CN212479182U - Coupling type underground throttling device capable of automatically adjusting opening of air tap - Google Patents

Abstract

The utility model relates to an automatic adjustment air cock open-ended connects hoop formula throttling arrangement in pit, including connecting delivery mechanism, salvaging deblocking mechanism, card work sealing mechanism, setting self-locking mechanism, filtering throttle mechanism and center tube, it sets up to connect delivery mechanism the top of center tube, it sets up to salvage deblocking mechanism the upper segment of center tube, card work sealing mechanism suit is in the trusteeship. A automatic adjustment air cock open-ended connects hoop formula throttling arrangement in pit can not take place to sting the phenomenon of dying oil pipe, also need not go into in advance and preset the working barrel down, rely on the locking piece to stretch into oil pipe connector hoop groove clearance card, the impact force extrusion packing element that pounces and lift down when putting in is out warp sealedly, the locking piece is released the card from oil pipe coupling groove clearance shrink during salvage, the packing element contracts the deblocking of contracting, the restriction when having realized the downhole pressure great, increase large-traffic function when the downhole pressure is less, it is smooth to have the well of going down, it is convenient to sit the seal, it is sealed reliable, need not to change the air cock, the advantage of being convenient for salvage.

Description

Coupling type underground throttling device capable of automatically adjusting opening of air tap

Technical Field

The utility model relates to a natural gas throttle pressure reduction equipment technical field in the pit especially relates to an automatic adjust air cock open-ended connects hoop formula throttling arrangement in the pit.

Background

With the increase of high-pressure and high-yield oil and gas wells, the gas field generally adopts a pressure regulating valve to carry out multistage pressure reduction and heat preservation production on the ground, and the ground throttling and the formation of hydrates bring many difficulties to the production and management of the gas wells. For example, the wellhead and part of the surface pipeline before throttling can still bear high pressure; switching the pressure regulating valve can produce harmful excitement to gas well production; the temperature is reduced due to ground throttling and pressure reduction, a lot of natural gas resources are wasted due to ground heat preservation and heating, and corresponding managers need to be equipped; gas well fluid carrying capacity is relatively low; the hydrate generated by throttling and cooling can cause damage such as blockage to an oil pipe, a metering orifice plate and a ground pipeline and reduction of heat conduction of equipment, so that the production of a gas well is seriously influenced, and even the safety of people and equipment can be endangered. The application of the downhole throttling technology can solve the series of problems.

The downhole throttling process technology is a process technology for enabling the throttling depressurization process of natural gas to occur in a shaft of a gas well through a downhole throttling device. The gas well downhole choke is a downhole tool which is arranged in a shaft and realizes the gas well downhole throttling technology by means of anchoring mechanism positioning, rubber cylinder sealing and air nozzle production allocation.

In the early forty years of the last century, mulaviv and krylov proposed the use of bottom hole choke in a flowing well, but they have not gained widespread use, and have not attracted the attention of mining again until the eighties of the twentieth century. In China, the underground throttling process technology has been successfully used in a plurality of gas fields such as Sichuan, Changqing, Jilin, Liaohe, Qinghai, China Central plains, Xinjiang, North China, Daqing and Shengli, and research and innovation on the underground throttleer of the gas well are rapidly followed.

The underground throttleers in the current market are generally distinguished in a setting mode and comprise slip type underground throttleers and preset underground throttleers. The slip type underground throttleer is widely applied to various oil fields nowadays, and large-area popularization and application show that slips are adhered to pipe walls under high-temperature and high-pressure environments in long-term underground work, and resistance is very high during releasing the slips, so that the slips are difficult to salvage. The preset underground choke is easy to salvage, but a working barrel needs to be connected to a production pipe column, so that the construction organization is complex and the cost is high.

Therefore, the hoop-connecting type underground throttling device capable of automatically adjusting the opening of the air nozzle is designed to solve the problems.

Disclosure of Invention

The utility model provides a collar-type downhole throttling device capable of automatically adjusting the opening of an air tap, which is characterized in that the collar-type downhole throttling device is connected and matched with an oil pipe collar through a locking block to realize positioning, and comprises a connecting and delivering mechanism, a salvaging and deblocking mechanism, a clamping and sealing mechanism, a seat sealing self-locking mechanism, a filtering and throttling mechanism and a central pipe, wherein the central pipe is provided with a first sealing groove, a second sealing groove and a third sealing groove;

the connecting and delivering mechanism is arranged at the top end of the central pipe and comprises a releasing joint, a shearing pin and a lifting pipe, the releasing joint consists of a first connecting body, an outer convex ring and a second joint body, the first connecting body and the outer convex ring are used for connecting a steel wire lowering tool string, the lifting and hanging tube consists of an inner hole upper section, an inner hole middle section and an inner hole lower section, the releasing joint is sleeved on the lifting and hanging tube, the lower end of the outer circumferential surface of the second connector body is in contact fit with the upper section of the inner hole, the second connector body is fixedly connected with the upper section of the inner hole through the shearing pin, the inner wall of the middle section of the inner hole is provided with a necking limit table, the inner wall of the lower section of the inner hole is provided with an internal thread used for being connected with the end part of the central tube and a sealing surface attached to the side wall of the central tube;

