CN209818037U - Underground throttle - Google Patents

Abstract

The application provides an underground throttler, which comprises a central pipe, wherein two ends of the central pipe are respectively provided with a fishing and deblocking mechanism and a seat seal self-locking mechanism, a clamping and sealing mechanism is arranged between the fishing and unsealing mechanism and the seat seal self-locking mechanism, the fishing and unsealing mechanism comprises a sleeve, a supporting tube, a slip support and a locking ball, the sleeve is sleeved on the central tube and is sleeved with one end of the supporting tube, the other end of the supporting tube is in limit connection with the seat seal self-locking mechanism, the slip support is sleeved on the supporting pipe and is in limit connection with a hanging cap sleeved on the sleeve pipe, the locking ball is limited on the slip holder through a sleeve and enables the slip holder and the supporting tube to be locked along the direction of the axis of the central tube, the clamping and sealing mechanism is sleeved on the side wall of the supporting pipe and is respectively connected with the slip support and the seat seal self-locking mechanism.

Description

Underground throttle

Technical Field

The application relates to the technical field of gas well production downhole throttling and heat insulating tools, in particular to a downhole throttling device.

Background

At present, gas well production mainly depends on stratum energy to maintain production, so that the purposes of saving energy, reducing consumption and improving economic benefits are achieved by avoiding using external supplied energy and power, therefore, for a gas well with higher stratum energy, underground gas can be completely lifted to the ground by means of the energy of the gas well, but the ground remote high-pressure transmission cost is high and unsafe, and a gas well terminal cannot be used. If the ground is adopted for reducing the pressure and then conveying the gas, the gas can absorb and take away a large amount of heat energy when the pressure is suddenly reduced at the wellhead, so that the wellhead absorbs water vapor to quickly freeze and cannot continue to produce, a series of heat energy supply systems matched with the ground are needed to ensure that the wellhead does not freeze to maintain normal production, the investment of the ground heat supply system and the process is increased, and meanwhile, the fuel supply cost is high and the environment is polluted.

Therefore, in the prior art, the underground throttle with the throttle valve and the matched tool thereof are placed in the oil pipe at a proper position through a steel wire operation mode clamping seat to form a partition and seal all channels except the valve, so that the purpose of reducing the pressure of natural gas after throttling through the valve of the underground throttle is achieved. Although the temperature reduces simultaneously at depressurization in-process, owing to receive the restriction of stratum constant temperature, the natural gas can fully absorb the geothermal energy in the pit shaft when the cooling, throws away when the natural gas of lower pressure reachs the well head and keeps higher temperature, and ground need not throttle once more and steps down, can not appear the cooling process, but direct teletransmission and utilization.

However, the common problem of the current domestic throttle devices is that the throttle devices cannot be lifted up to release resistance when encountering resistance in the process of descending into a well, and once lifted up, the throttle devices are fixed and sealed to prevent the throttle devices from descending to the designed position; the success rate of salvage deblocking is low, and the gas cock that needs to change the flow controller has the gas cock of some occasionally and can't be fished out the change. The slip is mainly used for the reason that the slip is pressed down along the inner wall of an oil pipe and is set when the slip is lifted, so that the conventional throttling device can only be pressed down and cannot be lifted, the slip is required to be loosened firstly when the slip is lifted and is clamped on the inner wall of the oil pipe to be clamped difficultly, and the comprehensive popularization of the throttling and pressure reducing process of the oil exploitation natural gas well is influenced.

SUMMERY OF THE UTILITY MODEL

The application aims to overcome the defects of the prior art and provide a downhole choke.

In order to achieve the purpose, the following technical scheme is adopted in the application:

an underground choke comprises a central pipe 11, wherein two ends of the central pipe 11 are respectively provided with a fishing and unsealing mechanism and a seat seal self-locking mechanism, a clamping and sealing mechanism is arranged between the fishing and unsealing mechanism and the setting and self-locking mechanism, the fishing and unsealing mechanism comprises a sleeve 4, a supporting tube 12, a slip holder 10 and a locking ball 9, the sleeve 4 is sleeved on the central tube 11 and is sleeved with one end of the supporting tube 12, the other end of the supporting tube 12 is in limit connection with the seat seal self-locking mechanism, the slip holder 10 is sleeved on the supporting tube 12 and is in limit connection with the hanging cap 5 sleeved on the sleeve 4, the locking ball 9 is limited and arranged on the slip holder 10 through the sleeve 4 and locks the slip holder 10 and the supporting pipe 12 along the direction of the axis of the central pipe 11, the clamping and sealing mechanism is sleeved on the side wall of the supporting tube 12 and is respectively connected with the slip holder 10 and the seat seal self-locking mechanism.

Optionally, the underground throttler further comprises a connecting and delivering mechanism and a filtering throttling mechanism, one end of the connecting and delivering mechanism is connected with the central pipe 11 through the sleeve 4, the other end of the connecting and delivering mechanism is connected with a delivering tool of the steel wire operating machine, and the filtering throttling mechanism is arranged at a position, far away from the central pipe 11, of the end part of one end of the salvaging and deblocking mechanism and is connected with the seat sealing self-locking mechanism.

Optionally, salvage deblocking mechanism still including carrying link 7 and deblocking shear pin 8, carry the inner peripheral surface of link 7 with thereby 4 threaded connection of sleeve pipe will carry link 7 fixed mounting in on the sleeve pipe 4, be equipped with the shear pin annular on carrying link 7's the outer peripheral face, deblocking shear pin 8 sets up on the lateral wall of slips support 10 and with the shear pin annular cooperatees, constitutes sleeve pipe 4 with the spacing setting mechanism of slips support 10.

