CN213205627U

CN213205627U - Bridge plug sits to seal with air-vent valve and bridge plug sits and seals tubular column

Info

Publication number: CN213205627U
Application number: CN202021646518.XU
Authority: CN
Inventors: 陈永浩; 王晓颖; 陈勇光; 鲁俊; 姜鹏; 王龙飞
Original assignee: China Petroleum and Chemical Corp; Petroleum Engineering Technology Research Institute of Sinopec Zhongyuan Oilfield Co
Current assignee: China Petroleum and Chemical Corp; Petroleum Engineering Technology Research Institute of Sinopec Zhongyuan Oilfield Co
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2021-05-14
Anticipated expiration: 2030-08-10

Abstract

The utility model relates to a bridge plug sits to seal with air-vent valve and bridge plug sits and seals tubular column. Pressure regulating valve for bridge plug setting, comprising: the valve body is provided with an upper joint and a lower joint, and a communicating channel is arranged in the valve body and is used for communicating the upper joint and the lower joint; the valve seat is positioned on the communication channel; the valve ball is used for being in sealing fit with the valve seat to close the communication channel; the sliding core is assembled in the valve body in a sliding and sealing mode so as to push the valve ball to be in sealing fit with the valve seat; the pressure balance cavity is arranged in the valve body; the elastic element is used for applying elastic acting force to the sliding core so as to drive the sliding core to push the valve ball to move towards the direction of closing the communication channel; the pressure balance channel is communicated with the pressure balance cavity and the outside of the valve body, and is used for allowing formation pressure to enter the pressure balance cavity and applying the formation pressure to the sliding core so as to drive the sliding core to push the valve ball to move towards the direction of closing the communication channel; and a throttling structure disposed on the communication passage and downstream of the valve seat for throttling the liquid flowing through the valve seat to reduce the fluid pressure.

Description

Bridge plug sits to seal with air-vent valve and bridge plug sits and seals tubular column

Technical Field

The utility model relates to a bridge plug sits to seal with air-vent valve and bridge plug sits and seals tubular column.

Background

With the extension of the gas field failure type development time, the formation pressure is gradually reduced, and the formation pressure is far lower than the original formation pressure in the middle and later development stages, so that when an upper production layer is mined, a lower production layer or a water outlet layer of a gas well needs to be blocked. In the prior art, the plugging of a production layer or a water outlet layer at the lower part of a gas well is generally realized by setting a hydraulic bridge plug, and a setting tool is required to assist the setting of the bridge plug when the hydraulic bridge plug is set.

The hollow hydraulic setting tool for setting the solid bridge plug, disclosed in the Chinese utility model patent with the publication number of CN204827300U, comprises a movable component and a fixed component, wherein the movable component comprises a first-stage shell, a first-stage sliding core, a second-stage shell, a second-stage sliding core and a loading sleeve which are sequentially connected, and the fixed component comprises an upper joint, a mandrel and a connecting sleeve; during the use, the bridging plug passes through the shear pin to be fixed on the connecting sleeve, the top connection passes through tip threaded connection oil pipe, need seat the bridging plug behind design well depth under seat instrument and bridging plug, put into the suppressing ball to intraductal this moment, suppress the ball and arrive the dabber after, intraductal pressure that begins to suppress, when pressure reaches a definite value, pressure passes through one-level pressure transmission hole, second grade pressure transmission hole and promotes one-level sliding core, second grade sliding core is down for the dabber, and then promote loading cover down for the bridging plug, with compression bridging plug, realize the seat of bridging plug.

In the prior art, when the liquid level of an oil pipe is higher than the liquid level of a sleeve by a certain value in the setting process of a bridge plug, setting pressure is formed, liquid is continuously filled, and the bridge plug is continuously set under the action of the internal and external pressure difference of the oil pipe and the sleeve. In the bridge plug setting process, the liquid level in the oil pipe is always below a wellhead, the depth of the liquid level in the oil pipe is not easy to judge, namely, the hydraulic pressure generated by a liquid column is not easy to obtain, so that the bridge plug setting state cannot be accurately judged, if the hydraulic pressure is small, the setting force transmitted to the bridge plug by a bridge plug setting tool is insufficient, and the bridge plug setting is unstable; if the hydraulic pressure is large, the setting force transmitted to the bridge plug by the bridge plug setting tool can fracture the rubber barrel, and the bridge plug setting needs to be replaced again.

