CN201620851U - Differential pressure type downhole choke - Google Patents
Differential pressure type downhole choke Download PDFInfo
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- CN201620851U CN201620851U CN2010201395744U CN201020139574U CN201620851U CN 201620851 U CN201620851 U CN 201620851U CN 2010201395744 U CN2010201395744 U CN 2010201395744U CN 201020139574 U CN201020139574 U CN 201020139574U CN 201620851 U CN201620851 U CN 201620851U
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Abstract
A differential pressure type downhole choke is applied to gas downhole extraction choke, characterized in that, a lower end of a connecting bar is inserted into an upper end of a locking cylinder, the locking cylinder is mounted on an upper inner pipe, the upper inner pipe is connected with an upper piston, the upper inner pipe is provided with a spacing cylinder; a slip base is connected onto a spacing ring, the slip is hung on the slip base, a cone is connected with a slip sleeve and an external cylinder; a lower piston is connected with a locking ring base and a lower inner pipe, the external cylinder and a connecting ring is connected with an inner sleeve, a rubber cylinder and a pressing ring are sleeved on the inner sleeve, the lower inner pipe is connected with a gas nozzle base. The utility model has effects that the delivering and the delivering and the taking-out are easy, the operation is convenient, the downhole mounting can be implemented by controlling the delivering speed, the separating is convenient, the seal is reliable, without generating the clamping problem, the accident of clamping in a well bore can be avoided, the utility model is suitable for gas extraction in deep well or high voltage gas well and incline well.
Description
Technical field
The utility model relates to production gas technology field, oil field, and particularly a kind of downhole tool that taps natural gas is a kind of down-hole gas production restriction choke.
Background technology
In the natural gas extraction manufacturing process, a valve is installed in the wellhead assembly of gas well, with the gas production of control gas well, reach the purpose of steady production.The down-hole pressure of general gas well is very high, in the process of producing, because natural gas is by behind the valve, pressure reduces suddenly, and volume expands rapidly, can produce the effect of heat absorption, temperature can reduce, and the hydrate that is contained in the natural gas can freeze in valve, and the time has been grown, valve will be stopped up, influence the natural gas ordinary production.
A kind of restriction choke of installing in the down-hole is arranged at present, but the poorly sealed phenomenon of packing element takes place in this restriction choke sometimes, cause the throttling failure, rise to come out to change with regard to needs.But motionless situation can appear dragging in some restriction choke when tripping out, can not successfully it be put forward from the down-hole, even may the situation that wire rope is broken will be salvaged, so just caused accident, must take more complicated working measure to handle, consume more manpower and materials, not only prolong the activity duration, influence gas well production, also can increase operating expenses.When this restriction choke will trip out in well when needs, need earlier with under the weight in well, the bump restriction choke moves down it and trips out weight after loosening, is lowered to fisher again, it is pulled out in well, complex technical process, time-consuming.For a long time, do not have a kind of better restriction choke, can solve the problem that is run in the above gas production work, become a difficult problem in the gas production work.
The utility model content
The purpose of this utility model is: a kind of differential pressure underground throttle device is provided, its is thrown in the down-hole or from the down-hole pull out easily, and be applicable in deep-well and inclined shaft and use.
The technical solution adopted in the utility model is: differential pressure underground throttle device, by urceolus, go up in pipe, down in pipe, slip spider, slips, packing element, valve, cover body, screen cloth, outer cover form, the upper end screw thread of connecting rod is connected with fishing head.It is characterized in that: cylinder bodily form connecting rod has centre bore, and connecting rod lower end outer wall has a ring-shaped step that outwards protrudes, and stationary pipes has the stairstepping endoporus.The upper end of stationary pipes is enclosed within on the outer wall of connecting rod, and stationary pipes lower end inwall contacts with the ring-shaped step outer wall of connecting rod, and step has certain sliding distance in the ring-shaped step of connecting rod and the stationary pipes.There is pin hole upper end in stationary pipes, by pin connecting rod is fixed on the inwall of stationary pipes.