Optionally, the slip bowl 10 is a tubular structure with an equal diameter on the outer peripheral surface, and includes a first inner diameter portion 1001, a second inner diameter portion 1002, a third inner diameter portion 1005 and a fourth inner diameter portion 1006 that are communicated, an internal thread connected to the hanging cap 5 is provided on the sidewall of the first inner diameter portion 1001, radial shear pin threaded holes 1003 for installing the deblocking shear pins 8 are uniformly distributed on the sidewall of the second inner diameter portion 1002, an annular lock ball groove 1004 for accommodating the lock ball 9 is provided on the inner side of the third inner diameter portion 1005, and three chutes 1007 connected to the locking sealing mechanism are uniformly distributed on the end of the fourth inner diameter portion 1006 far away from one end of the first inner diameter portion 1001.

Optionally, the seat seal self-locking mechanism includes a rubber cylinder holder 16, a lock ring holder 17, a lock ring 18 and a lock ring holder 19, the lock ring 18 is sleeved on the end of the support tube 12 and is in limit fit with the support tube 12, the lock ring holder 17 is sleeved on the outer side of the lock ring 18 and is installed on the inner circumferential surface of one end of the lock ring holder 19, the rubber cylinder holder 16 is sleeved on the support tube 12 and is in threaded connection with the outer circumferential surface of one end of the lock ring holder 19, and the other end of the lock ring holder 19 is matched with the inner circumferential surface of the end of the center tube 11.

Optionally, the supporting tube 12 includes a supporting tube diameter-expanding section 121 and a supporting tube body 123, a set of radial through holes 122 for installing the locking balls 9 is provided on a side wall of the supporting tube diameter-expanding section 121, a first unidirectional sawtooth lock catch 124 is provided on an outer wall of one end of the supporting tube body 123 far away from the supporting tube diameter-expanding section 121, and a sealing surface is provided on an inner wall of one end of the supporting tube body 123 far away from the supporting tube diameter-expanding section 121.

Optionally, the lock ring 18 is of a ring-shaped structure, and includes a lock ring body 181, an outer tapered surface 182 is disposed on an outer circumferential surface of an end portion of the lock ring body 181, the outer tapered surface cooperating with the lock ring holder 17, and a second one-way saw-tooth lock 183 cooperating with the first one-way saw-tooth lock 124 is disposed on an inner circumferential surface of an end portion of the lock ring body 181.

Optionally, the clamping and sealing mechanism comprises a slip 13, a wedge 14 and a sealing rubber cylinder 15, the slip 13 is arranged on the side wall of the supporting tube 12 in a sleeved mode, one end of the slip 13 is connected with the slip holder 10, the other end of the slip 13 is connected with one end of the wedge 14 in a sliding mode, the other end of the wedge 14 is connected with one end of the sealing rubber cylinder 15 in a butting mode, and the other end of the sealing rubber cylinder 15 is connected with a seat sealing self-locking mechanism in a butting mode.

Optionally, the connection and delivery mechanism comprises a joint 1, a shearing pin 2 and a hanging pipe 3, one end of the hanging pipe 3 is sleeved in the sleeve 4 and connected with the end of the central pipe 11, the other end of the hanging pipe 3 is fixedly connected with one end of the joint 1 through the shearing pin 2, and the other end of the joint 1 is connected with the delivery tool of the steel wire operation machine.

Optionally, the filtering throttling mechanism includes an adjusting stabilizing pin 20, an air faucet 21, a connecting cap 22 and a filter screen cover 23, the air faucet 21 is disposed in the central tube 11, the filter screen cover 23 is sleeved on the outer peripheral surface of the end portion of the central tube 11 and supports the end portion of the air faucet 21 so as to limit the air faucet 21, one end of the connecting cap 22 is sleeved on the outer peripheral surface of the filter screen cover 23 and is limited by an annular boss disposed on the inner peripheral surface of the connecting cap 22, and the other end of the connecting cap 22 is screwed with the lock ring support sleeve 19 of the self-locking mechanism and is adjusted and fixed by the adjusting stabilizing pin 20.

Optionally, the center tube 11 is a drift diameter-shaped structure be equipped with the first seal groove 111 of installation sealing washer 6 on the outer peripheral face of center tube 11 one end, with be connected and deliver mechanism matched with external screw thread and sealed face be equipped with respectively on the outer peripheral face and the inner peripheral face of the center tube 11 other end with seat self-locking mechanism matched with external screw thread and the second seal groove 112 that is used for installing sealing washer 6 the middle part of center tube 11 is close to be equipped with evagination ring 113 on the outer peripheral face of second seal groove 112 one end and set up and be in the third seal groove 114 that is used for installing sealing washer 6 on the evagination ring 113.

The utility model provides an underground throttle is before the setting of going into the well, and its card clamping sealing mechanism is located all the time within the maximum diameter of underground throttle, and seat self-locking mechanism passes through the axial compression card clamping sealing mechanism realizes the setting, consequently there is the clearance all the time with the pipe wall of oil pipe when going into the well of the underground throttle of this application, as long as the underground throttle of this application can lift or transfer wantonly and separate the resistance when meeting the resistance in the oil pipe with suitable steady speed, and can not appear thereby card clamping sealing mechanism sits and seals the action and can guarantee to transfer the position of design, simultaneously, the underground throttle of this application adopts lock ball formula structure, unblock the back card earlier when salvaging, unblock process is simple and repeatability high for the underground throttle of this application has advantages such as the well is smooth, the setting is convenient, sealed reliable, be convenient for salvage.

