阅读说明：本技术 开关井装置 (Well opening and closing device ) 是由 马辉运 熊杰 林生茂 叶长青 彭杨 陈家晓 李奎 陈珂 王威林 黄艳 孙风景 于 2018-06-04 设计创作，主要内容包括：本发明公开了一种开关井装置,属于采气工程领域。本发明通过装置本体上的第一接头将该开关井装置与油管固定连接,将第二接头与生产管线固定连接,将充气腔室的充气口通过调压机构和气源管线与油管和/或套管连接,并向充气腔室内充装气体。如果气井的生产通道处于开启状态,则油管内气体的压力逐渐减小,当油管内气体的压力小于充气腔室内气体的压力时,弹性机构的第二端向靠近阀座的方向运动,关闭气井的生产通道。之后,油管内气体的压力又逐渐增大,当油管内气体的压力大于充气腔室内气体的压力时,弹性机构的第二端向远离阀座的方向运动,开启气井的生产通道,从而实现了气井循环关闭或开启生产通道的生产模式,降低了气井生产的自动化要求。(The invention discloses a well opening and closing device, and belongs to the field of gas production engineering. The well opening and closing device is fixedly connected with an oil pipe through a first joint on the device body, a second joint is fixedly connected with a production pipeline, an inflation inlet of an inflation cavity is connected with the oil pipe and/or a sleeve through a pressure regulating mechanism and an air source pipeline, and air is filled into the inflation cavity. If the production channel of the gas well is in an open state, the pressure of the gas in the oil pipe is gradually reduced, and when the pressure of the gas in the oil pipe is smaller than the pressure of the gas in the inflation cavity, the second end of the elastic mechanism moves towards the direction close to the valve seat, so that the production channel of the gas well is closed. And then, the pressure of the gas in the oil pipe is gradually increased, and when the pressure of the gas in the oil pipe is greater than the pressure of the gas in the inflation cavity, the second end of the elastic mechanism moves towards the direction away from the valve seat to open the production channel of the gas well, so that the production mode that the gas well is closed or opened circularly is realized, and the automatic requirement of gas well production is lowered.)

1. A switchgear well device, characterized in that it comprises: the device comprises a device body (1), a valve seat (2), an elastic mechanism (3), an inflation chamber (4), a pressure regulating mechanism (5) and an air source pipeline (6);

The gas well production line connecting device is characterized in that the device body (1) is of a three-way structure, a first connector (11) of the device body (1) is used for being connected with a gas well oil pipe, a second connector (12) of the device body (1) is used for being connected with the gas well production line, the valve seat (2) is fixed in an inner cavity of the first connector (11) and is in sealing connection with the first connector (11), a through hole (21) is formed in the valve seat (2), and the center line of the through hole (21);

the one end at the gas outlet place of inflation cavity (4) with third joint (13) sealing connection, the inflation inlet of inflation cavity (4) passes through pressure regulating mechanism (5) with air supply pipeline (6) with the oil pipe and/or the bushing of gas well, inflation cavity (4) are used for filling gas, the first end of elastic mechanism (3) with the inner wall sealing connection of the gas outlet of inflation cavity (4), the second end of elastic mechanism (3) is located the inner chamber that third joint (13) just is used for the gas effect of filling in inflation cavity (4) is sealed down through-hole (21).

2. The switching well device according to claim 1, characterized in that it further comprises a limit catch (7);

The side of the second end of the elastic mechanism (3) is provided with a bulge (31), the first end of the limiting elastic claw (7) is fixedly connected with the end face of one end where the air outlet of the inflatable chamber (4) is located, the second end of the limiting elastic claw (7) is provided with a plurality of elastic resistance claws (71), and the elastic resistance claws (71) are clamped on the upper portion or the lower portion of the bulge (31).

3. The switch well device according to claim 1, characterized in that said elastic means (3) comprise a positioning member (32), a sliding rod (33), a plurality of springs (34) and a sealing member (35);

The first end of the positioning component (32) is fixedly connected with the inner wall of the air outlet of the inflatable chamber (4), the positioning component (32) is provided with a central through hole (36), and the central through hole (36) is communicated with the inflatable chamber (4);

Slide bar (33) are the step along the axial, the little one end of external diameter on slide bar (33) with the inner wall sealing connection of central through-hole (36), just slide bar (33) can slide in central through-hole (36), the big one end of external diameter on slide bar (33) with the first end sealing connection of sealing member (35), the one end of every spring (34) in a plurality of springs (34) with the terminal surface fixed connection of the second end of positioning member (32), the other end of every spring (34) with step face fixed connection on slide bar (33), the second end of sealing member (35) be used for slide bar (33) with the gas effect of filling in plenum chamber (4) is sealed down through-hole (21).

