Control system suitable for unconventional oil and gas discharge and production

Abstract

The invention relates to the technical field of oil and gas exploitation, in particular to a control system suitable for unconventional oil and gas discharge and exploitation. The control system comprises an electric actuator, a frequency conversion cabinet, an electromagnetic flowmeter and an underground pressure gauge; the electric actuator is provided with a main controller, the electric actuator is electrically connected with a valve of a gas pipeline, and the main controller is used for controlling the opening degree of the valve through the electric actuator; a fluid metering unit is integrated in the electric actuator and used for collecting gas data of gas passing through the valve. An electromagnetic flowmeter is electrically connected to the exterior of the electric actuator and is used for collecting the water flow of water passing through the waterway pipeline; the exterior of the electric actuator is electrically connected with an underground pressure gauge, and the underground pressure gauge is used for collecting underground pressure data; and a frequency conversion cabinet is electrically connected outside the electric actuator and is used for changing frequency according to an instruction of the main controller. According to the scheme provided by the invention, unconventional oil and gas extraction can be stably carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploitation, and particularly relates to a control system suitable for unconventional oil and gas production and drainage. Background Art

[0002] Currently, the control system for unconventional oil and gas production and drainage generally takes a frequency conversion cabinet as the center, and connects downhole pressure gauges, casing pressure gauges, electromagnetic flowmeters, gas flowmeters, electric actuators, and frequency converters to the frequency conversion cabinet for data acquisition and equipment control. There are two major drawbacks to this solution. First, the frequency converter is a large interference source and may interfere with the communication between devices. Second, considering costs, an additional main controller is required for data processing. Summary of the Invention

[0003] An embodiment of the present invention provides a control system suitable for unconventional oil and gas production and drainage, which can stably carry out unconventional oil and gas production and drainage.

[0004] An embodiment of the present invention provides a control system suitable for unconventional oil and gas production and drainage, including an electric actuator, a frequency conversion cabinet, an electromagnetic flowmeter, and a downhole pressure gauge;

[0005] The electric actuator is installed with a main controller. The electric actuator is electrically connected to a valve of a gas pipeline. The main controller is used to control the opening degree of the valve through the electric actuator;

[0006] A fluid metering unit is integrated inside the electric actuator. The fluid metering unit is used to collect gas data of the gas passing through the valve, and transmit the collected gas data to the main controller to calculate the gas flow rate;

[0007] The electric actuator is externally electrically connected to an electromagnetic flowmeter. The electromagnetic flowmeter is used to collect the water flow rate of the water passing through a water pipeline, and transmit the collected water flow rate to the main controller;

[0008] The electric actuator is externally electrically connected to a downhole pressure gauge. The downhole pressure gauge is used to collect downhole pressure data, and transmit the collected pressure data to the main controller;

[0009] The electric actuator is externally electrically connected to a frequency conversion cabinet. The frequency conversion cabinet is used to change the frequency according to the instruction of the main controller.

[0010] In a possible design, the fluid metering unit includes a casing pressure gauge, a thermometer, and a differential pressure gauge.

[0011] In a possible design, the electric actuator is externally electrically connected to the frequency conversion cabinet, the electromagnetic flowmeter, and the downhole pressure gauge respectively through a 485 bus.

[0012] In a possible design, the outside of the electric actuator is electrically connected to the frequency conversion cabinet, the electromagnetic flowmeter, and the downhole pressure gauge respectively through a 4-20 mA current signal.

[0013] In a possible design, the frequency conversion cabinet is used to collect its operation data in real time for safety monitoring of the control system.

[0014] In a possible design, the operation data includes output frequency, output voltage, output current, output torque, output power, frequency converter operation status, and frequency converter fault code.

