Pressure and flow integrated automatic controller for oilfield water injection and oilfield water injection system

Abstract

The utility model discloses a pressure and flow integrated automatic control instrument for oilfield water injection and an oilfield water injection system. The pressure and flow integrated automatic control instrument comprises a shell, a pressure flow sensor comprising a sensor probe and a sensor ejector rod is arranged in the shell; the sensor probe comprises a detection part and a first connecting part, and the detection part is of a hollow protruding structure; a pressure guide hole close to the top is formed in the side face of the protruding structure, and the diameter of the pressure guide hole is smaller than the radial size of the protruding structure; the pressure guide hole is formed in one side, opposite to the water flow coming direction, of the bulge structure; one side, facing the water flow incoming direction, of the protruding structure is used as a flow detection electrode; the sensor ejector rod is in a hollow cylinder shape, and a flow wiring terminal is arranged on the inner side wall of the sensor ejector rod. By means of the pressure flow sensor integrating the flow monitoring function and the pressure monitoring function, the real-time performance, synchronism and accuracy of pressure and flow monitoring data in oilfield water injection are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to oilfield injection pressure flow monitoring instrument technical field, concretely relates to a pressure flow integrated automatic control instrument for oilfield injection and oilfield injection system. BACKGROUND

[0002] In the oilfield injection development process, the accurate control of flow and pressure is the key to guaranteeing injection efficiency and maintaining formation pressure. In the traditional technology, the measurement and control of flow and pressure are usually realized through split type instruments, that is, flow meters and pressure gauges are independently installed, and data is adjusted through external control system linkage. The existing pressure and flow measurement mode has the following problems:

[0003] 1. Complex structure: flow meters, pressure transmitters and control valves need to be installed respectively, occupying a large space and having complicated pipeline arrangement.

[0004] 2. High cost: multiple devices and supporting cables increase procurement and maintenance costs.

[0005] 3. Poor data synchronization: split instruments have acquisition delay, leading to lagging response of regulation and control and affecting injection accuracy.

[0006] 4. Insufficient high-pressure resistance: traditional split type instruments are prone to sealing failure or measurement drift under high pressure working conditions.

[0007] Therefore, an integrated, high-precision and high-pressure resistant integrated flow pressure automatic control device is urgently needed.

[0008] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the utility model, and therefore can include information that does not constitute prior art known to those skilled in the art. CONTENT OF THE UTILITY MODEL

[0009] In order to solve the above problems existing in the prior art, the utility model provides a pressure flow integrated automatic control instrument for oilfield injection and an oilfield injection system. The technical problem to be solved by the utility model is realized through the following technical scheme:

[0010] In the first aspect, the utility model provides a pressure flow integrated automatic control instrument for oilfield injection, which comprises a shell; along the flow direction of water flow, the shell comprises an inlet section, a vortex street generator, a pressure flow sensor, an adjusting valve assembly and an outlet section in sequence; an electromagnetic assembly is fixedly installed outside the shell, and the electromagnetic assembly is used for generating a flow vortex street signal of water flow passing through the vortex street generator;

[0011] The pressure flow sensor comprises a sensor probe and a sensor top rod connected with the sensor probe;

[0012] The sensor probe includes a detection part and a first connecting part. The detection part is a hollow protruding structure. The side of the protruding structure has a pressure guiding hole near the top, and the diameter of the pressure guiding hole is smaller than the radial dimension of the protruding structure. A pressure measuring component is provided at the bottom of the protruding structure. The pressure guiding hole is located on the side of the protruding structure opposite to the direction of water flow. The side of the protruding structure facing the direction of water flow is used as a flow detection electrode to receive the flow vortex signal.

[0013] The sensor top rod is a hollow cylindrical shape, and a flow connection terminal is provided on the inner side wall of the sensor top rod;

[0014] The regulating valve assembly is used to regulate the flow rate of water.

[0015] In one embodiment of this utility model, the dimension of the protrusion structure in the length direction is defined as L, and the distance from the center of the pressure guiding hole to the top of the protrusion structure is 0.1L to 0.4L.

[0016] In one embodiment of this utility model, the sensor top rod includes a second connecting part and a wire tube, the second connecting part is connected to the first connecting part to form a cavity; the pressure measuring component is located inside the cavity near the protruding structure, and the flow rate terminal is located on the side wall of the cavity.