4. A switch well device according to claim 1, characterized in that said elastic means (3) comprise a sealing member (35) and an elastic member (37);

The first end of the elastic component (37) is connected with the first end of the sealing component (35) in a sealing mode, the second end of the elastic component (37) is connected with the inner wall of the air outlet of the inflatable chamber (4) in a sealing mode, and the second end of the sealing component (35) is used for sealing the through hole (21) under the action of gas filled in the elastic component (37) and the inflatable chamber (4).

5. a well switching device according to claim 3 or 4, characterized in that said sealing member (35) comprises a valve ball (38) and a valve stem (39);

The valve ball (38) and the valve rod (39) are designed in an integrated mode, one end, which is not connected with the valve ball (38), of the valve rod (39) is connected with the first end of the elastic component (37) in a sealing mode, and the valve ball (38) is used for sealing the through hole (21) under the action of the elastic component (37) and gas filled in the inflation cavity (4).

6. a switch well device according to claim 4, characterized in that the elastic member (37) is a bellows.

7. Switching well device according to claim 4, characterized in that the sealing member (36), the resilient member (37) and the aeration chamber (4) are of one-piece design.

8. The well switching device according to claim 1 or 2, further comprising a valve cover (8);

the side of the inflation cavity (4) is provided with a circular boss (41), the circular boss (41) is clamped on the end face of the third joint (13), and the valve cover (8) is sleeved on the inflation cavity (4) and is fixedly connected with the third joint (13).

9. a switch well device according to claim 1 or 2, characterized in that the pressure regulating mechanism (5) comprises a pressure reducing valve (51);

The first opening of the pressure reducing valve (51) is connected with the inflation inlet of the inflation cavity (4), and the second opening of the pressure reducing valve (51) is connected with the oil pipe and/or the casing of the gas well through the gas source pipeline (6).

10. The well switching device according to claim 9, wherein when the second opening of the pressure reducing valve (51) is connected to the tubing of the gas well through the gas supply line (6), the pressure regulating mechanism (5) further comprises a first shut-off valve (52), the first shut-off valve (52) being adapted to communicate with or shut off a passage between the second opening of the pressure reducing valve (51) and the tubing of the gas well; and/or the presence of a gas in the gas,

when the second opening of the pressure reducing valve (51) is connected with the casing of the gas well through the gas source pipeline (6), the pressure regulating mechanism (5) further comprises a second stop valve (53), and the second stop valve (53) is used for communicating or closing a channel between the second opening of the pressure reducing valve (51) and the casing of the gas well.

Technical Field

The invention relates to the field of gas production engineering, in particular to a well opening and closing device.

background

In recent years, with the deep development of gas fields, the natural energy in the gas fields is lower, so that more and more gas wells cannot realize continuous self-injection production. However, for continued development of gas fields, increasing their recovery, most gas wells eventually move to a batch production mode. Among them, a gas well refers to a well drilled in a gas field for developing the gas field. The intermittent production mode refers to a mode in which production channels of a gas well are opened or closed in an alternating cycle to produce.

for a gas well in an intermittent production mode, in order to improve the exploitation efficiency of the gas well, reduce the labor intensity of operators and reduce the exploitation cost of the gas well, an automatic intermittent well opening and closing technology is provided, and a set of switch device is mainly installed at the mouth of the gas well and is matched with a corresponding control system. Specifically, the control system acquires production data of the gas well, and controls the switch device to open the production channel of the gas well when the control system determines that the acquired production data meets the condition of opening the production channel.

However, when the technology is used for realizing intermittent production of the gas well, the switching device and the control system are complex to install, high in automation requirement and high in construction cost, so that the working difficulty of operators is increased, and the production cost of the gas well is increased.

Disclosure of Invention

the invention provides a well switching device which can be used for opening or closing a production channel of a gas well in an alternate circulation mode and realizing an intermittent production mode of the gas well. The technical scheme is as follows:

In one aspect, there is provided a switch well device comprising: the device comprises a device body, a valve seat, an elastic mechanism, an inflation cavity, a pressure regulating mechanism and an air source pipeline;

the gas well gas valve comprises a valve seat, a gas well oil pipe and a gas well oil pipe, wherein the gas well oil pipe is connected with the gas well oil pipe through a first connector;

