Drilling liner hanger with sand cleaning and preventing functions

Abstract

The invention relates to the technical field of tools for well cementation engineering, in particular to a drilling liner hanger with sand removing and preventing functions, and aims to solve the technical problems that in the related technology, a feeding drilling tool is buried by sand due to the fact that well bottom settled sand is accumulated on the upper portion of a tie-back barrel, the feeding drilling tool cannot be smoothly lifted out, and then the risk of extrusion deformation and abnormal insertion of the tie-back barrel is caused. According to the drilling liner hanger with the sand cleaning and preventing functions, the rotational flow unit and the power unit which are connected are arranged at the top of the tie-back barrel, the rotational flow unit is driven to rotate through impact of pump pressure fluid on rotational flow blades of the power unit, rotational flow impacting the top of the tie-back barrel is generated, and therefore settled sand is prevented from being accumulated on the upper portion of the tie-back barrel. The technical problems that according to an existing drilling liner hanger, due to the fact that settled sand at the well bottom is accumulated on the upper portion of a tie-back barrel, a feeding drilling tool is buried by the sand, the tie-back barrel cannot be lifted out smoothly, and then the risk of extrusion deformation and abnormal insertion of the tie-back barrel is caused are solved.

Description

Technical Field

[0001] This invention relates to the field of cementing engineering tools, and in particular to a tailpipe hanger with sand cleaning and sand prevention functions. Background Technology

[0002] Tailtub cementing is a crucial step in improving wellbore integrity, and the proper functioning of the tailtub hanger and the smooth execution of the tailtub reconnection operation are paramount. However, after the tailtub hanger is set, tested, and cemented, situations often arise where the delivery tool cannot be retrieved, resulting in stuck drill string. Field analysis indicates that sand accumulation at the bottom of the well can bury the delivery tool, preventing successful retrieval. Furthermore, unsticking measures increase the risk of tension and compression on the reconnection area, leading to fatigue damage or deformation, and consequently increasing the risk of abnormal insertion.

[0003] The existing tailpipe hanger has a technical problem: when sand accumulates at the bottom of the well and on the upper part of the return tube, the drill string is buried by sand, making it impossible to pull out smoothly, which in turn leads to the risk of extrusion deformation of the return tube and abnormal insertion. Summary of the Invention

[0004] The purpose of this invention is to provide a tailpipe hanger with sand-clearing and sand-prevention functions, so as to overcome the technical problem in related technologies where the drilling tool is buried by sand due to the accumulation of sand at the bottom of the well in the upper part of the return tube, which makes it impossible to pull out smoothly, and thus brings about the risk of extrusion deformation of the return tube and abnormal insertion.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows: The tailpipe hanger with sand cleaning and sand prevention functions provided by this invention includes: The system includes a detachably connectable feed system assembly and a mounting system assembly, the mounting system assembly comprising a return tube. The feed system assembly includes a feed string and a sand removal assembly. The sand removal assembly includes a swirling unit and a power unit rotatably mounted on the feed string and positioned at the top of the return tube. The swirling unit is equipped with helical ribs, and the power unit is equipped with swirling blades. Fluid impact on the swirling blades drives the power unit to rotate, thereby driving the connected swirling unit to rotate, forming a swirling flow impacting the top of the return tube.

[0006] Specifically, the swirling unit includes a swirling generator with multiple helical oblique ridges evenly distributed around its outer circumference. The power unit includes a power core, a power housing, and a spline. The power core is fixedly mounted to the feed tube via the spline, and the power housing is fitted onto and rotatably connected to the power core. The swirling generator and the power housing are connected. An annular channel is formed between the power core and the power housing. The swirling blades include flow-carrying blades, which are disposed on the power housing and located within the annular channel. The fluid in the annular channel impacts the flow-carrying blades, causing the power housing to rotate relative to the power core, thereby driving the swirling generator to rotate, changing the fluid velocity and flow regime, and thus generating a swirling flow to carry away solid particles from the top of the receiving cylinder.