The lower end of connecting rod is inserted in the centre bore of locking tube upper end, and the pawl of projection is arranged on the top of locking tube.There is annular groove at middle part at the stationary pipes inwall, the pawl that locks tube is locked in the groove at middle part in the stationary pipes.The top of locking jacket casing pipe in last, on the outer wall of pipe, the upper end of pipe contacted with the connecting rod lower surface in going up in locking tube lower end was fixed on by internal thread.Locking tube in last, manage and stationary pipes between annular space in.There is the ring cylinder of outside protrusion the lower end of pipe in going up, and the ring cylinder external surface has external screw thread, and the lower end of pipe is connected the upper end of upper piston in going up by external screw thread.Upper piston is a circular cylinder, and upper piston has the stepped central hole, studs with lock tube in upper piston central upper portion hole, and lock tube is the annular cylinder, at the inner surface of lock tube spiral is arranged.In last, a position-limiting drum is arranged, the pawl of the oriented outer lug in bottom of position-limiting drum in the pipe lower end; In the groove of position-limiting drum bottom pipe lower end inwall in the pawl of outer lug embeds upward.
On the external wall of upper portion of stationary pipes, be fixed with pressure cap, on the bottom of pressure cap and outer wall, be with the compression spring, on the bottom of compression spring and outer wall, be with a ring-type spacing ring in stationary pipes in stationary pipes by screw thread.Be evenly distributed with four horizontal square holes on spacing ring top, in horizontal square hole, insert the spacing lock dog of a box-shaped respectively, spacing lock dog is a cylinder, the longitudinal section is a cuboid, cross section is fan-shaped, there is arc surface the inside and outside, inner arc surface is identical with the radius of the outer wall annular groove inner arc surface of stationary pipes, exterior arc surface is identical with spacing ring top exradius, the upper and lower end parts of spacing lock dog inner arc surface is the oblique angle, identical with the outer wall annular groove upper and lower side oblique angle of stationary pipes, when spacing ring during to lower slider, spacing lock dog can outwards move in the footpath.At the outer wall of stationary pipes middle part annular groove is arranged, when spacing ring drove spacing lock dog and upwards slides, spacing lock dog can embed in the stationary pipes outer wall annular groove.Be fixed with lock nut and slip spider by screw thread on the outer wall of spacing ring and in the bottom of spacing lock dog, lock nut plays the effect of regulating the slip spider height and locking slip spider.Slip spider is cylindric, is evenly distributed with four square openings in the lower end of slip spider, hangs with a slips respectively in the square opening that hangs tag watt.Slips is the segment shape, and the upper end outer wall has the suspension groove.On the outer wall of slips lower end slip insert is arranged, slips lower end inwall has the inclined-plane.Slip sleeve is cylindric, there is the inclined-plane of outside protrusion the slip sleeve upper end, for conveniently going into the well, spacing ring is driven spacing lock dog upwards to slide, when spacing lock dog can embed in the stationary pipes outer wall annular groove, in the slips upper end on inclined-plane and the slip sleeve inclined-plane contact joint close, the slips bottom rotates to rigid body, and in contract in rigid body.There is external screw thread the lower end of slip sleeve.Slip sleeve is enclosed within on the outer wall of interior pipe.Screw thread is fixed with cone in the slip sleeve lower end, and cone is cylindric, and there is taper seat the upper end of cone outer wall, and the gradient of taper seat is identical with the gradient on inclined-plane in the slips lower end, and its gradient is between 12～17 degree.The cone inwall has step, and on the ring cylinder upper surface that outwards protruded the pipe lower end in cone inwall step was pressed in, and the cone inner wall sleeve is on the outer wall of upper piston upper end.Cone lower end external screw thread is connected with urceolus.