Drawings

FIG. 1 is a schematic diagram of the overall construction of a downhole choke according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a center tube of an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a connecting and delivering mechanism according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a fishing deblocking mechanism according to an embodiment of the present application;

FIG. 5 is a schematic structural view of a bushing in accordance with an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a hosting tube of an embodiment of the present application;

FIG. 7 is a schematic structural view of a slip bowl according to an embodiment of the present application;

fig. 8 is a schematic structural view of a locking seal mechanism according to an embodiment of the present application;

FIG. 9 is a schematic structural diagram of a wedge of an embodiment of the present application;

FIG. 10 is a schematic diagram of the construction of slips of an embodiment of the present application;

FIG. 11 is a schematic structural diagram of a seat seal self-locking mechanism according to an embodiment of the present application;

FIG. 12 is a schematic structural view of a staple holder of an embodiment of the present application;

FIG. 13 is a schematic structural view of a locking ring of an embodiment of the present application;

FIG. 14 is a schematic structural view of a filter throttle mechanism according to an embodiment of the present application;

FIG. 15 is a schematic structural view of a connector cap according to an embodiment of the present application;

FIG. 16 is a schematic representation of a downhole process of a downhole choke according to an embodiment of the present application;

FIG. 17 is a schematic illustration of a process for setting a downhole choke according to an embodiment of the present application;

FIG. 18 is a schematic illustration of a fishing process for a downhole choke according to an embodiment of the present application.

Reference numerals

1-joint, 2-shear pin, 3-lifting pipe, 4-casing, 5-hanging cap, 6-sealing ring, 7-lifting ring, 8-unsetting shear pin, 9-locking ball, 10-slip holder, 11-center pipe, 12-support pipe, 13-slip, 14-wedge, 15-sealing rubber cylinder, 16-rubber cylinder holder, 17-locking ring holder, 18-locking ring, 19-locking ring holder, 20-adjusting stable pin, 21-air tap, 22-connecting cap, 23-filter screen cover, 111-first sealing groove, 112-second sealing groove, 113-outward convex ring, 114-third sealing groove, 101-first joint body, 102-outward convex ring, 103-second joint body, 301-inner hole upper section, 302-middle section of inner hole, 303-lower section of inner hole, 401-annular boss, 402-cylindrical smooth surface, 403-necking section, 121-diameter expanding section of supporting tube, 122-radial through hole, 123-supporting tube body, 124-first unidirectional sawtooth lock catch, 1001-first inner diameter section, 1002-second inner diameter section, 1003-radial shear pin threaded hole, 1004-annular lock ball groove, 1005-third inner diameter section, 1006-fourth inner diameter section, 1007-inclined groove, 141-wedge body, 142-wedge groove, 143-inclined groove, 131-connecting part, 132-tooth, 133-boss, 191-first supporting sleeve section, 192-second supporting sleeve section, 193-third supporting sleeve section, 194-first stable pin hole, 181-locking ring body, 182-external conical surface, 183-second unidirectional sawtooth lock catch 221-first connecting part 222-second connecting part 223-second pin stabilizing hole.

Detailed Description

The following description of specific embodiments of the present application refers to the accompanying drawings.

In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used only to indicate relative positional relationships between relevant portions, and do not limit absolute positions of the relevant portions.

In this document, "first", "second", and the like are used only for distinguishing one from another, and do not indicate the degree and order of importance, the premise that each other exists, and the like.

In this context, "equal", "same", etc. are not strictly mathematical and/or geometric limitations, but also include tolerances as would be understood by a person skilled in the art and allowed for manufacturing or use, etc.

Unless otherwise indicated, numerical ranges herein include not only the entire range within its two endpoints, but also several sub-ranges subsumed therein.

The application provides a downhole choke, as shown in figure 1, which comprises a central pipe 11, wherein two ends of the central pipe 11 are respectively provided with a fishing and unsealing mechanism and a seat seal self-locking mechanism, a clamping and sealing mechanism is arranged between the fishing and unsealing mechanism and the setting and self-locking mechanism, the fishing and unsealing mechanism comprises a sleeve 4, a supporting tube 12, a slip holder 10 and a locking ball 9, the sleeve 4 is sleeved on the central tube 11 and is sleeved with one end of the supporting tube 12, the other end of the supporting tube 12 is in limit connection with the seat seal self-locking mechanism, the slip holder 10 is sleeved on the supporting tube 12 and is in limit connection with the hanging cap 5 sleeved on the sleeve 4, the locking ball 9 is limited and arranged on the slip holder 10 through the sleeve 4 and locks the slip holder 10 and the supporting pipe 12 along the direction of the axis of the central pipe 11, the clamping and sealing mechanism is sleeved on the side wall of the supporting tube 12 and is respectively connected with the slip holder 10 and the seat seal self-locking mechanism. The application discloses downhole choke ware is when going out well card and seals the operation, sleeve pipe 4 receives the impact force and follows center tube 11 to the direction motion of seat self-locking mechanism drives slip support 10 and trusteeship 12 action, slip support 10 and trusteeship 12 make the card of card sealing mechanism card is accomplished and is expanded the seat of downhole choke ware realizes the locking through lock ball 9, trusteeship 12's tip stretches into in the seat self-locking mechanism and spacing be used for guaranteeing card sealing mechanism reaches and maintains the ideal state at sealed requirement.

The underground throttleer is characterized in that a clamping sealing mechanism of the underground throttleer is always positioned within the maximum diameter of the underground throttleer before underground setting, and the setting self-locking mechanism axially compresses the clamping sealing mechanism to realize setting, so that a gap is always formed between the underground throttleer and the pipe wall of an oil pipe when the underground throttleer is in a well, as long as the underground throttleer can be arbitrarily lifted or placed for unblocking when being blocked at a proper stable speed in the oil pipe, and the clamping sealing mechanism can not be set to guarantee the underground throttleer to be placed to a designed position, meanwhile, the underground throttleer adopts a ball locking structure, is unlocked firstly and then unblocked when being salvaged, has simple unlocking process and high repeatability, and has outstanding advantages compared with a cable claw structure in the prior art in the reliability of manufacturing, processing and using, the underground throttle has the advantages of smooth descending, convenient seat sealing, reliable sealing, convenient fishing and the like.

