Three-way pressure measuring valve and intelligent separate injection and separate production system and pressure measuring method thereof

Abstract

The invention discloses a three-way pressure measuring valve and an intelligent separate injection and separate production system and a pressure measuring method thereof, and relates to the field of pressure measurement, the three-way pressure measuring valve comprises a valve shell, a sealing ring, a movable iron core, a fixed iron core and other parts, and the position of a valve element is controlled through the action of a reset spring and a coil, and the communication state of a valve cavity is switched. The same pressure sensor is used for measuring the annulus pressure (pressure intensity) of the oil pipe and the oil sleeve in a time-sharing mode, and the problem that the accuracy of a detection result is affected by offset difference caused by different pressure impacts of two independent pressure sensors is solved. The system is filled with low-viscosity silicone oil, internal parts are protected against corrosion, friction force is reduced, the overall structural design ensures accurate pressure measurement, and the system stability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure measurement, and specifically to a three-way pressure measurement valve, its intelligent separate injection and production system, and a pressure measurement method. Background Art

[0002] In the downhole intelligent separate injection and production system for oil extraction, accurately measuring the pressure (pressure intensity) of the tubing and the annulus between the tubing and the casing is crucial. The measurement data reflects the fluid state of the channels and the formation state during the operation of the system, which is the key to controlling the injection or production volume of each formation and directly affects whether the intelligent separate injection and production system can be implemented with high precision.

[0003] Currently, the common measurement method is to use two pressure sensors to separately measure the pressure (pressure intensity) of the tubing and the annulus between the tubing and the casing through independent channels, and the single-chip microcomputer obtains the signals and then performs calculations. However, the sensors themselves have problems such as manufacturing errors and inconsistent temperature drifts, resulting in large errors in the calculated values after measurement and it is difficult to ensure accuracy. If two high-precision pressure sensors are used, although the error can be reduced, the system cost will be greatly increased. In the complex downhole environment, it becomes more difficult to accurately measure the pressure.

[0004] Therefore, there is an urgent need to develop a new pressure measurement technology to solve the problems existing in the prior art, achieve accurate measurement, and reduce costs. Summary of the Invention

[0005] The purpose of the present invention is to provide a three-way pressure measurement valve, its intelligent separate injection and production system, and a pressure measurement method to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: In the first aspect, a three-way pressure measurement valve includes a valve housing, and a sealing ring, a moving iron core, and a fixed iron core are sequentially arranged inside the valve housing; The moving iron core is connected to a valve core, the valve core includes a rod portion and a cone portion, the rod portion of the valve core penetrates through the sealing ring, and there is a dynamic seal between the rod portion of the valve core and the sealing ring; An inner conical surface is provided inside the valve housing corresponding to the cone portion of the valve core, and the inner conical surface of the valve housing is nested with the cone portion of the valve core; One end of the valve housing close to the sealing ring is provided with an end cover A, and a valve chamber A is jointly formed among the end cover A, the valve housing, the sealing ring, and the rod portion of the valve core; A valve chamber B is jointly formed among the valve housing, the sealing ring, and the valve core; A valve chamber C is jointly formed among the valve housing, the cone portion of the valve core, and the moving iron core; The moving iron core is slidably connected inside the valve housing, and the moving iron core is connected to the valve housing through a return spring; Channels are provided in the valve core, the moving iron core, and the fixed iron core, and the channels in the valve core, the channels in the moving iron core, the channels in the fixed iron core, and the partial space in the valve housing corresponding to the space between the moving iron core and the fixed iron core together constitute the pressure guiding channel C; Radial holes A and B are respectively provided in the rod part and the conical part of the valve core, and both the radial hole A and the radial hole B communicate with the pressure guiding channel C. The meaning of the radial hole is a hole penetrating the valve core on the valve core, similar to the style of a pinhole.

[0007] A pressure sensor is provided at one end of the valve housing corresponding to the fixed iron core, and the pressure sensor is arranged at a position corresponding to the pressure guiding channel C; A coil is installed on the valve housing at a position corresponding to the fixed iron core. In the system, the coil needs to be connected; Holes are provided on the end cover A and on the valve housing at positions corresponding to the valve chamber B.

[0008] Preferably, the moving iron core and the valve core are fixedly connected.

[0009] Preferably, the moving iron core and the valve core are floatingly connected.

[0010] Preferably, an end cover B is installed at one end of the valve housing corresponding to the pressure sensor.

