A water injection well flow meter field control device and control method

Abstract

This invention relates to the field of water injection well monitoring technology, and particularly to a field control device and method for a water injection well flow meter. The field control device includes a flow meter, an electric valve, and a pressure gauge. The flow meter and electric valve are respectively installed on the water injection well pipeline, and the pressure gauge is located at the lower end of the electric valve. Each device is connected to the well's RTU (Remote Control Unit), which is also connected to a monitoring backend. This device can monitor the water injection well pipeline in real time and achieve data transmission and electric valve control through the well's RTU. When the flow meter reads 0, it automatically times and issues an alarm signal after reaching an alarm time threshold, adjusting the electric valve's operating state to prevent the flow meter from becoming blocked and causing the electric valve to open indefinitely. When the pressure gauge detects that the oil layer pressure exceeds a set threshold, it automatically issues an alarm signal, adjusts the electric valve opening to prevent pressure rise, and regulates the electric valve's operating state, thereby improving the safety of the water injection well operation site.

Description

Technical Field

[0001] This invention relates to the field of water injection well monitoring technology, and in particular to a field control device and control method for a water injection well flow meter. Background Technology

[0002] In the current water injection well system, the flow meter receives instantaneous flow data from a third-party wireless A11 water meter and transmits this data to the regulating valve via an RS485 wired interface. After receiving the instantaneous flow data, the regulating valve compares it with a preset flow value. If there is a difference between the two, the regulating valve will automatically adjust its opening to achieve the preset flow value.

[0003] However, this system lacks the ability to identify flow meter malfunctions. When the flow meter becomes stuck or blocked due to scale, silt, or freezing caused by slow flow in winter, the instantaneous flow data received by the regulating valve may show as zero. Since the system cannot recognize this situation, the regulating valve will mistakenly believe that the actual flow is far lower than the preset value, and thus automatically open the regulating valve. If the flow meter continues to be stuck or blocked, the regulating valve will continue to open, eventually fully opening and losing its regulating function.

[0004] This situation can cause the injection pressure in the injection well to rise continuously, potentially exceeding the formation fracturing pressure, thereby causing irreversible damage to the oil reservoir's oil displacement state. This phenomenon not only poses a serious threat to the normal production of the oil field, but may also lead to significant economic losses and environmental problems. Summary of the Invention

[0005] (a) Technical problems to be solved This invention provides a field control device and method for a water injection well flow meter to overcome the problem that existing water injection well systems lack effective early warning and emergency response mechanisms.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides a field control device for a water injection well flow meter, comprising: a flow meter and an electric valve; The flow meter and the electric valve are respectively installed on the water injection well process pipeline, and the flow meter and the electric valve are placed separately. A pressure gauge is installed on the water injection well process pipeline, and the pressure gauge is located at the lower end of the electric valve; The flow meter, electric valve, and pressure gauge are respectively connected to the oil well RTU; The oil well RTU is connected to the monitoring backend.

[0007] Preferably, the flow meter includes: an excitation device, a magnetic sensor, a data processor, and a wireless signal transmitting device; The excitation device is used to generate a magnetic field. The flow meter is installed on the process pipeline of the water injection well. When water flows through the flow meter, the excitation device and the magnetic sensor work together to detect the induced electromotive force in the water flow. The data processor converts the induced electromotive force into flow data and transmits it to the well RTU via a wireless signal transmitter.

[0008] Preferably, the electric valve includes: a valve, an electric motor, an actuator, and a signal receiver; The actuator is connected to the electric motor, which provides power to the actuator. The actuator is used to control the opening state of the valve, and the signal receiver is used to receive control commands from the oil well RTU.

[0009] Preferably, the flow meter is located at the inlet end of the water injection well process pipeline, and the electric valve is located at the outlet end of the water injection well process pipeline.

[0010] Preferably, the flow meter is placed separately from the electric valve to prevent liquid turbulence caused by valve movement in the electric valve from affecting the flow meter data.

[0011] Preferably, the pressure gauge includes: a pressure sensor and a signal transmitter; The lower end of the pressure sensor is located in the oil layer, and the pressure gauge is used to monitor the pressure changes in the oil layer. The pressure gauge transmits the data collected by the pressure sensor to the oil well RTU via a signal transmitter, and then the oil well RTU sends it to the monitoring backend.

[0012] Preferably, the monitoring backend includes a PC host and a display module.

