A tailpipe hanger with sand cleaning and sand prevention functions

Abstract

The present application relates to the tool technical field for cementing engineering, especially relates to a tailpipe hanger with sand cleaning and preventing function, aiming at overcoming the technical problem that in related technology, because of the accumulation of well bottom sand in the upper part of the back connection cylinder, the sent drilling tool is buried by sand, so that it cannot be smoothly pulled out, and further causes the risk of back connection cylinder extrusion deformation and insertion abnormality. The tailpipe hanger with sand cleaning and preventing function is provided with a rotating flow unit and a power unit connected at the top of the back connection cylinder, the rotating flow unit is driven to rotate by the impact of the pump pressure fluid on the rotating flow blades of the power unit, and the rotating flow impacting the top of the back connection cylinder is generated, so that the accumulation of well bottom sand in the upper part of the back connection cylinder is avoided. The technical problem that in the existing tailpipe hanger, because of the accumulation of well bottom sand in the upper part of the back connection cylinder, the sent drilling tool is buried by sand, so that it cannot be smoothly pulled out, and further causes the risk of back connection cylinder extrusion deformation and insertion abnormality is overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tools for cementing engineering, and particularly relates to a tailpipe hanger with sand cleaning and preventing functions. BACKGROUND

[0002] Tailpipe cementing is a key link to improve the integrity of the wellbore, and the normal work of the tailpipe hanger and the smooth construction of the tailpipe tieback operation are crucial. However, after the tailpipe hanger is hung, the tripping is tested, and the cementing is completed, the situation that the running tool cannot be pulled out often occurs, which leads to the running tool being stuck and being unable to be pulled out. Field analysis shows that the bottom sand accumulation on the upper part of the tieback cylinder can cause the running tool to be buried by sand, so that the running tool cannot be smoothly pulled out. In addition, the unblocking measures can increase the risk of the tieback cylinder position being subjected to tension and pressure, leading to the fatigue damage or extrusion deformation of the tieback cylinder, and further increasing the risk of abnormal insertion.

[0003] The existing tailpipe hanger has the technical problem that the bottom sand accumulation on the upper part of the tieback cylinder can cause the running tool to be buried by sand, so that the running tool cannot be smoothly pulled out, and further causing the risk of extrusion deformation and abnormal insertion of the tieback cylinder. SUMMARY

[0004] The present application aims to provide a tailpipe hanger with sand cleaning and preventing functions to overcome the technical problem in the prior art that the bottom sand accumulation on the upper part of the tieback cylinder can cause the running tool to be buried by sand, so that the running tool cannot be smoothly pulled out, and further causing the risk of extrusion deformation and abnormal insertion of the tieback cylinder.

[0005] To solve the above technical problem, the technical solution provided by the present application is as follows:

[0006] The tailpipe hanger with sand cleaning and preventing functions provided by the present application comprises:

[0007] The detachable connection of the running system assembly and the hanging system assembly, the hanging system assembly comprises a tieback cylinder. The running system assembly comprises a running string and a sand cleaning assembly. The sand cleaning assembly comprises a rotational flow unit rotatably installed on the running string and arranged at the top of the tieback cylinder, and a power unit. The rotational flow unit is provided with a spiral inclined edge, and the power unit is provided with a rotational flow blade. The fluid impacts the rotational flow blade to drive the power unit to rotate, thereby driving the connected rotational flow unit to rotate, and forming a rotational flow impact on the top of the tieback cylinder.

[0008] Specifically, the cyclone unit comprises a cyclone generator, and a plurality of helical inclined edges are uniformly distributed on the periphery of the cyclone generator. The power unit comprises a power inner core, a power outer shell, and a spline. The power inner core is fixedly installed on the feed-in pipe column through the spline, the power outer shell is sleeved and rotationally connected to the power inner core, and the cyclone generator is connected to the power outer shell. An annular channel is formed between the power inner core and the power outer shell. The cyclone blade comprises a flow bearing blade, and the flow bearing blade is arranged on the power outer shell and located in the annular channel. The fluid in the annular channel impacts the flow bearing blade to drive the power outer shell to rotate relative to the power inner core, thereby driving the cyclone generator to rotate to change the flow rate and flow state of the fluid, and further generating a cyclone to carry away the solid particles at the top of the back connection cylinder.