the salvaging and deblocking mechanism is arranged at the upper section of the central pipe, the salvaging and deblocking mechanism comprises a sleeve, a hanging cap, a claw support, a lifting hanging ring, a deblocking shear pin, a locking ball and a supporting pipe, the sleeve is sleeved on the central pipe and is in threaded connection with the inner circumferential surface of the lifting hanging ring, a shear pin annular groove is formed in the outer circumferential surface of the lifting hanging ring, the deblocking shear pin is arranged on the side wall of the claw support and is matched with the shear pin annular groove, the supporting pipe is sleeved with the sleeve, an annular boss used for receiving impact is arranged at one end of the sleeve, a necking section is arranged at the other end of the sleeve and is matched with an internal thread of the lifting hanging ring, a cylindrical polished surface is arranged on the side wall of the middle part of the sleeve, the supporting pipe is composed of a supporting pipe expanding section, a radial through hole, a supporting pipe body and a first sawtooth unidirectional lock catch, the supporting pipe expanding section is abutted to the necking section, the first unidirectional lock catch sawtooth is arranged at the The supporting tube can only enter and can not exit, the hanging cap is of an annular structure, the inner peripheral surface of the hanging cap is a drift diameter, the outer peripheral surface of the hanging cap is provided with an external thread and a limiting boss which are matched with the jaw support, the jaw support with the outer peripheral surface in an equal-diameter tubular structure comprises a first inner diameter part, a second inner diameter part and a third inner diameter part which are communicated, the side wall of the first inner diameter part is provided with an internal thread used for being connected with the hanging cap, the side wall of the second inner diameter part is uniformly distributed with radial shear pin threaded holes used for installing the deblocking shear pins, an annular lock ball groove for accommodating the lock ball is arranged between the second inner diameter part and the third inner diameter part, the bottom of the claw support is provided with a first claw groove which is provided with an annular chute, the locking ball is fixed in an annular space formed by the annular locking ball groove and the radial through hole and is limited at the necking section;

the clamping and sealing mechanism is sleeved on the supporting tube and comprises a clamping jaw made of nickel-titanium alloy, a locking piece supporting tube, a locking piece, a transition tube and a rubber tube, the locking piece supporting tube is sleeved on the supporting tube and consists of a first connecting part, a clamping jaw body and a second connecting part, the locking piece supporting tube consists of a first axial fixing end, a locking piece sliding groove, a locking piece fixing part, a second clamping jaw groove and a second axial fixing end, the first connecting part is fixed in the first clamping jaw groove, the second connecting part is located in the second clamping jaw groove, the clamping jaw body is arc-shaped in the outer diameter direction and enters the locking piece fixing part after being deformed under pressure, the locking piece is in sliding connection with the locking piece supporting tube, the locking piece consists of a T-shaped bulge and a locking piece body, and the T-shaped bulge is in limited sliding connection with the locking piece sliding groove, the locking block body is connected with the locking block fixing part in a sliding mode, the transition pipe is sleeved on the supporting pipe, and the upper end face of the transition pipe is in contact fit with the second axial fixing end;

the seat seal self-locking mechanism is sleeved at the lower end of the supporting tube and comprises a rubber cylinder support, a locking ring support and a locking ring, the rubber cylinder support is of a tubular structure and is sleeved on the supporting tube, the rubber cylinder support comprises a first support sleeve section, a second support sleeve section and a third support sleeve section which are connected, the locking ring support and the locking ring are sequentially sleeved on the inner circumferential surface of the first support sleeve section, the second support sleeve section and the central tube are arranged at intervals to form a space for accommodating the supporting tube, an external thread and a first pin stabilizing hole which are matched with the filtering throttling mechanism are arranged on the outer circumferential surface of the third support sleeve section, and the third support sleeve section is matched with the inner circumferential surface of the end part of the central tube; the lock ring is of an annular structure, is sleeved at the end part of the support tube and is in limit fit with the support tube, and comprises a lock ring body, an outer conical surface matched with the lock ring support is arranged on the outer peripheral surface of the end part of the lock ring body, a second one-way sawtooth lock catch matched with the first one-way sawtooth lock catch is arranged on the inner peripheral surface of the end part of the lock ring body, and an opening is arranged along one bus of the lock ring to enable the lock ring to have circumferential elasticity;

the filtering throttling mechanism is sleeved at the lower end of the central pipe and comprises an adjusting stable pin, an air faucet, a connecting cap and a filter screen cover, the air faucet consists of an air faucet body, a baffle, a limiting block, a first connecting rod, a second connecting rod, a third connecting rod and a pressure-bearing film, the second connecting rod and the pressure-bearing film are hinged to the air faucet body, the limiting block is sleeved with the first connecting rod to achieve limiting and sealing effects, the baffle, the first connecting rod, the second connecting rod, the third connecting rod and the pressure-bearing film are connected through pins, sliding grooves are formed in two ends of the second connecting rod, the pressure-bearing film is made of nickel-titanium alloy and preformed into an inward bent shape, so that the pressure-bearing film is bent outwards when underground air pressure is high and is restored into the inward bent shape when the underground air pressure is low; the connecting cap is of a circular ring-shaped structure and comprises a first connecting part and a second connecting part which are connected, the inner peripheral surface of the first connecting part is provided with an internal thread matched with the end part of the rubber cylinder support of the seat seal self-locking mechanism, the side wall of the first connecting part is provided with a second pin stabilizing hole for mounting the adjusting pin, the inner circumferential surface of the second connecting part is smaller than the inner circumferential surface of the first connecting part, the end part of the filter screen cover is sleeved in the first connecting part and is clamped with the second connecting part, the filter screen cover is sleeved on the peripheral surface of the end part of the central tube and supports the end part of the air tap so as to limit the air tap, one end of the connecting cap is sleeved on the outer peripheral surface of the filter screen cover and is limited by an annular boss arranged on the inner peripheral surface of the connecting cap, the other end of the connecting cap is connected with a rubber cylinder support screw thread of the self-locking mechanism and is adjusted and fixed through the adjusting stabilizing pin.