[0007] Specifically, the swirl vanes also include guide vanes with the opposite swirl direction to the flow-carrying vanes, which are disposed within the power core. Both the guide vanes and the flow-carrying vanes are disposed in the annular channel and arranged along the axial direction of the feed tube. The guide vanes are used to change the flow direction of the fluid in the annular channel so that the fluid impacts the flow-carrying vanes and drives the power housing to rotate, thereby driving the swirl unit to rotate.

[0008] Specifically, the power core comprises multiple inner core sections. The power outer casing comprises multiple outer casing sections, an upper ring, and a lower ring. Guide vanes are disposed on the outer wall of the inner core sections, and flow-carrying vanes are disposed on the inner wall of the outer casing sections. The guide vanes and flow-carrying vanes are arranged alternately along the axial direction of the feed tube. The upper ring, each outer casing section, and the lower ring are sequentially connected and fastened together with screws; the upper ring is connected to the vortex generator. Each inner core section is arranged sequentially and fixedly connected to the feed tube via splines.

[0009] Specifically, the feed system assembly also includes a sand control component. This component includes a sand cap and a sand filter element. The sand cap has a balancing hole, and the sand filter element has a flow channel and filter holes. The sand filter element is fitted onto the feed string and inserted into the return sleeve. The sand cap is fitted onto the feed string and abuts against the end of the return sleeve to seal the annular opening between the return sleeve and the feed string. The wellbore environment, balancing hole, flow channel, filter holes, and return sleeve are sequentially connected to balance the internal and external pressures of the return sleeve and simultaneously limit the flow diameter to prevent solid particles from entering the return sleeve.

[0010] Specifically, the sand control assembly also includes fixing screws. The sand control cap and the sand control filter element are connected as a single unit using fixing screws. The sand control filter element is equipped with a flexible pawl, and the return cylinder has an annular groove. The flexible pawl engages with the annular groove to achieve a stable connection with the return cylinder.

[0011] Specifically, the feed tube includes a coupling, which is located on the side of the sand filter element away from the sand cleaning assembly. The annular groove is provided with a guide cone surface. The axial movement of the coupling can cause the elastic pawl to elastically deform and radially contract along the guide cone surface through contact with the sand filter element, thereby disengaging it from the annular groove and separating the sand filter element from the return tube.

[0012] Specifically, the sand control assembly also includes an emergency valve core, which is installed on the sand control filter element. The emergency valve core is equipped with a vent hole that runs through the sand control filter element and a pressure rupture disc that seals the vent hole. When the filter hole is blocked, causing the pressure difference between the inside and outside of the return cylinder to exceed a set threshold, the pressure rupture disc will rupture, thereby opening the vent hole and restoring the pressure balance between the inside and outside of the return cylinder, preventing pressure difference damage to the return cylinder.

[0013] Specifically, the feed system assembly also includes a locking component, which comprises a reverse-threaded sleeve and a sealing core. The feed string also includes a reverse-threaded connector with a positioning step. The mounting system assembly also includes a connected sealing connector and a hanger body, the sealing connector having a mating groove. The reverse-threaded sleeve is threaded onto the sealing connector and abuts against one end of the positioning step. The sealing core engages with the mating groove and abuts against the other end of the positioning step. The reverse-threaded sleeve and the sealing core axially limit the positioning step, enabling the docking of the feed string and the hanger body. Rotation of the feed string disengages the reverse-threaded sleeve from the sealing connector, thereby releasing the axial limitation of the reverse-threaded sleeve on the reverse-threaded connector.

[0014] Specifically, the feed string also includes a central tube with a clearance groove. The sealing core includes a sealing end, a locking ring, a sealing sleeve locking block, and a plug pin. A sealing ring is installed on the sealing end to seal the annular space between the feed string and the sealing joint. The sealing end abuts against the positioning step, and the locking ring is installed at the end of the sealing end away from the positioning step. The locking ring has a groove extending radially along the sealing joint, and the sealing sleeve locking block slides in the groove. Multiple sealing sleeve locking blocks and the same number of grooves are evenly distributed around the axis of the sealing joint. The sealing sleeve locking block has a limiting groove and a protrusion; the plug pin is inserted into the locking ring and penetrates the limiting groove to limit the sliding stroke of the sealing sleeve locking block. The sliding of the sealing sleeve locking block along the groove causes the protrusions to engage or disengage from the mating groove. When the sealing sleeve locking block abuts against the feed string, each protrusion engages with the mating groove. When the sealing sleeve locking block abuts against the clearance groove, each protrusion disengages from the mating groove, thereby separating the hanger body from the feed string.