The one end at gas outlet place of inflation cavity with the third connects sealing connection, the inflation inlet of inflation cavity passes through pressure regulating mechanism with the air supply pipeline with the oil pipe and/or the bushing of gas well, the inflation cavity is used for filling gas, the first end of elastic mechanism with the inner wall sealing connection of the gas outlet of inflation cavity, the second end of elastic mechanism is located the inner chamber that the third connects, and is used for the gas effect of filling the gas cavity is sealed down the through-hole.

optionally, the well switching device further comprises a limit elastic claw;

The side face of the second end of the elastic mechanism is provided with a bulge, the first end of the limiting elastic claw is fixedly connected with the end face of one end of the inflatable chamber where the air outlet is located, the second end of the limiting elastic claw is provided with a plurality of elastic resistance claws, and the elastic resistance claws are clamped on the upper portion or the lower portion of the bulge.

optionally, the resilient mechanism comprises a sealing member and a resilient member;

The first end of the elastic component is connected with the first end of the sealing component in a sealing mode, the second end of the elastic component is connected with the inner wall of the air outlet of the inflation cavity in a sealing mode, and the second end of the sealing component is used for sealing the through hole under the action of gas filled in the elastic component and the inflation cavity.

Optionally, the sealing member comprises a valve ball and a valve stem;

the valve ball and the valve rod are designed in an integrated mode, one end, which is not connected with the valve ball, of the valve rod is connected with the first end of the elastic component in a sealing mode, and the valve ball is used for sealing the through hole under the action of the elastic component and gas filled in the inflation cavity.

Optionally, the resilient member is a bellows.

Optionally, the sealing member, the resilient member and the inflation chamber are of unitary design.

Optionally, the switch well device further comprises a valve cover;

The side of the inflation cavity is provided with a circular boss clamped on the end face of the third connector, and the valve cover is sleeved on the inflation cavity and fixedly connected with the third connector.

Optionally, the pressure regulating mechanism comprises a pressure reducing valve;

the first opening of the pressure reducing valve is connected with the inflation inlet of the inflation cavity, and the second opening of the pressure reducing valve is connected with the oil pipe and/or the sleeve of the gas well through the gas source pipeline.

optionally, when the second opening of the pressure reducing valve is connected with the oil pipe of the gas well through the gas source pipeline, the pressure regulating mechanism further comprises a first stop valve, and the first stop valve is used for communicating or closing a passage between the second opening of the pressure reducing valve and the oil pipe of the gas well; and/or the presence of a gas in the gas,

when the second opening of the pressure reducing valve is connected with the casing of the gas well through the gas source pipeline, the pressure regulating mechanism further comprises a second stop valve, and the second stop valve is used for communicating or shutting off a channel between the second opening of the pressure reducing valve and the casing of the gas well.

The technical scheme provided by the invention has the beneficial effects that at least:

the switching well device is fixedly connected with an oil pipe of a gas well through a first joint on the device body, a second joint is fixedly connected with a production pipeline of the gas well, an inflation inlet of the inflation cavity is connected with the oil pipe and/or a sleeve of the gas well through a pressure regulating mechanism and an air source pipeline, and the pressure regulating mechanism is adjusted to fill gas into the inflation cavity. If the production channel of the gas well is opened, the pressure of the gas in the oil pipe is gradually reduced, and when the pressure of the gas in the oil pipe is smaller than the pressure of the gas in the inflation chamber, namely the pressure of the second end of the elastic mechanism is smaller than the pressure of the gas in the inflation chamber, the second end of the elastic mechanism moves towards the direction close to the valve seat to close the production channel of the gas well. Then, because the oil pipe is in a closed state, gas produced by the gas well is stored in the oil pipe, so that the pressure of the gas in the oil pipe is gradually increased, when the pressure of the gas in the oil pipe is greater than the pressure of the gas in the inflation cavity, namely the pressure of the second end of the elastic mechanism is greater than the pressure of the gas in the inflation cavity, and the second end of the elastic mechanism moves in a direction away from the valve seat to open a production channel of the gas well. Therefore, the production channel of the gas well can be closed or opened circularly through the well opening and closing device, the automation requirement of gas well production is lowered, the working difficulty of operators is lowered, and the production cost of the gas well is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a well switching device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a well switching device according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a spring mechanism according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a spring mechanism according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a well switching device according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a well switching device according to an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a well switching device according to an embodiment of the present invention.

Reference numerals:

1: a device body; 2: a valve seat; 3: an elastic mechanism; 4: a plenum chamber; 5: a pressure regulating mechanism; 6: a gas source line; 7: limiting elastic claws; 8: a valve cover;

11: a first joint; 12: a second joint; 13: a third joint;

21: a through hole;

31: a protrusion; 32: a positioning member; 33: a slide bar; 34: a spring; 35: a sealing member; 36: a central through hole; 37: an elastic member; 38: a valve ball; 39: a valve stem;

41: a circular boss;

51: a pressure reducing valve; 52: a first shut-off valve; 53: a second stop valve;

71: elastic resistance claws.