Further, in order to improve the sealing performance, it is preferable that the rubber sleeve is M-shaped, so that the rubber sleeve can increase the contact area with the oil pipe after being pressed.

Preferably, a sealing surface is arranged on the inner wall of one end, away from the diameter-expanding section of the supporting tube, of the supporting tube body.

Preferably, sealing rubber rings are arranged in the first sealing groove, the second sealing groove and the third sealing groove.

Preferably, the outer diameter of the locking block is smaller than the inner diameter of the oil pipe in a natural state, and the upper part of the locking block is provided with a chamfer.

Preferably, the rubber cylinder and the limiting block are made of rubber.

The utility model has the advantages that:

the utility model discloses an automatic adjustment air cock open-ended connects hoop formula throttle device in pit combines preset choke ware easily to salvage and slip formula choke ware seat to seal the advantage that the position is nimble, make full use of nickel titanium alloy's hyperelasticity and shape memory characteristic, consider that the oil pipe collar is as an oil field drilling tool who is used for connecting oil pipe, it adopts the slips direct contact oil pipe inner wall to accomplish the card to be different from slip formula choke ware, but utilize the jack catch pressurized deformation to get into the locking piece sleeve and promote the locking piece, make it fix a position in oil pipe connector hoop groove clearance and realize the card, neither can take place the phenomenon that slip formula slips seized oil pipe, also need not go into in advance to set the working barrel in advance; the air faucet of the connecting hoop type underground throttling device capable of automatically adjusting the opening of the air faucet controls the size of the air faucet through the deformation of the pressure-bearing film, so that the functions of limiting the flow when the underground pressure is larger and increasing the flow when the underground pressure is smaller are realized, and the connecting hoop type underground throttling device has the advantages of being smooth in descending, convenient to seat and seal, reliable in sealing, free of replacing the air faucet and convenient to salvage.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic structural view of the connection delivery mechanism of the present invention;

FIG. 3 is a schematic structural view of the fishing and unsealing mechanism of the present invention;

fig. 4 is a schematic structural view of the locking sealing mechanism of the present invention;

fig. 5 is a schematic structural view of the seat seal self-locking mechanism and the filtering throttling mechanism of the present invention;

FIG. 6 is a schematic structural view of the releasing sub of the present invention;

fig. 7 is a schematic structural diagram of the sleeve according to the present invention;

FIG. 8 is a schematic structural view of the center tube of the present invention;

fig. 9 is a schematic structural view of the support tube of the present invention;

fig. 10 is a schematic structural view of the claw holder of the present invention;

fig. 11 is a schematic structural view of the jaw of the present invention;

fig. 12 is a schematic structural view of the lock block of the present invention;

fig. 13 is a schematic structural view of the lock block support tube of the present invention;

fig. 14 is a schematic structural view of the rubber cartridge holder of the present invention;

fig. 15 is a schematic structural view of the locking ring of the present invention;

FIG. 16 is a schematic view of the throttle body according to the present invention when the operating air pressure is low;

fig. 17 is a schematic structural view of the throttle valve according to the present invention when the working air pressure is high;

fig. 18 is a schematic structural view of the connecting cap of the present invention;

fig. 19 is a schematic structural view of the present invention in a seated state;

fig. 20 is a schematic view of the structure of the present invention in an unsealed state;

wherein: 1-releasing the joint; 101-a first connector body; 102-an outwardly convex circular ring; 103-a second connector body;

2-shearing the pin;

3, lifting and hanging the pipe; 301-upper section of inner bore; 302-middle section of inner hole; 303-lower section of inner hole;

4-sleeve, 401-annular boss; 402-cylindrical smooth surface; 403-a necking section;

5, hanging a cap;

6-claw support; 601-a first inner diameter portion; 602-a second inner diameter portion; 603 radial shear pin threaded holes; 604-annular ball-locking grooves; 605-a third inner diameter portion; 606-a first jaw groove;

7-lifting a hanging ring;

8-unsealing the shear pins;

9-locking the ball;

10-hosting; 1001-hosting diameter expansion section; 1002-radial through holes; 1003-hosting body; 1004 — a first unidirectional serration catch;

11-a jaw; 1101 — a first connection; 1102-a jaw body; 1103 — a second connection;

12-lock block hosting; 1201-a first axially fixed end; 1202-a lock block sliding groove; 1203-locking piece fixing part; 1204-a second jaw groove; 1205-a second axial fixed end;