[0015] Based on the above technical solutions, the beneficial effects of the present invention are analyzed as follows: This invention provides a tailpipe hanger with sand cleaning and sand prevention functions, comprising: The system includes a detachably connectable feed system assembly and a mounting system assembly, the mounting system assembly comprising a return tube. The feed system assembly includes a feed string and a sand removal assembly. The sand removal assembly includes a swirling unit and a power unit rotatably mounted on the feed string and positioned at the top of the return tube. The swirling unit is equipped with helical ribs, and the power unit is equipped with swirling blades. Fluid impact on the swirling blades drives the power unit to rotate, thereby driving the connected swirling unit to rotate, forming a swirling flow impacting the top of the return tube.

[0016] In practical applications, the feed string is connected to the mounting system assembly and lowered into the well together. When the pump is started for circulation, the flowing fluid in the wellbore impacts the swirl vanes of the power unit, applying a force that drives the swirl unit to rotate. As the swirl unit rotates, it alters the fluid flow pattern at the top of the return tube via its helical ribs, thereby generating a continuous swirling flow that impacts the top of the return tube. Solid particles at the top of the return tube are carried away, thus preventing the accumulation of sediment at the top of the return tube.

[0017] As can be seen, compared with existing technologies, this tailpipe hanger with sand-clearing and sand-prevention functions has a connected vortex unit and a power unit at the top of the return tube. The vortex unit is driven to rotate by the impact of pumped fluid on the vortex blades of the power unit, generating a vortex that impacts the top of the return tube, thereby preventing the accumulation of sand in the upper part of the return tube. This overcomes the technical problem of existing tailpipe hangers where the drill string is buried by sand due to the accumulation of sand at the bottom of the well in the upper part of the return tube, making it impossible to pull out smoothly, and thus leading to the risk of extrusion deformation of the return tube and abnormal insertion. Attached Figure Description

[0018] 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the tailpipe hanger with sand cleaning and sand prevention function provided in an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the tailpipe hanger with sand cleaning and sand prevention functions. Figure 2 ; Figure 3 Schematic diagram of the structure of the system assembly. Figure 1 ; Figure 4 Schematic diagram of the structure of the system assembly. Figure 2 ; Figure 5 This is a structural schematic diagram of the seat-mounted system assembly; Figure 6 This is a schematic diagram of the structure of the suspension body; Figure 7 This is a structural diagram of the sand removal component. Figure 8 This is a structural schematic diagram of the sand-proof component. Figure 9 This is a structural diagram of the sealing core. Figure 10A schematic diagram of the structure at the recessed area; Figure 11 This is a schematic diagram of the cyclone generator. Figure 12 This is a schematic diagram of the structure of the outer shell short section; Figure 13 This is a schematic diagram of the inner core section. Figure 14 This is a structural schematic diagram of a sand-proof filter element; Figure 15 This is a schematic diagram of the emergency valve core.