[0017] In one embodiment of this utility model, the pressure measuring component is connected to at least one pressure signal line, and the flow terminal is connected to at least one flow signal line; both the pressure signal line and the flow signal line are located inside the conduit.

[0018] In one embodiment of the present invention, the pressure measuring assembly includes a pressure diaphragm, a diffused silicon pressure measuring element, and an intermediate medium sealed between the pressure diaphragm and the diffused silicon pressure measuring element;

[0019] One side of the pressure diaphragm is for contact with the water flow, and the other side of the pressure diaphragm is for contact with the intermediate medium.

[0020] In one embodiment of the present invention, a control component is further included, which is integrated inside the housing;

[0021] The control component includes a display device, a control circuit, and an input device; the display device is used to display real-time flow rate and real-time pressure, and the input device is used for the user to input a preset flow rate threshold and a preset pressure threshold; the control circuit is used to control the regulating valve assembly based on the real-time pressure and the real-time flow rate, and based on the preset flow rate threshold and the preset pressure threshold.

[0022] The pressure signal line and the flow signal line pass through the conduit and are connected to the control component.

[0023] In one embodiment of this utility model, flanges are provided at the ends of the inlet section and the outlet section, and the flanges are used to connect to the water injection pipeline; the rated pressure of the flanges is greater than or equal to 25MPa.

[0024] Secondly, this utility model provides an oilfield water injection system, including at least one of the above-mentioned integrated pressure and flow automatic controllers, wherein the integrated pressure and flow automatic controller is connected in series to the water injection pipeline of the oilfield water injection system; in each of the integrated pressure and flow automatic controllers, the regulating valve assembly is located downstream of the pressure and flow sensor;

[0025] The protruding structure in the integrated pressure and flow controller has a pressure guiding hole on one side facing away from the water flow, which is used to transmit water pressure to the pressure measuring component; the side of the protruding structure without the pressure guiding hole faces the water flow and is used as a flow detection electrode to receive the flow vortex signal.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] 1. This utility model, through the structural design of the detection unit, obtains a pressure-flow sensor that integrates flow monitoring and pressure monitoring functions. On the one hand, it enables simultaneous measurement of pressure and flow, avoiding data acquisition delays and improving the real-time performance, synchronization, and accuracy of pressure and flow monitoring, facilitating more precise control of oilfield water injection. On the other hand, the integrated design of pressure and flow measurement facilitates the modularization of the pressure-flow sensor, allowing it to be installed entirely within the housing, simplifying installation and replacement, reducing maintenance costs, and achieving a high degree of integration in the automatic control instrument.

[0028] 2. Compared with existing technologies, the integrated pressure and flow sensor in the automatic control unit eliminates the need for a separate pressure sensor downstream of the automatic control unit, simplifying the installation structure of the entire oilfield water injection system and reducing the cost of the equipment.

[0029] 3. This utility model integrates the pressure and flow sensor, regulating valve group, and control components into the housing, achieving a high degree of integration of the automatic controller, simultaneously realizing flow and pressure measurement, as well as flow regulation, and reducing the installation complexity at the application site.

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0031] Figure 1This is a cross-sectional structural schematic diagram of an integrated pressure and flow rate automatic control instrument for oilfield water injection provided by an embodiment of this utility model;

[0032] Figure 2 This is a cross-sectional schematic diagram of the pressure and flow sensor in the integrated pressure and flow controller provided in this embodiment of the utility model.

[0033] Figure 3 This is a cross-sectional schematic diagram of the sensor probe in the integrated pressure and flow controller provided in this embodiment of the utility model;

[0034] Figure 4 This is a cross-sectional schematic diagram of the sensor top rod in the integrated pressure and flow controller provided in this embodiment of the utility model;

[0035] Figure 5 In the integrated pressure and flow controller provided in this embodiment of the utility model, the pressure and flow sensor is... Figure 1 The location diagram is shown in the image.

[0036] Figure 6 This is a connection diagram of the integrated pressure and flow rate controller in the oilfield water injection system provided in this embodiment of the utility model.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1-Housing; 2-Inlet section; 3-Pressure and flow sensor; 301-Detection unit; 302-First connection part; 303-Second connection part; 304-Wire conduit; 305-Pressure guiding hole; 306-Pressure diaphragm; 307-Diffuse silicon pressure measuring element; 308-Flow terminal; 309-Pressure signal line; 310-Flow signal line; 4-Regulating valve assembly; 5-Outlet section; 6-Control assembly; 7-Vortex generator; 8-Electromagnetic assembly; 100-Inlet water injection line; 200-Outlet water injection line. Detailed Implementation

[0039] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a description of an integrated pressure and flow rate automatic control instrument and an oilfield water injection system proposed according to this utility model.