13-locking block; 1301-T shaped bulges; 1302-a lock block body;

14-a transition duct;

15-a central tube; 1501-a first seal groove; 1502-a second seal groove; 1503-a third sealing groove;

16-a rubber cylinder;

17-rubber cylinder supporting pipe; 1701-a first holster segment; 1702-a second holster segment; 1703-a third holster segment; 1704-a first stabilizer hole;

18-a locking ring;

19-a lock ring holder; 1901-locking ring body; 1902-an external conical surface; 1903-second unidirectional serration locking;

20-adjusting a stable pin;

21-air tap; 2101-air tap body; 2102-baffle; 2103-a limiting block; 2104-first connecting rod; 2105-a second connecting rod; 2106-a third connecting rod; 2107-a pressure-bearing film;

22-a connecting cap; 2201-a first connection segment; 2202-a second connection segment; 2203-second dowel hole;

23-strainer cover.

Detailed Description

The following detailed description will be made in conjunction with embodiments of the present invention with reference to the accompanying drawings.

A hoop-type underground throttling device capable of automatically adjusting an opening of an air tap comprises a connecting and delivering mechanism, a fishing and unsealing mechanism, a clamping and sealing mechanism, a seat seal self-locking mechanism, a filtering throttling mechanism and a central pipe 15, wherein as shown in figures 1 and 8, a first seal groove 1501, a second seal groove 1502 and a third seal groove 1503 are formed in the central pipe 15;

as shown in fig. 1 and 2, the connection and delivery mechanism is disposed at the top end of the central tube 15, the connection and delivery mechanism includes a releasing joint 1, a shearing pin 2 and a hanging tube 3, as shown in fig. 6, the releasing joint 1 is composed of a first connector 101, an outer convex ring 102 and a second connector 103, the first connector 101 and the outer convex ring 102 are used for connecting a steel wire lowering tool string, the hanging tube is composed of an inner hole upper section 301, an inner hole middle section 302 and an inner hole lower section 303, the releasing joint 1 is sleeved on the hanging tube 3, the lower end of the outer circumferential surface of the second connector 103 is in contact fit with the inner hole upper section 301, the second connector 103 and the inner hole upper section 301 are fixedly connected through the shearing pin 2, a necking limit table is disposed on the inner wall of the inner hole middle section 302, an inner thread for connecting with the end of the central tube 15 and a lower section of the central tube 15 are disposed on the inner wall of the inner hole 303 A sealing surface with side walls attached to each other;

as shown in fig. 1, 3, 7, 9 and 10, the fishing deblocking mechanism is disposed at the upper section of the central tube 15, the fishing deblocking mechanism includes a sleeve 4, a hanging cap 5, a claw support 6, a hanging ring 7, a deblocking shear pin 8, a locking ball 9 and a supporting tube 10, the sleeve 4 is sleeved on the central tube 15 and is in threaded connection with the inner circumferential surface of the hanging ring 7, a shear pin ring groove is disposed on the outer circumferential surface of the hanging ring 7, the deblocking shear pin 8 is disposed on the side wall of the claw support 6 and is matched with the shear pin ring groove, the supporting tube 10 is sleeved with the sleeve 4, one end of the sleeve 4 is provided with an annular boss 401 for receiving impact, the other end of the sleeve 4 is provided with an internal thread of a necking section 403 matched with the hanging ring 7, a cylindrical smooth surface 402 is disposed on the side wall of the middle part of the sleeve 4, the supporting tube 10 is composed of a supporting tube section 1001, an expanding section 1001, The pipe supporting device comprises a radial through hole 1002, a pipe supporting body 1003 and a first unidirectional sawtooth lock catch 1004, wherein a pipe supporting expanding section 1001 is abutted to the neck contracting section 403, the first unidirectional sawtooth lock catch 1004 is arranged at the lower end of the pipe supporting body 1003 and matched with the seat seal self-locking mechanism to enable the pipe supporting 10 to only enter and not exit, the hanging cap 5 is of an annular structure, the inner peripheral surface of the hanging cap 5 is of a through diameter, an external thread and a limiting boss which are matched with the claw support 6 are arranged on the outer peripheral surface of the hanging cap 5, the claw support 6 with the outer peripheral surface of an equal-diameter tubular structure comprises a first inner diameter part 601, a second inner diameter part 602 and a third inner diameter part 605 which are communicated, an internal thread used for being connected with the hanging cap 5 is arranged on the side wall of the first inner diameter part 601, and radial shear pin thread holes 603 used for installing the deblocking shear pins 8 are uniformly distributed on, an annular lock ball groove 604 for accommodating the lock ball 9 is arranged between the second inner diameter part 602 and the third inner diameter part 605, a first jaw groove 606 is arranged at the bottom of the jaw support 6, an annular chute is arranged in the first jaw groove 606, and the lock ball 9 is fixed in an annular space formed by the annular lock ball groove 604 and the radial through hole 1002 and is limited at the neck-reducing section 403;