[0011] Preferably, sealing rings A and C are provided on the surface of the valve housing.

[0012] Preferably, a sealing ring B is provided between the sealing ring and the valve housing (12).

[0013] In a second aspect, a pressure measurement system of a three-way pressure measurement valve includes a connection part. A valve installation hole is provided in the connection part, and the three-way pressure measurement valve is installed on the connection part through the valve installation hole. A pressure guiding channel B is jointly formed among the sealing ring A, the valve housing, and the connection part, and is communicated with the valve chamber A through the hole provided on the end cover A; A pressure guiding channel A is jointly formed among the sealing ring A, the valve housing, the connection part, and the sealing ring C, and the hole provided on the valve housing is communicated with the valve chamber B; It further includes a controller, the controller is connected to the pressure sensor, and the controller is connected to the coil through an electric wire.

[0014] Compared with the prior art, the beneficial effects of the present invention are: in the valve housing, the valve core position is controlled by the action of the return spring and the coil to switch the valve chamber connection state. The same pressure sensor is used to measure the pressure (pressure) of the oil pipe and the oil casing annulus in a time-sharing manner, avoiding the problem that the difference in offset caused by different pressure shocks of two independent pressure sensors affects the accuracy of the detection results. At the same time, it can also reduce the cost of component procurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the three-way pressure measuring valve of the present invention; Figure 2 It is a structural schematic diagram of the three-way pressure measuring valve when measuring the casing annulus pressure of the present invention.

[0016] In the figure: 1. pressure-conducting channel A; 2. valve chamber B; 3. pressure-conducting channel B; 4. silicone oil; 5. valve chamber A; 6. end cover A; 7. valve mounting hole; 8. sealing ring A; 9. sealing ring; 10. sealing ring B; 11. valve core; 111. rod; 112. cone; 12. valve housing; 13. sealing ring C; 14. valve chamber C; 15. reset spring; 16. moving iron core; 17. coil; 18. fixed iron core; 19. pressure-conducting channel C; 20. pressure sensor; 21. end cover B; 22. radial hole A; 23. radial hole B. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the field of oilfield exploitation, in order to adapt to the complex environment underground, intelligent injection and extraction are often used to assist in oil extraction. During the oil extraction process, it is necessary to monitor the pressure (pressure) parameters in the oil pipe and the casing annulus at all times. The injection volume or extraction volume of each layer can be controlled through accurate pressure parameters. At present, it is common to monitor the pressure parameters in the oil pipe and the casing annulus respectively through two independent pressure sensors 20. The physical components of the pressure sensor 20 will be offset after working for a period of time. Due to the different pressures in the oil pipe and the casing annulus, the offsets generated by the two pressure sensors 20 will be different under different pressure shocks. As time goes by, the difference in the offset will become larger and larger, and the accuracy of the detection results is difficult to guarantee.

[0019] See also Figure 1-2, a three-way pressure measuring valve, its intelligent separate injection and production system, and a pressure measuring method are proposed. The three-way pressure measuring valve includes a valve housing 12, which is composed of upper and lower parts, mainly facilitating the installation and connection of components. The usual connection position is below the inner conical surface protruding inside the valve housing 12, which will not be elaborated here. And a sealing ring 9, a moving iron core 16, and a fixed iron core 18 are sequentially arranged inside the valve housing 12. The moving iron core 16 is connected with a valve core 11, and a sealing ring B10 is arranged between the sealing ring 9 and the valve housing 12.

[0020] The tubing-casing annulus refers to the annular space between the tubing and the casing in an oil well. The tubing is a pipe used to transport crude oil from the bottom of the well to the ground, while the casing is a tubular structure lowered into the well to protect the wellbore and isolate different formations. The annular area formed between the two is the tubing-casing annulus.

[0021] The connection between the moving iron core 16 and the valve core 11 is a rigid connection.

[0022] Among them, if the connection between the moving iron core 16 and the valve core 11 is a rigid connection, the connection between the moving iron core 16 and the valve housing 12 needs to be very tight and there should be no angular deviation. Therefore, the precision requirements for components are relatively high. Considering the cost and price issues, different from the above, the connection between the moving iron core 16 and the valve core 11 can be set as a floating connection, for example, by means of a T-shaped union. This not only facilitates installation and disassembly, but also even if the moving iron core 16 swings within a certain range, the valve core 11 can still maintain good sealing performance, ensuring that the sealing between valve chambers is not affected and guaranteeing the accuracy of pressure (pressure) measurement and the stability of the system.