In one embodiment of the present application, as shown in fig. 1, the downhole choke further comprises a connecting and delivering mechanism, one end of which is connected to the base pipe 11 through the casing 4, and the other end of which is connected to a delivering tool of a wireline machine, the delivering tool comprising a jar or a weighted rod. The utility model provides an underground throttle is when going on the operation of the well card setting, will underground throttle connects in can the downward jarring on the jar knocker, again with the cap wire that steel wire workover rig connected the steel wire is connected and hoist in the well head blowout prevention intraductal to go into under the speed of the well of normal less than or equal to 60m/min, process under normal the well underground throttle needn't paste the lateral wall of oil pipe, can freely go into down, can not meet midway and block to sit and seal, and the speed of arriving is accelerated to transfer when predetermineeing the position take the altitude apart from, puts down the speed and reaches emergency brake under the condition of 250 +/-m/min, at this moment the underground throttle is urgent static, and the jar knocker on its upper portion strikes under the effect of descending inertial force sleeve pipe 4, and this impact makes thereby the inflation of the card sealing mechanism in the well accomplishes the card setting.

In an embodiment of the present application, as shown in fig. 1, the downhole choke further includes a filtering throttling mechanism, the filtering throttling mechanism is disposed at an end of the central pipe 11 far away from one end of the fishing unsealing mechanism and connected to the setting self-locking mechanism, and the filtering throttling mechanism can automatically start to perform downhole throttling, pressure reducing and atomizing operations.

Optionally, as shown in fig. 2, the central tube 11 is of a drift diameter-shaped structure, a first sealing groove 111 for mounting the sealing ring 6, an external thread and a sealing surface for connecting the delivery mechanism to match are arranged on the outer peripheral surface of one end of the central tube 11, a second sealing groove 112 for mounting the sealing ring 6 and an external thread for fitting the seat seal self-locking mechanism to match is respectively arranged on the outer peripheral surface and the inner peripheral surface of the other end of the central tube 11, and an outer convex ring 113 and a third sealing groove 114 for mounting the sealing ring 6 are arranged on the middle portion of the central tube 11 and near the outer peripheral surface of one end of the second sealing groove 112.

In the above embodiment, as shown in fig. 3, the connection and delivery mechanism includes a joint 1, a shearing pin 2, and a hanging pipe 3, one end of the hanging pipe 3 is sleeved in the sleeve 4 and connected to the end of the central pipe 11, the other end of the hanging pipe 3 is fixedly connected to one end of the joint 1 through the shearing pin 2, and the other end of the joint 1 is connected to the delivery tool of the steel wire working machine.

The connector 1 comprises a first connector body 101 and a second connector body 103 which are connected, an outer convex circular ring 102 for accident treatment fishing is arranged in the middle of the connector 1, external threads are arranged on the side wall of the first connector body 101 and used for being connected with a delivery tool of the steel wire operation machine, and a first radial shearing pin hole matched with the shearing pin 2 is formed in the second connector body 103. Carry pipe 3 and be the tubular structure of excircle isodiametric and cavity reducing, including hole upper segment 301, hole middle section 302 and hole hypomere 303 be equipped with on the hole upper segment 301 with the pinhole is radially cuted to 2 matched with seconds of shearing pin be equipped with the spacing platform of necking down on the inner wall of hole middle section 302 be equipped with on the inner wall of hole hypomere 303 be used for with the internal thread that the tip of center tube 11 is connected and with the sealed face that the lateral wall of center tube 11 laminated mutually.

In an embodiment of the present application, as shown in fig. 4, the fishing deblocking mechanism further includes a lifting ring 7 and a deblocking shear pin 8, the inner peripheral surface of the lifting ring 7 and the casing 4 are in threaded connection, so that the lifting ring 7 is fixedly installed on the casing 4, a shear pin ring groove is formed on the outer peripheral surface of the lifting ring 7, the deblocking shear pin 8 is disposed on the side wall of the slip support 10 and is matched with the shear pin ring groove, and the casing 4 and the slip support 10 are limited by the limiting setting mechanism.

In the above embodiment, as shown in fig. 5, an annular boss 401 for receiving impact is provided at one end of the sleeve 4, a neck-reducing section 403 and an internal thread matching with the hanging ring 7 are provided at the other end of the sleeve 4, and a cylindrical smooth surface 402 is provided on the side wall of the middle portion of the sleeve 4.

In the above embodiment, as shown in fig. 6, the supporting tube 12 includes a supporting tube expanding section 121 and a supporting tube body 123 connected to each other, a set of radial through holes 122 for installing the locking balls 9 is provided on a side wall of the supporting tube expanding section 121, a first unidirectional sawtooth lock catch 124 is provided on an outer wall of the supporting tube body 123 at an end away from the supporting tube expanding section 121, and a sealing surface is provided on an inner wall of the supporting tube body 123 at an end away from the supporting tube expanding section 121.

In the above embodiment, as shown in fig. 7, the slip bowl 10 is a tubular structure with an equal diameter on the outer peripheral surface, and includes a first inner diameter portion 1001, a second inner diameter portion 1002, and a third inner diameter portion 1005 that are communicated with each other, an internal thread for connecting with the cap 5 is provided on the sidewall of the first inner diameter portion 1001, radial shear pin screw holes 1003 for installing the decapsulation shear pins 8 are uniformly distributed on the sidewall of the second inner diameter portion 1002, an annular lock ball groove 1004 for accommodating the lock ball 9 is provided between the second inner diameter portion 1002 and the third inner diameter portion 1005, three inclined grooves 1007 connected with the locking sealing mechanism are uniformly distributed on the end of the third inner diameter portion 1005 that is far away from the first inner diameter portion 1001, and the inclined grooves 1007 are stepped and the angle of the inclined plane of the inclined grooves 1007 is equal to the angle of the tapered surface of the end of the inclined grooves 1007.

