CN207406313U - A kind of annular pressure downhole control valve - Google Patents

Abstract

The utility model discloses an annulus pressure downhole control valve, which belongs to the technical field of oil and gas well engineering and is designed for solving abnormal annulus pressure in oil and gas wells. The hoop cooperates with the outer cylinder to form a first accommodating chamber and a second accommodating chamber, the first accommodating chamber communicates with the casing, and the second accommodating chamber communicates with the first accommodating chamber and the casing respectively. The outside communicates to form a one-way communication channel; a valve core is arranged in the second accommodation cavity, and the valve core can move along the inner wall of the second accommodation cavity to open or close the one-way communication channel. The annulus downhole pressure control valve provided by the utility model can alleviate the abnormal annulus pressure in oil and gas well completion and production engineering, ensure the integrity of the wellbore and production safety, and has a simple structure and low processing cost, and can effectively reduce the pressure of the annulus. The cost of pressure control.

Description

An annular pressure downhole control valve

technical field

The utility model relates to the technical field of oil and gas well engineering, in particular to an annular pressure downhole control valve.

Background technique

During the drilling and completion process, in order to separate different geological formations and prevent the well wall from collapsing due to different geological formations, one or more layers of casing are required for cementing, and the annular space between the casings that is not cemented is formed. The annular space is filled with liquids of different properties. In the production process of oil or natural gas, etc., the radial heat transfer of the circulating fluid in the well will cause the thermal expansion of the annular fluid and the casing string, which will cause the expansion and pressurization of the annular fluid, resulting in abnormal annular pressure. With the deepening of exploration and development of high temperature and high pressure oil and gas wells and deep water oil and gas wells, the abnormal annular pressure in the wellbore of oil and gas wells has become more and more prominent. Abnormal annular pressure in the wellbore increases the load of the wellbore string, and under high annular pressure loads, dangerous accidents such as yield failure, buckling, and collapse may occur in the casing, affecting the normal production of oil and gas wells. Once the abnormal annular pressure causes the downhole casing string to fail in service, the oil and gas well will have to be shut down for workover, and in severe cases, the gas in the wellbore will continuously escape from the annular space and leak into the atmosphere. Abnormal annular pressure during the drilling phase may cause the casing string to collapse, leading to serious consequences such as wellbore scrapping. Onshore oil and gas wells can install pressure relief valves at the wellheads, and by manually opening the pressure relief valves to reduce the annular pressure, the safety of the wellbore can be maintained. For offshore oil and gas wells, due to the limitation of the underwater wellhead structure, pressure relief valves cannot be installed at the wellhead and casing hangers. Once the annular fluid is pressurized, it will be completely trapped in the wellbore, which will have a major impact on production continuity and production safety. .

The prior art provides a deep-water casing high-pressure spring pressure relief valve, which includes a valve body with a circumferential passage inside, a ball seat and a spring seat. The inner cavity of the valve is connected, the ball seat is arranged on the axial channel and the inside is connected with the axial channel and the inner cavity of the valve respectively, the spring seat is arranged in the inner cavity of the valve relative to the ball seat and its inner part is respectively connected with the axial channel and the inner cavity of the valve body cavities connected.

The above deep-water casing high-pressure spring pressure relief valve is suitable for adjusting the pressure in the inner annular space of a single casing because it uses external threads to connect with the casing inner wall to control the pressure on both sides of the casing, but for the pressure between multiple casings Adjustment cannot be applied. However, measures commonly used in engineering applications, such as returning the annular cement to the wellhead and adding compressible liquid in the sealed annulus, will bring corresponding increases in drilling costs and difficulties in construction operations.

Utility model content

The utility model provides an annulus pressure downhole control valve, which can automatically reduce the abnormal pressure of the wellbore annulus, and at the same time makes the annulus pressure downhole control valve easy to process, manufacture, construct and install.

In order to achieve the above object, the utility model adopts the following technical solutions:

A downhole control valve for annulus pressure, comprising a collar and an outer cylinder mated with the collar, the collar and the outer cylinder cooperate to form a first accommodation chamber and a second accommodation chamber, the first The accommodating chamber communicates with the sleeve, and the second accommodating chamber communicates with the first accommodating chamber and the outside of the sleeve respectively to form a one-way communication channel;

A spool is arranged in the second accommodating chamber, and the spool can move along the inner wall of the second accommodating chamber to open or close the one-way communication channel.