[0020] icon: 1000. Feed system assembly; 1100. Feed string; 1110. Coupling; 1120. Backlash connector; 1101. Positioning step; 1130. Center tube; 1102. Clearance groove; 1140. Lifting sub; 1150. Tubing coupling; 1200. Sand removal assembly; 1210. Swirl unit; 1211. Swirl generator; 1201. Spiral bevel; 1220. Power unit; 1221. Power core; 12211. Core sub; 1203. Guide vane; 1222. Power housing; 12221. Housing sub; 1202. Flow-carrying vane; 12 222. Upper ring; 12223. Lower ring; 1223. Spline; 1300. Sandproof assembly; 1310. Sandproof cap; 1301. Balance hole; 1320. Sandproof filter element; 1302. Flow guide groove; 1303. Filter hole; 1321. Elastic pawl; 1330. Fixing screw; 1340. Emergency valve core; 1400. Locking assembly; 1410. Reverse threaded sleeve; 1420. Sealing core; 1421. Sealing end; 1422. Locking ring; 1401. Slide groove; 1423. Sealing sleeve locking block; 1402. Limiting groove; 1403. Protrusion; 1424. Insert pin; 2000, Seat and Mount System Assembly; 2100, Return Sleeve; 2101, Annular Groove; 2102, Guide Cone Surface; 2200, Sealing Joint; 2203, Docking Groove; 2300, Suspension Body; 2310, Suspension Pipe Body; 2320, Push Sleeve; 2330, Push Rod; 2340, Slipper; 2350, Limiting Ring; 2360, Piston; 2370, Shear Pin. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0024] The existing tailpipe hanger has a technical problem: when sand accumulates at the bottom of the well and on the upper part of the return tube, the drill string is buried by sand, making it impossible to pull out smoothly, which in turn leads to the risk of extrusion deformation of the return tube and abnormal insertion.

[0025] In view of this, the present invention provides a tailpipe hanger with sand cleaning and sand prevention functions, comprising: The system includes a detachably connected feed system assembly 1000 and a mounting system assembly 2000, the mounting system assembly 2000 including a return tube 2100. The feed system assembly 1000 includes a feed string 1100 and a sand removal assembly 1200. The sand removal assembly 1200 includes a swirling unit 1210 rotatably mounted on the feed string 1100 and disposed on the top of the return tube 2100, and a power unit 1220. The swirling unit 1210 is provided with a helical oblique rib 1201, and the power unit 1220 is provided with swirling blades. Fluid impact on the swirling blades drives the power unit 1220 to rotate, thereby driving the connected swirling unit 1210 to rotate, forming a swirling impact on the top of the return tube 2100.

[0026] In summary, the tailpipe hanger with sand cleaning and prevention functions provided by this invention can achieve the following technical effects: This tailpipe hanger with sand-clearing and sand-prevention functions has a connected vortex unit 1210 and a power unit 1220 at the top of the return tube 2100. The vortex unit 1210 is driven to rotate by the impact of pumped fluid on the vortex blades of the power unit 1220, generating a vortex that impacts the top of the return tube 2100, thus preventing the accumulation of sand in the upper part of the return tube. This overcomes the technical problem of existing tailpipe hangers where the accumulation of sand at the bottom of the well in the upper part of the return tube causes the drill string to be buried in sand, making it impossible to pull out smoothly, and leading to the risk of extrusion deformation of the return tube and abnormal insertion.

[0027] The following combination Figures 1 to 15 The structure and shape of the tailpipe hanger with sand cleaning and sand prevention function provided in this embodiment are described in detail: In this embodiment, the swirl unit 1210 includes a swirl generator 1211, with multiple helical oblique ribs 1201 evenly distributed around its outer periphery. The power unit 1220 includes a power inner core 1221, a power outer shell 1222, and a spline 1223. The power inner core 1221 is fixedly mounted to the feed column 1100 via the spline 1223, and the power outer shell 1222 is sleeved on and rotatably connected to the power inner core 1221. The swirl generator 1211 and the power outer shell 1222 are connected. An annular channel is formed between the power inner core 1221 and the power outer shell 1222. The swirl blades include flow-carrying blades 1202, which are disposed on the power outer shell 1222 and located in the annular channel. The fluid in the annular channel impacts the flow-carrying blades 1202, causing the power housing 1222 to rotate relative to the power inner core 1221, thereby driving the vortex generator 1211 to rotate to change the flow rate and flow state of the fluid, and thus generate a vortex to carry away the solid particles at the top of the return cylinder 2100.

[0028] Regarding the structural composition of the feedstock 1100, specifically: The feed string 1100 includes a lifting section 1140, a coupling 1110, a reverse joint 1120, a central tube 1130, and a tubing coupling 1150 connected in sequence.