Optionally, as shown in fig. 4, the slip supporting and hanging cap 5 is of an annular structure, an inner circumferential surface of the slip supporting and hanging cap 5 is a drift diameter, and an outer circumferential surface of the slip supporting and hanging cap 5 is provided with an external thread and a limiting boss for matching with the slip support 10; the lifting hanging ring 7 is of an annular structure, a shear pin ring groove is formed in the outer peripheral face of the lifting hanging ring 7, and internal threads matched with the sleeve 4 are formed in the inner peripheral face of the lifting hanging ring 7.

In an embodiment of the present application, as shown in fig. 8, the locking sealing mechanism includes that the cover establishes slips 13, wedge 14 and sealing rubber tube 15 on the lateral wall of trusteeship 12, the one end of slips 13 with the slips holds in the palm 10 and is connected, the other end of slips 13 with the one end sliding connection of wedge 14, the other end of wedge 14 with the one end looks butt of sealing rubber tube 15, the other end and the seat of sealing rubber tube 15 are sealed self-locking mechanism looks butt.

In the above embodiment, as shown in fig. 9, the wedge body 14 is a cylindrical structure, and includes a wedge body 141, a plurality of wedge grooves 142 inclined toward the slips 13 are provided on an outer wall of the wedge body 141 near one end of the slips 13, one slip 13 is correspondingly installed in each wedge groove 142, inclined grooves 143 parallel to inclined surfaces of the wedge grooves 142 are provided on two sides of the wedge groove 142, and an inner conical surface 144 for protecting the packing rubber tube 15 is provided on an inner wall of the wedge body 141 near one end of the packing rubber tube 15.

In the above embodiment, as shown in fig. 10, a connection portion 131 connected to the inclined groove 1007 of the slip bowl 10 is provided at one end of the slip 13, a plurality of horse-teeth-shaped teeth 132 are provided at the other end of the slip 13, and symmetrical bosses 133 engaged with the inclined grooves 143 of the wedge 14 are provided on both side walls of the other end of the slip 13.

Alternatively, as shown in fig. 8, the axial interface of the packing rubber 15 may be an "M" shaped structure to facilitate the deformation seal.

The utility model provides an underground throttle is when going on the operation of the well card setting of going into well, the impact of jar ware makes a plurality of slips 13 constitution slips group follow thereby wedge 14 motion and inflation interlock are on oil pipe's inner wall, prevent underground throttle removal, and then continue to lift the steel wire for thereby sealed packing element 15 is compressed the inflation and hugs closely oil pipe's inner wall and accomplish the setting, continues again and pulls the steel wire, makes thereby shear pin 2 is sheared the giving up of underground throttle, the supporting connecting instrument in pit of the steel wire operation of play at last, for example jar ware etc. accomplish the setting process of underground throttle, the automatic atomizing work that begins of underground throttle.

In one embodiment of the present application, as shown in fig. 11, the seating self-locking mechanism includes a rubber cylinder holder 16, a lock ring holder 17, a lock ring 18, and a lock ring holder 19, the lock ring 18 is sleeved on the end of the support tube 12 and is in limit fit with the support tube 12, the lock ring holder 17 is sleeved on the outer side of the lock ring 18 and is mounted on the inner circumferential surface of one end of the lock ring holder 19, the rubber cylinder holder 16 is sleeved on the support tube 12 and is in threaded connection with the outer circumferential surface of one end of the lock ring holder 19, and the other end of the lock ring holder 19 is in fit with the inner circumferential surface of the end of the center tube 11.

In the above embodiment, as shown in fig. 12, the lock ring holder 19 is a tubular structure, and includes a first holder section 191, a second holder section 192, and a third holder section 193 that are connected to each other, the lock ring holder 17 and the lock ring 18 are sequentially sleeved on an inner circumferential surface of the first holder section 191, the rubber sleeve holder 16 is in threaded connection with an outer circumferential surface of the first holder section 191, the second holder section 192 and the central tube 11 are spaced to form a space for accommodating the holder tube 12, and an outer circumferential surface of the third holder section 193 is provided with an external thread and a first pin hole 194 that are matched with the filter throttle mechanism.

In the above embodiment, as shown in fig. 13, the locking ring 18 is a ring-shaped structure, and includes a locking ring body 181, an outer tapered surface 182 is provided on an outer circumferential surface of an end portion of the locking ring body 181 to be fitted to the locking ring holder 17, a second one-way saw-tooth lock 183 is provided on an inner circumferential surface of an end portion of the locking ring body 181 to be fitted to the first one-way saw-tooth lock 124, and an opening having an appropriate width is provided along one of generatrices of the locking ring 18 so that the locking ring 18 has circumferential elasticity.

Optionally, as shown in fig. 11, the rubber cylinder holder 16 is of a circular ring structure, the outer circumferential surface of the rubber cylinder holder 16 is a circle with an equal diameter, one end of the inner circumferential surface of the rubber cylinder holder 16 is a circular ring, and the other end of the inner circumferential surface of the rubber cylinder holder 16 is expanded and provided with an internal thread for matching with the lock ring holder sleeve 19; the locking ring support 17 is of an annular structure, the outer peripheral surface of the locking ring support 17 is a circle with the same diameter, one end of the inner peripheral surface of the locking ring support 17 is a circle with the same diameter, and the other end of the inner peripheral surface of the locking ring support 17 is a reducing circle and forms a conical surface.