Detailed Description

in order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

fig. 1 is a schematic structural diagram of a well switching device according to an embodiment of the present invention. Referring to fig. 1, the well switching apparatus includes: the device comprises a device body 1, a valve seat 2, an elastic mechanism 3, an inflation chamber 4, a pressure regulating mechanism 5 and an air source pipeline 6.

The device body 1 is of a three-way structure, a first joint 11 of the device body 1 is used for being connected with an oil pipe of a gas well, a second joint 12 of the device body 1 is used for being connected with a production pipeline of the gas well, the valve seat 2 is fixed in an inner cavity of the first joint 11, the valve seat 2 is provided with a through hole 21, the center line of the through hole 21 coincides with the center line of the first joint 11, one end of the inflatable chamber 4 where the gas outlet is located is hermetically connected with the third joint 13, the inflation port of the inflatable chamber 4 is connected with the oil pipe and/or the casing pipe of the gas well through the pressure regulating mechanism 5 and the gas source pipeline 6, the inflatable chamber 4 is used for filling gas, the first end of the elastic mechanism 3 is hermetically connected with the inner wall of the gas outlet of the inflatable chamber 4, and the second end of the elastic mechanism 3 is located in the inner cavity of the third joint 13 and is used for sealing the through hole 21 under the action of the gas filled in the inflatable chamber 4.

the device body 1 may be a T-shaped three-way structure, and certainly, may also be a three-way structure of other shapes, as long as the second end of the elastic mechanism 3 can seal the through hole 21 under the action of the gas filled in the inflating chamber 4, which is not limited in the embodiment of the present invention. When the first end of the elastic mechanism 3 is connected with the inner wall of the air outlet of the inflatable chamber 4 in a sealing manner, if the elastic mechanism 3 can extend under the action of external force, the first end of the elastic mechanism 3 can be fixedly connected with the air outlet of the inflatable chamber 4 so as to ensure that the second end of the elastic mechanism 3 moves towards the direction close to the valve seat 2 under the action of gas filled in the inflatable chamber 4, thereby realizing the sealing of the through hole 21. Of course, the first end of the elastic mechanism 3 can be connected with the inner wall of the air outlet of the inflating chamber 4 in a sealing way by welding. If the end face of the first end of the elastic mechanism 3 is not provided with a central hole, the outer wall of the first end of the elastic mechanism 3 is in sealing connection with the inner wall of the air outlet of the inflating chamber 4, so that the elastic mechanism 3 can move along the central line of the air outlet of the inflating chamber 4, and when moving towards the direction close to the valve seat 2, the sealing of the through hole 21 is realized.

It should be noted that, when the pressure of the gas in the inflating chamber 4 is greater than the pressure of the second end of the elastic mechanism 3, the second end of the elastic mechanism 3 can move toward the direction close to the valve seat 2, so as to seal the through hole 21; when the pressure of the gas in the inflating chamber 4 is lower than the pressure of the second end of the elastic mechanism 3, the second end of the elastic mechanism 3 can move away from the valve seat 2, so that the through hole 21 is communicated.

When a production channel of a gas well is opened or closed through the well opening and closing device, the well opening and closing device is fixedly connected with an oil pipe of the gas well through a first connector 11 on the device body 1, a second connector 12 is fixedly connected with a production pipeline of the gas well, an inflation inlet of the inflation cavity 4 is connected with the oil pipe and/or a sleeve of the gas well through a pressure regulating mechanism 5 and a gas source pipeline 6, namely, the inflation inlet of the inflation cavity 4 is connected with the oil pipe of the gas well through the pressure regulating mechanism 5 and the gas source pipeline 6, the inflation inlet of the inflation cavity 4 is connected with the sleeve of the gas well through the pressure regulating mechanism 5 and the gas source pipeline 6, or the inflation inlet of the inflation cavity 4 is connected with the oil pipe and the sleeve of the gas well through the pressure regulating mechanism 5 and the gas source pipeline 6. Thereafter, the pressure regulating mechanism 5 is adjusted to fill the gas in the gas-filled chamber 4. If the production channel of the gas well is opened, the pressure of the gas in the oil pipe is gradually reduced, and when the pressure of the gas in the oil pipe is smaller than the pressure of the gas in the inflating chamber 4, namely the pressure of the second end of the elastic mechanism 3 is smaller than the pressure of the gas in the inflating chamber 4, the second end of the elastic mechanism 3 moves towards the direction close to the valve seat 2, so that the through hole 21 is sealed to close the production channel of the gas well. Then, because the oil pipe is in a closed state, gas produced by the gas well is stored in the oil pipe, so that the pressure of the gas in the oil pipe is gradually increased, when the pressure of the gas in the oil pipe is greater than the pressure of the gas in the inflating chamber 4, namely the pressure of the second end of the elastic mechanism 3 is greater than the pressure of the gas in the inflating chamber 4, the second end of the elastic mechanism 3 moves in a direction away from the valve seat 2, and the through hole 21 is communicated to open a production channel of the gas well. Therefore, the production channel of the gas well can be closed or opened circularly through the well opening and closing device, the automation requirement of gas well production is lowered, the working difficulty of operators is lowered, and the production cost of the gas well is reduced.