[0013] On the other hand, the present invention also provides a control method for the control device, including: Flowmeter jamming control method Step S1: Install the flow meter, electric valve and pressure gauge on the water injection well process pipeline respectively, and connect the flow meter, electric valve and pressure gauge to the oil well RTU. Step S12: Set the electric valve to automatic control mode and connect the oil well RTU to the monitoring backend via RS485 cable; Step S13: Set the alarm time threshold of the flow meter. When the value collected by the flow meter is 0, the timer starts. After the alarm time threshold is reached, the flow meter sends an alarm signal to the oil well RTU through the wireless signal transmitter. Step S14: After receiving the alarm signal, the oil well RTU transmits the alarm signal to the monitoring backend and sends a control signal to the electric valve to adjust the working state of the electric valve to manual control. Oil reservoir fracturing control methods Step S2: Install the flow meter, electric valve and pressure gauge on the water injection well process pipeline respectively, and connect the flow meter, electric valve and pressure gauge to the oil well RTU. Step S21: Set the electric valve to automatic control mode and connect the oil well RTU to the monitoring backend via RS485 cable; Step S22: Set the alarm threshold of the pressure gauge. When the pressure gauge detects that the oil layer pressure exceeds the threshold, it sends an alarm signal to the oil well RTU through the signal transmitter. In step S23, after receiving the alarm signal, the oil well RTU transmits the alarm signal to the monitoring backend and sends a control signal to the electric valve to adjust the valve opening and control the electric valve's working state to manual control.

[0014] (III) Beneficial Effects This invention provides a field control device and method for a water injection well flow meter. It allows for the installation of a flow meter, an electric valve, and a pressure gauge on the water injection well pipeline for monitoring and control. The flow meter, electric valve, and pressure gauge are connected to the well's RTU (Remote Control Unit) to transmit data to the monitoring backend, and the electric valve is controlled via the RTU. When the flow meter reads zero, it automatically times the flow and issues an alarm signal upon reaching an alarm time threshold, switching the electric valve from automatic to manual control to prevent indefinite opening due to flow meter blockage. Similarly, when the pressure gauge detects that the reservoir pressure exceeds a set threshold, it automatically issues an alarm signal, adjusting the electric valve's opening to prevent reservoir rupture due to excessive pressure, and switching the electric valve from automatic to manual control, thereby improving the safety of the water injection well operation. Attached Figure Description

[0015] Figure 1 This diagram illustrates the structure of a field control device for a water injection well flow meter according to the present invention. Figure 2 This invention provides a flowchart of a flow meter jamming control method for a field control device for a water injection well flow meter according to the present invention. Figure 3 The diagram shows a flow chart of an oil layer fracture control method for a field control device for a water injection well flow meter according to the present invention.

[0016] Wherein: 1: Flow meter; 2: Electric valve; 3: Pressure gauge; 4: Oil well RTU. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "inner," "outer," "top," and "bottom" are based on the orientations or positional relationships shown in the accompanying drawings. They are intended only to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the components referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] like Figure 1-3 As shown, the present invention provides a field control device for a water injection well flow meter, comprising: a flow meter 1 and an electric valve 2; The flow meter 1 and the electric valve 2 are respectively installed on the water injection well process pipeline. The flow meter 1 is installed at the water inlet end of the water injection well process pipeline, and the electric valve 2 is installed at the water outlet end of the water injection well process pipeline. This can effectively reduce the interference of changes in the liquid flow state in the pipeline caused by the operation of the electric valve 2 on the measurement results of the flow meter 1. The flow meter 1 can record and transmit the flow data of the water injection well more stably and accurately, which helps to achieve precise control and management of the water injection well.

[0020] The water injection well process pipeline is equipped with a pressure gauge 3, which is located at the lower end of the electric valve 2. The flow meter 1, the electric valve 2, and the pressure gauge 3 are respectively connected to the oil well RTU4. The oil well RTU4, as the core equipment for field control, is responsible for collecting data from the flow meter 1, the electric valve 2, and the pressure gauge 3 and performing preliminary processing and analysis. The oil well RTU4 is connected to the monitoring backend. The monitoring backend includes a PC host and a display module. The PC host is responsible for receiving and storing data transmitted from the oil well RTU4 and running monitoring software to process the data. The display module is used to intuitively display the real-time data monitored by the flow meter 1, electric valve 2 and pressure gauge 3.

[0021] The flow meter 1 includes an excitation device, a magnetic sensor, a data processor, and a wireless signal transmitter. The excitation device is used to generate a stable magnetic field inside the water injection well process pipeline. The flow meter 1 is installed on the water injection well process pipeline. When water flows through the flow meter 1, the magnetic field generated by the excitation device interacts with the water flow, generating an induced electromotive force in the water flow. The magnitude of the induced electromotive force is proportional to the speed of the water flow. Therefore, the flow rate can be indirectly determined by measuring the induced electromotive force. The magnetic sensor is responsible for detecting the induced electromotive force in the water flow, and the data processor is responsible for converting the induced electromotive force signal detected by the magnetic sensor into actual flow data.