[0029] Regarding the structural composition of the 2000 mount system assembly, specifically: The suspension system assembly 2000 includes a return sleeve 2100, a sealing joint 2200, and a suspension body 2300 connected in sequence. The suspension body 2300 includes a suspension tube body 2310, a push sleeve 2320, a push rod 2330, a slip 2340, a limiting ring 2350, a piston 2360, and a shear pin 2370. The push sleeve 2320 is fitted onto the suspension tube body 2310 and connected to the slip 2340 via the push rod 2330. The suspension tube body 2310 has a conical surface, and the inner conical surface of the slip 2340 mates with the conical surface of the suspension tube body 2310. The limiting ring 2350 is fitted onto the suspension tube body 2310 and forms a hydraulic cylinder. The piston 2360 is mounted in the hydraulic cylinder and is poweredly connected to the push sleeve 2320. The push sleeve 2320 is locked to the limiting ring 2350 via the shear pin 2370. When the ball is thrown and pressurized, the piston 2360 slides along the hydraulic cylinder to drive the push sleeve 2320 to cut the shear pin 2370, and pushes the slip 2340 to open radially along the conical surface of the suspension tube body 2310 to realize the tail tube seat.

[0030] To enhance the rotational power of the power housing 1222, in this embodiment, the swirl vanes further include guide vanes 1203 with the opposite rotation direction to the flow-carrying vanes 1202. The guide vanes 1203 are disposed within the power core 1221. Both the guide vanes 1203 and the flow-carrying vanes 1202 are disposed in the annular channel and arranged along the axial direction of the feed tube 1100. The guide vanes 1203 are used to change the flow direction of the fluid in the annular channel so that the fluid impacts the flow-carrying vanes 1202 and drives the power housing 1222 to rotate, thereby driving the swirl unit 1210 to rotate.

[0031] In this embodiment, the power core 1221 includes multiple core sections 12211. The power housing 1222 includes multiple housing sections 12221, an upper ring 12222, and a lower ring 12223. Guide vanes 1203 are disposed on the outer wall of the core sections 12211, and flow-carrying vanes 1202 are disposed on the inner wall of the housing sections 12221. The guide vanes 1203 and flow-carrying vanes 1202 are arranged alternately along the axial direction of the feed tube 1100. The upper ring 12222, each housing section 12221, and the lower ring 12223 are sequentially connected and fastened together with screws. The upper ring 12222 is connected to the vortex generator 1211. Each core section 12211 is arranged sequentially and fixedly connected to the feed tube 1100 via a spline 1223.

[0032] To prevent solid particles from entering the return tube 2100, in this embodiment, the feed system assembly 1000 further includes a sand control component 1300. The sand control component 1300 includes a sand control cap 1310 and a sand control filter element 1320. The sand control cap 1310 has a balance hole 1301, and the sand control filter element 1320 has a guide groove 1302 and filter holes 1303. The sand control filter element 1320 is sleeved on the feed column 1100 and inserted into the return tube 2100. The sand control cap 1310 is sleeved on the feed column 1100 and abuts against the end of the return tube 2100 to seal the annular opening between the return tube 2100 and the feed column 1100. The wellbore environment, balance hole 1301, guide groove 1302, filter hole 1303 and return cylinder 2100 are connected in sequence to balance the internal and external pressure of the return cylinder 2100, while limiting the flow diameter to prevent solid particles from entering the return cylinder 2100.

[0033] To prevent the sand-proof cap 1310 and sand-proof filter element 1320 from being pulled away from the return tube 2100 before the suspension operation is completed, thus causing the sand-proof function to fail, the sand-proof assembly 1300 in this embodiment also includes a fixing screw 1330. The sand-proof cap 1310 and sand-proof filter element 1320 are connected as a whole by the fixing screw 1330. The sand-proof filter element 1320 is provided with an elastic pawl 1321, and the return tube 2100 has an annular groove 2101. The elastic pawl 1321 engages with the annular groove 2101 to achieve a stable connection with the return tube 2100, so that the sand-proof cap 1310 and sand-proof filter element 1320 will not rise and detach from the return tube 2100 when subjected to frictional forces from the well wall or the feed string 1100 during lowering or trial lifting, thereby avoiding the failure of the sand-proof function caused by the opening of the return tube 2100.