It should be noted that, when the production passage of the gas well is cyclically closed or opened by the well opening and closing device, if the pressure of the gas in the oil pipe drops sharply after the production passage of the gas well is opened, the pressure of the gas in the oil pipe may be lower than the pressure of the gas in the gas charging chamber 4 in a short time, and at this time, the second end of the elastic mechanism 3 seals the through hole 21 to close the production passage of the gas well. Or, after the production channel of the gas well is closed, the pressure of the gas in the oil pipe is increased sharply, and the pressure of the gas in the oil pipe may be higher than the pressure of the gas in the aeration chamber 4 in a short time, and at this time, the through hole 21 is conducted to open the production channel of the gas well. This can result in frequent opening or closing of the production path of the gas well, easily causing damage to the well switching device and affecting the production of the gas well. Therefore, referring to fig. 2, in order to avoid frequent opening or closing of the well opening and closing device, reduce the sealing effect between the second end of the elastic mechanism 3 and the through hole 21, and simultaneously prolong the time length between opening or closing of the production channel, the well opening and closing device may further include a limiting elastic claw 7, a protrusion 31 is disposed on a side surface of the second end of the elastic mechanism 3, a first end of the limiting elastic claw 7 is fixedly connected with an end surface of an end where the gas outlet of the gas filling chamber 4 is located, a plurality of elastic resistance claws 71 are disposed on a second end of the limiting elastic claw 7, and the plurality of elastic resistance claws 71 are clamped on an upper portion or a lower portion of the protrusion 31.

Wherein, the side of the elastic mechanism 3 can be provided with a plurality of bulges 31 along the circumferential direction, the bulges 31 correspond to the elastic resistance claws 71 one by one, of course, the number of the bulges 31 can also be larger than the number of the elastic resistance claws 71, the bulges 31 can be uniformly distributed on the circumference of the elastic mechanism 3, and the elastic resistance claws 71 can also be uniformly distributed along the circumferential direction of the elastic mechanism 3. For example, the side surface of the elastic means 3 is provided with 6 protrusions 31 along the circumferential direction, and the circumferential angle between any two adjacent protrusions 31 is 60 degrees. At this time, the second end of the spacing elastic claw 7 may be provided with 6 elastic resistance claws 71, and the circumferential angle between any adjacent two elastic resistance claws 71 is 60 degrees, or the second end of the spacing elastic claw 7 may be provided with 3 elastic resistance claws 71, and the circumferential angle between any adjacent two elastic resistance claws 71 is 120 degrees. Of course, the side surface of the elastic mechanism 3 may be provided with a circle of protrusions 31 along the circumferential direction, which is not limited in the embodiment of the present invention.

Each elastic resistance claw 71 of the plurality of elastic resistance claws 71 can deform in a direction away from the side surface of the elastic mechanism 3 under the action of an external force, when the production channel of the gas well is in an open state, the plurality of elastic resistance claws 71 are clamped at the lower part of the bulge 31, and when the production channel of the gas well is in a closed state, the plurality of elastic resistance claws 71 are clamped at the upper part of the bulge 31.