[0023] The valve core 11 includes a rod portion 111 and a cone portion 112. The rod portion 111 of the valve core 11 penetrates through the sealing ring 9, and there is a dynamic seal between the rod portion 111 of the valve core 11 and the sealing ring 9.

[0024] Dynamic seal refers to a sealing method when there is relative movement between two sealed components. In the present invention, a dynamic seal is formed between the inner hole of the sealing ring 9 and the rod portion 111 of the valve core 11. During the working process of the valve core 11, it will move axially with the movement of the moving iron core 16, and there is relative movement between the sealing ring 9 and the rod portion 111 of the valve core 11. At this time, the seal belongs to a dynamic seal. The dynamic seal effectively prevents the leakage of the medium between the valve chambers and avoids the mutual interference of media with different pressures. During the process of measuring the pressure (pressure) inside the tubing and the pressure (pressure) in the tubing-casing annulus, it ensures the pressure stability of each valve chamber, enabling the pressure sensor 20 to accurately measure the corresponding pressure value.

[0025] An inner conical surface is provided inside the valve housing 12 corresponding to the cone portion 112 of the valve core 11, and the inner conical surface of the valve housing 12 is nested with the cone portion 112 of the valve core 11. Figure 1It is only for showing the shape of the tapered portion 112. In practice, the tapered portion 112 is usually flush with the inner tapered surface to facilitate the subsequent pressure extrusion of the tapered portion 112 towards the inner tapered surface for close contact.

[0026] One end of the valve housing 12 close to the sealing ring 9 is provided with an end cover A6. A valve chamber A5 is jointly formed among the end cover A6, the valve housing 12, the sealing ring 9, and the rod portion 111 of the valve core 11.

[0027] A valve chamber B2 is jointly formed among the valve housing 12, the sealing ring 9, and the valve core 11. A valve chamber C14 is jointly formed among the valve housing 12, the tapered portion 112 of the valve core 11, and the moving iron core 16. The moving iron core 16 is slidably connected inside the valve housing 12, and the moving iron core 16 is connected to the valve housing 12 through a return spring 15.

[0028] Channels are provided inside the valve core 11, the moving iron core 16, and the fixed iron core 18. The channels inside the valve core 11, the channels inside the moving iron core 16, the channels inside the fixed iron core 18, and the partial space inside the valve housing 12 corresponding to the positions between the moving iron core 16 and the fixed iron core 18 jointly constitute a pressure guiding channel C19. A pressure sensor 20 is provided at one end of the valve housing 12 corresponding to the fixed iron core 18, and the pressure sensor 20 is arranged corresponding to the position of the pressure guiding channel C19. Through the pressure guiding channel C19, the pressure of the fluid can be transmitted to the pressure sensor 20, thereby completing the measurement of pressure (pressure intensity).

[0029] A coil 17 is installed at the position of the valve housing 12 corresponding to the fixed iron core 18. The coil 17 is connected to a controller. Holes are provided on the end cover A6 and at the position of the valve housing 12 corresponding to the valve chamber B2.

[0030] Radial holes A22 and radial holes B23 are respectively provided on the rod portion 111 and the tapered portion 112 of the valve core 11. Both the radial holes A22 and the radial holes B23 are communicated with the pressure guiding channel C19.

[0031] In the normal state, as Figure 1 shown, at this time, the coil 17 is not powered on. Under the elastic force of the return spring 15, the moving iron core 16 drives the valve core 11 away from the fixed iron core 18. At this time, the pressure guiding channel C19 is communicated with the valve chamber A5 through the radial hole A22, and the pressure guiding channel C19 is communicated with the valve chamber C14 through the radial hole B23.

[0032] At the same time, the tapered portion 112 of the valve core 11 is in close contact with the inner tapered surface of the valve housing 12 to form a certain degree of hard seal, thereby blocking the communication between the valve chamber B2 and the valve chamber A5 and the valve chamber C14.