[0040] The foregoing and other technical contents, features, and effects of this utility model will be clearly presented in the following detailed description of the specific embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding can be gained of the technical means and effects adopted by this utility model to achieve the intended purpose. However, the accompanying drawings are only provided for reference and illustration and are not intended to limit the technical solution of this utility model.

[0041] It should be noted that, in this document, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "at least one" means one or two or more, unless otherwise explicitly specified. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not expressly listed.

[0042] This utility model provides a pressure and flow integrated automatic control instrument for oilfield water injection, such as... Figures 1-4 As shown, the device includes a housing 1. Along the water flow direction, the housing 1 sequentially includes an inlet section 2, a vortex generator 7, a pressure and flow sensor 3, a regulating valve assembly 4, and an outlet section 5. An electromagnetic assembly 8 is fixedly installed outside the housing 1. This electromagnetic assembly 8 is used to generate a flow vortex signal in the water flowing through the vortex generator 7. The pressure and flow sensor 3 includes a sensor probe and a sensor rod connected to the sensor probe. The sensor probe includes a detection part 301 and a first connecting part 302. The detection part 301 is a hollow protruding structure. The side of the protruding structure has a pressure guiding hole 305 near the top. The diameter of the pressure guiding hole 305 is smaller than the radial dimension of the protruding structure. A pressure measuring assembly is provided at the bottom of the protruding structure. The pressure guiding hole 305 is located on the side of the protruding structure opposite to the water flow direction. The side of the protruding structure facing the water flow direction serves as a flow detection electrode to receive the flow vortex signal. The sensor rod is a hollow cylindrical shape. A flow terminal 308 is provided on the inner side wall of the sensor rod for receiving the signal transmitted by the flow detection electrode. The regulating valve assembly 4 is used to regulate the flow rate of water.

[0043] The integrated pressure and flow rate controller provided by this utility model is a pressure and flow rate sensor 3 that integrates pressure measurement and flow rate measurement. The sensor probe of this pressure and flow rate sensor 3 can be used to achieve synchronous monitoring of water pressure and flow rate, such as... Figure 2As shown, the sensor probe's detection section 301 is a hollow, protruding structure with a closed top, resembling a "hat." A pressure-guiding hole 305 is located on the side near the top of the protruding structure, and a pressure-measuring component is positioned at the bottom. Thus, the cavity formed by the protruding structure is a one-way open structure. When water flows into the hollow detection section 301 from the pressure-guiding hole 305, it acts on the pressure-measuring component, enabling pressure monitoring. In other words, water flows into the cavity of the protruding structure but does not flow out; it is only used to transmit pressure. Simultaneously, a vortex generator 7 is installed inside the housing, and water flowing through it forms a vortex flow. An electromagnetic component 8 is installed on the outside of the housing 1, and the vortex flow passes through the magnetic field formed by the electromagnetic component 8, generating a flow vortex signal. The side of the detection section 301 facing the direction of water flow serves as a flow detection electrode, receiving this flow vortex signal and transmitting it to the flow terminal, thereby achieving flow monitoring. The pressure-flow sensor 3 is positioned as follows... Figure 5 As shown, the pressure guiding hole 305 is located on the side of the protruding structure facing away from the water flow direction. This allows for fluid pressure measurement while preventing impurities in the water flow from entering the pressure guiding hole 305, which could affect the accuracy of the pressure measurement or even block it. Therefore, in this embodiment, the diameter of the pressure guiding hole 305 should not be too large to avoid part of the opening facing the water flow direction, which could cause impurities to be flushed into the pressure guiding hole 305. Furthermore, the side without the pressure guiding hole 305 faces the water flow direction; that is, the side without the pressure guiding hole 305 is closer to the vortex generator 7, facilitating the reception of flow vortex signals. In other words, through ingenious structural design, this invention integrates the pressure measuring device and the flow measuring device into a single integrated pressure and flow sensor 3, thereby achieving real-time, synchronous acquisition of flow and pressure, simplifying the structure of the automatic control instrument, and optimizing the accuracy and reliability of the monitoring data.

[0044] In one example, the sensor probe's detection section 301 and first connecting section 302 are integrally formed, and the sensor probe as a whole is conductive. The sensor push rod is at least partially conductive, allowing the flow vortex signal received by the detection section 301 to be conducted to the flow terminal.