[0034] In this embodiment, the coupling 1110 is located on the side of the sand filter element 1320 away from the sand cleaning assembly 1200. The annular groove 2101 is provided with a guide cone surface 2102. When the feed system assembly 1000 is lifted out, the axial movement of the coupling 1110 can cause the elastic pawl 1321 to elastically deform and radially contract along the guide cone surface 2102 through abutment with the sand filter element 1320, thereby disengaging from the annular groove 2101 and separating the sand filter assembly 1300 and the return cylinder 2100.

[0035] To prevent damage to the return cylinder 2100 due to pressure difference caused by blockage of the filter orifice 1303, the sand control assembly 1300 in this embodiment also includes an emergency valve core 1340, which is installed on the sand control filter element 1320. The emergency valve core 1340 is provided with a vent hole penetrating the sand control filter element 1320 and a pressure rupture disc that seals the vent hole. When the filter orifice 1303 is blocked, causing the pressure difference between the inside and outside of the return cylinder 2100 to exceed a set threshold, the pressure rupture disc will rupture, thereby opening the vent hole and restoring the pressure balance between the inside and outside of the return cylinder 2100, thus preventing pressure difference damage to the return cylinder 2100.

[0036] Specifically, regarding how the feed string 1100 interfaces with the mounting system assembly 2000: The feed system assembly 1000 also includes a locking component 1400, which includes a reverse threaded sleeve 1410 and a sealing core 1420. The reverse threaded connector 1120 is provided with a positioning step 1101. The mounting system assembly 2000 also includes a connected sealing connector 2200 and a hanger body 2300. The sealing connector 2200 has a mating groove 2203. The reverse threaded sleeve 1410 is threaded onto the sealing connector 2200 and abuts against one end of the positioning step 1101. The sealing core 1420 is engaged with the mating groove 2203 and abuts against the other end of the positioning step 1101. The reverse threaded sleeve 1410 and the sealing core 1420 axially limit the positioning step 1101, enabling the mating of the feed string 1100 and the hanger body 2300. The rotation of the inserted tubing 1100 is used to disengage the reverse threaded sleeve 1410 from the sealing joint 2200, thereby releasing the axial restriction of the reverse threaded sleeve 1410 on the reverse joint 1120.

[0037] Specifically, regarding how the feed string 1100 interfaces with the mounting system assembly 2000: The central tube 1130 is provided with a clearance groove 1102. The sealing core 1420 includes a sealing end 1421, a locking ring 1422, a sealing sleeve locking block 1423, and a plug pin 1424. The sealing end 1421 is equipped with a sealing ring for sealing the annular space between the feed string 1100 and the sealing joint 2200. The sealing end 1421 abuts against the positioning step 1101, and the locking ring 1422 is installed at the end of the sealing end 1421 away from the positioning step 1101. The locking ring 1422 has a groove 1401 extending radially along the sealing joint 2200, and the sealing sleeve locking block 1423 slides in the groove 1401. Multiple sealing sleeve locking blocks 1423 and the same number of grooves 1401 are evenly distributed around the axis of the sealing joint 2200. The sealing sleeve locking block 1423 is provided with a limiting groove 1402 and a protrusion 1403. The insertion pin 1424 is inserted into the locking ring 1422 and penetrates the limiting groove 1402 to limit the sliding stroke of the sealing sleeve locking block 1423. The sliding of the sealing sleeve locking block 1423 along the sliding groove 1401 is used to drive the protrusion 1403 to engage or disengage from the docking groove 2203. When the sealing sleeve locking block 1423 abuts against the central tube 1130, each protrusion 1403 engages with the docking groove 2203. When the sealing sleeve locking block 1423 abuts against the relief groove 1102, each protrusion 1403 disengages from the docking groove 2203, thereby separating the hanger body 2300 from the feed column 1100.