[0009] Specifically, the cyclone blade further comprises a flow guide blade opposite in rotation direction to the flow bearing blade, and the flow guide blade is arranged on the power inner core. The flow guide blade and the flow bearing blade are both arranged in the annular channel and arranged along the axis direction of the feed-in pipe column. The flow guide blade is used to change the flow direction of the fluid in the annular channel to make the fluid impact the flow bearing blade and drive the power outer shell to rotate, thereby driving the cyclone unit to rotate.

[0010] Specifically, the power inner core comprises a plurality of inner core short sections. The power outer shell comprises a plurality of outer shell short sections, an upper end ring, and a lower end ring. The flow guide blade is arranged on the outer wall of the inner core short section, and the flow bearing blade is arranged on the inner wall of the outer shell short section. The flow guide blade and the flow bearing blade are staggered along the axis direction of the feed-in pipe column. The upper end ring, each outer shell short section, and the lower end ring are sequentially connected and fastened into one body by screws, and the upper end ring is connected to the cyclone generator. Each inner core short section is sequentially arranged and fixedly connected to the feed-in pipe column through the spline.

[0011] Specifically, the feed-in system assembly further comprises a sand prevention assembly. The sand prevention assembly comprises a sand prevention cap and a sand prevention filter element. The sand prevention cap is provided with a balance hole, and the sand prevention filter element is provided with a flow guide groove and a filter hole. The sand prevention filter element is sleeved on the feed-in pipe column and inserted into the back connection cylinder. The sand prevention cap is sleeved on the feed-in pipe column and abuts against the end portion of the back connection cylinder to block the annular opening between the back connection cylinder and the feed-in pipe column. The wellbore environment, the balance hole, the flow guide groove, the filter hole, and the back connection cylinder are sequentially communicated, which is used to balance the internal and external pressures of the back connection cylinder and limit the passage diameter to prevent solid particles from entering the back connection cylinder.

[0012] Specifically, the sand prevention assembly further comprises a fixing screw. The sand prevention cap and the sand prevention filter element are connected into one body by the fixing screw. The sand prevention filter element is provided with an elastic pawl, and the back connection cylinder is provided with an annular groove. The elastic pawl is clamped in the annular groove, which is used to realize stable connection with the back connection cylinder.

[0013] Specifically, the feed-in pipe column comprises a coupling, and the coupling is arranged on the side of the sand prevention 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 drive the elastic pawl to elastically deform radially to contract radially to disengage from the annular groove through abutting against the sand prevention filter element, thereby separating the sand prevention assembly and the back connection cylinder.

[0014] Specifically, the sand prevention assembly further comprises an emergency valve core installed on the sand prevention filter element. The emergency valve core is provided with a blow-off hole penetrating through the sand prevention filter element and a pressure rupture disc blocking the blow-off hole. When the internal and external pressure difference of the back-connection cylinder exceeds a set threshold value due to the blockage of the filter hole, the pressure rupture disc will break, thereby opening the blow-off hole, and then restoring the pressure balance inside and outside the back-connection cylinder, to avoid damage to the back-connection cylinder caused by the pressure difference.

[0015] Specifically, the running-in system assembly further comprises a locking assembly comprising a reverse thread sleeve and a sealing core. The running-in string further comprises a back-off joint provided with a positioning step. The hanger system assembly further comprises a sealing joint and a hanger body connected in sequence, and the sealing joint is provided with a butt joint groove. The reverse thread sleeve is threadedly connected to the sealing joint and abuts against one end of the positioning step. The sealing core is clamped in the butt joint groove and abuts against the other end of the positioning step. The reverse thread sleeve and the sealing core axially limit the positioning step, so as to realize the butt joint of the running-in string and the hanger body. The rotation of the running-in string is used to realize the unbuckling of the reverse thread sleeve and the sealing joint, thereby releasing the axial limitation of the reverse thread sleeve on the back-off joint.

[0016] Specifically, the running-in string further comprises a central pipe provided with a recess. The sealing core comprises a sealing end, a locking ring, a sealing sleeve locking block and a plug-in pin. The sealing end is provided with a sealing ring for blocking the annular space between the running-in 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 is provided with a sliding groove extending radially along the sealing joint, and the sealing sleeve locking block slides in the sliding groove. The same number of sealing sleeve locking blocks and sliding grooves are uniformly distributed around the axis of the sealing joint. The sealing sleeve locking block is provided with a limiting groove and a protruding part, and the plug-in pin is inserted into the locking ring and penetrates the limiting groove, for limiting the sliding stroke of the sealing sleeve locking block. The sliding of the sealing sleeve locking block along the sliding groove is used to drive the protruding part to be clamped or separated from the butt joint groove. When the sealing sleeve locking block abuts against the running-in string, each protruding part is clamped in the butt joint groove. When the sealing sleeve locking block abuts against the recess, each protruding part is separated from the butt joint groove, so that the hanger body is separated from the running-in string.