The upper piston lower end is fixed with an annular lock ring on the step of upper piston inwall in urceolus, spirality hangnail and longitudinal opening are arranged on the external surface of lock ring, and the upper end of lock ring contacts with the outer step lower surface of lock ring seat ring shape.The lock ring seat is the cylindric centre bore that has, and the upper end outer wall of lock ring seat is enclosed within on the inwall of locking tube lower end; Lock ring seat lower end outer wall has screw thread, the lock ring seat lower end lower piston that is threaded.In the annular space of the lower end of upper piston between lower piston and urceolus.
The urceolus lower end is connected with connecting ring by internal thread, connecting ring is connected with interior cover by inwall lower end screw thread, and interior cover is a cylindrical shape, is set with packing element and pressure ring on outer wall of inside race and in the lower end of connecting ring, there is outer step the outer wall of inside race lower end, hangs with pressure ring on the step outside the outer wall of inside race lower end.The upper end of pipe is by being threaded in the lower end of lower piston down.Interior cover is enclosed within down on the outer wall of interior pipe.Between the pipe annular space is arranged at pressure ring and down, on the outer wall of pressure ring, transverse holes is arranged.Transverse holes is that packing element is compressed back fluid tap hole.
There is external screw thread the lower end of pipe in down, and interior down pipe lower end is by the valve seat upper end that is threaded, and the pressure ring lower end connects the upper end of valve seat by internal thread.Be fixed with a cylinder bodily form valve in the valve seat lower central hole.Valve has centre bore, gas discharge under the valve centre bore energy control well.External screw thread is connected with cylindric cover body in the lower end of valve seat, and the annular solid of protrusion is arranged in the cover body, and the plane is pressed on the lower surface of valve on the projecting inward annular solid of cover body.
In order to filter natural gas, the prevention valve stops up, and is evenly distributed with transverse holes on the lower end wall of cover body, and is with screen cloth on the cover body lower end wall, on the outer wall of cover body screw thread is arranged, and is fixed with cylindric outer cover on the screw thread of cover body outer wall.
Described packing element, interior cover, pressure ring and following interior pipe have two groups, and two groups of packing elements, interior cover, pressure ring and interior down pipes are sleeved on down respectively on the outer wall of interior pipe continuously.
The beneficial effects of the utility model: (1) differential pressure underground throttle device is installed easily, and is easy to operate.By controlling lowering velocity on the ground, can be implemented in the down-hole this device is installed, utilize parts such as compression spring, lock dog, locking tube, can realize the process of device for opening at an easy rate, it can be installed on any design attitude in down-hole of gas-producing well.(2) packing is convenient, and sealing is reliable.Form an airtight space between upper piston, lower piston and the urceolus, its internal pressure is an atmospheric pressure, down the back forms bigger pressure reduction with pressure in the pit shaft in the well, utilizes this pressure reduction packing element can be compressed, make the packing element heaved with pit shaft closely packing live.According to actual conditions, can design suitable piston area.(3) in the process of going into the well, slips is in the state of contraction, can guarantee that there are a bigger spacing all the time in slip insert and tube inner wall, and the problem that can block does not avoid being stuck in the accident in the pit shaft.(4) trip out conveniently.When needs trip out restriction choke in well, only need to catch fishing head firmly and carry with throw in catcher, pin is cut off, can remove the packing of slips suspension effect and packing element, restriction choke is put forward from the down-hole.(5) applied widely.Each parts in this device can bear high pressure, are applicable in deep-well or high-pressure gas well and work, and also can be used for the inclined shaft gas production.
Description of drawings
Fig. 1 is that the first half of the utility model differential pressure underground throttle device is partly cutd open structural representation.
Fig. 2 is that the latter half of the utility model differential pressure underground throttle device is partly cutd open structural representation.
Among the figure: 1. fishing head, 2. connecting rod, 3. pin, 4. pressure cap, 5. compression spring, 6. stationary pipes, 7. spacing ring, 8. spacing lock dog, 9. lock nut, 10. locking tube, 11. slip spiders, 12. slip sleeves, 13. pipe in going up, 14. slips, 15. position-limiting drums, 16. cones, 17. lock tubes, 18. the lock ring seat, 19. lock rings, 20. upper pistons, 21. urceolus, 22. lower pistons, 23. connecting ring, 24. packing elements, cover in 25., 26. pressure rings, pipe in 27. times, 28. the valve seat, 29. valves, 30. cover bodies, 31. screen clothes, 32. outer covers.