Preferably, the inner cavity of the collar is the first receiving cavity, and both ends of the inner cavity of the collar are provided with threads for connecting the casing. This setting can avoid the thread for connecting the casing on both the coupling and the sleeve, reduces the complexity of processing the coupling and casing, and avoids the trouble of thread damage affecting both the coupling and the outer cylinder.

Preferably, the coupling is provided with a drain hole communicating with the inner cavity of the coupling, and the outer cylinder is provided with a piston cavity communicating with the inner cavity of the outer cylinder and a liquid inlet hole communicating with the piston cavity. The liquid hole is also communicated with the outside of the sleeve; when the collar is connected to the outer cylinder, the liquid discharge hole, the piston chamber and the liquid inlet hole are connected in sequence to form the one-way flow channel .

Preferably, the spool includes a spring seat, a piston body and a push rod connected in sequence, the outer diameter of the piston body is larger than the outer diameter of the push rod and the outer diameter of the spring seat, and the outer diameter of the piston body The outer wall is axially provided with a guide groove; the piston body is located in the piston chamber and can move along the inner wall of the piston chamber; the outer diameter of the ejector rod matches the inner diameter of the liquid inlet hole, and The push rod can move along the inner wall of the liquid inlet hole. This type of spool has a simple structure. When the external fluid pushes the ejector rod to move the ejector rod along the liquid inlet hole, and the piston body moves along the piston chamber, the liquid inlet hole, piston chamber, liquid guide groove and liquid discharge hole can be made Conduction, that is, the one-way fluid channel conduction, so that the external high-pressure fluid flows into the casing, reducing the pressure difference between the inner and outer rings of the casing.

Preferably, a spring is sleeved on the spring seat, one end of the spring abuts against the surface connecting the piston body and the spring seat, and the other end abuts against the outer surface of the collar. The spring cooperates with the movement of the spool, which can better realize the automatic opening and closing of the one-way flow channel, that is, when the force of the internal and external fluid pressure difference on the spool is greater than the elastic force of the spring, the one-way flow channel opens, and when the internal and external fluid pressure When the force differential to the spool is less than the return force of the spring, the spring will return to its original position and the one-way flow channel will be closed. The principle is simple and the operation is easy, which avoids the complexity caused by setting other control drive mechanisms that control the movement of the drive spool. It can be better applied to the environment of deep sea or high pressure and high temperature oil and gas wells.

Preferably, there are multiple liquid guide grooves, and the multiple liquid guide grooves are evenly distributed along the circumference of the piston body. The arrangement of multiple liquid guide grooves can increase the conduction path in the piston cavity and accelerate the relief of the internal and external pressure difference.

Preferably, the end of the piston chamber connected to the liquid inlet hole is a tapered surface, and the part of the piston body connected to the ejector rod is a tapered step matched with the tapered surface. When the one-way flow passage is closed, due to the elastic force of the spring, the tapered step of the valve core fits closely with the tapered surface of the piston cavity to form a seal to prevent internal and external fluid circulation.

Preferably, the collar is provided with a blind hole communicating with the piston cavity, and one end of the spring seat is placed in the blind hole and can move along the inner wall of the blind hole; The drain hole and the pressure transmission hole of the blind hole. During the movement of the spool, the setting of the blind hole can guide the movement of the spool to avoid the movement of the spool being unstable under the action of the fluid and causing damage to the spool. At the same time, the setting of the pressure transmission hole avoids the dead space formed by the blind hole, so that during the movement of the valve core, the pressure of the fluid in the blind hole changes due to the push-in or push-out movement of the spring seat, which affects the movement of the valve core. resistance.

Preferably, a first annular step and a second annular step are provided on the wall of the coupling tube, one end of the spring abuts against the step surface of the first annular step, and the step surface of the second annular step abut against the end face of the outer cylinder. The first annular step and the second annular step are provided on the pipe wall of the collar, so that the matching and positioning of the collar and the sleeve can be more accurate.

Preferably, the collar and the outer cylinder are connected and sealed by welding or riveting.

The beneficial effects of the utility model are:

The annular pressure downhole control valve provided by the utility model opens or closes the one-way flow channel when the pressure difference inside and outside the casing exceeds a certain value, so that the external high-pressure fluid is discharged into the inside of the casing, so as to reduce the abnormal pressure of the annular space and reduce the The axial load brought by the pressure difference between the inner and outer annular air of the small casing improves the service life and safety performance of the casing;

The annulus pressure downhole control valve provided by the utility model can be installed on any layer or multi-layer casing, so as to relieve the abnormal pressure of each layer of annulus, effectively ensure the safety performance of each layer of casing, and keep the wellbore intact Sexuality, to avoid the shutdown of production work caused by the damage of one or more layers of casing;

The annular space pressure downhole control valve provided by the utility model has the advantages of simple structure, low processing cost, convenient installation and construction procedures, and can effectively reduce the cost of annular space pressure control.