[0033] As Figure 2As shown, when the coil 17 is energized, under the drive of magnetic force, the moving iron core 16 drives the valve core 11 to move towards the fixed iron core 18, causing the part of the rod portion 111 of the valve core 11 corresponding to the radial hole A22 to move into the sealing ring 9 and be sealed by the inner hole of the sealing ring 9, and the conical portion 112 of the valve core 11 to leave the inner conical surface of the valve housing 12. At this time, the conical portion 112 of the valve core 11 and the inner conical surface of the valve housing 12 no longer form a seal, the valve chamber B2 and the valve chamber C14 are communicated, and the valve chamber C14 is communicated with the pressure guiding channel C19 through the radial hole B23. At this time, the valve chamber A5 cannot be communicated with the pressure guiding channel C19 through the radial hole A22.

[0034] One end of the valve housing 12 corresponding to the pressure sensor 20 is provided with an end cover B21, which can support the pressure sensor 20.

[0035] As Figure 1-2 shown, when applied in an intelligent separate injection and production system, the intelligent separate injection and production system includes a connecting part, and a valve installation hole 7 is opened on the connecting part. The three-way pressure measuring valve is inserted into the connecting part through the valve installation hole 7. Sealing rings A8 and C13 are arranged on the surface of the valve housing 12. After the three-way pressure measuring valve is inserted, a pressure guiding channel B3 is jointly formed between the sealing ring A8 installed on the valve housing 12, the valve housing 12 and the connecting part. The pressure guiding channel B3 is communicated with the valve chamber A5 through the hole opened on the end cover A6, and the pressure guiding channel B3 is communicated with the oil pipe in the intelligent separate injection and production system.

[0036] Between the sealing ring A8, the sealing ring B10, the valve housing 12 and the valve installation hole 7, a pressure guiding channel A1 is jointly formed. The pressure guiding channel A1 is communicated with the valve chamber B2 through the hole opened on the valve housing 12, and the pressure guiding channel A1 is communicated with the annulus between the tubing and the casing in the intelligent separate injection and production system.

[0037] The controller is connected to the pressure sensor 20, which can be a wired connection or a wireless connection. The controller can read the value of the pressure sensor 20, and the controller is connected to the coil 17 through an electric wire. The controller can control the energization and de-energization of the coil 17.

[0038] First, when it is necessary to measure the pressure (pressure) in the oil pipe, the pressure in the oil pipe enters the valve chamber A5 along the pressure guiding channel B3. At this time, the coil 17 is not energized. Referring to the situation when the coil 17 is not energized described above, Figure 1 at this time, the pressure guiding channel C19 is communicated with the valve chamber A5 through the radial hole A22, and the pressure guiding channel C19 is communicated with the valve chamber C14 through the radial hole B23. Therefore, the pressure in the valve chamber A5 will be transmitted to the pressure sensor 20 through the pressure guiding channel B3, and the pressure sensor 20 can measure the pressure (pressure) in the oil pipe.

[0039] And at this time, the annulus between the tubing and the casing is communicated with the valve chamber B2 through the pressure guiding channel A1, and the pressure in the annulus between the tubing and the casing will be transmitted into the valve chamber B2.

[0040] Because the working condition in the intelligent separate injection and production system is that high-pressure water is pumped into the formation through the annulus between the tubing and the casing from the tubing, the pressure (pressure intensity) in the tubing will always be greater than or equal to the pressure (pressure intensity) in the annulus between the tubing and the casing (usually the pressure (pressure intensity) in the tubing will always be greater than the pressure (pressure intensity) in the annulus between the tubing and the casing). Since the pressure in the tubing is communicated with the valve chamber C14 through the pressure guiding channel B3, the valve chamber A5 and the pressure guiding channel C19, the pressure (pressure intensity) in the valve chamber C14 is equal to the pressure (pressure intensity) in the tubing at this time. Therefore, the pressure (pressure intensity) in the valve chamber C14 is greater than the pressure (pressure intensity) in the valve chamber B2 at this time. Thus, the pressure (pressure intensity) in the valve chamber C14 will squeeze the conical part 112 of the valve core 11 to have a movement tendency towards the inner conical surface of the valve housing 12, increasing the sealing binding force and making the seal more reliable.

[0041] When it is necessary to measure the pressure (pressure intensity) in the annulus between the tubing and the casing, the coil 17 starts to be energized. Referring to the situation where the coil 17 is energized described above, Figure 2 the coil 17 is energized to make the moving iron core 16 overcome the elastic force of the return spring 15 and the pressure difference between the upper and lower ends of the valve core 11 through electromagnetic force, slide towards the direction of the fixed iron core 18, and adsorb together. At this time, the valve core 11 is driven together with the moving iron core 16, and the radial hole A22 moves into the sealing ring 9. At this time, the valve chamber A5 is no longer communicated with the pressure guiding channel C19.