The specific embodiment
Embodiment 1: with a differential pressure underground throttle device is example, and the utility model is described in further detail.
Differential pressure underground throttle device, by urceolus 21, go up in pipe 13, down in pipe 27, slip spider 11, slips 14, packing element 24, valve 29, cover body 30, screen cloth 31, outer cover 32 form, the upper end screw thread of connecting rod 2 is connected with fishing head 1.
Consult Fig. 1.Cylinder bodily form connecting rod 2 has centre bore, and connecting rod 2 lower end outer walls have a ring-shaped step that outwards protrudes, and stationary pipes 6 has the stairstepping endoporus.The upper end of stationary pipes 6 is enclosed within on the outer wall of connecting rod 2, and stationary pipes 6 lower end inwalls contact with the ring-shaped step outer wall of connecting rod 2, and the ring-shaped step of connecting rod 2 can limit stationary pipes 6 downward sliding distances.There is pin hole upper end in stationary pipes 6, by pin 3 connecting rod 2 is fixed on the inwall of stationary pipes 6.
The lower end of connecting rod 2 is inserted in the centre bore of locking tube 10 upper ends, and the top of locking tube 10 is evenly distributed with 8 longitudinal slots, and the top that locks tube 10 is slit into 8 distinguish, the lobed pawl in the top of each distinguish.There is annular groove at middle part at stationary pipes 6 inwalls, and the pawl that locks tube 10 is locked in the inner groovy at stationary pipes 6 middle parts.The top of pipe 13 in locking tube 10 is enclosed within, on the outer wall of pipe 13, the upper end of pipe 13 contacted with connecting rod 2 lower surfaces in going up in the lower end of locking tube 10 was fixed on by internal thread.Locking tube 10 in last, manage 13 and stationary pipes 6 between annular space in.There is the ring cylinder of outside protrusion the lower end of pipe 13 in going up, and the ring cylinder external surface has external screw thread, and the lower end of pipe 13 is connected the upper end of upper piston 20 in going up by external screw thread.Upper piston 20 is a circular cylinder, and upper piston 20 has the stepped central hole, studs with lock tube 17 in upper piston 20 central upper portion holes, and lock tube 17 is the annular cylinder, at the inner surface of lock tube 17 spiral is arranged.Pipe has a position-limiting drum 15 in 13 lower ends in last, and the bottom of position-limiting drum 15 is evenly distributed with 8 longitudinal slots, and the lower part of position-limiting drum 15 is slit into 8 distinguish, and the bottom of each distinguish has the pawl to outer lug.In the groove of position-limiting drum 15 bottoms pipe 13 lower end inwalls in the pawl of outer lug embeds upward.