Description of drawings

Fig. 1 is a schematic diagram of the connection between the annular pressure downhole control valve and the casing provided by the utility model;

Fig. 2 is a structural schematic diagram of the annular pressure downhole control valve provided by the utility model;

Fig. 3 is the partial enlarged view of I place in Fig. 2;

Fig. 4 is a schematic diagram of the coupling structure provided by the utility model;

Fig. 5 is a schematic diagram of the structure of the outer cylinder provided by the utility model;

Fig. 6 is a schematic structural view of the valve core provided by the present invention.

The markings in the figure are as follows:

1-coupling; 11-coupling inner cavity; 12-coupling pipe wall; 121-first pipe wall; 122-second pipe wall; 123-third pipe wall; 13-drain hole; 14-blind hole ; 15-the first annular step; 16-the second annular step; 17-thread;

2-outer cylinder; 21-inner cavity of outer cylinder; 22-outer tube wall; 221-fourth tube wall; 222-fifth tube wall; 23-inlet hole; 24-piston cavity; 25-third annular step ;

3-spool; 31-rod; 32-piston body; 321-conical step; 322-guiding groove; 33-spring seat; 331-pressure hole;

4-spring; 5-sleeve.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail. It can be understood that the specific embodiments described here are only used to explain the utility model, rather than limit the utility model. In addition, it should be noted that, for the convenience of description, only some structures related to the present utility model are shown in the drawings but not all structures.

As shown in Figure 1, the utility model provides an annulus pressure downhole control valve, which includes a coupling 1 and an outer cylinder 2 that is connected with the coupling 1, and the coupling 1 and the outer cylinder 2 cooperate to form a first accommodating chamber and the second accommodating cavity, the first accommodating cavity communicates with the sleeve 5, and the second accommodating cavity respectively communicates with the outside of the first accommodating cavity and the sleeve 5 to form a one-way flow channel; a valve core 3 is arranged inside the second accommodating cavity, The valve core 3 can move along the inner wall of the second accommodating chamber to open or close the one-way communication channel.

Specifically, as shown in Figures 2-5, both the coupling 1 and the outer cylinder 2 are cylindrical structures with an inner cavity, and the outer wall of the coupling pipe wall 12 is provided with a first annular step 15 for matching with the outer cylinder 2 and The second annular step 16. One end of the coupling 1 extends into the inner cavity 21 of the outer cylinder, and is connected with the inner cavity 21 of the outer cylinder, and the step surface of the second annular step 16 abuts against one end surface of the outer cylinder 2, and the coupling 1 and the outer cylinder 2 It is connected and sealed by welding or riveting. The coupling 1 and the outer cylinder 2 can adopt other structures and connection forms. For example, the coupling 1 and the outer cylinder 2 can be a cylindrical structure with the same cavity diameter, and the two ends are connected by welding or riveting, etc., but the above-mentioned The way of connecting the collar 1 and the outer cylinder 2 with the annular step and welding can improve the reliability of the connection, make the connection between the collar 1 and the outer cylinder 2 tighter, and prevent the weld seam from connecting the inner cavity and the outer cylinder of the downhole control valve. Externally, the pressure difference between the inside and outside of the downhole control valve can prevent the welding seam from deforming and cracking, thereby causing fluid leakage in the casing 5 and affecting the performance of the downhole control valve and casing 5 . At the same time, in the above structure, the inner cavity 11 of the collar is the first receiving cavity, and the two ends of the inner cavity 11 of the collar are provided with threads 17 for connecting the casing 5, which avoids the problem of providing threads on both the outer cylinder 2 and the collar 1. Trouble, simplify processing.