as shown in fig. 1, 4, 11, 12, the locking sealing mechanism is sleeved on the supporting tube 10, the locking sealing mechanism includes a claw 11 made of nitinol, a locking piece supporting tube 12, a locking piece 13, a transition tube 14 and a rubber tube 16, the locking piece supporting tube 12 is sleeved on the supporting tube 10, the claw 11 is composed of a first connecting portion 1101, a claw body 1102 and a second connecting portion 1103, the locking piece supporting tube 12 is composed of a first axial fixing end 1201, a locking piece sliding groove 1202, a locking piece fixing portion 1203, a second claw groove 1204 and a second axial fixing end 1205, the first connecting portion 1101 is fixed on the first claw groove 606, the second connecting portion 1103 is seated on the second claw groove 1204, the claw body 1102 is arc-shaped in an outer diameter direction and the claw body 1102 enters the locking piece fixing portion 1203 after being deformed by pressure, the locking piece 13 is slidably connected with the locking piece supporting tube 12, the locking block 13 is composed of a T-shaped protrusion 1301 and a locking block body 1302, the T-shaped protrusion 1301 is in limit sliding connection with the locking block sliding groove 1202, the locking block body 1302 is in sliding connection with the locking block fixing part 1203, the transition pipe 14 is sleeved on the supporting pipe 10, and the upper end surface of the transition pipe 14 is in contact fit with the second axial fixing end 1205;

as shown in fig. 1 and 5, the setting self-locking mechanism is sleeved at the lower end of the supporting tube 10, the setting self-locking mechanism includes a rubber cylinder holder 17, a locking ring holder 18 and a locking ring 19, the rubber cylinder holder 17 is of a tubular structure and is sleeved on the supporting tube 10, the rubber cylinder holder 17 includes a first holder sleeve section 1701, a second holder sleeve section 1702 and a third holder sleeve section 1703 which are connected, the locking ring holder 18 and the locking ring 19 are sequentially sleeved on the inner circumferential surface of the first holder sleeve section 1701, the second holder sleeve section 1702 and the central tube 15 are arranged at intervals to form a space for accommodating the supporting tube 10, an external thread and a first pin hole 1704 which are matched with the filter throttling mechanism are arranged on the outer circumferential surface of the third holder sleeve section 1703, and the third holder sleeve section 1703 is matched with the inner circumferential surface of the end of the central tube 15; the lock ring 19 is of an annular structure, the lock ring 19 is sleeved at the end of the support tube 10 and is in limit fit with the support tube 10, the lock ring 19 comprises a lock ring body 1901, an outer conical surface 1902 matched with the lock ring support 18 is arranged on the outer peripheral surface of the end of the lock ring body 1901, a second unidirectional sawtooth lock catch 1903 matched with the first unidirectional sawtooth lock catch 1004 is arranged on the inner peripheral surface of the end of the lock ring body 1901, and an opening is arranged along one generatrix of the lock ring 19 so that the lock ring 19 has circumferential elasticity;

the filtering throttling mechanism is sleeved at the lower end of a central tube 15 and comprises an adjusting stabilizing pin 20, an air tap 21, a connecting cap 22 and a filtering screen cover 23, the connecting cap 22 is of a circular ring-shaped structure, the connecting cap 22 comprises a first connecting portion 1101 and a second connecting portion 1103 which are connected, an inner circumferential surface of the first connecting portion 1101 is provided with an inner thread matched with the end portion of a rubber cylinder support 17 of the seat seal self-locking mechanism, a side wall of the first connecting portion 1101 is provided with a second stabilizing pin hole 2203 used for installing the adjusting stabilizing pin 20, an inner circumferential surface of the second connecting portion 1103 is smaller than an inner circumferential surface of the first connecting portion 1101, an end portion of the filtering screen cover 23 is sleeved in the first connecting portion 2201 and clamped with the second connecting portion 1103, the filtering screen cover 23 is sleeved on an outer circumferential surface of the end portion of the central tube 15 and supports an end portion of the air tap 21 so as to limit the, 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 arranged on the inner peripheral surface of the connecting cap 22, and the other end of the connecting cap 22 is in threaded connection with the rubber cylinder support 17 of the self-locking mechanism and is adjusted and fixed by the adjusting and stabilizing pin 20;

the air tap 21 comprises an air tap body 2101, a baffle 2102, a limit block 2103, a first connecting rod 2104, a second connecting rod 2105, a third connecting rod 2106 and a pressure-bearing film 2107, wherein the second connecting rod 2105 and the pressure-bearing film 2107 are hinged to the air tap body 2101, the limit block 2103 is sleeved with the first connecting rod 2104 to achieve limiting and sealing effects, the baffle 2102, the first connecting rod 2104, the second connecting rod 2105, the third connecting rod 2106 and the pressure-bearing film 2107 are connected through pins, sliding grooves are formed in two ends of the second connecting rod 2105, the pressure-bearing film 2107 is made of nickel-titanium alloy and preformed into an inward bending shape, so that the pressure-bearing film is bent outwards when underground air pressure is high and is restored into an inward bending shape when underground air pressure is low;