[0017] Based on the above technical solutions, the beneficial effects of the present application are as follows:

[0018] The present application provides a tailpipe hanger with sand cleaning and prevention functions, comprising:

[0019] The detachable running-in system assembly and the hanger system assembly, and the hanger system assembly comprises a back-connection cylinder. The running-in system assembly comprises a running-in string and a sand cleaning assembly. The sand cleaning assembly comprises a rotational flow unit rotatably installed on the running-in string and arranged at the top of the back-connection cylinder, and a power unit. The rotational flow unit is provided with a spiral inclined edge, and the power unit is provided with a rotational flow blade. Fluid impact on the rotational flow blade drives the power unit to rotate, thereby driving the connected rotational flow unit to rotate, forming a rotational flow impact on the top of the back-connection cylinder.

[0020] In a specific application, the running string is connected with the seat-hanging system assembly and is lowered into the well together. When the pump is started to circulate, the flowing fluid in the wellbore impacts on the cyclone vane of the power unit, and a force to drive the cyclone unit to rotate is applied to the power unit. When the cyclone unit rotates, the fluid flow state at the top of the back-off sleeve is changed by the helical inclined edge, so as to generate a continuous cyclone impacting on the top of the back-off sleeve. The solid particles at the top of the back-off sleeve are carried away, so as to avoid the accumulation of sand at the upper part of the back-off sleeve.

[0021] It can be seen that, compared with the prior art, the tailpipe hanger with sand cleaning and preventing functions is provided with the connected cyclone unit and power unit at the top of the back-off sleeve. The cyclone unit is driven to rotate by the impact of the pump pressure fluid on the cyclone vane of the power unit, and a cyclone impacting on the top of the back-off sleeve is generated, so as to avoid the accumulation of sand at the upper part of the back-off sleeve. The technical problem that the existing tailpipe hanger is buried in sand due to the accumulation of sand at the upper part of the back-off sleeve, so that the running drilling tool cannot be smoothly pulled out, and further the risk of back-off sleeve extrusion deformation and insertion abnormality is overcome. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the present application, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] Figure 1 Structure diagram of the tailpipe hanger with sand cleaning and preventing functions provided for the embodiments of the present application Figure 1 ;

[0024] Figure 2 Structure diagram of the tailpipe hanger with sand cleaning and preventing functions Figure 2 ;

[0025] Figure 3 Structure diagram of the tailpipe hanger with sand cleaning and preventing functions Figure 1 ;

[0026] Figure 4 Structure diagram of the tailpipe hanger with sand cleaning and preventing functions Figure 2 ;

[0027] Figure 5 Structure diagram of the tailpipe hanger with sand cleaning and preventing functions

[0028] Figure 6 Structure diagram of the tailpipe hanger with sand cleaning and preventing functions

[0029] Figure 7 Structure diagram of the tailpipe hanger with sand cleaning and preventing functions

[0030] Figure 8 Structure diagram of the sand control assembly;

[0031] Figure 9 Structure diagram of the sealing core;

[0032] Figure 10 Structure diagram of the let-in groove;

[0033] Figure 11 Structure diagram of the rotational flow generator;

[0034] Figure 12 Structure diagram of the outer shell;

[0035] Figure 13 Structure diagram of the inner core;

[0036] Figure 14 Structure diagram of the sand control filter;

[0037] Figure 15 Structure diagram of the emergency valve core.