On the external wall of upper portion of stationary pipes 6, be fixed with pressure cap 4 by screw thread, in the bottom of pressure cap 4 and on the outer wall of stationary pipes 6, be with one the compression spring 5, the compression spring 5 the bottom and on the outer wall of stationary pipes 6, be with a ring-type spacing ring 7.Be evenly distributed with four horizontal square holes on spacing ring 7 tops, in horizontal square hole, insert the spacing lock dog 8 of a box-shaped respectively.There is annular groove at outer wall middle part in stationary pipes 6, and when the spacing lock dog 8 of spacing ring 7 drives upwards slided, spacing lock dog 8 can embed in the stationary pipes 6 outer wall annular grooves.On the outer wall of spacing ring 7 and in the bottom of spacing lock dog 8, be fixed with lock nut 9 and slip spider 11 by screw thread, and by lock nut 9 lockings.Slip spider 11 is cylindric, is evenly distributed with four square openings in the lower end of slip spider 11, hangs with a slips 14 respectively in watts 14 the square opening of hanging tag.Slips 14 is the segment shape, and the upper end outer wall has the suspension groove.On the slips 14 lower end outer walls slip insert is arranged, slips 14 lower end inwalls have the inclined-plane.Slip sleeve 12 is cylindric, and there is the inclined-plane of outside protrusion slip sleeve 12 upper ends, and when slips 14 during to lower slider, inclined-plane, slip sleeve 12 upper end overhangs slips 14 lower ends outside the rigid body, and the interlock tube inner wall prevents that rigid body from moving up.There is external screw thread the lower end of slip sleeve 12.Slip sleeve 12 is enclosed within on the outer wall of interior pipe 13.Be fixed with cone 16 at slip sleeve 12 lower end screw threads, cone 16 is cylindric, and there is taper seat the upper end of cone 16 outer walls, and the gradient of taper seat is identical with the gradient on inclined-plane in slips 14 lower ends, and its gradient is 15 degree.Cone 16 inwalls have step, and on the ring cylinder upper surface that outwards protruded pipe 13 lower ends in cone 16 inwall steps were pressed in, and cone 16 inner wall sleeves are on upper piston 20 upper end outer walls.Cone 16 lower end external screw threads are connected with urceolus 21.
Consult Fig. 2.Urceolus 21 lower ends are connected with connecting ring 23 by internal thread, and the maximum outside diameter of connecting ring 23 is 57 millimeters, are applicable to 2: 7 oil pipe, in the seal groove of connecting ring 23 sealing ring are housed.Connecting ring 23 is connected with interior cover 25 by inwall lower end screw thread, interior cover 25 is a cylindrical shape, be set with packing element 24 and pressure ring 26 on interior cover 25 outer walls and in the lower end of connecting ring 23, there is the outer step of an annular interior cover 25 outer wall lower ends, hang with pressure ring 26 on the step outside interior cover 25 outer wall lower ends.The upper end of pipe 27 is by being threaded in the lower end of lower piston 22 down.Interior cover 25 is enclosed within down on the outer wall of interior pipe 27.Between the pipe 27 annular space is arranged at pressure ring 26 and down, transverse holes (air vent) is arranged on the outer wall of pressure ring 26.Transverse holes is that packing element 24 is compressed back fluid tap hole.The both ends of the surface up and down of the upper surface of pressure ring 26 and packing element are the plane, two cover packing element, interior cover and pressure rings are installed in the present embodiment, second connecting ring is connected with pressure ring 26 by screw thread, second pressure ring, packing element are sleeved in second and put, and second pressure ring is connected with valve seat 28 upper ends by screw thread.The upper end of pipe 27 is connected by the lower end of screw thread with lower piston 22 down, and the lower end of lower piston 22 is sitting on the connecting ring 23.
There is external screw thread the lower end of pipe 27 in down, down in pipe 27 lower ends by being threaded valve seat 28 upper ends, and pressure ring 26 lower ends are by the upper end of internal thread connection valve seat 28.Be fixed with a cylinder bodily form valve 29 in the valve seat 28 lower central holes.Valve 29 has centre bore, gas discharge under the valve 29 centre bores energy control well.Valve 29 is by ceramic material, and the valve according to the different replaceable different-diameters of gas well gas production is equipped with sealing ring between valve 29 and the valve seat 28.Be connected with cylindric cover body 30 at the lower end of valve seat 28 external screw thread, the annular solid of protrusion is arranged in the cover body 30, the plane is pressed on the lower surface of valve 29 on the projecting inward annular solid of cover body 30.
On the lower end wall of cover body 30, be evenly distributed with five horizontal rows to aperture, and on cover body 30 lower end walls, be with screen cloth 31, on the outer wall of cover body 30, screw thread is arranged, be fixed with cylindric outer cover 32 on the screw thread of cover body 30 outer walls.
The operating principle of differential pressure underground throttle device and using method: consult Fig. 1 and Fig. 2.