Aiming at the problems, an oil pipe successive quantitative liquid injection and setting mode is generally adopted, the single liquid injection amount and the total amount are controlled according to the pressure of a shaft and the depth of a liquid level in the shaft before construction, the bridge plug is guaranteed to be slowly pressurized underground, a series of actions such as setting, releasing and the like are gradually completed, the shaft pressure or the liquid level depth needs to be measured in advance, and the construction process and the cost investment are increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a pressure regulating valve for bridge plug setting, which aims to solve the technical problems that in the prior art, the pressure of a shaft or the depth of a liquid level needs to be measured in advance in the bridge plug setting process, and the construction process and the cost investment are increased; an object of the utility model is to provide a bridge plug sits and seals tubular column to bridge plug sits and seals the in-process and need measure pit shaft pressure or liquid level degree of depth in advance among the solution prior art, has increased the technical problem that construction process and expense drop into.

In order to achieve the above purpose, the utility model discloses the technical scheme of air-vent valve for bridge plug setting is:

pressure regulating valve for bridge plug setting, comprising:

the valve body is provided with an upper joint and a lower joint, and a communicating channel is arranged in the valve body and is used for communicating the upper joint and the lower joint;

a valve seat on the communication passage;

a valve ball for sealing engagement with the valve seat to close the communication passage;

the sliding core is assembled in the valve body in a sliding and sealing mode so as to push the valve ball to be in sealing fit with the valve seat;

the pressure balance cavity is arranged in the valve body;

the elastic element is used for applying elastic acting force to the sliding core so as to drive the sliding core to push the valve ball to move towards the direction of closing the communication channel;

the pressure balance channel is communicated with the pressure balance cavity and the outside of the valve body, so that formation pressure enters the pressure balance cavity and is applied to the sliding core, and the sliding core pushes the valve ball to move towards the direction of closing the communication channel;

and the throttling structure is arranged on the communication passage and is positioned at the downstream of the valve seat, and is used for throttling the liquid flowing through the valve seat so as to reduce the fluid pressure.

The beneficial effects are that: through the synergistic effect of the elastic part and the formation pressure, before the liquid is canned in the oil pipe, the valve ball and the valve seat are always kept in a sealing state, so that the communication channel is in a closed state; after the pipe column is lowered to the designed depth, slowly filling liquid into the oil pipe, wherein the stratum pressure can balance the liquid column pressure in the oil pipe due to the pressure difference between the upper part and the lower part of the sliding core, so that the pressure of the liquid filled in the oil well is not enough to prop open the valve ball, and the valve ball can be opened or is about to be opened until the liquid level of the liquid filled in the oil well rises to a well head; then, the slow setting of the bridge plug can be realized by pressurizing through the pump truck, and the setting pressure is the pressure of a liquid column in the oil pipe plus the pressure of the pump, so that the pressure regulating valve can monitor and control the pressure of the construction pump in real time, and the normal setting of the bridge plug is ensured. The throttling structure is used for throttling liquid and transmitting pressure, so that the sliding core vibrates and oscillates repeatedly in the axial direction of the valve body, the pressure when the valve ball is opened is relieved, and the liquid inlet of the lower joint is smooth.

Furthermore, the valve body is provided with a cavity, the sliding core is assembled in the cavity in a sliding and sealing mode, an assembly gap is reserved between the sliding core and the cavity wall of the cavity, the assembly gap forms a throttling gap, and the throttling gap is the throttling structure.

The beneficial effects are that: the design can directly utilize the assembly clearance reserved between the sliding core and the cavity wall of the cavity, thereby saving the processing procedure and reducing the cost.