[0038] Icon:

[0039] 1000, delivery system assembly; 1100, delivery string; 1110, coupling; 1120, back-off sub; 1101, positioning step; 1130, central pipe; 1102, let-in groove; 1140, lifting sub; 1150, tubing coupling; 1200, sand cleaning assembly; 1210, rotational flow unit; 1211, rotational flow generator; 1201, helical inclined edge; 1220, power unit; 1221, power inner core; 12211, inner core sub; 1203, flow guiding blade; 1222, power outer shell; 12221, outer shell sub; 1202, flow carrying blade; 12222, upper end ring; 12223, lower end ring; 1223, spline; 1300, sand control assembly; 1310, sand control cap; 1301, balance hole; 1320, sand control filter; 1302, flow guiding groove; 1303, filter hole; 1321, elastic pawl; 1330, fixing screw; 1340, emergency valve core; 1400, locking assembly; 1410, reverse thread sleeve; 1420, sealing core; 1421, sealing end; 1422, locking ring; 1401, sliding groove; 1423, sealing sleeve locking block; 1402, limiting groove; 1403, protruding part; 1424, plug-in pin;

[0040] 2000, hanger assembly; 2100, back-connection cylinder; 2101, ring groove; 2102, guide cone; 2200, sealing joint; 2203, butt joint groove; 2300, hanger body; 2310, hanger pipe body; 2320, push sleeve; 2330, push rod; 2340, slip; 2350, limiting ring; 2360, piston; 2370, shear pin. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0043] The following will be combined with the accompanying drawings to make a detailed description of some embodiments of the present application. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0044] The existing tailpipe hanger has the technical problem that the bottom sand in the well bottom is accumulated on the upper part of the back-connection cylinder, causing the running tool to be buried in sand, so that the running tool cannot be smoothly pulled out, and further causing the risk of extrusion deformation and insertion anomaly of the back-connection cylinder.

[0045] Therefore, the present application provides a tailpipe hanger with sand cleaning and preventing functions, comprising:

[0046] The detachable connection of the running system assembly 1000 and the hanger assembly 2000, the hanger assembly 2000 comprising a back-connection cylinder 2100. The running system assembly 1000 comprises a running pipe column 1100 and a sand cleaning assembly 1200. The sand cleaning assembly 1200 comprises a rotational flow unit 1210 rotatably installed on the running pipe column 1100 and arranged on the top of the back-connection cylinder 2100, and a power unit 1220. The rotational flow unit 1210 is provided with a spiral inclined edge 1201, and the power unit 1220 is provided with rotational flow blades. Fluid impact on the rotational flow blades drives the power unit 1220 to rotate, thereby driving the connected rotational flow unit 1210 to rotate, forming rotational flow impact on the top of the back-connection cylinder 2100.

[0047] In summary of the above technical solutions, the tailpipe hanger with sand cleaning and preventing functions provided by the present application can achieve the following technical effects:

[0048] The tailpipe hanger with sand cleaning and preventing function is provided with the connected cyclone unit 1210 and power unit 1220 at the top of the back-connection cylinder 2100, the cyclone unit 1210 is driven to rotate by the impact of the pump pressure fluid on the cyclone blades of the power unit 1220, and the cyclone at the top of the back-connection cylinder 2100 is generated, thereby avoiding the accumulation of sand at the upper part of the back-connection cylinder. The technical problem that the existing tailpipe hanger is buried in sand due to the accumulation of sand at the upper part of the back-connection cylinder, thereby cannot be smoothly pulled out, and further causes the back-connection cylinder to be squeezed and deformed and the insertion to be abnormal is overcome.

[0049] The following will be described in detail Figures 1 to 15 The structure and shape of the tailpipe hanger with sand cleaning and preventing function provided by the embodiment will be described in detail:

[0050] In the scheme of the embodiment, the cyclone unit 1210 includes a cyclone generator 1211, and a plurality of spiral inclined edges 1201 are uniformly distributed on the outer periphery of the cyclone generator 1211. 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 installed on the running-in pipe string 1100 through the spline 1223, the power outer shell 1222 is sleeved and rotationally connected to the power inner core 1221, and the cyclone generator 1211 is connected to the power outer shell 1222. An annular channel is formed between the power inner core 1221 and the power outer shell 1222. The cyclone blades include flow bearing blades 1202, which are arranged on the power outer shell 1222 and located in the annular channel. The fluid in the annular channel impacts the flow bearing blades 1202 to drive the power outer shell 1222 to rotate relative to the power inner core 1221, thereby driving the cyclone generator 1211 to rotate to change the flow rate and flow state of the fluid, and further generating a cyclone to carry away the solid particles at the top of the back-connection cylinder 2100.

[0051] Regarding the structure and composition of the running-in pipe string 1100, specifically:

[0052] The running-in pipe string 1100 includes a lifting sub 1140, a coupling 1110, a back-off joint 1120, a center pipe 1130 and a tubing coupling 1150 connected in sequence.