One, when restriction choke is installed in the down-hole, the stationary pipes 6 of wire rope by dropping feeder and this device linked together, make the inserted link of dropping feeder extend into position-limiting drum 15 lower ends, the lower end of position-limiting drum 15 is strutted, its pawl head is stuck in the annular inner groovy of interior pipe 13 lower ends, this moment, position-limiting drum 15 withstood lock ring seat 18, made upper piston 20, and lower piston 22 can not relative motion.On push away spacing ring 7 and compression press spring 5, spacing lock dog 8 is stuck in the outer groove of annular of stationary pipes 6, cutting ferrule with dropping feeder entangles spacing lock dog 8, slips 14 is when moving on the spacing ring 7, the conical surface of inclined-plane and slip sleeve 12 upper ends interacts in its upper end, forces the lower end of slips 14 inwardly to be shunk, and is attached on slip sleeve 12 peripheries, the facing external diameter of slips 14 is less than the external diameter of urceolus 21, with lock nut 9 lockings at this moment.Transfer in the well reposefully then, in the time that the precalculated position will be reached, accelerate lowering velocity, bring to a halt when making it reach disengage speed, this moment, wire rope was just held stationary pipes 6, spacing lock dog 8 skids off in groove, and under the effect of compression spring and gravity, spacing ring 7, slip spider 11, slips 14 are to lower slider, slips 14 outwards moves along the conical surface on the cone 16, can interlock be suspended on the tube inner wall.Carry steel wire then, the center-pole of dropping feeder is extracted, make position-limiting drum 15 losing locks, discharge blocked piston, go up lower piston immediately under the borehole pressure effect, do relative motion, air in the secret room is compressed, be connected with lower piston 22 following in pipe 27 drive on the pressure rings 26 and move, heave after packing element 24 is compressed, the oil pipe packing is lived, and lock ring 19 locks together with lock tube 17 simultaneously.
Two, need be when the down-hole trips out restriction choke, steel wire is connected the throw in catcher G.I.H and fishing head 1 connects, upwards lift steel wire then, pin 3 is cut off, this moment fishing head 1, move on the connecting rod 2, extract from the upper end of locking tube 10 lower end of connecting rod 2, make the pawl head losing lock of locking tube 10, drive then on the stationary pipes 6 and move, make the pawl head of locking tube 10 leave stationary pipes 6 inner groovies, stationary pipes 6 is with fishing head 1, connecting rod 2 drives on spacing ring 7 and the slips 14 and moves, at this moment the conical surface of inclined-plane and slip sleeve 12 upper ends interacts in slips 14 upper ends, force slips 14 bottoms to be shunk, and be attached on slip sleeve 12 peripheries, remove the interlock of slips 14 and tubing wall to the center.Carry steel wire in the continuation, move on slips 14 drives watt cover 12 and cone 16, urceolus 21, the connecting ring 23, be sealed in packing element 24 on the oil pipe this moment under the frictional force effect, promote pressure ring 26, valve seat 28, down in pipe 27, lower piston 22 and upper piston 20, go up in pipe 13 and locking tube 10 move down together, packing element 24 deblockings,, restriction choke can be come out from the down-hole to straight-cylindrical state from compressed recovering state.