[0015] In a possible design, the frequency conversion cabinet is used to control the speed of the motor connected thereto by changing the frequency, and the motor is used to control the oil and gas production and drainage efficiency.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] In this embodiment, the fluid metering unit that is easily interfered by the frequency conversion cabinet is integrated into the electric actuator equipped with the main controller. With such an arrangement, the fluid metering unit is far away from the frequency conversion cabinet, so that each sensor in the fluid metering unit operates stably. The electric actuator is integrated with the main controller, and the main controller is electrically connected to the frequency conversion cabinet, the electromagnetic flowmeter, and the downhole pressure gauge outside it, and then receives the second flow rate and downhole pressure collected by the electromagnetic flowmeter, and generates a frequency conversion instruction according to the received data to control the frequency conversion cabinet to change the frequency, completing the control of unconventional oil and gas production and drainage. The entire system does not require an additional main controller, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of a control system suitable for unconventional oil and gas production and drainage provided by an embodiment of the present invention.

[0020] In the figure:

[0021] 1 - Electric actuator;

[0022] 2 - Frequency conversion cabinet;

[0023] 3 - Electromagnetic flowmeter;

[0024] 4 - Downhole pressure gauge;

[0025] 5 - Valve. Detailed implementation mode

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] In the description of the embodiments of the present invention, unless otherwise clearly specified and defined, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; unless otherwise specified or stated, the term "plural" means two or more; the terms "connection", "fixation", etc. shall be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the description of this specification, it should be understood that the orientation terms such as "upper" and "lower" described in the embodiments of the present invention are described from the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of the present invention. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0029] As Figure 1 shown, the embodiments of the present invention provide a control system applicable to unconventional oil and gas production drainage, including an electric actuator 1, a frequency conversion cabinet 2, an electromagnetic flowmeter 3 and a downhole pressure gauge 4;

[0030] The electric actuator 1 is equipped with a main controller. The electric actuator 1 is electrically connected to a valve 5 of a gas pipeline. The main controller is used to control the opening degree of the valve 5 through the electric actuator 1;

[0031] A fluid metering unit is integrated inside the electric actuator 1. The fluid metering unit is used to collect gas data of the gas passing through the valve 5 and transmit the collected gas data to the main controller to calculate the gas flow rate;

[0032] The electric actuator 1 is externally electrically connected to an electromagnetic flowmeter 3. The electromagnetic flowmeter 3 is used to collect the water flow rate of the water passing through the water pipeline and transmit the collected water flow rate to the main controller;

[0033] The electric actuator 1 is externally electrically connected to a downhole pressure gauge 4. The downhole pressure gauge 4 is used to collect downhole pressure data and transmit the collected pressure data to the main controller.

[0034] The electric actuator 1 is externally electrically connected to a frequency conversion cabinet 2. The frequency conversion cabinet 2 is used to change the frequency according to the instruction of the main controller.

[0035] In this embodiment, the fluid metering unit that is easily interfered by the frequency conversion cabinet 2 is integrated into the electric actuator 1 equipped with the main controller. With this setting, the fluid metering unit is far away from the frequency conversion cabinet 2, so that each sensor in the fluid metering unit operates stably. The electric actuator 1 is integrated with a main controller, and the main controller is electrically connected to the external frequency conversion cabinet 2, electromagnetic flowmeter 3 and downhole pressure gauge 4. Then, it receives the second flow rate and downhole pressure collected by the electromagnetic flowmeter 3, and generates a frequency conversion instruction according to the received data to control the frequency conversion cabinet 2 to change the frequency, completing the control of unconventional oil and gas drainage. The entire system does not require an additional main controller, saving costs.

[0036] In this embodiment, the downhole pressure gauge 4 collects the downhole pressure, which can directly reflect the current pressure value of the liquid, and the pressure value can also be converted into the corresponding liquid column height. The main controller in the electric actuator 1 controls the frequency output of the frequency conversion cabinet 2 according to the drainage algorithm. The electromagnetic flowmeter 3 can monitor the current flow rate of the discharged liquid, and thus monitor the liquid discharge capacity of the pump.

[0037] In some embodiments of the present invention, the fluid metering unit includes a casing pressure gauge, a thermometer and a differential pressure gauge.