[0053] Regarding the structure and composition of the seat hanging system assembly 2000, specifically:

[0054] The seat hanging system assembly 2000 comprises a back connection cylinder 2100, a sealing joint 2200 and a hanger body 2300 connected in sequence. The hanger body 2300 comprises a hanger pipe 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 sleeved on the hanger pipe body 2310 and connected with the slip 2340 through the push rod 2330. The hanger pipe body 2310 is provided with a taper surface, and the inner taper surface of the slip 2340 matches the taper surface of the hanger pipe body 2310. The limiting ring 2350 is sleeved on the hanger pipe body 2310 and formed with a liquid cylinder, and the piston 2360 is installed in the liquid cylinder and connected with the push sleeve 2320 in power. The push sleeve 2320 is locked with the limiting ring 2350 through the shear pin 2370. By ball throwing and pressure holding, the piston 2360 slides along the liquid cylinder to drive the push sleeve 2320 to shear the shear pin 2370, and the slip 2340 is pushed to open radially along the taper surface of the hanger pipe body 2310, thereby realizing the seat hanging of the tail pipe.

[0055] In order to enhance the rotating power of the power shell 1222, in the scheme of the embodiment, the rotational flow blade further comprises a guide flow blade 1203 opposite in rotation direction to the bearing flow blade 1202, and the guide flow blade 1203 is arranged on the power inner core 1221. The guide flow blade 1203 and the bearing flow blade 1202 are arranged in the annular channel and arranged along the axis direction of the feed-in pipe string 1100. The guide flow blade 1203 is used for changing the flow direction of the fluid in the annular channel so that the fluid impacts the bearing flow blade 1202 and drives the power shell 1222 to rotate, thereby driving the rotational flow unit 1210 to rotate.

[0056] In the scheme of the embodiment, the power inner core 1221 comprises a plurality of inner core short sections 12211. The power shell 1222 comprises a plurality of shell short sections 12221, an upper end ring 12222 and a lower end ring 12223. The guide flow blade 1203 is arranged on the outer wall of the inner core short section 12211, and the bearing flow blade 1202 is arranged on the inner wall of the shell short section 12221. The guide flow blade 1203 and the bearing flow blade 1202 are staggered arranged along the axis direction of the feed-in pipe string 1100. The upper end ring 12222, the shell short sections 12221 and the lower end ring 12223 are connected in sequence and fastened into one body by screws, and the upper end ring 12222 is connected with the rotational flow generator 1211. The inner core short sections 12211 are arranged in sequence and fixedly connected with the feed-in pipe string 1100 through the splines 1223.

[0057] To avoid solid particles entering the inside of the back-connection cylinder 2100, in the scheme of the embodiment, the running-in system assembly 1000 further comprises a sand-prevention assembly 1300. The sand-prevention assembly 1300 comprises a sand-prevention cap 1310 and a sand-prevention filter 1320. The sand-prevention cap 1310 is provided with a balance hole 1301, and the sand-prevention filter 1320 is provided with a flow guide groove 1302 and filter holes 1303. The sand-prevention filter 1320 is sleeved on the running-in pipe string 1100 and inserted into the back-connection cylinder 2100. The sand-prevention cap 1310 is sleeved on the running-in pipe string 1100 and abuts against the end of the back-connection cylinder 2100 to block the annular opening between the back-connection cylinder 2100 and the running-in pipe string 1100. The wellbore environment, the balance hole 1301, the flow guide groove 1302, the filter holes 1303 and the back-connection cylinder 2100 are sequentially communicated to balance the internal and external pressures of the back-connection cylinder 2100 while limiting the gauge to prevent solid particles from entering the back-connection cylinder 2100.

[0058] To avoid the sand-prevention cap 1310 and the sand-prevention filter 1320 being driven to disengage from the back-connection cylinder 2100 before the completion of the hanging operation, thereby causing the sand-prevention function to fail, in the scheme of the embodiment, the sand-prevention assembly 1300 further comprises a fixing screw 1330. The sand-prevention cap 1310 and the sand-prevention filter 1320 are connected into one body through the fixing screw 1330. The sand-prevention filter 1320 is provided with an elastic pawl 1321, and the back-connection cylinder 2100 is provided with an annular groove 2101. The elastic pawl 1321 is clamped in the annular groove 2101 to realize stable connection with the back-connection cylinder 2100, so that the sand-prevention cap 1310 and the sand-prevention filter 1320 will not move upward and disengage from the back-connection cylinder 2100 under the action of frictional force from the well wall or the running-in pipe string 1100 when being lowered or tripped, thereby avoiding the sand-prevention function failure caused by the opening of the back-connection cylinder 2100.