In one embodiment of the present application, as shown in fig. 14, the filtering throttle mechanism includes an adjusting pin 20, an air faucet 21, a connecting cap 22 and a filter screen cover 23, the filter screen cover 23 is sleeved on the outer peripheral surface of the end portion of the central tube 11 and supports the end portion of the air faucet 21 so as to limit the air faucet 21, one end of the connecting cap 22 is sleeved on the outer peripheral surface of the filter screen cover 23 and is limited by an annular boss provided on the inner peripheral surface of the connecting cap 22, and the other end of the connecting cap 22 is screwed with the lock ring holder 19 of the self-locking mechanism and is adjusted and fixed by the adjusting pin 20.

In the above embodiment, as shown in fig. 15, the connecting cap 22 is an annular structure, and includes a first connecting portion 221 and a second connecting portion 222 that are connected to each other, an internal thread that is engaged with an end portion of the lock ring holder 19 of the seat seal self-locking mechanism is provided on the first connecting portion 221, a second pin-stabilizing hole 223 for installing the adjusting pin 20 is provided on a side wall of the first connecting portion 221, an inner circumferential surface of the second connecting portion 222 is smaller than an inner circumferential surface of the first connecting portion 221, and an end portion of the screen cover 23 is fitted in the first connecting portion 221 and is engaged with the second connecting portion 222.

Optionally, as shown in fig. 14, the outer circumferential surface of the air faucet 21 is a sealing surface, and the inner circumferential surface of the air faucet 21 is a small through hole with inner cones at two ends; the connecting cap 22 is of a circular ring-shaped structure, an internal thread connecting buckle and a convex circular ring used for being clamped with the connecting cap 22 are respectively arranged on the outer peripheral surface and the inner peripheral surface of one end of the filter screen cover 23, a plurality of air-permeable gaps are formed in the other end of the filter screen cover 23, and a reducing circular ring used for being abutted to the central pipe 11 is arranged in the middle of the connecting cap 22.

The utility model provides an underground throttle is changing the air cock when salvaging the deblocking operation, and the steel wire operation is gone into down with fisher with normal speed and is apart from underground throttle suitable height, then transfers fast fisher make it with underground throttle collision can grasp underground throttle, and then lift the steel wire and start jar ware jarring to cut deblocking shear pin 8 and make the deblocking sealing mechanism deblocking continues to lift the steel wire and will accomplish the deblocking underground throttle plays the well head, thereby carries out to change air cock 21 and go into again and accomplish the operation again by the staff at last after the inspection maintenance according to the requirement.

The assembly process of the downhole choke of the application is as follows: sleeving the sleeve 4 on the outer peripheral surface of the lifting and hanging pipe 3 from the lower end, sleeving the hanging cap 5 on the outer peripheral surface of the middle part of the sleeve 4 according to the assembly direction, connecting the internal thread of the lifting and hanging ring 7 to the external thread of the fishing sleeve 4, installing a sealing ring 6 on the central pipe 11, coating sealing grease on the central pipe, and connecting the central pipe 11 with the thread of the lifting and hanging pipe 3 through the inner peripheral surface of the lower end of the sleeve 4 to enable the sealing surface to be matched and sealed; inserting the lower end (the end with the lock catch) of the supporting pipe 12 from the upper end of the slip bowl 10, aligning the radial through holes 122 of the supporting pipe 12 with the annular ball locking groove 1004 in the middle of the slip bowl 10, placing a ball locking 9 in each radial through hole 122 at the upper end of the supporting pipe 12, limiting the ball locking 9 in the annular ball locking groove 1004 of the slip bowl 10 by using sealing grease, integrally sleeving the combination of the slip bowl 10, the supporting pipe 12 and the ball locking 9 from the lower end of the central pipe 11, adjusting the sleeving position to align the radial shear pin threaded hole 1003 on the slip bowl 10 with the shear pin annular groove on the hanging ring 7, installing the release shear pin 8, and connecting the external thread of the hanging cap 5 with the internal thread of the slip bowl 10; sequentially and fittingly installing the slips 13, the wedge 14 and the sealing rubber cylinder 15 on the outer peripheral surface of the supporting pipe 12; sleeving the lock ring 18 in the lock ring support 17, placing the lock ring support 17 in a first support section 191 of the lock ring support sleeve 19, sleeving the whole body of the connected internal thread of the rubber cylinder support 16 and the external thread of the lock ring support sleeve 19 at the lower end of the rubber support pipe 12, connecting the internal thread at the bottom of the lock ring support sleeve 19 with the internal thread at the bottom of the central pipe 11, adjusting the position to enable the top of the rubber cylinder support 16 to be abutted against the lower end of the sealing rubber cylinder 15, installing the air tap 21 (the size of the internal hole of the air tap can be changed and adjusted according to the requirements of the gas well) at the bottom of the central pipe 11, penetrating the filter screen cover 23 from the top of the connecting cap 22 and hanging the filter screen cover at a second connecting part 222 at the bottom of the connecting cap 22, connecting the internal thread at the upper end of the connecting cap 22 with the external thread at the lower end of the ring support, and finally, inserting the lower end of the joint 1 into the upper section 301 of the inner hole at the upper end of the lifting pipe 3 and installing the shear pin 2 so as to complete the assembly of the downhole choke holder.