As shown in Figure 4, the first annular step 15 and the second annular step 16 divide the coupling pipe wall 12 into three parts, the first pipe wall 121, the second pipe wall 122 and the third pipe wall 123 with different pipe wall outer diameters. , and the first tube wall 121 and the second tube wall 122 are located in the inner cavity 21 of the outer cylinder. A drain hole 13 is opened on the first pipe wall 121, and the drain hole 13 is respectively connected to the outside of the coupling 1 and the part of the cavity of the coupling inner cavity 11 that is not connected to the casing 5. The drain hole 13 can be cylindrical or rectangular. Or other shapes, but preferably a cylindrical hole, and the axis of the drain hole 13 is perpendicular to the axis of the collar 1, so as to facilitate the processing of the drain hole 13. A blind hole 14 is opened on the second pipe wall 122, and one end surface of the blind hole 14 is located on the step surface of the first annular step 15, the blind hole 14 can be a cylindrical hole, and the axis of the blind hole 14 is parallel to the coupling 1 axis.

As shown in Figure 5, a third annular step 25 is provided on the inner wall of the inner chamber 21 of the outer tube, and the third annular step 25 divides the outer tube wall 22 into a fourth tube wall 221 and a fifth tube wall with different inner diameters. 222 , the fourth tube wall 221 is provided with a piston chamber 24 and a liquid inlet hole 23 communicating with the piston chamber 24 , wherein the piston chamber 24 communicates with the inner cavity 21 of the outer cylinder, and the liquid inlet hole 23 communicates with the outside of the outer cylinder 2 . The shapes of the piston chamber 24 and the liquid inlet hole 23 can be cylindrical, rectangular or other shapes, and are all preferably cylindrical, and the axes of the piston chamber 24 and the liquid inlet hole 23 are all parallel to the axis of the outer cylinder 2, so that the piston cavity 24 and liquid inlet hole 23, while preventing external fluid from flowing in through the liquid inlet hole 23 and piston chamber 24, the inclined flow channel causes the fluid pressure to produce radial pressure on the outer cylinder 2, increasing the outer cylinder 2 or casing 5 radial loads.

When the coupling 1 and the outer cylinder 2 are mated and connected, the liquid discharge hole 13, the piston chamber 24 and the liquid inlet hole 23 are connected in sequence, so that the inner chamber of the downhole control valve communicates with the outside to form a one-way flow channel. The valve core 3 is disposed in the piston cavity 24 and can move along the inner wall of the piston cavity 24 . As shown in Figure 6, the valve body can be divided into a push rod 31, a piston body 32 and a spring seat 33 which are connected in sequence, wherein the push rod 31 can be connected with the drain hole 13, and the outer diameter of the piston body 32 and the piston cavity The apertures of 24 match and the spring seat 33 can be connected with the blind hole 14. In order to ensure the vertical movement of the spool 3, the axis of the blind hole 14, the axis of the piston cavity 24 and the axis of the inlet hole 23 are on the same straight line. Because one end of the spring seat 33 is located in the blind hole 14, in order to avoid the vertical movement of the spool 3, the blind hole 14 forms a dead space, and the fluid compression in the blind hole 14 produces greater resistance to the movement of the spool 3, and the upper end of the spring seat 33 A pressure transmission hole 331 communicating with the blind hole 14 and the drain hole 13 is provided.

In order to realize the one-way conduction of the flow channel, the diameter of the piston chamber 24 is larger than that of the liquid inlet hole 23, and the piston chamber 24 and the liquid inlet hole 23 are connected by a tapered surface. Correspondingly, the outer diameter of the piston body 32 is larger than that of the ejector rod 31 and the outer diameter of the spring seat 33, and the part where the piston body 32 is connected with the push rod 31 is a conical step 321 matched with the conical surface; It is rectangular or other shapes. In order to better realize the conduction function of the flow channel and reduce the pressure difference between the inside and outside of the casing 5 relatively quickly, multiple liquid guide grooves 322 can be opened, and multiple liquid guide grooves 322 can be opened along the piston body 32. Evenly distributed in the circumferential direction, so as to prevent uneven force on the valve core 3 caused by the fluid flowing through the valve core 3 after the flow channel is conducted.