[0059] In the scheme of the embodiment, the coupling 1110 is arranged on the side of the sand-prevention filter 1320 away from the sand cleaning assembly 1200. The annular groove 2101 is provided with a guide taper surface 2102. When the running-in system assembly 1000 is tripped out, the axial movement of the coupling 1110 can drive the elastic pawl 1321 to elastically deform radially to shrink out of the annular groove 2101 along the guide taper surface 2102 by abutting against the sand-prevention filter 1320, thereby separating the sand-prevention assembly 1300 and the back-connection cylinder 2100.

[0060] To avoid the pressure difference between the inside and outside of the running joint 2100 after the filter holes 1303 are blocked, damaging the running joint 2100, the sand control assembly 1300 in the embodiment further includes an emergency valve core 1340 installed on the sand control filter 1320. The emergency valve core 1340 is provided with a blow-off hole penetrating through the sand control filter 1320 and a pressure rupture disc blocking the blow-off hole. When the filter holes 1303 are blocked, causing the pressure difference between the inside and outside of the running joint 2100 to exceed the set threshold, the pressure rupture disc will break, thereby opening the blow-off hole, and then restoring the pressure balance between the inside and outside of the running joint 2100, avoiding damage to the running joint 2100 due to the pressure difference.

[0061] As to how the running-in string 1100 is docked with the hanging system assembly 2000, specifically:

[0062] The running-in system assembly 1000 further includes a locking assembly 1400, which includes a reverse buckling sleeve 1410 and a sealing core 1420. The reverse buckling sleeve 1410 is threadedly connected to the sealing joint 2200 and abuts one end of the positioning step 1101. The sealing core 1420 is clamped in the docking groove 2203 and abuts the other end of the positioning step 1101. The reverse buckling sleeve 1410 and the sealing core 1420 axially limit the positioning step 1101, for realizing the docking of the running-in string 1100 and the hanger body 2300. The rotation of the running-in string 1100 is used to realize the unbuckling of the reverse buckling sleeve 1410 and the sealing joint 2200, thereby releasing the axial limitation of the reverse buckling sleeve 1410 on the reverse buckling joint 1120.

[0063] As to how the running-in string 1100 is docked with the hanging system assembly 2000, specifically:

[0064] The center pipe 1130 is provided with a make way groove 1102. The sealing core 1420 includes a sealing end 1421, a locking ring 1422, sealing sleeve locking blocks 1423 and a plug pin 1424. The sealing end 1421 is installed with a sealing ring for sealing the annular space between the running 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 is provided with sliding grooves 1401 extending radially along the sealing joint 2200, and the sealing sleeve locking blocks 1423 slide in the sliding grooves 1401. The same number of sealing sleeve locking blocks 1423 and sliding grooves 1401 are uniformly distributed around the axis of the sealing joint 2200. The sealing sleeve locking blocks 1423 are provided with limiting grooves 1402 and protruding portions 1403, and the plug pin 1424 is inserted into the locking ring 1422 and penetrates the limiting grooves 1402, for limiting the sliding stroke of the sealing sleeve locking blocks 1423. The sliding of the sealing sleeve locking blocks 1423 along the sliding grooves 1401 is used to drive the protruding portions 1403 to be clamped or separated from the butt joint grooves 2203. When the sealing sleeve locking blocks 1423 abut against the center pipe 1130, each protruding portion 1403 is clamped in the butt joint groove 2203. When the sealing sleeve locking blocks 1423 abut against the make way groove 1102, each protruding portion 1403 is separated from the butt joint groove 2203, so that the hanger body 2300 is separated from the running string 1100.