[0038] In summary, the specific working process of the tailpipe hanger with sand cleaning and sand prevention function provided in this embodiment is as follows: During on-site implementation, the mounting system assembly 2000 is lowered into the well along with the delivery system assembly 1000. The sand cap 1310 and sand filter element 1320, through the filtration effect of the balance hole 1301, the guide channel 1302, and the filter hole 1303, restrict solid particles from entering the return cylinder 2100. Before or after the tailpipe is in place, after the pump is started and circulated, the pump-pressurized fluid, flowing through the annular channel of the power unit 1220, is guided by the guide vane 1203 to the flow-bearing vane 1202, driving the power housing 1222 and the vortex generator 1211 to rotate. The rotation of the vortex generator 1211 changes the fluid velocity and flow state, thereby generating a vortex that carries away solid particles from the top of the return cylinder 2100. Once the tailpipe hanger is in place, the setting ball is engaged to pressurize it. The piston 2360 slides along the hydraulic cylinder to drive the push sleeve 2320 to shear the shear pin 2370, and pushes the slip 2340 to open radially along the conical surface of the suspension pipe body 2310, thus achieving tailpipe mounting.

[0039] After the mounting is completed, the handle is reversed and released, and the insertion string 1100 is rotated to disengage the reverse threaded sleeve 1410 from the sealing joint 2200. After releasing, a test lift is performed to check the suspension effect of the suspension pipe body 2310. The sand control component 1300 remains stationary relative to the return cylinder 2100 through the engagement of the elastic pawl 1321 with the annular groove 2101, effectively preventing solid particles from entering the return cylinder 2100. The ball seat is circulated to perform cementing operations. After cementing is completed, the insertion string 1100 is lifted. When the coupling 1110 reaches the sand control filter 1320, the elastic pawl 1321 disengages from the annular groove 2101 along the guide cone surface 2102 under the action of the lifting force, and is taken out of the wellbore along with the insertion string 1100.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tailpipe hanger with sand cleaning and sand prevention functions, characterized in that, include: A detachably connected feed system assembly and a mount system assembly, the mount system assembly including a return tube; The feed system assembly includes a feed tube and a sand removal assembly; the sand removal assembly includes a vortex unit and a power unit rotatably mounted on the feed tube and located at the top of the return tube; the vortex unit is provided with a spiral oblique rib, and the power unit is provided with vortex blades; the fluid impacts the vortex blades, which drives the power unit to rotate, thereby driving the connected vortex unit to rotate, forming a vortex impacting the top of the return tube. The swirl unit includes a swirl generator, and multiple helical oblique ribs are evenly distributed on the outer periphery of the swirl generator; The power unit includes a power core, a power housing, and a spline; The power core is fixedly installed on the feed column via a spline, the power housing is fitted and rotatably connected to the power core, and the cyclone generator is connected to the power housing; A ring-shaped channel is formed between the inner power core and the outer power shell; The swirl vane includes a flow-carrying vane, which is disposed in the power housing and located in the annular channel; The fluid in the annular channel impacts the flow-carrying blades, causing the power housing to rotate relative to the power core, thereby driving the vortex generator to rotate to change the flow rate and flow state of the fluid, and thus generating a vortex to carry away the solid particles back to the top of the receiving cylinder. The swirl vane also includes a guide vane with the opposite swirl direction to the flow-carrying vane, and the guide vane is disposed in the power core; Both the guide vanes and the flow-carrying vanes are located in the annular channel and are arranged along the axial direction of the feed tube. The guide vanes are used to change the flow direction of the fluid in the annular channel so that the fluid impacts the flow-bearing vanes and drives the power housing to rotate, thereby driving the vortex unit to rotate.

2. The tailpipe hanger with sand cleaning and sand prevention function according to claim 1, characterized in that: The power core consists of multiple core sections; The power housing includes multiple housing sections, an upper ring, and a lower ring; The guide vanes are located on the outer wall of the inner core section, and the flow-carrying vanes are located on the inner wall of the outer shell section. The guide vanes and the flow-carrying vanes are arranged alternately along the axial direction of the feed tube; The upper ring, each outer shell section and the lower ring are connected in sequence and fastened together by screws. The upper ring is connected to the cyclone generator. Each inner core section is arranged in sequence and fixedly connected to the feed string via a spline.