In order to realize the one-way conduction of the circulation channel under certain conditions, a spring 4 is sleeved on the spring seat 33. One end of the spring 4 abuts against the stepped surface formed by the piston body 32 and the spring seat 33, and the other end abuts against the wall of the collar pipe. 12 on the step surface of the first annular step 15. When the internal and external pressure of the downhole control valve is balanced, the spring 4 is in a slightly compressed state, and the elastic force of the spring 4 reacts on the valve core 3 to give the valve core 3 a pressure to press the outer cylinder 2, so that the cone of the valve core 3 The step 321 is in close contact with the tapered surface of the piston cavity 24 to achieve a metal sealing effect. At this time, the flow channel is closed. When the external annulus is abnormal, the external fluid pressure of the downhole control valve increases, and the fluid pressure acts on the ejector rod 31 of the valve core 3 through the liquid inlet hole 23. When the force is greater than the elastic force of the spring 4, the fluid pressure pushes the valve core 3 Move, so that the ejector rod 31 slides out of the liquid inlet hole 23. Since the liquid guide groove 322 is provided on the piston body 32, the liquid inlet hole 23, the liquid guide groove 322, the piston chamber 24 and the liquid discharge hole 13 are connected to each other, and the annular space The external fluid enters the sleeve 5 along the inlet hole 23, the guide groove 322, the piston chamber 24 and the drain hole 13, and the pressure difference between the inside and outside of the sleeve 5 decreases. , under the restoring force of the spring 4, the spool 3 moves along the piston cavity 24, the ejector rod 31 slides into the liquid inlet hole 23, and the flow channel is closed.

In addition to using the spring 4, other methods can be adopted to move the valve core 3 in the piston chamber 24 to open or close the flow channel. For example, a pressure detection device can be used to detect the pressure of the inner and outer annular spaces. The control mechanism controls the movement of the spool 3 to open or close the flow channel according to the signal detected by the pressure detection device. However, the above-mentioned spring 4 is used to move or reset the valve core 3, so that the principle of the whole device is simple, easy to operate, and the structure of the entire annulus downhole pressure control valve can be simplified, and the movement of the spring 4 can be adjusted according to the pressure difference between the inner and outer annulus. It is carried out automatically, without additional driving by a detection device or a driving device, and the automatic effect is good.

The structures such as the drain hole 13, the liquid inlet hole 23, the piston chamber 24, the valve core 3 and the spring 4 can be arranged in multiples correspondingly, such as setting up a plurality of drain holes 23 and Blind hole 14, a plurality of liquid inlet holes 23 and piston chambers 24 are opened on the outer cylinder 2, and a valve core 3 and a spring 4 are arranged in each piston chamber 24 to form a plurality of the above-mentioned The one-way flow channel can quickly relieve the abnormal annular pressure outside the casing.

The connection mode of the above annular pressure downhole control valve is as follows:

(1) The valve core 3 is loaded into the piston chamber 24 of the outer cylinder 2, so that the tapered step 321 of the valve core 3 is in contact with the tapered surface of the piston chamber 24;

(2) Spring 4 is sleeved on the spring seat 33 of spool 3;

(3) Install the outer cylinder 2 from the lower end of the coupling 1, align the valve core 3 with the blind hole 14 of the coupling 1, push the outer cylinder 2 up against the second annular step 16 of the coupling 1, and make the valve core 3 Entering the blind hole 14 of the coupling 1, the spring 4 is compressed, pushing the valve core 3 and the conical surface of the piston cavity 24 to form a metal seal;

(4) Weld the outer cylinder 2 and the collar 1, or fasten the outer cylinder 2 and the collar 1 with screws, so that the piston chamber 24 is isolated and sealed from the outside.

The installation and working process of the above annular downhole pressure control valve in the wellbore are as follows:

(1) Connect the upper and lower ends of the annulus downhole pressure control valve to the casing 5 respectively;

(2) Running the casing 5 connected with the annular downhole pressure control valve into the oil and gas well, injecting cement into the annulus outside the downhole control valve and cementing the well, and the cement surface is lower than the lower end surface of the downhole control valve;

(3) In the production of oil and gas wells, the radial heat transfer of the wellbore causes pressurization of the pipe string in the oil and gas well. When the external fluid pressure is high and the internal fluid pressure is high, the fluid pressure acts on the valve core 3, and the pressure difference gives the valve core 3 a certain thrust, pushing the valve The core 3 presses the compression spring 4 upward;

(4) When the pressure difference is greater than a certain value, the ejector rod 31 of the valve core 3 slides out of the liquid inlet hole 23. At this time, the one-way flow channel is conducted, and the fluid outside the annular space passes through the liquid inlet hole 23, the piston chamber 24, The liquid guide groove 322 and the liquid discharge hole 13 enter the inner annulus, and the pressure difference between the inner and outer annulus decreases;

(5) When the pressure difference between the inner and outer rings decreases to a certain value, the spring 4 is reset, and the one-way circulation channel is closed.