as shown in fig. 16, under the condition of small air pressure, after the restrictor of the present application is put into a well, the air pressure in the well is sufficient, because the pressure-bearing film 2107 is preset to be in an inward curved shape, the pressure-bearing film 2107 is pressed and deformed into an outward curved shape, so as to push the third connecting rod 2106 to move, and drive the connecting pin to move in the sliding groove, and finally abut against one end in the groove, so that the second connecting rod 2105 rotates clockwise, and drives the first connecting rod 2104, the limiting block 2103 and the baffle 2102 to move inward, until the limiting block 2103 moves to the limiting groove of the air nozzle body 2101 and then stops moving, the radial size of the air vent hole 21 of the air nozzle is reduced, so as to play a role of limiting the flow, at this time, the overall structure of the air nozzle 21 is as shown in fig. 17, after the operation of the restrictor of the present application is performed for a long time, the air pressure in the well is significantly reduced, and, due to the shape memory characteristic of nickel-titanium alloy, the pressure-bearing film 2107 is restored to be in an inward bending shape, the third connecting rod 2106 is pulled to move inwards, the connecting pin is driven to move in the sliding groove and finally abuts against the other end in the groove, the second connecting rod 2105 is driven to rotate anticlockwise to drive the first connecting rod 2104, the limiting block 2103 and the baffle 2102 to move outwards, the limiting block 2103 is separated from the limiting groove, the radial size of the vent hole of the air nozzle 21 is increased, the requirement of mining flow can be met after the pressure of the gas well is reduced, and the air nozzle does not need to be replaced manually.

Further, in order to improve the sealing performance, it is preferable that the rubber sleeve 16 is formed in an M shape, so that the rubber sleeve 16 can increase a contact area with the oil pipe after being pressed.

Preferably, a sealing surface is arranged on the inner wall of the trusteeship body 1003 at one end far away from the trusteeship expanding section 1001.

Preferably, a sealing rubber ring is installed in each of the first sealing groove 1501, the second sealing groove 1502, and the third sealing groove 1503.

Preferably, the outer diameter of the locking block 13 is smaller than the inner diameter of the oil pipe in a natural state, and a chamfer is arranged at the upper part of the locking block 13.

Preferably, the rubber tube 16 and the limit block 2103 are made of rubber.

The using method comprises the following steps:

the hoop-type underground throttling device capable of automatically adjusting the opening of the air tap completes throwing, clamping, setting and fishing through steel wire operation;

putting:

the releasing joint 1 is connected in series by a steel wire tool and is put into the well at a normal speed of less than or equal to 60m/min, the hoop type underground throttling device capable of automatically adjusting the opening of the air tap does not need to be attached to the side wall of an oil pipe in the normal putting-in process, the device can be put into the well freely without blocking and setting in the midway, the device is accelerated and put down when reaching a certain height away from a preset position, and the releasing speed is up to 250 +/-m/min, and the releasing is finished by emergency braking;

locking:

the hoop-type underground throttling device capable of automatically adjusting the opening of the air tap is in emergency rest in the throwing process, a jar at the upper part of the steel wire working string impacts on an annular boss 401 of the sleeve 4 under the action of downward inertia force, the sleeve 4 is impacted to move downward to push the support tube 10, the jaw support 6 and the hanging cap 5 to move downward together under the action of the hanging ring 7 and the locking ball 9, so that the jaw 11 moves downward and extrudes the jaw body 1102 to bend outward, the locking block 13 is pushed to move to slide in the locking block support tube 12, the outer diameter of the locking block 13 is larger than the inner diameter of an oil pipe at the moment, the locking block 13 is embedded into a gap of a collar groove of the oil pipe, and the whole tool is blocked by the oil pipe groove, so that the clamping of the hoop-type underground throttling device is completed;

setting:

the transition pipe 14 moves down under the action of the lock block host pipe 12, causing the packing rubber 16 to axially compress and radially expand to seal the annulus of the host pipe 10 and tubing, because the setting self-locking mechanism consisting of the rubber cylinder support 17, the locking ring support 18 and the locking ring 19 enables the supporting tube 10 to be inserted into the rubber cylinder support 17, and can only enter and can not exit under the action of the first one-way sawtooth lock 1004 and the second one-way sawtooth lock 1903 to realize self-locking, then the releasing sub 1 is lifted up to drive the central tube 15 to move upwards, the sealing rubber tube 16 is continuously compressed through the rubber tube support 17, so that the sealing capability is stronger and stronger, under the condition that the pulling force reaches the optimal value of designed setting, the shearing pin 2 is sheared, so that the coupling type underground throttling device capable of automatically adjusting the opening of the air tap realizes releasing and setting;

fishing:

closing the well, after the pressure balance of the lower part and the upper part of the coupling type downhole throttling device with an automatically adjusted air tap opening, descending a fisher to a proper height away from the coupling type downhole throttling device at a normal speed, quickly descending the fisher to impact and grasp the annular boss 401 at the upper end of the casing 4, lifting a steel wire to start the jar and shear the deblocking shear pin 8, continuously lifting the steel wire to enable the casing 4 to ascend to enable the lifting ring 7 to ascend and hang the hanging cap 5, enabling the lower end of the casing 4 to be separated from the inner circle at the upper end of the supporting tube 10 to enable the shaft surface of the locking ball 9 to form an annular space so as to lose the locking effect, continuously lifting the casing 4 to enable the lifting ring 7 to drag the hanging cap 5 and the claw support 6 to ascend, enabling the claw support 6 to drag the claw 11 to be separated from the fixing part of the locking block 1203, and enabling the locking block 13 to be separated from a tubing coupling groove in the ascending operation, forming a space for restoring the sealing rubber sleeve 16, so as to completely unlock and unseal the slips 13 and the sealing rubber sleeve 15, that is, the downhole choke is unsealed, and finally the neck section 403 of the casing 4 is hung on the inner hole lower section 303 of the hanging pipe 3, so that the hanging pipe 3 drags the whole collar type downhole choke device capable of automatically adjusting the opening of the air tap through the central pipe 15 to lift out the well mouth, and the fishing is successful.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (6)

