring; 14. Unsealing shear pin; 15. Sleeve; 16. Pawl; 17. Return spring; 18. Throttling nozzle. Detailed Implementation

[0041] To better understand the above solution, the technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] like Figure 1 , 2As shown, the present invention provides a slip-type downhole choke, comprising a retractable structure 1, an end cap 2, a shaft 3, a slip seat 4, a slip body 5, a central tube 6, a cone 7, a rubber sleeve 8, a retaining ring 9, a sand control mechanism 11, an adjustment mechanism 12, and a choke nozzle 18. The retractable structure 1 is located at the rear end of the end cap 2, the shaft 3 is located at the center of the end cap 2, the slip body 5 is installed at the front end of the slip seat 4, and the central tube 6 passes sequentially through the rubber sleeve 8, the cone 7, the slip body 5, and the slip seat 4. The seat 4 is connected to the end cap 2. The shaft 3 is located at the center. The retractable structure 1 is connected to the shaft 3. The rubber sleeve 8 is sleeved on the outside of the central tube 6. The retaining ring 9 is installed at the front end of the rubber sleeve 8. The adjusting mechanism 12 is located to the right of the retaining ring 9. The throttle nozzle 18 is located at the front end of the shaft 3. The sand prevention mechanism 11 is installed at the front end of the shaft 3. When the slip seat 4 pushes the slip body 5 to fix it, the sand prevention mechanism 11 drives the adjusting mechanism 12 to drive the retaining ring 9 in the opposite direction. The retaining ring 9 drives the rubber sleeve 8 to lock together.

[0043] The retractable structure 1 is used to move the slip-type throttle device up and down, thereby satisfying the placement and extraction of the throttle device. The shaft 3 is a hollow structure, which enables the flow of matter, thereby achieving the throttling of matter. During placement, the retractable structure 1 drives the shaft 3 to move downward, thereby driving the central tube 6 and the cone 7 to move downward. However, at this time, the end cap 2, the slip seat 4, and the slip body 5 will move downward due to gravity, and the relative movement distance is greater than that of the cone 7. Thus, the distance between the slip body 5 and the cone 7 is further reduced, and the device reaches the pre-installed position. At this time, the retractable structure 1 is quickly lifted, which in turn drives the rubber cylinder 8, cone 7 and other components to move upward instantly, thus forming a relative movement with the slip body 5. This causes the slip body 5 to be squeezed. After repeated squeezing, the slip body 5 gradually engages with the outside, thus fixing the entire throttle. After the slip body 5 engages, the cone 7 simultaneously squeezes the rubber cylinder 8, which, in conjunction with the retaining ring 9, pushes the rubber cylinder 8 outward, thus expanding outward and forming a seal against the outside, preventing the material from flowing out from the outside and thus reducing the efficiency of the throttle.

[0044] The sand prevention mechanism 11 is installed at the bottom of the throttle to prevent sand and gravel from flowing upward from the shaft 3. At the same time, the sand prevention mechanism 11, together with the adjustment mechanism 12, can further fix and seal the throttle under the rapid impact of materials during long-term use, thereby improving the efficiency of the throttle. The throttle nozzle 18 is used to flow materials. A certain pressure difference is formed between the upper and lower parts of the throttle nozzle 18. The pressure difference makes the throttle seat seal more and more secure.

[0045] like Figure 1 , 2As shown, the launching and retrieving structure 1 includes a launching head 101, a retrieval head 102, a launching pin 103, and a connecting head 104. The launching head 101 and the retrieval head 102 are both installed at the front end of the shaft 3. The launching pin 103 is installed between the launching head 101 and the retrieval head 102. The connecting head 104 is located at the launching pin 103.

[0046] A rope is installed above the dispensing head 101, suspending the dispensing head 101 downwards. This rope then drives the dispensing pin 103 and the connecting head 104 to move the shaft 3 synchronously. The dispensing pin 103 is used for rotational fixation. Initially, rotating the upper rope causes the dispensing head 101 to rotate with the dispensing pin 103, thereby engaging the dispensing head 101 with the connecting head 104. The rope drives the dispensing head 101 downwards, which in turn drives the entire throttle device downwards. Once the throttle device is fixed and sealed, rotating the rope causes the dispensing head 101 to rotate relative to the connecting head 104, and then detach along the dispensing pin 103, achieving convenient installation and detachment.