The annulus downhole pressure control valve provided by the utility model can automatically open or close the one-way flow passage according to the pressure difference between the inner and outer annular spaces of the casing 5, and can effectively slow down the pressure difference between the inside and outside of the casing 5 and the pressure difference due to the annular pressure difference. The resulting axial load improves the performance of the casing 5 and is beneficial to maintaining the integrity of the wellbore and the continuity of oil and gas well production. At the same time, the annular pressure downhole control valve has simple structure, low processing cost, and convenient installation and construction, which can effectively reduce the cost of installing pressure control devices in oil and gas wells.

Note that the above are only preferred embodiments of the present invention and the applied technical principles. Those skilled in the art will understand that the utility model is not limited to the specific embodiments described here, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the utility model. Therefore, although the utility model has been described in detail through the above embodiments, the utility model is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the utility model. The scope of the present invention is determined by the appended claims.

Claims (10)

1. a kind of annular pressure downhole control valve, which is characterized in that be connected including box cupling (1) and with the box cupling (1) Outer barrel (2), the box cupling (1) and the outer barrel (2) have cooperatively formed the first accommodating chamber and the second accommodating chamber, and described first accommodates Chamber is connected with casing (5), and second accommodating chamber is connected with first accommodating chamber and the external of described sleeve pipe (5) with shape respectively Into one-way flow passage；

Spool (3) is provided in second accommodating chamber, the spool (3) can move along the described second receiving cavity wall, to open Open or close the one-way flow passage.

2. annular pressure downhole control valve as described in claim 1, which is characterized in that first accommodating chamber is box cupling inner cavity (11), the both ends of the box cupling inner cavity (11) offer to connect the screw thread (17) of described sleeve pipe (5).

3. annular pressure downhole control valve as claimed in claim 2, which is characterized in that the box cupling (1) offers connection institute State the outage (13) of box cupling inner cavity (11), the outer barrel (2) offer the plunger shaft (24) that connects outer tube inner chamber (21) and with The inlet opening (23) of plunger shaft (24) connection, the inlet opening (23) also connect with the external of described sleeve pipe (5)；

When the box cupling (1) and the outer barrel (2) connect, the outage (13), the plunger shaft (24) and the feed liquor Hole (23) is sequentially communicated to form the one-way flow passage.

4. annular pressure downhole control valve as claimed in claim 3, which is characterized in that the spool (3) includes being sequentially connected Spring base (33), piston body (32) and mandril (31), the outer diameter of the piston body (32) is more than the outer diameter of the mandril (31) Intake chute (322) is provided in the axial direction with the outer wall of the outer diameter of the spring base (33), and the piston body (32)；

The piston body (32) is located in the plunger shaft (24) and can be moved along the inner wall of the plunger shaft (24)；

The outer diameter of the mandril (31) is engaged with the internal diameter of the inlet opening (23), and the mandril (31) can be along the feed liquor The inner wall movement in hole (23).

5. annular pressure downhole control valve as claimed in claim 4, which is characterized in that be arranged with bullet on the spring base (33) Spring (4), one end of the spring (4) are connected on the surface that the piston body (32) is connected with spring base, and the other end is connected to The outer surface of the box cupling (1).

6. annular pressure downhole control valve as claimed in claim 4, which is characterized in that the intake chute (322) be equipped with it is multiple, Multiple intake chutes (322) are uniformly distributed along the circumferential direction of the piston body (32).

7. annular pressure downhole control valve as claimed in claim 4, which is characterized in that the plunger shaft (24) connection it is described into One end of fluid apertures (23) is taper surface, and the part that the piston body (32) is connected with the mandril (31) is and the taper surface phase The type conical bench (321) of cooperation.

8. annular pressure downhole control valve as claimed in claim 4, which is characterized in that the box cupling (1) offer with it is described The blind hole (14) of plunger shaft (24) connection, and the spring base (33) one end is placed in the blind hole (14) and can be along the blind hole (14) inner wall movement；

The pressure transmission hole (331) for connecting the outage (13) and the blind hole (14) is offered on the spring base (33).

9. annular pressure downhole control valve as claimed in claim 5, which is characterized in that box cupling tube wall offers first on (12) Ring-shaped step (15) and the second ring-shaped step (16), one end of the spring (4) are connected to the first annular step (15) On step surface, the step surface of second ring-shaped step (16) is abutted with the end face of the outer barrel (2).

10. annular pressure downhole control valve as claimed in claim 9, which is characterized in that the box cupling (1) and the outer barrel (2) welding or riveting are used and is sealed.