1. A hoop-connecting type underground throttling device capable of automatically adjusting an air tap opening comprises a connecting and delivering mechanism, a fishing and deblocking mechanism, a clamping and sealing mechanism, a seat seal self-locking mechanism, a filtering throttling mechanism and a central pipe (15), and is characterized in that a first sealing groove (1501), a second sealing groove (1502) and a third sealing groove (1503) are formed in the central pipe (15);

the connection and delivery mechanism is arranged at the top end of the central pipe (15), the connection and delivery mechanism comprises a releasing joint (1), a shearing pin (2) and a lifting pipe (3), the releasing joint (1) consists of a first connecting body (101), an outer convex ring (102) and a second joint body (103), the first connecting body (101) and the outer convex ring (102) are used for connecting a steel wire lowering tool string, the lifting pipe consists of an inner hole upper section (301), an inner hole middle section (302) and an inner hole lower section (303), the releasing joint (1) is sleeved on the lifting pipe (3), the lower end of the outer circumferential surface of the second joint body (103) is in contact fit with the inner hole upper section (301), the second joint body (103) and the inner hole upper section (301) are fixedly connected through the shearing pin (2), and a necking limit table is arranged on the inner wall of the inner hole middle section (302), the inner wall of the inner hole lower section (303) is provided with an internal thread used for being connected with the end part of the central tube (15) and a sealing surface attached to the side wall of the central tube (15);

the fishing and deblocking mechanism is arranged at the upper section of the central pipe (15), the fishing and deblocking mechanism comprises a sleeve (4), a hanging cap (5), a jaw support (6), a lifting hanging ring (7), a deblocking shear pin (8), a locking ball (9) and a supporting pipe (10), the sleeve (4) is sleeved on the central pipe (15) and is in threaded connection with the inner circumferential surface of the lifting hanging ring (7), a shear pin ring groove is formed in the outer circumferential surface of the lifting hanging ring (7), the deblocking shear pin (8) is arranged on the side wall of the jaw support (6) and is matched with the shear pin ring groove, the supporting pipe (10) is sleeved with the sleeve (4), an annular boss (401) used for receiving impact is arranged at one end of the sleeve (4), a necking section (403) is arranged at the other end of the sleeve (4) and is matched with an inner thread of the lifting hanging ring (7), a cylindrical smooth surface (402) is arranged on the side wall of the middle part of the sleeve (4), the supporting tube (10) is composed of a supporting tube diameter-expanding section (1001), a radial through hole (1002), a supporting tube body (1003) and a first one-way sawtooth lock catch (1004), the supporting tube diameter-expanding section (1001) abuts against the neck-contracting section (403), the first one-way sawtooth lock catch (1004) is arranged at the lower end of the supporting tube body (1003) and is matched with the seat seal self-locking mechanism to enable the supporting tube (10) to enter and not exit, the hanging cap (5) is of an annular structure, the inner peripheral surface of the hanging cap (5) is of a through diameter, an external thread and a limiting boss which are matched with the claw support (6) are arranged on the outer peripheral surface of the hanging cap (5), the claw support (6) with the outer peripheral surface of an equal-diameter tubular structure comprises a first inner diameter part (601), a second inner diameter part (602) and a third inner diameter part (605) which are communicated, and an internal thread which is used for being connected with the hanging cap (, radial shear pin threaded holes (603) for mounting the deblocking shear pins (8) are uniformly distributed in the side wall of the second inner diameter portion (602), an annular lock ball groove (604) for accommodating the lock ball (9) is formed between the second inner diameter portion (602) and the third inner diameter portion (605), a first jaw groove (606) is formed in the bottom of the jaw support (6), an annular chute is formed in the first jaw groove (606), and the lock ball (9) is fixed in an annular space formed by the annular lock ball groove (604) and the radial through hole (1002) and is limited at the neck shrinking section (403);

the clamping and sealing mechanism is sleeved on the supporting tube (10) and comprises a clamping jaw (11) made of nickel-titanium alloy, a locking block supporting tube (12), a locking block (13), a transition tube (14) and a rubber cylinder (16), the locking block supporting tube (12) is sleeved on the supporting tube (10), the clamping jaw (11) consists of a first connecting part (1101), a clamping jaw body (1102) and a second connecting part (1103), the locking block supporting tube (12) consists of a first axial fixing end (1201), a locking block sliding groove (1202), a locking block fixing part (1203), a second clamping jaw groove (1204) and a second axial fixing end (1205), the first connecting part (1101) is fixed on the first clamping jaw groove (606), the second connecting part (1103) is located in the second clamping jaw groove (1204), the clamping jaw body (1102) is arc-shaped in the radial direction, and the clamping jaw body (1203) enters the locking block fixing part (1203) after being deformed, the locking block (13) is in sliding connection with the locking block supporting tube (12), the locking block (13) is composed of a T-shaped protrusion (1301) and a locking block body (1302), the T-shaped protrusion (1301) is in limiting sliding connection with the locking block sliding groove (1202), the locking block body (1302) is in sliding connection with the locking block fixing part (1203), the transition tube (14) is sleeved on the supporting tube (10), and the upper end face of the transition tube (14) is in contact fit with the second axial fixing end (1205);