[0045] In one example, the protrusion is a truncated cone with an arc-shaped top. That is, the various cross-sections of the protrusion are concentric circles of different diameters.

[0046] In some embodiments, such as Figure 2 and Figure 5 As shown, the dimension along the length of the protruding structure is defined as L, and the distance from the center of the pressure guide hole 305 to the top of the protruding structure is 0.1L to 0.4L. The pressure flow sensor 3... Figure 5 The indicated orientation is fixed inside the outer casing 1, combined with Figure 1As shown, the protruding structure is only partially exposed within the flow channel inside the outer casing 1, with the remaining portion sealed within the casing to prevent water from entering. It is understandable that if the size of the protruding structure exposed within the outer casing 1 is too large or too small, it will affect the acquisition of the flow vortex signal by the detection unit 301. The portion of the protruding structure exposed within the flow channel of the outer casing 1 is defined as the protruding substructure. While ensuring an appropriate length for the protruding substructure, it is also necessary to ensure that the pressure guiding hole 305 is located on this protruding substructure. Therefore, the distance from the center of the pressure guiding hole 305 to the top of the protruding structure is set to 0.1L to 0.4L, which satisfies the requirement for efficient reception of the flow vortex signal without affecting the water flow into the pressure guiding hole 305 for pressure measurement.

[0047] In one embodiment, such as Figure 2 , Figure 3 and Figure 4 As shown, the sensor top rod includes a second connecting part 303 and a wire tube 304. The second connecting part 303 is connected to the first connecting part 302 to form a cavity. The pressure measuring component is located inside the cavity near the protruding structure, and the flow terminal 308 is located on the side wall of the cavity.

[0048] For example, the pressure measuring component is connected to at least one pressure signal line 309, and the flow terminal 308 is connected to at least one flow signal line 310; both the pressure signal line 309 and the flow signal line 310 are located inside the conduit 304. Integrating the pressure measuring component and the flow terminal 308 into a sealed cavity, and passing the pressure signal line 309 and the flow signal line 310 together through the conduit 304, further improves the integration of the pressure and flow sensor 3, reduces the volume it occupies, and allows the pressure and flow sensor 3 to be housed as a separate module within the housing 1, facilitating maintenance and replacement.

[0049] In one embodiment of this utility model, such as Figure 3 As shown, the pressure measuring assembly includes a pressure diaphragm 306, a diffused silicon pressure measuring element 307, and an intermediate medium sealed between the pressure diaphragm 306 and the diffused silicon pressure measuring element 307. One side of the pressure diaphragm 306 is in contact with the water flow to be measured, and the other side of the pressure diaphragm 306 is in contact with the intermediate medium. In practical applications, the pressure diaphragm 306 contacts the water flow to be measured and undergoes bending deformation under the pressure of the water flow. The minute deformation of the pressure diaphragm 306 acts on the intermediate medium and is transmitted to the diffused silicon pressure measuring element 307, which converts the pressure signal into a voltage signal and outputs it through the pressure signal line 309.

[0050] In one example, the intermediate medium is a stable liquid, preferably silicone oil. As an incompressible medium, silicone oil can transmit pressure from the pressure diaphragm 306 to the diffused silicon pressure sensing element 307 with almost no loss and no delay.

[0051] In one embodiment of this utility model, a control component 6 is further included. The control component 6 includes a display device, a control circuit, and an input device. The pressure signal line 309 and the flow signal line 310 pass through the conduit 304 and are connected to the control component 6. In this embodiment, the control component 6 can be integrated into the housing 1, further improving the integration of the integrated pressure and flow controller.

[0052] In one example, the display device is used to display real-time flow and real-time pressure. That is, the display device is used to display the real-time monitoring data of the integrated pressure and flow sensor 3, facilitating intuitive viewing of the monitoring data. For example, the display device can be a small display panel integrated into the housing 1, improving the integration of the automatic control unit while allowing operators to monitor key parameters of oilfield water injection and visually display the overall operating status of the equipment. For instance, a touchscreen can be embedded in the housing 1.

[0053] In one example, the input device is used to input a preset flow rate threshold and a preset pressure threshold.