[0065] In summary, the specific working process of the tailpipe hanger with sand cleaning and prevention function provided by the embodiment is as follows:

[0066] In the field implementation process, the seat hanging system assembly 2000 enters the well with the running system assembly 1000. The sand control cap 1310 and the sand control filter element 1320 limit the solid particles from entering the backseat 2100 through the filtering effect of the balance hole 1301, the flow guide groove 1302 and the filter hole 1303. Before or after the tailpipe is in place, after the pump is started, the pump pressure fluid flows to the flow bearing blade 1202 under the flow guiding effect of the flow guide blade 1203 when flowing through the annular channel of the power unit 1220, and drives the power shell 1222 and the cyclone generator 1211 to rotate. The cyclone generator 1211 rotates to change the flow rate and flow state of the fluid, thereby generating a cyclone to carry away the solid particles at the top of the backseat 2100. After the tailpipe hanger is in place, the setting ball is put in to build pressure, the piston 2360 slides along the cylinder to drive the push sleeve 2320 to shear the shear pin 2370, and the slips 2340 are pushed to radially expand along the taper surface of the hanger body 2310, thereby achieving the tailpipe seat hanging.

[0067] After the hanging is completed, the reverse buckle is released, the rotary feed-in string 1100 is rotated to make the reverse buckle sleeve 1410 and the sealing joint 2200 decoupled. After the release, the test is pulled up, the feed-in string 1100 is pulled up to check the hanging effect of the hanging pipe body 2310. The sand control assembly 1300 is kept stationary relative to the back-off sleeve 2100 by the elastic pawl 1321 and the clamping of the ring groove 2101, effectively avoiding the solid particles from entering the back-off sleeve 2100. The through ball seat opening cycle is carried out to implement the cement slurry injection and cementing operation. After the cement injection is completed, the feed-in string 1100 is pulled up, when the coupling 1110 reaches the sand control filter 1320, the elastic pawl 1321 is separated from the ring groove 2101 along the guide cone surface 2102 under the action of the pulling force, and is taken out of the wellbore together with the feed-in string 1100.

[0068] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A liner hanger having a sand clean-out and sand control function, characterized by, The application relates to a tailpipe hanger with sand cleaning and preventing functions. The detachable connection is formed between a running-in system assembly and a hanger system assembly, and the hanger system assembly comprises a back-connection cylinder. The running-in system assembly comprises a running-in pipe column and a sand cleaning assembly; the sand cleaning assembly comprises a rotational flow unit and a power unit which are rotationally installed on the running-in pipe column and arranged at the top of the back-connection cylinder; the rotational flow unit is provided with helical inclined edges, and the power unit is provided with rotational flow blades; fluid impacts the rotational flow blades to drive the power unit to rotate, thereby driving the connected rotational flow unit to rotate and forming rotational flow impact on the top of the back-connection cylinder. The rotational flow unit comprises a rotational flow generator, and a plurality of helical inclined edges are uniformly distributed on the outer periphery of the rotational flow generator. The power unit comprises a power inner core, a power outer shell and splines. The power inner core is fixedly installed on the running-in pipe column through the splines, the power outer shell is sleeved and rotationally connected to the power inner core, and the rotational flow generator is connected to the power outer shell. An annular channel is formed between the power inner core and the power outer shell. The rotational flow blades comprise current-carrying blades, and the current-carrying blades are arranged on the power outer shell and located in the annular channel. Fluid in the annular channel impacts the current-carrying blades to drive the power outer shell to rotate relative to the power inner core, thereby driving the rotational flow generator to rotate to change the flow rate and flow state of the fluid, and further generating rotational flow to carry away solid particles on the top of the back-connection cylinder. The rotational flow blades further comprise guide blades which are opposite in rotation direction to the current-carrying blades, and the guide blades are arranged on the power inner core. The guide blades and the current-carrying blades are arranged in the annular channel and arranged along the axial direction of the running-in pipe column. The guide blades are used to change the flow direction of the fluid in the annular channel so that the fluid impacts the current-carrying blades and drives the power outer shell to rotate, thereby driving the rotational flow unit to rotate.

2. The tailpipe hanger with sand cleaning and preventing functions according to claim 1, wherein: The power inner core comprises a plurality of inner core short sections. The power outer shell comprises a plurality of outer shell short sections, an upper end ring and a lower end ring. The guide blades are arranged on the outer wall of the inner core short sections, and the current-carrying blades are arranged on the inner wall of the outer shell short sections. The guide blades and the current-carrying blades are staggered and arranged along the axial direction of the running-in pipe column. The upper end ring, the outer shell short sections and the lower end ring are sequentially connected and fastened into an integrated whole through screws, and the upper end ring is connected to the rotational flow generator. The inner core short sections are sequentially arranged and fixedly connected to the running-in pipe column through the splines.