the seat seal self-locking mechanism is sleeved at the lower end of the supporting tube (10), the seat seal self-locking mechanism comprises a rubber cylinder support (17), a locking ring support (18) and a locking ring (19), the rubber cylinder support (17) is of a tubular structure and is sleeved on the support pipe (10), the rubber cylinder support (17) comprises a first support sleeve section (1701), a second support sleeve section (1702) and a third support sleeve section (1703) which are connected, the locking ring support (18) and the locking ring (19) are sequentially sleeved on the inner circumferential surface of the first support sleeve section (1701), the second saddle section (1702) being spaced from the center tube (15) to form a space for receiving the seat tube (10), the outer peripheral surface of the third sleeve supporting section (1703) is provided with an external thread matched with the filtering throttling mechanism and a first pin stabilizing hole (1704), the third sleeve supporting section (1703) is matched with the inner peripheral surface of the end part of the central pipe (15); the lock ring (19) is of an annular structure, the lock ring (19) is sleeved at the end of the support pipe (10) and is in limit fit with the support pipe (10), the lock ring (19) comprises a lock ring body (1901), an outer conical surface (1902) matched with the lock ring support (18) is arranged on the outer peripheral surface of the end of the lock ring body (1901), a second one-way sawtooth lock catch (1903) matched with the first one-way sawtooth lock catch (1004) is arranged on the inner peripheral surface of the end of the lock ring body (1901), and an opening is formed along one generatrix of the lock ring (19) so that the lock ring (19) has circumferential elasticity;

the filtering throttling mechanism is sleeved at the lower end of a central pipe (15), the filtering throttling mechanism comprises an adjusting stable pin (20), an air tap (21), a connecting cap (22) and a filter screen cover (23), the air tap (21) consists of an air tap body (2101), a baffle (2102), a limiting block (2103), a first connecting rod (2104), a second connecting rod (2105), a third connecting rod (2106) and a pressure-bearing film (2107), the second connecting rod (2105) and the pressure-bearing film (2107) are hinged to the air tap body (2101), the limiting block (2103) is sleeved with the first connecting rod (2104) to achieve limiting and sealing effects, the baffle (2102), the first connecting rod (2104), the second connecting rod (2105), the third connecting rod (2106) and the pressure-bearing film (2107) are connected through pins, sliding grooves are formed in two ends of the second connecting rod (2105), the pressure-bearing film (2107) is made of nickel-titanium alloy and is preformed into an inward bent shape; connecting cap (22) is the ring structure, connecting cap (22) including first connecting portion (1101) and second connecting portion (1103) that are connected, first connecting portion (1101) inner peripheral surface be equipped with the tip matched with internal thread of seat self-locking mechanism's packing element support (17), be equipped with on the lateral wall of first connecting portion (1101) and be used for the installation the second of adjusting surely round pin (20) is surely pinhole (2203), the inner peripheral surface of second connecting portion (1103) is less than the inner peripheral surface of first connecting portion (1101), the tip suit of filter screen cover (23) in first connecting portion (1101) and with second connecting portion (1103) joint, filter screen cover (23) suit on the outer peripheral face of center tube (15) tip and support the tip of air cock (21) thereby with air cock (21) are spacing, the one end suit of connecting cap (22) on the outer peripheral face of filter screen cover (23) and through setting up in what be connected The inner peripheral surface of the connecting cap (22) is limited by an annular boss, and the other end of the connecting cap (22) is in threaded connection with a rubber cylinder support (17) of the self-locking mechanism and is adjusted and fixed through the adjusting and stabilizing pin (20).

2. The coupling type downhole throttling device capable of automatically adjusting the opening of the air tap according to claim 1, wherein the rubber cylinder (16) is provided with an M shape.

3. The connecting hoop type downhole throttling device capable of automatically adjusting the opening of the air tap according to claim 2, wherein a sealing surface is arranged on the inner wall of the end, away from the diameter-expanded section (1001), of the supporting pipe body (1003).

4. The coupling type downhole throttling device capable of automatically adjusting the opening of the air tap as claimed in claim 1, wherein sealing rubber rings are mounted in the first sealing groove (1501), the second sealing groove (1502) and the third sealing groove (1503).

5. The collar type downhole throttling device for automatically adjusting the opening of the gas nozzle according to claim 3 or 4, wherein the outer diameter of the locking block (13) is smaller than the inner diameter of the oil pipe in a natural state, and the upper part of the locking block (13) is provided with a chamfer.

6. The collar-type downhole throttling device for automatically adjusting the opening of the air tap as claimed in claim 5, wherein the rubber cylinder (16) and the stop block (2103) are made of rubber.

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