[0042] Since the conical part 112 of the valve core 11 is separated from the inner conical surface of the valve housing 12, the pressure in the valve chamber B2 will be transmitted into the valve chamber C14, and the pressure will be transmitted into the pressure guiding channel C19 through the radial hole B23, so as to be transmitted to the pressure sensor 20, enabling the pressure sensor 20 to measure the pressure (pressure intensity) of the annulus between the tubing and the casing in the pressure guiding channel A1.

[0043] Moreover, since the pressure guiding channel B3 is communicated with the valve chamber A5 at this time, and the pressure (pressure intensity) in the tubing is greater than the pressure (pressure intensity) in the annulus between the tubing and the casing, the pressure received by the rod part 111 of the valve core 11 in the valve chamber A5 is greater than the pressure given to the conical part 112 of the valve core 11 in the valve chamber C14, so that the valve core 11 and the moving iron core 16 are closely attached to the fixed iron core 18, making the whole state more stable, and able to assist the coil 17 to be energized to make the moving iron core 16 move towards the fixed iron core 18 from the side.

[0044] When the coil 17 is just powered off, the electromagnetic force disappears, the moving iron core 16 and the fixed iron core 18 are no longer attracted, and under the action of the reset spring 15, the moving iron core 16 slides in the direction away from the fixed iron core 18 and pushes the valve core 11 away together. Finally, the cone 112 of the valve core 11 is in close contact with the inner cone surface of the valve housing 12, entering into a sealed isolation, and the radial hole A22 of the rod 111 on the valve core 11 also extends out of the sealing ring 9, and the pressure sensor 20 starts to measure the pressure channel B3, that is, the pressure (pressure) in the oil pipe, and maintains this state.

[0045] Among them, the pressure-conducting channel A1, the pressure-conducting channel B3, the pressure-conducting channel C19, the valve mounting hole 7, and the valve housing 12 are filled with low-viscosity silicone oil 4, which is used to protect the fixed iron core 18, the moving iron core 16, the valve core 11, the reset spring 15, and the pressure-sensing surface of the pressure sensor 20 from being corroded by harmful substances in the medium, and to reduce the sliding friction between the outer circle of the moving iron core 16 and the inner hole of the valve housing 12, and between the valve core 11 and the sealing ring 9.

[0046] And the pressure in the oil pipe and the oil casing annulus can be transmitted through the silicone oil 4. The principle is that the pressure sampling ports on the oil pipe and the oil casing annulus transmit the static pressure through the silicone oil 4, so that the pressure sensor 20 can measure the pressure (pressure) on the oil pipe and the oil casing annulus.

[0047] Silicone oil 4 is a liquid with good fluidity and incompressibility. When the pressure port is subjected to the static pressure of crude oil, this pressure will cause the silicone oil 4 at the pressure port to produce corresponding pressure changes. Due to the incompressibility of silicone oil 4, it will transfer the pressure borne by the pressure port to the end face of the pressure sensor 20 connected thereto with almost no loss.

[0048] To sum up, the pressure in the tubing and the pressure in the casing annulus are measured separately, and the measurement processes of the two do not interfere with each other. Through a unique structural design, the same pressure sensor 20 is used to measure the pressure in the tubing and the casing annulus in real time, avoiding the problem of increasing offset differences due to different pressure shocks of the two independent pressure sensors 20, which affects the accuracy of the detection results, thereby ensuring the accuracy of the pressure measurement.