[0047] like Figure 2 , 3 As shown in Figures 4, 5, and 10, the sand control mechanism 11 includes a transition sleeve 111, a locking ring sleeve 112, a sand control tube 113, and a spiral blade 114. The transition sleeve 111 is installed at the front end of the retaining ring 9, the locking ring sleeve 112 is installed between the retaining ring 9 and the transition sleeve 111, the sand control tube 113 is installed at the front end of the shaft 3, and the spiral blade 114 is installed inside the sand control tube 113.

[0048] During the upward flow of fluid, it first passes through the spiral blades 114. At this time, the spiral blades 114 block the impact of the fluid on the sand control pipe 113, and at the same time guide the sand and gravel to flow to both sides along the spiral blades 114. On the one hand, it reduces the direct impact of sand and gravel on the sand control pipe 113, thereby avoiding damage to the sand control pipe 113. Only the spiral blades 114 need to be replaced when necessary. On the other hand, it guides the path of the sand and gravel, preventing sand and gravel from accumulating at the sand control pipe 113 and affecting the normal transmission of fluid. Under the action of the spiral blades 114, the sand and gravel carried in the fluid will flow along the path of the spiral blades 114 towards the side wall of the sand control pipe 113, thereby forming a fill. On this basis, the gravity of the sand and gravel is less than the flow force of the water, so the sand and gravel can be located at this point and can push the small throttle to a certain extent. This is for small throttles with a diameter of about tens of millimeters. For large throttles, although it does not play a pushing role, the fill can gradually increase over time, thereby ensuring the stability of the throttle.

[0049] like Figure 2 , 7 As shown in Figures 8 and 9, the front end of the sand-proof pipe 113 is tapered, and a mudguard 1131 is installed inside the sand-proof pipe 113.

[0050] The mudguard 1131 further protects the shaft 3, preventing sand and gravel from entering. The mudguard 1131 is perpendicular to the axial direction of the shaft 3 and tangent to the helix of the spiral blade 114. After the fluid passes the spiral blade 114, the pressure difference causes the liquid to flow towards the mudguard 1131, while sand and gravel flow upwards along the edge of the mudguard 1131, moving upwards along the side wall of the shaft 3 and reaching the transition sleeve 111. Over time, this accumulation gradually forms a barrier. Furthermore, when the slip body 5 wears after prolonged use, the transition sleeve 111 at the bottom provides upward pressure, further ensuring that the slip body 5 and the rubber sleeve 8 do not reset, thus improving the efficiency of the throttle.

[0051] like Figure 2 , 6 As shown, the adjustment mechanism 12 includes a slide groove 121, a wedge block 122, and a pressing block 123. The slide groove 121 is opened in the transition sleeve 111, the wedge block 122 is installed in the slide groove 121, and the pressing block 123 is located at the front end of the locking ring sleeve 112. The pressing block 123 has an inclined surface 1231 on the side facing the wedge block 122.

[0052] As the sand and gravel flow upwards, they gradually reach the inclined surface 1231 of the extrusion block 123, thus pushing the extrusion block 123. Since the extrusion block 123 moves radially, it pushes the extrusion block 123 outwards, thereby improving the compaction effect of the sand and gravel at the extrusion block 123 under lateral extrusion and increasing its friction. The radially moving extrusion block 123 gradually pushes the wedge block 122, thereby driving the wedge block 122 upwards, so that the wedge block 122 presses against the locking ring sleeve 112. On the other hand, the extrusion ring slides outwards and fits against the edge of the locking ring sleeve 112 and the transition sleeve 111, thus forming a seal and improving the connection strength between the two, thereby improving the stability of the throttle.

[0053] like Figure 2 As shown, a limiting ring 13 is provided between the slip seat 4 and the slip body 5, and the cross section of the limiting ring 13 is I-shaped.