As shown in fig. 16 to 17, in the process of setting the downhole locking of the downhole choke of the present application, a jar in a steel wire operation delivery tool violently impacts on the annular boss 401 of the casing 4 under the action of inertia, and under the action of the suspension ring 7 and the locking ball 9, the casing 4 is impacted to move downwards to push the support pipe 12, the slip holder 10 and the suspension cap 5 together, so that the slips 13 move downwards and expand along the inclined surface of the wedge body 14 to be locked on the inner wall of the oil pipe; meanwhile, the sealing rubber sleeve 15 is axially compressed and radially expanded so as to seal the annular space between the supporting pipe 12 and the oil pipe, the supporting pipe 12 is inserted into the locking ring supporting sleeve 19 due to a setting self-locking mechanism consisting of the rubber sleeve support 16, the locking ring support 17, the locking ring 18 and the locking ring supporting sleeve 19, and only the supporting pipe can enter and cannot exit under the action of the first one-way sawtooth lock catch 124 and the second one-way sawtooth lock catch 183 to realize self-locking, if the sealing rubber sleeve 15 is not compressed to an ideal state required by sealing, the slip set 13 is pulled more and more tightly by lifting the joint 1, and the sealing rubber sleeve 15 is continuously compressed through the locking ring supporting sleeve 19, so that the sealing capacity is stronger and stronger, and under the condition that the pulling force reaches the optimal value of the designed setting, the shearing pin 2 is sheared, so that the downhole release is realized and the setting is completed.

In the clamping and setting process, the outer peripheral surface of the downhole choke is smaller than the inner peripheral surface of an oil pipe, the slip group 13 is contracted in the maximum outer peripheral surface of the downhole choke before setting, the sealing rubber sleeve 15 adopts a compression rubber sleeve and seals an annular space between the sealing rubber sleeve and the oil pipe by axial compression and radial expansion, so that all components are ensured to be in the maximum outer peripheral surface of the downhole choke before setting, any section in the oil pipe is stably lifted and lowered without relative displacement of the slip group 13 and the slip support 10, the slip group 13 cannot expand radially, and the downhole choke can be lowered to a designed position.

In the prior art, the slip structure of the existing clamping and sealing mechanism is provided with a self-hanging slip, the self-hanging slip of the choke adopting the self-hanging slip structure naturally droops to be in an expansion state in the underground vertical well descending process, the self-hanging slip can automatically move upwards for recovery when the choke occurs during the downward descending process but can not integrally lift up for releasing the clamp, the existing clamping and sealing mechanism generally adopts a leather cup type sealing rubber cylinder, the outer peripheral surface of the choke is the same as the inner peripheral surface of the oil pipe, the setting principle of the choke with the structure is that the self-hanging slips are clamped on the inner wall of the main oil pipe, the main slip is lifted to be continuously expanded and embedded into the inner wall of the oil pipe to complete clamping, the sealing is realized by pushing a leather cup to expand again through the pressure difference generated by the throttling of a leather cup rubber cylinder to complete the setting sealing, therefore, the choke is attached to the inner circumferential surface of the oil pipe, the choke cannot be lifted and released in the process of going down the well, the lifting is stopped and set, and the choke cannot be lowered to a designed position in the case of being lifted.

As shown in fig. 18, the fishing and unsetting process of the downhole choke of the present application is to put the fisher at a proper height from the downhole choke at a normal speed, quickly put the fisher down to strike and catch the annular boss 401 at the upper end of the casing 4, lift the wire to start the jar and shear the unsetting nail 8, continue to lift the wire to move the casing 4 up to move the lifting ring 7 up and catch the hanging cap 5, the lower end of the casing 4 is separated from the inner circle at the upper end of the hosting pipe 12 to form an annular space on the axial surface of the locking ball 9 to lose the locking effect, continue to lift the casing 4 to move the lifting ring 7 to pull the hanging cap 5 and the slip holder 10 up, the slip holder 10 pulls the slips 13 up, the slips 13 is pulled up to be completely retracted to the unsetting position, by the symmetrical bosses 133 of the slips 13 cooperating with the inclined grooves 143 of the wedge 14 to pull the wedge 14 up, and forming a space for restoring the sealing rubber cylinder 15, so that the slips 13 and the sealing rubber cylinder 15 are completely unfreezed, namely the underground choke is completely unsealed. And finally, the neck-reducing section 403 of the sleeve 4 is hung on the inner hole lower section 303 of the lifting and hanging pipe 3, so that the lifting and hanging pipe 3 drags the whole underground choke out of a wellhead through the central pipe 11, and a worker replaces the air tap 21 according to requirements after maintenance to complete operation again.

The preferred embodiments and examples of the present application have been described in detail with reference to the accompanying drawings, but the present application is not limited to the embodiments and examples described above, and various changes can be made within the knowledge of those skilled in the art without departing from the concept of the present application.

Claims (11)

1. A downhole choke, comprising: the fishing device comprises a central tube (11), wherein two ends of the central tube (11) are respectively provided with a fishing deblocking mechanism and a seat self-locking mechanism, a clamping and sealing mechanism is arranged between the fishing deblocking mechanism and the seat self-locking mechanism, the fishing deblocking mechanism comprises a sleeve (4), a hosting tube (12), a slip support (10) and a locking ball (9), the sleeve (4) is sleeved on the central tube (11) and is sleeved with one end of the hosting tube (12), the other end of the hosting tube (12) is in limit connection with the seat self-locking mechanism, the slip support (10) is sleeved on the hosting tube (12) and is in limit connection with a hanging cap (5) sleeved on the sleeve (4), the locking ball (9) is in limit connection with the slip support (10) through the sleeve (4) and enables the slip support (10) and the hosting tube (12) to be locked along the direction of the axis of the central tube (11), the clamping and sealing mechanism is sleeved on the side wall of the supporting pipe (12) and is respectively connected with the slip holder (10) and the seat seal self-locking mechanism.