[0022] The electric valve 2 includes a valve, an electric motor, an actuator, and a signal receiver. The valve is a ball valve with good sealing performance and corrosion resistance, and can work stably for a long time in harsh environments such as high pressure and high temperature. The actuator is connected to the electric motor, which provides power to the actuator. The actuator is responsible for converting the rotational motion of the electric motor into the opening and closing action of the valve. The signal receiver is used to receive control commands from the oil well RTU4, enabling the electric valve 2 to achieve stable data exchange with the oil well RTU4.

[0023] The pressure gauge 3 includes a pressure sensor and a signal transmitter. The pressure sensor is the core component of the pressure gauge 3 and is used to directly sense pressure changes in the oil layer. To ensure the accuracy of the measurement, the lower end of the pressure sensor is directly inserted into the oil layer, which can capture the pressure changes inside the oil layer in real time. The signal transmitter is responsible for wirelessly transmitting the data collected by the pressure sensor to the oil well RTU4. Through wireless transmission, the pressure gauge 3 can easily exchange data with the oil well RTU4 without laying additional cables, reducing the system's installation and maintenance costs. When the pressure sensor detects a pressure change in the oil layer, it immediately transmits this data to the signal transmitter. After receiving the data, the signal transmitter sends it to the oil well RTU4 wirelessly. The oil well RTU4 performs preliminary processing and analysis on the received data, and then transmits the data to the monitoring backend via wired or wireless network.

[0024] The following is a detailed description of the actual working scenario of a field control device for a water injection well flow meter.

[0025] The field control device for the water injection well flow meter, when used to control flow meter blockage faults, includes the following steps: Step S1: Install flow meter 1, electric valve 2 and pressure gauge 3 on the water injection well process pipeline, and ensure that the distance and position between each device meet the design requirements. Use wireless communication to connect flow meter 1, electric valve 2 and pressure gauge 3 to oil well RTU4 to ensure the stability and reliability of data transmission. Step S12: Set the electric valve 2 to automatic control mode so that it can automatically adjust the valve opening according to the data of flow meter 1 and pressure gauge 3. Use RS485 cable to connect the oil well RTU4 to the monitoring backend to ensure that the monitoring backend can receive and process the data from the oil well RTU4 in real time. Step S13: Set the alarm time threshold for flow meter 1 in the oil well RTU4 to 120 seconds. When the value collected by flow meter 1 is 0, the system starts timing. If the value of flow meter 1 returns to a non-zero value before the alarm time threshold is reached, the timer is reset. If the value of flow meter 1 is still 0 after the alarm time threshold is reached, flow meter 1 sends an alarm signal to the oil well RTU4 via a wireless signal transmitter. In step S14, after receiving the alarm signal from the flow meter 1, the oil well RTU4 immediately transmits the alarm signal to the monitoring backend and displays the alarm information on the display module. At the same time, the oil well RTU4 sends a control signal to the electric valve 2 to switch the working state of the electric valve 2 from automatic control to manual control, so that the operator can check and handle it.

[0026] The field control device for the water injection well flow meter, when used to control oil reservoir rupture faults, includes the following steps: Step S2: Install flow meter 1, electric valve 2 and pressure gauge 3 on the water injection well process pipeline, and ensure that the distance and position between each device meet the design requirements. Use wireless communication to connect flow meter 1, electric valve 2 and pressure gauge 3 to oil well RTU4 to ensure the stability and reliability of data transmission. Step S21: Set the electric valve 2 to automatic control mode so that it can automatically adjust the valve opening according to the data of flow meter 1 and pressure gauge 3. Use RS485 cable to connect the oil well RTU4 to the monitoring backend to ensure that the monitoring backend can receive and process the data from the oil well RTU4 in real time. Step S22: Set the alarm threshold for pressure gauge 3 in oil well RTU4. When pressure gauge 3 detects that the oil layer pressure exceeds the set threshold, it sends an alarm signal to oil well RTU4 via a signal transmitter. In step S23, after receiving the alarm signal from pressure gauge 3, oil well RTU4 immediately transmits the alarm signal to the monitoring backend and displays the alarm information on the display module. Oil well RTU4 sends a control signal to electric valve 2 to reduce the valve opening degree of electric valve 2 by 20% to reduce the oil layer pressure, and switches the working state of electric valve 2 from automatic control to manual control so that the operator can check and handle it.

[0027] It is understood that the various embodiments mentioned above in this invention can be combined with each other to form combined embodiments without violating the principle and logic. Due to space limitations, this invention will not elaborate further.