Thus, when the production channel of the gas well is opened, the produced gas in the gas well is conveyed along the production pipeline, so that the pressure of the gas in the oil pipe is gradually reduced. When the pressure of the gas in the oil pipe is lower than the pressure of the gas in the gas charging chamber 4, the second end of the elastic mechanism 3 tends to move in a direction close to the valve seat 2. However, the plurality of elastic resistance claws 71 are clamped at the lower part of the protrusion 31 to generate a blocking effect on the movement trend of the second end of the elastic mechanism 3, so that the closing of the second end of the elastic mechanism 3 to the through hole 21 is delayed, and the opening duration of the production channel of the gas well is prolonged. When the difference between the first acting force and the second acting force is larger than the resistance of the plurality of elastic resistance claws 71 to the protrusion 31, the second end of the elastic mechanism 3 moves in a direction close to the valve seat 2, thereby sealing the through hole 21 and closing the production passage of the gas well, and at this time, the plurality of elastic resistance claws 71 are caught at the lower portion of the protrusion 31. Then, because the oil pipe is in a closed state, the produced gas of the gas well is stored in the oil pipe, and the pressure of the gas in the oil pipe is gradually increased. When the pressure of the gas in the oil pipe is higher than that of the gas in the inflating chamber 4, the second end of the elastic mechanism 3 tends to move away from the valve seat 2, and the plurality of elastic resistance claws 71 are clamped at the lower parts of the protrusions 31 to block the movement tendency of the second end of the elastic mechanism 3, so that the closing time of a gas well production channel is prolonged. When the difference between the second acting force and the first acting force is larger than the resistance of the elastic resistance claws 71 to the bulge 31, the second end of the elastic mechanism 3 moves away from the valve seat 2 to open the production channel of the gas well, and at the moment, the elastic resistance claws 71 are clamped at the lower part of the bulge 31.

Wherein, the first acting force refers to the acting force exerted by the pressure of the gas in the inflating chamber 4 on the first end of the elastic mechanism 3, and the second acting force refers to the acting force exerted by the pressure of the gas in the oil pipe on the second end of the elastic mechanism 3.

it should be noted that, when the second end of the elastic mechanism 3 is hindered from moving toward the valve seat 2 or away from the valve seat 2 by the plurality of elastic resistance claws 71, the resistance generated by each elastic resistance claw 71 may be determined by parameters such as the material and the size of the elastic resistance claw 71. Therefore, for a well switching device requiring different resistance values, a plurality of elastic resistance claws 71 can be arranged at the second end of the limiting elastic claw 7 based on the parameters such as the manufacturing material and the size of the elastic resistance claws 71. That is, for gas wells requiring different pressures to open or close, the required resistance of the limiting elastic claw 7 to the elastic mechanism 3 can be determined by the required pressure and the pressure of the gas filled in the inflating chamber 4, and based on the magnitude of the resistance, the appropriate limiting elastic claw 7 is selected so that the gas well can be opened or closed at the required pressure.

When the second end of the resilient means 3 is moved in a direction close to the valve seat 2 to achieve sealing of the through hole 21, in a possible implementation, referring to fig. 3, the resilient means 3 may comprise a positioning member 32, a sliding rod 33, a plurality of springs 34 and a sealing member 35.

The first end of the positioning component 32 is fixedly connected with the inner wall of the air outlet of the inflating chamber 4, the positioning component 32 is provided with a central through hole 36, the central through hole 36 is communicated with the inflating chamber 4, the sliding rod 33 is step-shaped along the axial direction, one end with a small outer diameter on the sliding rod 33 is hermetically connected with the inner wall of the central through hole 36, the sliding rod 33 can slide in the central through hole 36, one end with a large outer diameter on the sliding rod 33 is hermetically connected with the first end of the sealing component 35, one end of each spring 34 in the plurality of springs 34 is fixedly connected with the end face of the second end of the positioning component 32, the other end of each spring 34 is fixedly connected with a step face on the sliding rod 33, and the second end of the sealing component 35 is used for sealing the through hole 21 under the action of air.

Referring to fig. 3, the protrusion 31 may be disposed on a side surface of an end of the sliding rod 33 having a larger outer diameter, and of course, the protrusion 31 may also be disposed on a side surface of a first end of the sealing member 35. The sliding rod 33 may be integrally formed with the sealing member 35, and when the sliding rod 33 slides in the central through hole 36, the sealing member 35 is driven to seal the through hole 21. The plurality of springs 34 may be uniformly distributed on the circumference of the sliding rod 33, and of course, may be randomly distributed, which is not limited in the embodiment of the present invention.

In order to facilitate the sealing connection between the sealing member 35 and the elastic member 37, referring to fig. 3, the sealing member 35 includes a valve ball 38 and a valve rod 39, the valve ball 38 and the valve rod 39 may be integrally formed, an end of the valve rod 39 not connected to the valve ball 38 is sealingly connected to a first end of the elastic member 37, and the valve ball 38 is used for sealing the through hole 21 under the action of the elastic member 37 and the gas filled in the inflation chamber 4. Of course, the valve ball 38 and the valve stem 39 may also be fixedly connected by welding, which is not limited in the embodiment of the present invention. When the valve rod 39 is connected with the first end of the elastic component 37 in a sealing manner, the valve rod 39 can extend into the elastic component 37, and then the sealing connection is realized through welding or other connection modes.