[0054] In one example, the control circuit controls the regulating valve assembly 4 based on real-time pressure and flow rate, and based on preset flow rate thresholds and preset pressure thresholds. Exemplarily, the control circuit includes a signal processing circuit, a microcontroller circuit, and a regulating valve assembly drive circuit. The signal processing circuit filters, amplifies, and performs AD conversion on the flow and pressure signals from the pressure and flow sensor 3 to obtain real-time pressure and flow rate. The microcontroller circuit compares the actual monitored real-time pressure and flow rate with the preset flow rate thresholds and preset pressure thresholds. If the flow deviation (the difference between the preset flow rate threshold and the real-time flow rate) exceeds a preset deviation value, the regulating valve assembly drive circuit is driven to adjust; if the pressure exceeds a preset pressure threshold, an alarm is triggered. The regulating valve assembly drive circuit controls the opening of the regulating valve assembly 4, thereby achieving closed-loop flow and pressure control to ensure the stability and accuracy of the water injection parameters. It should be noted that all circuits in the control circuit are commonly used circuits in the prior art and will not be described in detail here.

[0055] In one embodiment of this utility model, flanges are provided at both the end of the inlet section 2 and the end of the outlet section 5. These flanges are used to connect to the water injection pipeline; the rated pressure of the flanges is greater than or equal to 25 MPa. Rated pressure refers to the maximum permissible working pressure that the flange can safely withstand at a specified temperature. In other words, the flange structure in this embodiment can guarantee absolute safety under an operating pressure of 25 MPa.

[0056] To ensure the high-pressure resistance of the integrated pressure and flow controller, in this embodiment of the invention, the outer casing 1 can be made of stainless steel. Similarly, the interior of the outer casing 1, including the sidewalls of the protruding structures, the first connecting part 302, the second connecting part 303, and the sidewalls of the conduit 304, can also be made of stainless steel. This ensures the working pressure of the integrated pressure and flow controller without increasing material costs.

[0057] This utility model embodiment also provides an oilfield water injection system, which includes at least one integrated pressure and flow rate controller provided in any of the above embodiments. In each integrated pressure and flow rate controller, the regulating valve assembly 4 is located downstream of the pressure and flow rate sensor 3. Each integrated pressure and flow rate controller is connected in series to the water injection pipeline of the oilfield water injection system; wherein, the protruding structure in the integrated pressure and flow rate controller has a pressure guiding hole 305 on one side facing away from the water flow direction; the side of the protruding structure without the pressure guiding hole 305 faces the water flow direction.

[0058] In one embodiment of this utility model, such as Figure 6 As shown, this is a single integrated pressure and flow controller. Figure 6 The diagram shows the connection between the structure indicated in the dashed box and the water injection pipeline of the oilfield water injection system. In existing technology, using a flow controller requires a first pressure sensor to be installed on the water injection pipeline 100 at the inlet end of the flow controller, and a second pressure sensor to be installed on the water injection pipeline 200 at the outlet end of the flow controller, in order to monitor formation pressure through pressure changes. However, by using the integrated pressure and flow controller provided by this invention, both flow and pressure can be monitored simultaneously, eliminating the need for a second pressure sensor on the water injection pipeline 200 at the outlet end. This reduces the number of external connection devices and improves the synchronization of pressure and flow monitoring data.

[0059] In another embodiment of this utility model, multiple integrated pressure and flow controllers provided by this utility model can be connected in series to the water injection pipeline according to the actual application scenario. In this way, no additional pressure sensors are needed on the downstream outlet water injection pipeline 200 of each integrated pressure and flow controller, greatly simplifying the oilfield water injection system. At the same time, the integrated pressure and flow controller can simultaneously monitor flow and pressure, ensuring the synchronization and real-time nature of the monitoring results and improving the water injection accuracy of the oilfield water injection system.

[0060] Taking a single integrated pressure and flow controller as an example, its application in oilfield water injection systems is further illustrated. First, the integrated pressure and flow controller is installed in series on the water injection pipeline using a high-pressure flange (rated pressure greater than or equal to 25MPa) conforming to HG / T20592 standards. The regulating valve assembly 4 is located downstream of the pressure and flow sensor 3. Then, a preset flow threshold of 20m³ is input via the input device.3 / d and a preset pressure threshold of 25 MPa. Start the oilfield water injection system. Under the action of the micro-control circuit, compare the actual monitored flow rate and pressure with the preset values ​​in real time. If the flow rate deviation exceeds ±2%, the regulating valve assembly drive circuit will adjust the opening of the regulating valve assembly 4. If the pressure exceeds the limit, an alarm will be triggered on the display device.