[0028] Those skilled in the art will understand that, in the above-described method of the specific implementation, the order in which each step is written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0029] This invention provides a field control device and method for a water injection well flow meter. A flow meter 1, an electric valve 2, and a pressure gauge 3 are installed on the water injection well pipeline for monitoring and control. The flow meter 1, electric valve 2, and pressure gauge 3 are connected to an oil well RTU4 to transmit data to the monitoring backend, and the electric valve 2 is controlled via the oil well RTU4. When the flow meter 1 collects a value of 0, it automatically times the time and issues an alarm signal after reaching an alarm time threshold, switching the electric valve 2 from automatic to manual control to prevent it from opening indefinitely due to flow meter 1 blockage. When the pressure gauge 3 detects that the oil layer pressure exceeds a set threshold, it automatically issues an alarm signal, adjusts the opening of the electric valve 2 to prevent oil layer rupture due to excessive pressure, and switches the electric valve 2 from automatic to manual control, thereby improving the safety of the water injection well operation site.

[0030] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A field control device for a water injection well flow meter, characterized in that, include: Flow meter (1) and electric valve (2); The flow meter (1) and the electric valve (2) are respectively installed on the water injection well process pipeline, and the flow meter (1) and the electric valve (2) are placed separately; A pressure gauge (3) is installed on the water injection well process pipeline, and the pressure gauge (3) is located at the lower end of the electric valve (2); The flow meter (1), electric valve (2) and pressure gauge (3) are respectively connected to the oil well RTU (4); The oil well RTU (4) is connected to the monitoring backend.

2. The field control device for the water injection well flow meter according to claim 1, characterized in that, The flow meter (1) includes: an excitation device, a magnetic sensor, a data processor, and a wireless signal transmitting device; The excitation device is used to generate a magnetic field. The flow meter (1) is installed on the water injection well process pipeline. When the water flows through the flow meter (1), the excitation device cooperates with the magnetic sensor to detect the induced electromotive force in the water flow. The data processor converts the induced electromotive force into flow data and transmits it to the well RTU (4) via a wireless signal transmitter.

3. The field control device for the water injection well flow meter according to claim 2, characterized in that, The electric valve (2) includes: a valve, an electric motor, an actuator, and a signal receiver; The actuator is connected to the electric motor, which provides power to the actuator. The actuator is used to control the opening state of the valve, and the signal receiver is used to receive control commands from the oil well RTU (4).

4. The field control device for the water injection well flow meter according to claim 3, characterized in that, The flow meter (1) is located at the inlet end of the water injection well process pipeline, and the electric valve (2) is located at the outlet end of the water injection well process pipeline.

5. The field control device for the water injection well flow meter according to claim 4, characterized in that, The flow meter (1) is placed separately from the electric valve (2) to prevent the liquid turbulence caused by the valve movement in the electric valve (2) from affecting the data of the flow meter (1).

6. The field control device for the water injection well flow meter according to claim 1, characterized in that, The pressure gauge (3) includes: a pressure sensor and a signal transmitter; The lower end of the pressure sensor is located in the oil layer, and the pressure gauge (3) is used to monitor the pressure changes of the oil layer. The pressure gauge (3) transmits the data collected by the pressure sensor to the oil well RTU (4) via a signal transmitter, and then the oil well RTU (4) sends it to the monitoring backend.

7. The field control device for the water injection well flow meter according to claim 1, characterized in that, The monitoring backend includes a PC host and a display module.

8. The control method of the field control device for the water injection well flow meter according to any one of claims 1-7, characterized in that, include: Flowmeter jamming control method Step S1: Install the flow meter (1), electric valve (2) and pressure gauge (3) on the water injection well process pipeline respectively, and connect the flow meter (1), electric valve (2) and pressure gauge (3) to the oil well RTU (4); Step S12: Set the electric valve (2) to automatic control mode and connect the oil well RTU (4) to the monitoring backend via RS485 cable; Step S13: Set the alarm time threshold of the flow meter (1). When the value collected by the flow meter (1) is 0, the timer starts. After the alarm time threshold is reached, the flow meter (1) sends an alarm signal to the oil well RTU (4) through the wireless signal transmitter. In step S14, after receiving the alarm signal, the oil well RTU (4) transmits the alarm signal to the monitoring backend and sends a control signal to the electric valve (2) to adjust the working state of the electric valve (2) to manual control. Oil reservoir fracturing control methods Step S2: Install the flow meter (1), electric valve (2) and pressure gauge (3) on the water injection well process pipeline respectively, and connect the flow meter (1), electric valve (2) and pressure gauge (3) to the oil well RTU (4); Step S21: Set the electric valve (2) to automatic control mode and connect the oil well RTU (4) to the monitoring backend via RS485 cable; Step S22: Set the alarm threshold of the pressure gauge (3). When the pressure gauge (3) detects that the oil layer pressure exceeds the threshold, it sends an alarm signal to the oil well RTU (4) through the signal transmitter. In step S23, after receiving the alarm signal, the oil well RTU (4) transmits the alarm signal to the monitoring backend and sends a control signal to the electric valve (2), adjusts the opening of the valve in the electric valve (2), and controls the working state of the electric valve (2) to manual control.

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