2. The downhole choke according to claim 1, characterized in that the downhole choke further comprises a connection delivery mechanism and a filtering throttling mechanism, one end of the connection delivery mechanism is connected with the central pipe (11) through the casing (4), the other end of the connection delivery mechanism is connected with a delivery tool of a wire working machine, and the filtering throttling mechanism is arranged at the end of the central pipe (11) far away from one end of the fishing and unsealing mechanism and is connected with the seat seal self-locking mechanism.

3. The downhole choke according to claim 1, characterized in that the fishing deblocking mechanism further comprises a lifting ring (7) and a deblocking shear pin (8), the inner circumferential surface of the lifting ring (7) is in threaded connection with the casing (4) so as to fixedly mount the lifting ring (7) on the casing (4), a shear pin ring groove is formed in the outer circumferential surface of the lifting ring (7), and the deblocking shear pin (8) is arranged on the side wall of the slip holder (10) and is matched with the shear pin ring groove to form a limiting mechanism of the casing (4) and the slip holder (10).

4. The downhole choke according to claim 3, characterized in that the slip holder (10) is a tubular structure with the same diameter on the outer peripheral surface, and comprises a first inner diameter part (1001), a second inner diameter part (1002), a third inner diameter part (1005) and a fourth inner diameter part (1006) which are communicated with each other, an internal thread connected with the hood (5) is arranged on the side wall of the first inner diameter part (1001), radial shear pin threaded holes (1003) for installing the shear pins (8) are uniformly distributed on the side wall of the second inner diameter part (1002), an annular lock ball groove (1004) for accommodating the lock ball (9) is arranged on the inner side of the third inner diameter part (1005), and three inclined grooves (1007) connected with the clamping sealing mechanism are uniformly distributed on the end of the fourth inner diameter part (1006) far away from the first inner diameter part (1001).

5. The downhole choke according to claim 1, wherein the seat seal self-locking mechanism comprises a rubber barrel holder (16), a lock ring holder (17), a lock ring (18) and a lock ring holder sleeve (19), the lock ring (18) is sleeved on the end of the support pipe (12) and is in limit fit with the support pipe (12), the lock ring holder (17) is sleeved on the outer side of the lock ring (18) and is installed on the inner circumferential surface of one end of the lock ring holder sleeve (19), the rubber barrel holder (16) is sleeved on the support pipe (12) and is in threaded connection with the outer circumferential surface of one end of the lock ring holder sleeve (19), and the other end of the lock ring holder sleeve (19) is matched with the inner circumferential surface of the end of the central pipe (11).

6. A downhole choke according to claim 5, characterized in that the stinger (12) comprises a stinger expanding section (121) and a stinger body (123), a set of radial through holes (122) for mounting locking balls (9) is provided on the side wall of the stinger expanding section (121), a first one-way saw tooth lock catch (124) is provided on the outer wall of the stinger body (123) at the end away from the stinger expanding section (121), and a sealing surface is provided on the inner wall of the stinger body (123) at the end away from the stinger expanding section (121).

7. A downhole choke according to claim 6, characterized in that the lock ring (18) is a ring-shaped structure comprising a lock ring body (181), an outer tapered surface (182) mating with the lock ring holder (17) is provided on the outer circumferential surface of the end of the lock ring body (181), and a second one-way serration lock (183) mating with the first one-way serration lock (124) is provided on the inner circumferential surface of the end of the lock ring body (181).

8. The downhole choke according to claim 1, characterized in that the clamping sealing mechanism comprises a slip (13) sleeved on the side wall of the support pipe (12), a wedge-shaped body (14) and a sealing rubber cylinder (15), one end of the slip (13) is connected with the slip holder (10), the other end of the slip (13) is slidably connected with one end of the wedge-shaped body (14), the other end of the wedge-shaped body (14) is abutted to one end of the sealing rubber cylinder (15), and the other end of the sealing rubber cylinder (15) is abutted to a seat sealing self-locking mechanism.

9. A downhole choke according to claim 2, characterised in that the connection and delivery mechanism comprises a joint (1), a shear pin (2) and a lifting pipe (3), one end of the lifting pipe (3) is sleeved in the casing (4) and connected with the end of the central pipe (11), the other end of the lifting pipe (3) is fixedly connected with one end of the joint (1) through the shear pin (2), and the other end of the joint (1) is connected with the delivery tool of the wire-line working machine.

10. The downhole choke according to claim 2, characterized in that the filtering and throttling mechanism comprises an adjusting pin (20), an air tap (21), a connecting cap (22) and a filter screen cover (23), the air tap (21) is disposed in the central tube (11), the filter screen cover (23) is sleeved on the outer circumferential surface of the end of the central tube (11) and supports the end of the air tap (21) so as to limit the air tap (21), one end of the connecting cap (22) is sleeved on the outer circumferential surface of the filter screen cover (23) and is limited by an annular boss disposed on the inner circumferential surface of the connecting cap (22), and the other end of the connecting cap (22) is screwed with the lock ring support sleeve (19) of the self-locking mechanism and is adjusted and fixed by the adjusting pin (20).

11. The downhole choke according to claim 1, characterized in that the center tube (11) is a drift diameter-like structure, a first sealing groove (111) for installing a sealing ring (6), an external thread and a sealing surface matched with the connecting and delivering mechanism are arranged on the outer circumferential surface of one end of the center tube (11), an external thread matched with the seat seal self-locking mechanism and a second sealing groove (112) for installing the sealing ring (6) are respectively arranged on the outer circumferential surface and the inner circumferential surface of the other end of the center tube (11), and an outer convex ring (113) and a third sealing groove (114) arranged on the outer convex ring (113) and used for installing the sealing ring (6) are arranged on the outer circumferential surface of the middle part of the center tube (11) and close to one end of the second sealing groove (112).