3. The tailpipe hanger with sand cleaning and preventing functions according to claim 1, wherein: The running-in system assembly further comprises a sand preventing assembly. The sand preventing assembly comprises a sand preventing cap and a sand preventing filter element, the sand preventing cap is provided with a balance hole, and the sand preventing filter element is provided with a guide groove and a filter hole. The sand preventing filter element is sleeved on the running-in pipe column and inserted into the back-connection cylinder. The sand preventing cap is sleeved on the running-in pipe column and abuts against the end portion of the back-connection cylinder to block the annular opening between the back-connection cylinder and the running-in pipe column. The wellbore environment, the balance hole, the guide groove, the filter hole and the back-connection cylinder are sequentially communicated to balance the internal and external pressures of the back-connection cylinder and limit the passage diameter to prevent solid particles from entering the back-connection cylinder.

4. The tailpipe hanger with sand cleaning and preventing functions according to claim 3, wherein: The sand preventing assembly further comprises a fixing screw. The sand preventing cap and the sand preventing filter element are connected into an integrated whole through the fixing screw. The sand preventing filter element is provided with an elastic pawl, and the back-connection cylinder is provided with an annular groove. The elastic pawl is clamped in the annular groove to realize stable connection with the back-connection cylinder.

5. The tailpipe hanger with sand cleaning and sand control functions according to claim 4, characterized in that: the running-in string comprises a coupling, which is arranged on the side of the sand control filter away from the sand cleaning assembly; the annular groove is provided with a guide cone surface; axial movement of the coupling can drive the elastic pawl to elastically deform and radially contract along the guide cone surface to disengage from the annular groove, thereby separating the sand control assembly and the back-connection sleeve.

6. The tailpipe hanger with sand cleaning and sand control functions according to claim 4, characterized in that: the sand control assembly further comprises an emergency valve core, which is installed on the sand control filter; the emergency valve core is provided with a relief hole penetrating through the sand control filter and a pressure rupture disc blocking the relief hole; when the internal and external pressure difference of the back-connection sleeve exceeds a set threshold due to the filter hole being blocked, the pressure rupture disc will break, thereby opening the relief hole and restoring the pressure balance inside and outside the back-connection sleeve, avoiding damage to the back-connection sleeve due to the pressure difference.

7. The tailpipe hanger with sand cleaning and sand control functions according to claim 1, characterized in that: the running-in system assembly further comprises a locking assembly, which comprises a reverse buckle and a sealing core; the running-in string further comprises a back-off joint, which is provided with a positioning step; the running-in system assembly further comprises a sealing joint and a hanger body connected in series, and the sealing joint is provided with a butt joint groove; the reverse buckle is threadedly connected to the sealing joint and abuts one end of the positioning step; the sealing core is clamped in the butt joint groove and abuts the other end of the positioning step; the reverse buckle and the sealing core axially limit the positioning step, which is used to realize butt joint of the running-in string and the hanger body; rotation of the running-in string is used to realize unbuckling of the reverse buckle and the sealing joint, thereby releasing the axial limitation of the reverse buckle on the back-off joint.

8. The tailpipe hanger with sand cleaning and sand control functions according to claim 7, characterized in that: the running-in string further comprises a central pipe, which is provided with a recess; the sealing core comprises a sealing end, a locking ring, a sealing sleeve locking block and a plug-in pin; the sealing end is provided with a sealing ring, which is used to block the annular space between the running-in string and the sealing joint; the sealing end abuts the positioning step, and the locking ring is installed on the end of the sealing end away from the positioning step; the locking ring is provided with a sliding groove extending radially along the sealing joint, and the sealing sleeve locking block slides in the sliding groove; the same number of sliding grooves and sealing sleeve locking blocks are evenly distributed around the axis of the sealing joint; the sealing sleeve locking block is provided with a limiting groove and a protruding part, and the plug-in pin is inserted into the locking ring and penetrates through the limiting groove, which is used to limit the sliding stroke of the sealing sleeve locking block; sliding of the sealing sleeve locking block along the sliding groove is used to drive the protruding part to clamp or disengage from the butt joint groove; when the sealing sleeve locking block abuts the running-in string, each protruding part clamps the butt joint groove; when the sealing sleeve locking block abuts the recess, each protruding part disengages from the butt joint groove, thereby separating the hanger body and the running-in string.

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