[0049] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A three-way pressure measuring valve, characterized in that: It comprises a valve housing (12), wherein a sealing ring (9), a moving iron core (16) and a fixed iron core (18) are sequentially arranged in the valve housing (12); The movable iron core (16) is connected to a valve core (11), the valve core (11) comprising a stem portion (111) and a cone portion (112), the stem portion (111) of the valve core (11) passing through the sealing ring (9), and a dynamic seal is formed between the stem portion (111) of the valve core (11) and the sealing ring (9); An inner conical surface is provided in the valve housing (12) corresponding to the conical portion (112) of the valve core (11), and the inner conical surface of the valve housing (12) and the conical portion (112) of the valve core (11) are nested; an end cover A (6) is provided at one end of the valve housing (12) close to the sealing ring (9), and a valve chamber A (5) is formed between the end cover A (6), the valve housing (12), the sealing ring (9) and the stem portion (111) of the valve core (11); A valve chamber B (2) is formed between the valve housing (12), the sealing ring (9) and the valve core (11); a valve chamber C (14) is formed between the valve housing (12), the conical portion (112) of the valve core (11) and the moving iron core (16); The moving iron core (16) is slidably connected in the valve housing (12), and the moving iron core (16) is connected to the valve housing (12) via a return spring (15); The valve core (11), the movable iron core (16) and the fixed iron core (18) are all provided with channels, and the channel in the valve core (11), the channel in the movable iron core (16), the channel in the fixed iron core (18) and a portion of the space in the valve housing (12) corresponding to the movable iron core (16) and the fixed iron core (18) together constitute a pressure-conducting channel C (19); A radial hole A (22) and a radial hole B (23) are respectively formed on the stem portion (111) and the cone portion (112) of the valve core (11), and the radial hole A (22) and the radial hole B (23) are both in communication with the pressure-conducting channel C (19); a pressure sensor (20) is provided at one end of the valve housing (12) corresponding to the fixed iron core (18), and the pressure sensor (20) is arranged at a position corresponding to the pressure-conducting channel C (19); A coil (17) is installed on the valve housing (12) at a position corresponding to the fixed iron core (18); holes are provided on the end cover A (6) and on the valve housing (12) at positions corresponding to the valve chamber B (2).

2. A three-way pressure measuring valve according to claim 1, characterized in that: The moving iron core (16) is fixedly connected to the valve core (11).

3. A three-way pressure measuring valve according to claim 1, characterized in that: The moving iron core (16) and the valve core (11) are floatingly connected.

4. A three-way pressure measuring valve according to claim 2 or 3, characterized in that: An end cover B (21) is mounted on one end of the valve housing (12) corresponding to the pressure sensor (20).

5. A three-way pressure measuring valve according to claim 4, characterized in that: A sealing ring A (8) and a sealing ring C (13) are provided on the surface of the valve housing (12).

6. A three-way pressure measuring valve according to claim 5, characterized in that: A sealing ring B (10) is provided between the sealing ring (9) and the valve housing (12).

7. A pressure measurement system using the three-way pressure measuring valve according to any one of claims 5 or 6, characterized in that: The valve body comprises a connecting portion, the connecting portion is provided with a valve mounting hole (7), the three-way pressure measuring valve is mounted on the connecting portion through the valve mounting hole (7), a sealing ring A (8), the valve housing (12) and the connecting portion together form a pressure conducting channel B (3), which is connected to the valve chamber A (5) through a hole formed on the end cover A (6); A pressure-conducting channel A (1) is formed between the sealing ring A (8), the valve housing (12), the connecting portion and the sealing ring C (13); a hole formed on the valve housing (12) is connected to the valve chamber B (2); It also includes a controller, which is connected to the pressure sensor (20), and the controller is connected to the coil (17) via an electric wire.

8. A pressure measurement method using the pressure measurement system according to claim 7, characterized in that: The following steps are involved: The coil (17) is kept de-energized, and under the support of the return spring (15), the movable iron core (16) is separated from the fixed iron core (18), and the movable iron core (16) drives the valve core (11) to move in a direction away from the fixed iron core (18), so that the radial hole A (22) on the stem (111) of the valve core (11) is connected to the valve chamber A (5), and the conical portion (112) of the valve core (11) is nested with the inner conical surface of the valve housing (12); The pressure is transmitted into the pressure conducting channel C (19) through the pressure conducting channel B (3), the valve chamber A (5) and the radial hole A (22); the pressure sensor (20) measures the pressure and uploads the measured data to the controller; The controller transmits current to the coil (17) through an electric wire, and the coil (17) is energized, driving the movable iron core (16) to compress the return spring (15) and move toward the fixed iron core (18) until the movable iron core (16) is in close contact with the fixed iron core (18). The valve core (11) moves toward the fixed iron core (18) driven by the movable iron core (16), and the radial hole A (22) on the rod (111) of the valve core (11) slides into the sealing ring (9). The sealing ring (9) seals the radial hole A (22), and the conical portion (112) of the valve core (11) leaves the inner conical surface of the valve housing (12); The valve chamber B (2) is connected to the valve chamber C (14); the pressure is transmitted to the pressure channel C (19) through the pressure channel A (1), the valve chamber B (2), the valve chamber C (14) and the radial hole B (23); the pressure sensor (20) measures the pressure and uploads the measured data to the controller.

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