Furthermore, the peripheral surface of the sliding core is provided with more than two axial grooves which are arranged at intervals along the circumferential direction of the sliding core, and each axial groove extends along the axial direction of the sliding core.

The beneficial effects are that: in order to ensure that the fluid can flow and transmit pressure to the lower part through the communication channel at the moment when the sliding core is opened, an axial groove is arranged on the outer peripheral surface of the sliding core and facilitates the fluid to flow through so as to reduce throttling pressure loss.

Furthermore, the valve seat is an adjusting valve seat which is in threaded connection with the valve body, and the adjusting valve seat adjusts the pre-compression amount of the elastic piece by jacking the valve ball and the sliding core.

The beneficial effects are that: the precompression of the elastic element is adjusted by screwing the adjusting valve seat, so that the pressure regulating valve is suitable for different occasions.

Further, be equipped with the disk seat installation cavity on the valve body, be equipped with the operating portion on adjusting the disk seat, disk seat threaded connection just the operating portion protrusion in the disk seat installation cavity sets up.

The beneficial effects are that: the operating part protrudes out of the valve seat mounting cavity, so that the valve seat can be adjusted by screwing conveniently.

Furthermore, the pressure regulating valve for bridge plug setting also comprises an upper pressure spring seat and a lower pressure spring seat, the upper pressure spring seat and the lower pressure spring seat are both positioned in the pressure balancing cavity, the sliding core is fixed on the upper pressure spring seat and moves back and forth along the axial direction of the valve body along with the upper pressure spring seat, and the elastic element is a pressure spring positioned between the upper pressure spring seat and the lower pressure spring seat.

The beneficial effects are that: each part of the structure is arranged up and down, the whole assembly is simple, and the pressure spring is arranged between the upper pressure spring seat and the lower pressure spring seat, so that the installation of the pressure spring is facilitated.

Further, the communicating channel comprises a radial channel section and an axial channel section which are communicated with each other, one end, away from the axial channel section, of the radial channel section corresponds to the sliding core so as to communicate with the upper joint when the valve ball is opened, and one end, away from the radial channel section, of the axial channel section is communicated with the lower joint.

The beneficial effects are that: the pressure is conveniently transferred to the lower joint through the radial channel section and the axial channel section which are communicated with each other.

Furthermore, the pressure balance channel is arranged between the upper pressure spring seat and the lower pressure spring seat, the upper pressure spring seat is provided with a flow passage which is axially communicated with the valve body, and the flow passage is communicated with the upper side and the lower side of the upper pressure spring seat.

The beneficial effects are that: the part of the pressure balance cavity above the upper pressure spring seat is prevented from becoming a dead cavity.

Further, the lower pressure spring seat is in threaded connection with the pressure balance cavity.

The beneficial effects are that: so as to be convenient for the disassembly and assembly of the sliding core, the upper pressure spring seat and the pressure spring.

In order to achieve the purpose, the utility model discloses the technical scheme of bridging plug seat seal tubular column is:

bridge plug sits and seals tubular column, including oil pipe, be connected with bridge plug on the oil pipe and sit and seal instrument and bridge plug, bridge plug sits and seals the top that the instrument is in the bridge plug, still be connected with the air-vent valve on the oil pipe, the air-vent valve is in the top that the instrument was sat to the bridge plug, the air-vent valve includes:

a valve seat on the communication passage;

the pressure balance cavity is arranged in the valve body;

Drawings

Fig. 1 is a schematic structural view of a pressure regulating valve for setting a bridge plug according to an embodiment 1 of the present invention;

FIG. 2 is a schematic view of the adjusting nut of FIG. 1;

FIG. 3 is a schematic structural view of the slide core of FIG. 1;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

FIG. 5 is a schematic structural view of the upper compression spring seat in FIG. 1;