[0038] In this embodiment, the casing pressure gauge, thermometer and differential pressure gauge respectively collect the casing pressure, gas temperature and the pressure difference between two measurement points. The main controller realizes the monitoring of gas flow rate through a certain algorithm according to the collected various data.

[0039] In some embodiments of the present invention, the electric actuator 1 is externally electrically connected to the frequency conversion cabinet 2, electromagnetic flowmeter 3 and downhole pressure gauge 4 respectively through a 485 bus.

[0040] In some embodiments of the present invention, the electric actuator 1 is externally electrically connected to the frequency conversion cabinet 2, electromagnetic flowmeter 3 and downhole pressure gauge 4 respectively through a 4-20mA current signal.

[0041] In some embodiments of the present invention, the frequency conversion cabinet 2 is used to collect its operating data in real time for safety monitoring of the control system.

[0042] In some embodiments of the present invention, the operating data includes output frequency, output voltage, output current, output torque, output power, inverter operating status, inverter fault code.

[0043] In this embodiment, the transportation data is used to monitor the drainage and production conditions. When the monitored data exceeds the set protection parameters, the system gives an alarm or shuts down, and the equipment is protected to the greatest extent to operate in a normal working environment.

[0044] In some embodiments of the present invention, the frequency conversion cabinet 2 is used to control the rotational speed of the motor connected thereto by changing the frequency, and the motor is used to control the oil and gas drainage and production efficiency.

[0045] In this embodiment, the frequency conversion cabinet 2 can control the rotational speed of the motor by changing its frequency. The motor is used to provide power for the oil and gas drainage and production, thereby realizing the control of the oil and gas drainage and production efficiency.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A control system applicable to the drainage and production of unconventional oil and gas, characterized in that, It includes an electric actuator (1), a frequency conversion cabinet (2), an electromagnetic flowmeter (3) and a downhole pressure gauge (4); The electric actuator (1) is equipped with a main controller. The electric actuator (1) is electrically connected to a valve (5) of a gas pipeline. The main controller is used to control the opening degree of the valve (5) through the electric actuator (1); A fluid metering unit is integrated inside the electric actuator (1). The fluid metering unit is used to collect gas data of the gas passing through the valve (5) and transmit the collected gas data to the main controller to calculate the gas flow rate; The electric actuator (1) is externally electrically connected to an electromagnetic flowmeter (3). The electromagnetic flowmeter (3) is used to collect the water flow rate of the water passing through a water pipeline and transmit the collected water flow rate to the main controller; The electric actuator (1) is externally electrically connected to a downhole pressure gauge (4). The downhole pressure gauge (4) is used to collect the pressure data underground and transmit the collected pressure data to the main controller; The electric actuator (1) is externally electrically connected to a frequency conversion cabinet (2). The frequency conversion cabinet (2) is used to change the frequency according to the instruction of the main controller.

2. The control system according to claim 1, wherein The fluid metering unit includes a casing pressure gauge, a thermometer and a differential pressure gauge.

3. The control system according to claim 1, wherein The electric actuator (1) is externally electrically connected to the frequency conversion cabinet (2), the electromagnetic flowmeter (3) and the downhole pressure gauge (4) respectively through a 485 bus.

4. The control system according to claim 1, wherein The electric actuator (1) is externally electrically connected to the frequency conversion cabinet (2), the electromagnetic flowmeter (3) and the downhole pressure gauge (4) respectively through a 4 - 20mA current signal.

5. The control system according to claim 1, characterized in that The frequency conversion cabinet (2) is used to collect its operation data in real time for safety monitoring of the control system.

6. The control system according to claim 5, characterized in that, The operation data includes output frequency, output voltage, output current, output torque, output power, inverter operation status, and inverter fault code.

7. The control system according to claim 1, characterized in that, The frequency conversion cabinet (2) is used to control the speed of the motor connected to it by changing the frequency. The motor is used to control the oil and gas production and drainage efficiency.

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