In another possible implementation, referring to fig. 4, the elastic means 3 may also comprise a sealing member 35 and an elastic member 37, a first end of the elastic member 37 being sealingly connected to a first end of the sealing member 35, a second end of the elastic member 37 being sealingly connected to an inner wall of the air outlet of the inflatable chamber 4, and a second end of the sealing member 35 being adapted to seal the through hole 21 under the influence of the elastic member 37 and the air filled in the inflatable chamber 4.

Referring to fig. 4, the protrusion 31 may be disposed on a side surface of the first end of the elastic member 37, and of course, the protrusion 31 may also be disposed on a side surface of the first end of the sealing member 35, which is not limited in the embodiment of the present invention.

when the pressure of the gas in the inflating chamber 4 is higher or lower than the pressure of the gas in the oil pipe, the first end of the elastic component 37 has a tendency to move towards the direction close to the valve seat 2 or away from the valve seat 2, so as to drive the sealing component 35 to have a tendency to move towards the direction close to the valve seat 2 or away from the valve seat 2, so as to open or close the production channel of the gas well.

The elastic member 37 may be a member that is extended or shortened by an external force, for example, the elastic member 37 may be a bellows, as long as the elastic member 37 can prevent the gas filled in the inflation chamber 4 from leaking after being respectively connected to the inflation chamber 4 and the sealing member 35, and when the pressure of the gas in the inflation chamber 4 is greater than or less than the pressure of the gas in the oil tube, the first end of the elastic member 37 tends to move in a direction close to the valve seat 2 or in a direction away from the valve seat 2. In order to facilitate the sealing connection of the second end of the elastic member 37 with the inner wall of the air outlet of the inflating chamber 4, a protrusion is provided on the side of the first end of the elastic member 37, and to ensure that the elastic member 37 can be extended, referring to fig. 4, in a possible implementation, the side of the first end and the side of the second end of the elastic member 37 may be flat, and the side of the middle portion of the elastic member 37 may be serrated.

of course, the elastic member 37 may also be a sealing rod, etc., as long as after the second end of the elastic member 37 is connected to the inner wall of the air outlet of the inflating chamber 4 in a sealing manner, the elastic member 37 can move along the center line of the air outlet of the inflating chamber 4 and drive the sealing member 35 to seal the through hole 21.

In addition, the sealing member 35, the elastic member 37 and the inflating chamber 4 may be integrally designed to enhance the sealing property of the inflating chamber 4 with gas. Of course, the sealing member 35 and the elastic member 37 may be hermetically connected by welding, which is not limited in the embodiment of the present invention.

For the well opening and closing device, when the end where the air outlet on the inflating chamber 4 is located is connected with the third joint 13 in a sealing manner, referring to fig. 1 or fig. 2, in a first possible implementation manner, an external thread may be arranged at the end where the air outlet is located, an internal thread may be arranged at the third joint 13, and then the sealing connection between the inflating chamber 4 and the third joint 13 is achieved in a threaded connection manner. In order to ensure the sealing effect between the aeration chamber 4 and the third connector 13, a sealing ring may be provided between the side of the aeration chamber 4 and the inner wall of the third connector 13.

referring to fig. 5, in a second possible implementation manner, the well opening and closing device may further include a valve cap 8, a circular boss 41 is disposed on a side surface of the inflation chamber 4, the circular boss 41 is clamped on an end surface of the third connector 13, and the valve cap 8 is sleeved on the inflation chamber 4 and is fixedly connected to the third connector 13. Thus, the end of the inflation chamber 4 where the air outlet is located extends into the third connector 13, so that the circular boss 41 is clamped on the end surface of the third connector 13, and then the end of the valve cover 8 along the inflation port of the inflation chamber 4 is sleeved on the inflation chamber 4 and is fixedly connected with the third connector 13, so that the circular boss 41 is extruded to realize the sealing connection between the inflation chamber 4 and the third connector 13. In order to facilitate the replacement of the limiting elastic claw 7 in the later period, the valve cover 8 and the third joint 13 can be fixedly connected through threads, and in order to ensure the sealing effect between the inflating chamber 4 and the third joint 13, a sealing ring can be arranged between the annular boss 41 and the end surface of the third joint 13.