FIG. 6 is a bottom view of FIG. 5;

in the figure: 1-upper joint; 2-upper avoiding ring cavity; 3-a valve body; 4-lower avoiding annular cavity; 5-lower joint; 6-a communication channel; 7-valve seat; 8-a valve ball; 9-a sliding core; 10-a flow-through channel; 11-upper pressure spring seat; 12-a pressure balancing hole; 13-pressure spring; 14-lower pressure spring seat; 15-a first seal groove; 16-a first operating part; 17-sealing conical surface; 18-external threads; 19-a second seal groove; 20-axial grooves; 21-an arc-shaped recess; 22-fixed block; 23-fixing the groove; 24-upper limiting projection; 25-lower limit projection; 26-a second operating part; 27-a pressure balancing chamber; 28-pressure bearing face; 29-sealing the pin.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. Furthermore, the terms "upper" and "lower" are based on the orientation and positional relationship shown in the drawings and are only for convenience of description of the present invention, and do not indicate that the referred device or component must have a specific orientation, and thus, should not be construed as limiting the present invention.

The features and properties of the present invention are described in further detail below with reference to examples.

The utility model discloses embodiment 1 of air-vent valve for bridge plug setting:

as shown in fig. 1, the pressure regulating valve for bridge plug setting comprises a valve body 3, wherein the upper end of the valve body 3 is in threaded connection with an upper joint 1, the lower end of the valve body 3 is in threaded connection with a lower joint 5, and both the upper joint 1 and the lower joint 5 are of hollow structures; a communicating channel 6 is arranged in the valve body 3, and the communicating channel 6 is used for communicating the upper joint 1 and the lower joint 5.

In this embodiment, an eccentric pressure regulating channel is further arranged in the valve body 3, the eccentric pressure regulating channel is located between the upper joint 1 and the lower joint 5 and is communicated along the axial direction of the valve body 3, and the inner diameter of the eccentric pressure regulating channel is in a trend of expanding, reducing and expanding from top to bottom in sequence.

As shown in fig. 1 and 2, a valve seat 7 is arranged at the upper expanding part of the eccentric pressure regulating channel, the valve seat 7 is provided with a central hole, the central hole is designed with a drift diameter, such as a central hole, which is 2-4mm smaller than the diameter of the valve ball 8, the central hole is used as an oil pipe pressure transmission channel and forms a part of the communication channel 6, the lower part of the valve seat 7 is provided with a sealing conical surface 17, and the sealing conical surface 17 is used for being in sealing fit with the valve ball 8 to close the communication channel 6; the outer peripheral surface of the valve seat 7 is provided with an external thread 18, the valve seat 7 is an adjusting valve seat which is in threaded connection with the upper expanding part of the eccentric pressure adjusting channel, and the valve seat 7 adjusts the pre-compression amount of the pressure spring 13 by jacking the valve ball 8 and the sliding core 9; in this embodiment, the lower portion of the valve seat 7 is provided with two first seal grooves 15, and the two first seal grooves 15 are arranged along the axial direction of the valve seat 7, so that corresponding seal rings can be mounted, and the sealing performance between the valve seat 7 and the expanded portion of the upper portion is ensured. Wherein, the upper part expands the diameter to form a valve seat mounting cavity.

In the embodiment, the upper part of the valve seat 7 is provided with a first operating part 16, and the first operating part 16 protrudes out of the upper part and is arranged in an expanding way so as to facilitate the screwing and unscrewing of the valve seat 7; because the valve seat 7 is arranged eccentrically after the upper part is expanded, the lower part of the upper joint 1 is provided with an upper avoidance annular cavity 2 to avoid the interference of the upper joint 1 and the valve seat 7. Wherein the central hole of the valve seat 7 is communicated with the upper joint 1.

As shown in fig. 1 and 3, a sliding core 9 is assembled at the reduced diameter part in the middle of the eccentric pressure regulating channel in a sliding and sealing manner, the sliding core 9 is installed between the upper pressure spring seat 11 and the valve seat 7, a valve ball 8 is arranged between the sliding core 9 and the valve seat 7, and the valve ball 8 is matched with a sealing conical surface 17 of the valve seat 7 to realize the opening and closing of the communication channel 6.