3. The tailpipe hanger with sand cleaning and sand prevention function according to claim 1, characterized in that: The feed system assembly also includes sand protection components; The sand control assembly includes a sand control cap and a sand control filter element. The sand control cap is provided with a balance hole, and the sand control filter element is provided with a flow guide groove and filter holes. The sand filter element is fitted onto the feed tube and inserted into the return tube; A sand cap is fitted onto the feed string and abuts against the end of the return sleeve to seal the annular opening between the return sleeve and the feed string; The wellbore environment, balance hole, guide groove, filter hole and return tube are connected in sequence to balance the internal and external pressure of the return tube, while limiting the flow diameter to prevent solid particles from entering the return tube.

4. The tailpipe hanger with sand cleaning and sand prevention function according to claim 3, characterized in that: The sand-proof components also include fixing screws; The sandproof cap and sandproof filter element are connected as one piece by fixing screws; The sand filter element is equipped with a flexible pawl, and the return cylinder has an annular groove. The flexible pawl engages with the annular groove to achieve a stable connection with the return cylinder.

5. The tailpipe hanger with sand cleaning and sand prevention function according to claim 4, characterized in that: The feed tube includes a coupling, which is located on the side of the sand filter element away from the sand cleaning component; The annular groove is provided with a guide cone surface; The axial movement of the coupling can cause the elastic pawl to undergo elastic deformation and radial contraction along the guide cone surface through contact with the sand filter element, thereby separating the sand filter component and the return cylinder.

6. The tailpipe hanger with sand cleaning and sand prevention function according to claim 4, characterized in that: The sand control assembly also includes an emergency valve core, which is installed on the sand control filter element; The emergency valve core is equipped with a vent that passes through the sand filter element and a pressure rupture disc that seals the vent. When the filter holes become clogged, causing the pressure difference between the inside and outside of the return tube to exceed the set threshold, the pressure rupture disc will break, thereby opening the vent and restoring the pressure balance inside and outside the return tube, thus preventing the pressure difference from damaging the return tube.

7. The tailpipe hanger with sand cleaning and sand prevention function according to claim 1, characterized in that: The feed system assembly also includes a locking component, which includes a reverse threaded sleeve and a sealing filler core; The feed string also includes an undercut connector, which is provided with a positioning step; The seat-mounted system assembly also includes a connected sealing joint and a suspension body, with the sealing joint having a mating groove; The reverse threaded sleeve is threaded into the sealing joint and abuts against one end of the positioning step; The sealing core is snapped into the mating groove and abuts against the other end of the positioning step; The reverse threaded sleeve and sealing core axially limit the positioning step to achieve docking between the inserted tubing and the hanger body; The rotation of the inserted tubing is used to disengage the reverse threaded sleeve from the sealing joint, thereby releasing the axial restriction of the reverse threaded sleeve on the reverse joint.

8. The tailpipe hanger with sand cleaning and sand prevention function according to claim 7, characterized in that: The feed tube also includes a central tube, which is provided with a clearance groove. The sealing core includes a sealing end, a locking ring, a sealing sleeve locking block, and a plug pin; A sealing ring is installed at the sealing end to seal the annular space between the feed tube and the sealing joint; The sealing end abuts against the positioning step, and the locking ring is installed at the end of the sealing end away from the positioning step; The locking ring has a groove extending radially along the sealing joint, and the sealing sleeve locking block slides in the groove; Multiple sealing sleeve locking blocks and the same number of sliding grooves are evenly distributed around the axis of the sealing joint; The sealing sleeve locking block is provided with a limit groove and a protrusion. The insertion pin is inserted into the locking ring and penetrates the limit groove to limit the sliding stroke of the sealing sleeve locking block. The sliding of the sealing sleeve locking block along the slide groove is used to drive the protrusion to engage or disengage from the mating groove; When the sealing sleeve locking block abuts against the feed tube, each protrusion engages with the mating groove; When the sealing sleeve locking block abuts against the relief groove, each protrusion disengages from the mating groove, thereby separating the hanger body from the feed string.

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