With this well switching device, in order to facilitate filling of the plenum chamber 4 with gas and to facilitate determination of the pressure at which the plenum chamber 4 is filled with gas, the pressure regulating mechanism 5 may comprise a pressure reducing valve 51, see fig. 6, a first opening of the pressure reducing valve 51 being connected to the charging port of the plenum chamber 4 and a second opening of the pressure reducing valve 51 being connected to the tubing and/or casing of the gas well via the gas supply line 6. The gas in the tubing and/or casing of the gas well is conveyed along the gas supply line 6 to the second opening of the pressure reducing valve 51 and, after having been pressure reduced by the pressure reducing valve 51, is conveyed along the first opening and fills the plenum chamber 4. After the pressure reducing valve 51 is adjusted, the pressure of the gas delivered by the pressure reducing valve 51 along the first opening is a fixed value, so that an operator can conveniently confirm the pressure of the reloaded gas in the inflating chamber 4. Of course, the pressure value after adjustment may be forgotten after the pressure reducing valve 51 is adjusted, or the gas in the inflation chamber 4 leaks after a long time, so that the operator can know the pressure of the gas in the inflation chamber 4 in time, a pressure gauge may be further disposed between the first opening of the pressure reducing valve 51 and the inflation port of the inflation chamber 4, and the pressure gauge displays the current gas pressure in the inflation chamber 4.

It should be noted that, because the gas in the inflation chamber 4 is in a closed state, after the inflation chamber 4 is refilled with gas, the pressure of the gas in the inflation chamber 4 does not need to be adjusted in a short time, that is, the gas does not need to be filled into the inflation chamber 4 through the oil pipe and/or the casing of the gas well in a short time. In this way, in order to avoid gas leakage between the oil pipe and/or the casing of the gas well and the second opening of the pressure reducing valve 51, when the second opening of the pressure reducing valve 51 is connected to the oil pipe of the gas well through the gas supply line 6, the pressure regulating mechanism 5 may further include a first shut-off valve 52, see fig. 7, the first shut-off valve 52 being configured to communicate with or shut off a passage between the second opening of the pressure reducing valve 51 and the oil pipe of the gas well. Alternatively, when the second opening of the pressure reducing valve 51 is connected to the casing of the gas well through the gas supply line 6, the pressure regulating mechanism 5 may further include a second shut-off valve 53, and the second shut-off valve 53 is used to communicate with or shut off a passage between the second opening of the pressure reducing valve 51 and the casing of the gas well. Alternatively, when the second opening of the pressure reducing valve 51 is connected to the tubing and casing of the gas well through the gas supply line 6, the pressure regulating mechanism 5 may further include a first shut-off valve 52 and a second shut-off valve 53, the first shut-off valve 52 being used to communicate or shut off a passage between the second opening of the pressure reducing valve 51 and the tubing of the gas well, and the second shut-off valve 53 being used to communicate or shut off a passage between the second opening of the pressure reducing valve 51 and the casing of the gas well.

of course, the communication or the shutoff between the second opening of the pressure reducing valve 51 and the oil pipe and/or the casing may also be implemented by other valves, for example, the communication may be implemented by the first ball valve and the second ball valve respectively, which is not limited in the embodiment of the present invention.

In the embodiment of the invention, the well switching device is connected with an oil pipe of a gas well through a first joint on the device body, a second joint is connected with a production pipeline of the gas well, and an inflation inlet of the inflation cavity is connected with the oil pipe and/or a sleeve of the gas well through a pressure regulating mechanism and an air source pipeline. And then, opening the first stop valve and/or the second stop valve, and filling gas into the inflation cavity by adjusting the pressure regulating mechanism so as to enable the inflation cavity to be refilled with gas with certain pressure. In the production process of the gas well, gas produced by the gas well is output along a production pipeline, so that the pressure of the gas in the oil pipe is gradually reduced, and when the pressure of the gas in the oil pipe is smaller than the pressure of the gas in the inflation cavity and the difference value between the first acting force and the second acting force is larger than the resistance of the elastic resistance claws to the protrusions, the second end of the elastic mechanism moves towards the direction close to the valve seat so as to close a production channel of the gas well. And then, because the oil pipe is in a closed state, gas produced by the gas well is stored in the oil pipe, so that the pressure of the gas in the oil pipe is gradually increased, and when the pressure of the gas in the oil pipe is greater than the pressure of the gas in the inflation cavity and the difference between the second acting force and the first acting force is greater than the resistance of the elastic resistance claws to the protrusions, the second end of the elastic mechanism moves towards the direction far away from the valve seat so as to open a production channel of the gas well. After the production channel of the gas well is opened, the gas well is in the production process, so that the production channel of the gas well can be closed and opened circularly through the well opening and closing device, the automation requirement of gas well production is lowered, the working difficulty of operators is lowered, and the production cost of the gas well is reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.