In this embodiment, the middle of the sliding core 9 is provided with two second seal grooves 19, and the second seal grooves 19 are provided along the axial direction of the sliding core 9, so as to mount a seal ring, thereby ensuring the sealing performance of the sliding core 9 in the sliding process. Wherein, sealing washer and seal groove constitute seal structure jointly.

As shown in fig. 3, an arc-shaped concave portion 21 is provided at the upper end of the slide core 9, the arc-shaped concave portion 21 has a valve ball bearing surface adapted to the valve ball 8, the valve ball bearing surface is used for bearing the valve ball 8, and the valve ball bearing surface can ensure that the valve ball 8 is stable and centered during the movement of the valve ball 8 along with the slide core 9; the outer peripheral surface of the upper part of the sliding core 9 is provided with an axial groove 20, the axial groove 20 is used for liquid throttling and pressure transmission, so that the sliding core 9 repeatedly vibrates and surges in the axial direction of the valve body 3 to slow down the instant release of pressure and ensure that the liquid inlet is smooth; the axial groove 20 extends in the axial direction of the slide core 9, the upper portion of the axial groove 20 extends to the spherical recess 21, and the lower portion of the axial groove 20 is above the seal structure.

As shown in fig. 4, four axial grooves 20 are provided along the circumferential direction of the slide core 9, and the slide core 9 is provided with an annular gap above the seal structure, the annular gap being an assembly gap, the annular gap communicating with the four axial grooves 20, wherein the annular gap has a smaller size in the radial direction of the slide core 9. Wherein the four axial grooves 20 and the annular gap together form a throttling gap. In other embodiments, the number of axial grooves is set as desired.

In this embodiment, a pressure bearing surface 28 is provided below the sealing structure, and when the sealing structure is subjected to formation pressure, the pressure bearing surface 28 bears pressure to generate upward thrust.

As shown in fig. 1, an elastic support mechanism is arranged at the lower expanding position of the eccentric pressure regulating channel, the elastic support mechanism comprises an upper pressure spring seat 11, a pressure spring 13 and a lower pressure spring seat 14, the pressure spring 13 is arranged between the upper pressure spring seat 11 and the lower pressure spring seat 14, and the lower expanding position is a pressure balance cavity 27 in the embodiment; in this embodiment, the upper pressure spring seat 11 is slidably assembled on the upper portion of the pressure balance cavity 27, the lower pressure spring seat 14 is connected to the valve body 3 in a threaded manner so as to be installed on the lower portion of the pressure balance cavity 27, and a sealing ring is arranged between the lower pressure spring seat 14 and the valve body 3 so as to ensure the sealing property of the lower portion of the pressure balance cavity. Wherein the pressure spring 13 constitutes an elastic element.

As shown in fig. 2 and 5, a fixing block 22 is disposed at the lower end of the sliding core 9, a fixing groove 23 is disposed at the upper portion of the upper pressure spring seat 11, and the fixing block 22 is fixedly mounted in the fixing groove 23 to fixedly connect the sliding core 9 and the upper pressure spring seat 11, so that the sliding core 9 and the upper pressure spring seat 11 reciprocate in the axial direction of the valve body 3 together.

In this embodiment, in order to facilitate the installation of the upper pressure spring seat 11 into the pressure balance cavity 27, a tapered chamfer is provided at the upper end of the upper pressure spring seat 11 to function like a guide shoe, and preferably, the angle of the tapered chamfer is 30 °.

As shown in fig. 1 and 5, the lower end of the upper spring seat 11 is provided with an upper limiting protrusion 24, the upper end of the lower spring seat 14 is provided with a lower limiting protrusion 25, the upper end of the pressure spring 13 is sleeved on the upper limiting protrusion 24, and the lower end of the pressure spring 13 is sleeved on the lower limiting protrusion 25, so as to ensure the stability of the pressure spring 13 in the stretching process.