Claims (4)
1. differential pressure underground throttle device, by urceolus (21), go up in pipe (13), down in pipe (27), slip spider (11), slips (14), packing element (24), valve (29), cover body (30), screen cloth (31), outer cover (32) form, the upper end screw thread of connecting rod (2) is connected with fishing head (1); It is characterized in that: cylinder bodily form connecting rod (2) has centre bore, connecting rod (2) lower end outer wall has a ring-shaped step that outwards protrudes, stationary pipes (6) has the stairstepping endoporus, the upper end of stationary pipes (6) is enclosed within on the outer wall of connecting rod (2), stationary pipes (6) lower end inwall contacts with the ring-shaped step outer wall of connecting rod (2), the ring-shaped step restriction stationary pipes (6) of connecting rod (2) is sliding distance downwards, there is pin hole upper end in stationary pipes (6), by pin (3) connecting rod (2) is fixed on the inwall of stationary pipes (6);
The lower end of connecting rod (2) is inserted in the centre bore of locking tube (10) upper end, the pawl that projection is arranged on the top of locking tube (10), there is annular groove at middle part at stationary pipes (6) inwall, the pawl that will lock tube (10) is locked in the inner groovy at stationary pipes (6) middle part, the top of pipe (13) in locking tube (10) is enclosed within, in being fixed on by internal thread, the lower end of locking tube (10) manages on the outer wall of (13), the upper end of pipe (13) contacts with connecting rod (2) lower surface in going up, locking tube (10) is managed in last in the annular space between (13) and the stationary pipes (6), there is the ring cylinder of outside protrusion the lower end of pipe (13) in going up, the ring cylinder external surface has external screw thread, the lower end of pipe (13) is connected the upper end of upper piston (20) in going up by external screw thread, upper piston (20) is a circular cylinder, upper piston (20) has the stepped central hole, in upper piston (20) central upper portion hole, stud with lock tube (17), lock tube (17) is the annular cylinder, inner surface at lock tube (17) has screw thread, in last, a position-limiting drum (15) is arranged, the pawl of the oriented outer lug in bottom of position-limiting drum (15) in pipe (13) lower end; In the groove of position-limiting drum (15) bottom pipe (13) lower end inwall in the pawl of outer lug embeds upward;
On the external wall of upper portion of stationary pipes (6), be fixed with pressure cap (4) by screw thread, in the bottom of pressure cap (4) and on the outer wall of stationary pipes (6), be with the compression spring (5), the compression spring (5) the bottom and on the outer wall of stationary pipes (6), be with a ring-type spacing ring (7), be evenly distributed with four horizontal square holes on spacing ring (7) top, in horizontal square hole, insert the spacing lock dog (8) of a box-shaped respectively, there is annular groove at outer wall middle part in stationary pipes (6), when spacing ring (7) drives spacing lock dog (8) when upwards sliding, spacing lock dog (8) can embed in stationary pipes (6) the outer wall annular groove, on the outer wall of spacing ring (7) and in the bottom of spacing lock dog (8), be fixed with lock nut (9) and slip spider (11) by screw thread, lock nut (9) plays the effect of regulating slip spider (11) height and locking slip spider (11), slip spider (11) is cylindric, be evenly distributed with four square openings in the lower end of slip spider (11), in watt square opening of (14) that hangs tag, hang with a slips (14) respectively, slips (14) is the segment shape, the upper end outer wall has the suspension groove, on the outer wall of slips (14) lower end slip insert is arranged, slips (14) lower end inwall has the inclined-plane, slip sleeve (12) is cylindric, and there is the inclined-plane of outside protrusion slip sleeve (12) upper end; There is external screw thread the lower end of slip sleeve (12), manage on the outer wall of (13) in slip sleeve (12) is enclosed within, screw thread is fixed with cone (16) in slip sleeve (12) lower end, cone (16) is cylindric, there is taper seat the upper end of cone (16) outer wall, the gradient of taper seat is identical with the gradient on inclined-plane in slips (14) lower end, its gradient is between 12～17 degree, cone (16) inwall has step, on the ring cylinder upper surface that outwards protruded pipe (13) lower end in cone (16) inwall step was pressed in, and cone (16) inner wall sleeve is on the outer wall of upper piston (20) upper end, and cone (16) lower end external screw thread is connected with urceolus (21);