[0054] The limiting ring 13 protects and fixes the slip body 5. When the whole is placed downwards, the slip seat 4 will drive the slip body 5 downwards. Then, under the action of gravity, the slip seat 4 slides downwards towards the limiting ring 13, and then pushes the slip body 5. Then, the delivery head 101 is lifted upwards. Under repeated action, the slip seat 4 and the slip body 5 will be gradually squeezed together. At this time, the limiting ring 13 forms a fixing and protection function, which further pushes the slip body 5. At the same time, it can be made of hard rubber. Under sufficient pressure, it can deform. In the process of repeated lifting, the slip body 5 and the limiting ring 13 repeatedly collide, which can make the limiting ring 13 gradually embed into the gap of the slip body 5, thereby improving the fixing effect of the slip body 5 on the side wall.

[0055] like Figure 2 , 4 As shown in Figure 5, there are two glue cylinders 8, and the two glue cylinders 8 have intersecting protrusions 81 on their opposite sides.

[0056] When the rubber sleeve 8 extends outward to achieve a seal, the rubber sleeve 8 expands radially along the axis. At this time, when the rubber sleeve 8 expands, the misaligned protrusions 81 on the two corresponding surfaces can interlock with each other, thereby forming a radial fixation, which can resist part of the gravity, thus improving the sealing effect of the rubber sleeve 8. A release shear pin 14 is installed between the slip seat 4 and the retrieval head 102.

[0057] like Figure 1 , 2 As shown in Figure 11, an integrated sand control and retrieval device is adapted to any of the above-mentioned type 5 downhole choke bodies. It includes a casing 15, in which a pawl 16 and a return spring 17 are provided. The pawl 16 is arranged in a ring array inside the casing 15, and the return spring 17 is located between the pawl 16 and the casing 15. The end of the retrieval head 102 is provided with a locking part 1021, which engages with the pawl 16.

[0058] When retrieval is required, the retrieval head 102 is gradually wrapped around the sleeve 15. Then, under the action of the pawl 16 and the return spring 17, the locking part 1021 on the retrieval head 102 passes over the pawl 16, and the pawl 16 locks the retrieval head 102 in the opposite direction. At this time, when the sleeve 15 moves upward, the pawl 16 will drive the retrieval head 102 to move upward, thereby realizing retrieval.

[0059] During the deployment phase: The staff connects the throttle with tools (such as ropes) and lowers it into the well. Before setting, the deployment tool is connected to the throttle via the deployment pin 103. At this time, the slips are loose and the sealing rubber sleeve 8 is in a naturally contracted state.

[0060] Sealing Stage: By repeatedly raising the steel wire to the preset tension, the retracting structure 1 drives the slip-type throttle to rise and fall. The retracting structure 1 also drives the shaft 3 downwards, thereby causing the central tube 6 and cone 7 to move downwards. However, at this time, the end cap 2, slip seat 4, and slip body 5 are affected by gravity and will move downwards, with a relative movement distance greater than that of the cone 7. This further reduces the distance between the slip body 5 and the cone 7. After the throttle reaches the predetermined position, wait a few minutes and record the tension value. Then, quickly raise the wire; the tension count increases. Continue raising the steel wire, controlling the tension value, and repeat the lowering and raising actions. Pay attention to the change in the tension count value during lowering. During raising... The throttle is released by repeated impacts during lowering; at this moment, the rubber sleeve 8, cone 7, etc., momentarily rise, thus creating relative movement with the slip body 5, which in turn causes the slip body 5 to be squeezed. After repeated squeezing, the slip body 5 gradually engages with the outer side, thus fixing the entire throttle. The delivery head 101 is moved downward by the rope, thus moving the entire throttle downward. After the throttle is fixed and sealed, the delivery head 101 is rotated relative to the connecting head 104 by rotating the rope, and then disengages along the delivery pin 103. As the rope moves upward, only the delivery head 101 is pulled out of the wellbore, while the rest of the throttle remains in the wellbore, and the throttle is successfully set. A certain pressure difference is formed above and below the throttle nozzle 18, and the pressure difference makes the throttle set more and more secure.