As shown in fig. 1, the lower end of the lower pressure spring seat 14 is provided with a second operating portion 26, and the second operating portion 26 protrudes out of the lower end of the valve body 3, so that the lower pressure spring seat 14 can be conveniently detached; the upper part of the lower joint 5 is provided with a lower avoidance annular cavity 4, and the lower avoidance annular cavity 4 is used for avoiding the second operation part 26 so as to avoid the interference between the second operation part 26 and the lower joint.

As shown in fig. 1, a pressure balance hole 12 is formed in the valve body 3, the pressure balance hole 12 is located between the upper pressure spring seat 11 and the lower pressure spring seat 14, and the pressure balance hole 12 communicates with the outside of the valve body 3 and a pressure balance cavity 27 to transmit formation pressure to the pressure balance cavity 27, wherein the pressure balance hole 12 forms a pressure balance channel.

As shown in fig. 5 and 6, the upper pressure spring seat 11 is provided with a flow passage 10, and the flow passage 10 extends in the axial direction of the valve body 3, so that the formation pressure entering the pressure balance cavity 27 is transmitted to the pressure bearing surface 28, and the part of the pressure balance cavity 27 above the upper pressure spring seat 11 is prevented from becoming a dead space. In this embodiment, four flow-passing channels 10 are uniformly distributed along the axial direction of the upper pressure spring seat 11 at intervals, and the flow-passing channels 10 are in a groove structure.

As shown in fig. 1, the communication channel 6 includes a radial channel section and an axial channel section which are arranged on the valve body 3, the radial channel section is communicated with the axial channel section and is perpendicular to the axial channel section, the radial channel section is arranged corresponding to the axial groove 20, and one end of the radial channel section, which is far away from the axial channel section, is communicated with the axial groove 20; one end of the axial channel section, which is far away from the radial channel section, is communicated with the lower joint.

In this embodiment, the radial passage section is formed by machining the outer circumferential surface of the valve body 3 inward by a drilling tool, and therefore, one end of the radial passage section near the outer circumferential surface of the valve body 3 is sealed by a seal pin 29 with a seal ring.

The working principle of the pressure regulating valve of the embodiment is as follows: when the pressure regulating valve works underground, formation pressure firstly enters a pressure balance cavity 27 through a pressure balance hole 12, then is transmitted to a pressure bearing surface 28 of the sliding core 9 through the flow passage 10, and then acts on the valve ball 8 through the sliding core 9, so that the valve ball 8 is acted upwards. According to the force balance principle, the balance force required at the upper part of the valve ball 8 is equal to the formation pressure multiplied by (the cross-sectional area at the seal of the sliding core 9 divided by the cross-sectional area at the seal of the valve ball 8). The pressure regulating valve can design that the ratio of the sectional area of the sealing part of the sliding core 9 to the sectional area of the sealing part of the valve ball 8 is more than 1 according to the requirement of gas well stratum pressure balance, so that the balance force of the upper part of the valve ball 8 is larger than the stratum pressure, and the stratum pressure plays a role in balancing the pressure of a liquid column on the upper part of an oil pipe.

Before the pressure regulating valve is used, the ratio of the sectional area of the sealing part of the sliding core 9 to the sectional area of the sealing part of the valve ball 8 is designed according to the stratum pressure condition of a single well, so that the underground pressure is amplified, and the effect of balancing the pressure of a liquid column of an oil pipe by the pressure regulating valve is achieved.

When the pressure regulating valve works in a well, the bridge plug setting tool is connected above the bridge plug, then the setting ball is put into the bridge plug setting tool, and finally the pressure regulating valve is connected above the bridge plug setting tool. In the running process of the tubular column, the oil pipe does not need to be filled with liquid, the pressure of the liquid column is 0MPa at the moment, the elastic supporting mechanism is in a slight compression state, the pressure spring 13 is elastically supported on the upper pressure spring seat 11, so that the valve ball 8 on the sliding core 9 is always in sealing fit with the sealing conical surface 17 on the valve seat 7, wherein the elastic action of the pressure spring 13 is not large, and the valve ball 8 is only ensured to be always in sealing fit with the sealing conical surface 17 on the valve seat 7 before the tubular column enters the liquid in the shaft. After the pipe column enters the shaft liquid, the formation pressure is transmitted into the balance cavity 27 through the pressure balance hole 12 and acts on the bearing surface 28 of the sliding core 9 through the flow passage 10, and an upward thrust is generated on the sliding core 9 to push the valve ball 8 to keep sealing all the time.