Upper piston (20) lower end is in urceolus (21), on the step of upper piston (20) inwall, be fixed with an annular lock ring (19), on the external surface of lock ring (19) spirality hangnail and longitudinal opening are arranged, the upper end of lock ring (19) contacts with the outer step of lock ring seat (18) annular lower surface, lock ring seat (18) is the cylindric centre bore that has, and the upper end outer wall of lock ring seat (18) is enclosed within on the inwall of locking tube (10) lower end; Lock ring seat (18) lower end outer wall has screw thread, and lock ring seat (18) the lower end lower piston (22) that is threaded is in the annular space of the lower end of upper piston (20) between lower piston (22) and urceolus (21);
Urceolus (21) lower end is connected with connecting ring (23) by internal thread, connecting ring (23) is connected with interior cover (25) by inwall lower end screw thread, interior cover (25) is a cylindrical shape, on interior cover (25) outer wall and in the lower end of connecting ring (23), be set with packing element (24) and pressure ring (26), there is outer step interior cover (25) outer wall lower end, outside interior cover (25) outer wall lower end, hang with pressure ring (26) on the step, the upper end of pipe (27) is by being threaded in the lower end of lower piston (22) down, manage on the outer wall of (27) in interior cover (25) is enclosed within down, between the pipe (27) annular space is arranged at pressure ring (26) and down, transverse holes is arranged on the outer wall of pressure ring (26);
There is external screw thread the lower end of pipe (27) in down, pipe (27) lower end is by valve seat (28) upper end that is threaded down, and pressure ring (26) lower end connects the upper end of valve seat (28) by internal thread, valve seat (28) is fixed with a cylinder bodily form valve (29) in the lower central hole, valve (29) has centre bore, gas discharge under valve (29) the centre bore energy control well, lower end external screw thread at valve seat (28) is connected with cylindric cover body (30), the annular solid that protrusion is arranged in the cover body (30), the plane is pressed on the lower surface of valve (29) on the projecting inward annular solid of cover body (30).
2. differential pressure underground throttle device as claimed in claim 1, it is characterized in that: on the lower end wall of cover body (30), be evenly distributed with transverse holes, and on cover body (30) lower end wall, be with screen cloth (31), on the outer wall of cover body (30), screw thread is arranged, be fixed with cylindric outer cover (32) on the screw thread of cover body (30) outer wall.
3. differential pressure underground throttle device as claimed in claim 1 or 2, it is characterized in that: described packing element (24), interior cover (25), pressure ring (26) and following interior pipe (27) have two groups, and two groups of packing elements (24), interior cover (25), pressure ring (26) and following interior manage (27) are sleeved on down respectively on the outer wall of interior pipe (27) continuously.
4. differential pressure underground throttle device as claimed in claim 1 or 2, it is characterized in that: spacing lock dog (8) is a cylinder, the longitudinal section is a cuboid, cross section is fan-shaped, there is arc surface the inside and outside, and inner arc surface is identical with the radius of the outer wall annular groove inner arc surface of stationary pipes (6), and exterior arc surface is identical with spacing ring (7) top exradius, the upper and lower end parts of spacing lock dog (8) inner arc surface is the oblique angle, and is identical with the outer wall annular groove upper and lower side oblique angle of stationary pipes (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201395744U CN201620851U (en) | 2010-03-10 | 2010-03-10 | Differential pressure type downhole choke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201395744U CN201620851U (en) | 2010-03-10 | 2010-03-10 | Differential pressure type downhole choke |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201620851U true CN201620851U (en) | 2010-11-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201395744U Expired - Lifetime CN201620851U (en) | 2010-03-10 | 2010-03-10 | Differential pressure type downhole choke |
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| Country | Link |
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| CN (1) | CN201620851U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798913A (en) * | 2010-03-10 | 2010-08-11 | 中国石油天然气股份有限公司 | Differential pressure underground throttle device |
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2010
- 2010-03-10 CN CN2010201395744U patent/CN201620851U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798913A (en) * | 2010-03-10 | 2010-08-11 | 中国石油天然气股份有限公司 | Differential pressure underground throttle device |
| CN101798913B (en) * | 2010-03-10 | 2012-11-14 | 中国石油天然气股份有限公司 | Differential pressure underground throttle device |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20101103 Effective date of abandoning: 20130227 |
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| RGAV | Abandon patent right to avoid regrant |