[0061] Retrieval Phase: The deployment tool is replaced with a retrieval tool. The tool string is connected and lowered into the well. The retrieval head 102 is gradually wrapped around the casing 15. Then, under the action of the pawl 16 and the return spring 17, the locking part 1021 on the retrieval head 102 passes over the pawl 16, and the pawl 16 locks the retrieval head 102 in the opposite direction. At this time, when the casing 15 moves upward, the pawl 16 will drive the retrieval head 102 to move upward. Under the action of the pulling force, the unsealing shear pin 14 is cut off. Continue to lift to release the slips and the cone 7. At the same time, the sealing rubber sleeve 8 contracts. Continue to lift to retrieve the downhole choke.

[0062] The foregoing has shown and described the basic principles and beneficial effects of the present invention. However, the present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its effects and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A slip-type downhole choke, characterized by: The utility model provides a sand control device, including retraction structure (1), end cover (2), axle (3), slip seat (4), slip body (5), center tube (6), cone (7), rubber cylinder (8), baffle ring (9), sand prevention mechanism (11), adjusting mechanism (12) and throttle nozzle (18), retraction structure (1) is located in the rear end of end cover (2), axle (3) is located in the center position of end cover (2), slip body (5) is installed in the front end of slip seat (4), center tube (6) passes through rubber cylinder (8), cone (7), slip body (5) and slip seat (4) in proper order and is arranged, slip seat (4) is connected with end cover (2), axle (3) is located in the center position, retraction structure (1) is connected with axle (3), rubber cylinder (8) is set outside center tube (6), baffle ring (9) is installed in the front end of rubber cylinder (8), adjusting mechanism (12) is located in the right side of baffle ring (9), throttle nozzle (18) is located in the front end of axle (3), sand prevention mechanism (11) is installed in the most front end of axle (3), when slip seat (4) pushes slip body (5) and fixes, sand prevention mechanism (11) drives adjusting mechanism (12) and drives push baffle ring (9) reversely, baffle ring (9) drives rubber cylinder (8) and is locked mutually, The retraction structure (1) includes a launching head (101), a fishing head (102), a launching pin (103), and a connecting head (104), the launching head (101) and the fishing head (102) are both installed at the rear end of the axle (3), the launching pin (103) is installed between the launching head (101) and the fishing head (102), and the connecting head (104) is located at the launching pin (103). The sand prevention mechanism (11) includes a transition sleeve (111), a lock ring sleeve (112), a sand prevention pipe (113), and a spiral blade (114), the transition sleeve (111) is installed at the front end of the baffle ring (9), the lock ring sleeve (112) is installed between the baffle ring (9) and the transition sleeve (111), the sand prevention pipe (113) is installed at the front end of the axle (3), and the spiral blade (114) is installed in the sand prevention pipe (113).

2. A slip-type downhole choke in accordance with claim 1, characterized in that: The front end of the sand prevention pipe (113) is conical, and a fender (1131) is installed in the sand prevention pipe (113).

3. A slip-type downhole throttling device according to claim 1, characterized in that: The adjusting mechanism (12) includes a sliding groove (121), a wedge-shaped block (122), and an extrusion ring (123), the sliding groove (121) is formed in the transition sleeve (111), the wedge-shaped block (122) is installed in the sliding groove (121), the extrusion ring (123) is located at the front end of the lock ring sleeve (112), and an inclined surface (1231) is arranged on the side of the extrusion ring (123) facing the wedge-shaped block (122).

4. A slip-type downhole regulator according to claim 1, characterized in that: A limiting ring (13) is arranged between the slip seat (4) and the slip body (5), and the limiting ring (13) is in the shape of an I-beam.

5. A slip-type downhole regulator according to claim 1, characterized in that: The number of the rubber cylinders (8) is two, and the opposite sides of the two rubber cylinders (8) are provided with protrusions (81) staggered with each other.

6. A slip-type downhole throttling device according to claim 4, characterized in that: The slip seat (4) and the fishing head (102) are provided with unblocking shear pins (14).

7. An integrated sand control fishing device adapted to the slip-type downhole choke of any one of claims 1-6, characterized in that: The fishing head (102) is provided with a clamping portion (1021) at the end, and the clamping portion (1021) is matched with the pawl (16).

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