After the pipe column is lowered to the designed depth, firstly, slowly filling liquid into the oil pipe until the liquid level rises to a well head, then slowly pressurizing, after the pressure of the ground pump plus the pressure of the liquid column is greater than the starting pressure of the pressure regulating valve, namely, the pressure of the ground pump plus the pressure of the liquid column is greater than the pressure of the ground pump plus the pressure of the stratum multiplied by (the sectional area of the sealing part of the sliding core 9 is divided by the sectional area of the sealing part of the valve ball 8), the ground pump pushes the valve ball 8, the sliding core 9, the upper pressure spring sleeve 11 and the spring 13 to move downwards, the communication channel 6 is opened, the low-speed high-pressure fluid can be instantly decompressed, the pressure drop of the fluid is reduced after the fluid passes through the annular gap and the axial groove 20, then the fluid moves to the lower joint 5 through; after the low-speed high-pressure fluid communication channel 6 is opened for pressure relief, the sliding core 9 can ascend again under the combined action of elastic acting force and formation pressure to close the communication channel 6, the ground pump pressure is continuously pressed, the sliding core 9 can be opened again, and the sliding core 9 repeatedly executes the action underground to play a role in slow transmission of the pump pressure so as to realize setting of the bridge plug. In the working process of the sliding core 9, the opening pressure of the sliding core 9 plays a role of balancing the liquid column pressure of the oil pipe all the time, so that the pressure transmitted to the lower bridge plug setting tool is close to the ground pump pressure all the time, and the setting pressure of the bridge plug in the well is controlled by observing the ground pump pressure in real time. The stable transmission of the pressure is kept through the slow pressing of the ground pump truck and the repeated vibration and surging of the sliding core 9. During construction, the condition can be displayed according to the ground pressure, the small-displacement pump injects and pressurizes, and a series of actions of opening the pressure regulating valve, setting the bridge plug and releasing the bridge plug are realized. After the construction is finished, the oil pipe is decompressed, the upper pressure spring seat 11 and the sliding core 9 push the valve ball 8 to move upwards under the action of the elastic acting force of the pressure spring 13 and the stratum pressure, the valve ball 8 and the sealing conical surface 17 on the valve seat 7 form sealing again, the communicating channel 6 is closed, and the construction of the pipe column is finished.

The utility model discloses bridge plug sets up and seals embodiment 2 with air-vent valve:

in embodiment 1, the sliding core 9 is provided with an axial groove 20, and the axial groove 20 is used for liquid throttling and pressure transmission, so that the sliding core 9 repeatedly vibrates and vibrates in the axial direction of the valve body 3 to slow down the instant release of pressure.

The utility model discloses embodiment 3 of air-vent valve for bridge plug setting:

in embodiment 1, the axial groove 20 extends in the axial direction of the sliding core 9, and the axial groove 20 is disposed corresponding to the radial passage section to send the liquid into the radial passage section when the valve ball is opened.

The utility model discloses embodiment 4 of air-vent valve for bridge plug setting:

in the embodiment 1, the valve seat 7 is in threaded connection with the valve body 3 to adjust the precompression amount of the pressure spring 13, so that the valve is suitable for different well depths; in this embodiment, for the bridge plug setting of single well depth, disk seat integrated into one piece does not need the precompression volume of readjustment pressure spring on the valve body.

The utility model discloses embodiment 5 of air-vent valve for bridge plug setting:

in embodiment 1, the elastic member is a compression spring 13, and the compression spring 13 is disposed between the upper compression spring seat 11 and the lower compression spring seat 14 to apply an upward elastic acting force to the upper compression spring seat 11.