[0061] In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," or "some examples," etc., indicate that a specific feature, structure, or material described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or materials described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0062] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A pressure and flow integrated self-control instrument for oilfield water injection, characterized in that, The utility model relates to a water flow control device, comprising a shell (1), an inlet section (2), a vortex generator (7), a pressure flow sensor (3), a regulating valve assembly (4) and an outlet section (5) are sequentially arranged in the shell (1) along the flow direction of water flow, an electromagnetic assembly (8) is fixedly installed outside the shell (1), and the electromagnetic assembly (8) is used to make the water flow through the vortex generator (7) generate a flow vortex signal. The pressure flow sensor (3) comprises a sensor probe and a sensor top rod connected with the sensor probe. The sensor probe comprises a detection part (301) and a first connecting part (302), the detection part (301) is a hollow protruding structure, the protruding structure has a pressure guide hole (305) near the top on the side, the diameter of the pressure guide hole (305) is smaller than the radial dimension of the protruding structure, a pressure measuring assembly is arranged at the bottom of the protruding structure, the pressure guide hole (305) is arranged on the side of the protruding structure away from the water flow direction, and the side of the protruding structure towards the water flow direction is used as a flow detection electrode to receive the flow vortex signal. The sensor top rod is a hollow cylinder, and a flow wiring terminal (308) is arranged on the inner side wall of the sensor top rod. The regulating valve assembly (4) is used to adjust the flow of water.

2. The pressure and flow integrated automatic controller for water injection in oil fields according to claim 1, characterized in that, The length of the protruding structure is defined as L, and the distance from the center of the pressure guide hole (305) to the top of the protruding structure is 0.1L-0.4L.

3. The pressure and flow integrated automatic controller for oilfield water injection according to claim 1 or 2, characterized in that, The sensor top rod comprises a second connecting part (303) and a wire tube (304), the second connecting part (303) is connected with the first connecting part (302) to form a cavity, the pressure measuring assembly is arranged in the cavity near the protruding structure, and the flow wiring terminal (308) is arranged on the side wall of the cavity.

4. The pressure and flow integrated automatic controller for water injection in oil fields according to claim 3, characterized in that, The pressure measuring assembly is connected with at least one pressure signal line (309), the flow wiring terminal (308) is connected with at least one flow signal line (310), and the pressure signal line (309) and the flow signal line (310) are arranged in the wire tube (304).

5. The pressure and flow integrated automatic controller for water injection in oil fields according to claim 4, characterized in that, The pressure measuring assembly comprises a pressure diaphragm (306), a diffusion silicon pressure measuring element (307) and an intermediate medium arranged between the pressure diaphragm (306) and the diffusion silicon pressure measuring element (307). One side of the pressure diaphragm (306) is used to contact water flow, and the other side of the pressure diaphragm (306) is used to contact the intermediate medium.

6. The pressure and flow integrated self-control instrument for oilfield water injection according to claim 5, characterized in that, The utility model further comprises a control assembly (6) arranged in the shell (1). The control assembly (6) comprises a display device, a control circuit and an input device, the display device is used to display real-time flow and real-time pressure, and the input device is used for a user to input a preset flow threshold and a preset pressure threshold. The control circuit is used to control the regulating valve assembly (4) according to the real-time pressure and the real-time flow and according to the preset flow threshold and the preset pressure threshold. The pressure signal line (309) and the flow signal line (310) are led out of the lead-through (304) and connected to the control assembly (6).

7. The pressure and flow integrated self-control instrument for water injection in oil fields according to claim 1, characterized in that, The end of the inlet section (2) and the end of the outlet section (5) are provided with flanges for connecting to a water injection pipeline; the rated pressure of the flanges is greater than or equal to 25 MPa.

8. An oilfield water injection system characterized by, The oilfield water injection system comprises at least one pressure and flow integrated automatic control instrument according to any one of claims 1-7, which is connected in series to a water injection pipeline of the oilfield water injection system; in each pressure and flow integrated automatic control instrument, the regulating valve assembly (4) is located downstream of the pressure and flow sensor (3); The protruding structure in the pressure and flow integrated automatic control instrument has one side of the pressure guide hole (305) facing away from the water flow direction, which is used for conducting water pressure to the pressure measuring assembly; the other side of the protruding structure without the pressure guide hole (305) faces the water flow direction, which is used as a flow detection electrode to receive the flow vortex street signal.

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