The utility model discloses embodiment 6 of air-vent valve for bridge plug setting:

in embodiment 1, the elastic member is a compression spring 13, and the compression spring 13 is disposed between the upper compression spring seat 11 and the lower compression spring seat 14 to apply an upward elastic force to the upper compression spring seat 11.

The utility model discloses embodiment 7 of air-vent valve for bridge plug setting:

in embodiment 1, the sliding core 9 is provided with the axial groove 20, and the axial groove 20 forms a part of the throttling gap.

The utility model discloses the embodiment of bridge plug seat seal tubular column, the bridge plug seat seal tubular column in this embodiment includes that bridge plug sits and seals instrument and bridge plug, and bridge plug sits and seals the top that the instrument is in the bridge plug, and bridge plug sits and seals the top of instrument and be equipped with the air-vent valve, and this air-vent valve sits with above-mentioned bridge plug and seals with arbitrary in embodiment 1 to 7 of air-vent valve the structure the same, no longer gives unnecessary details here.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. Pressure regulating valve for bridge plug setting, its characterized in that includes:

a valve seat on the communication passage;

the pressure balance cavity is arranged in the valve body;

2. The pressure regulating valve for setting the bridge plug according to claim 1, wherein the valve body is provided with a cavity, the sliding core is assembled in the cavity in a sliding and sealing manner, an assembly gap is reserved between the sliding core and the wall of the cavity, the assembly gap forms a throttling gap, and the throttling gap is the throttling structure.

3. The pressure regulating valve for setting the bridge plug according to claim 2, wherein the outer peripheral surface of the sliding core is provided with two or more axial grooves at intervals along the circumferential direction of the sliding core, and each axial groove extends along the axial direction of the sliding core.

4. The pressure regulating valve for bridge plug setting according to claim 1, 2 or 3, wherein said valve seat is a regulating valve seat screwed on the valve body, and the regulating valve seat regulates the precompression amount of said elastic member by pressing the valve ball and the sliding core.

5. The pressure regulating valve for bridge plug setting according to claim 4, characterized in that a valve seat installation cavity is arranged on the valve body, an operation part is arranged on the regulating valve seat, the valve seat is in threaded connection in the valve seat installation cavity, and the operation part is arranged to protrude out of the valve seat installation cavity.

6. The pressure regulating valve for bridge plug setting according to claim 1, 2 or 3, further comprising an upper pressure spring seat and a lower pressure spring seat, wherein the upper pressure spring seat and the lower pressure spring seat are both located in the pressure balancing cavity, the sliding core is fixed on the upper pressure spring seat and reciprocates along the axial direction of the valve body together with the upper pressure spring seat, and the elastic member is a pressure spring located between the upper pressure spring seat and the lower pressure spring seat.

7. The pressure regulating valve for setting a bridge plug according to claim 6, wherein said communication channel comprises a radial channel section and an axial channel section which are communicated with each other, one end of the radial channel section away from the axial channel section corresponds to said sliding core to communicate with the upper joint when the valve ball is opened, and one end of the axial channel section away from the radial channel section is communicated with the lower joint.

8. The pressure regulating valve for bridge plug setting according to claim 6, characterized in that the pressure balancing channel is located between the upper pressure spring seat and the lower pressure spring seat, the upper pressure spring seat is provided with a flow passage which penetrates along the axial direction of the valve body, and the flow passage communicates the upper side and the lower side of the upper pressure spring seat.

9. The pressure regulating valve for setting a bridge plug according to claim 6, wherein said lower pressure spring seat is threaded into a pressure balancing cavity.

10. The bridge plug setting pipe column comprises an oil pipe, wherein a bridge plug setting tool and a bridge plug are connected to the oil pipe, and the bridge plug setting tool is located above the bridge plug, and the bridge plug setting pipe column is characterized in that the oil pipe is also connected with a pressure regulating valve which is located above the bridge plug setting tool and is the pressure regulating valve according to any one of claims 1 to 9.