Data acquisition and control system and method for intelligent intermittent well site in gas field

Abstract

The invention discloses a data acquisition and control system and method for a gas field intelligent intermittent well site. The system comprises an upper management system, a well site RTU and a plurality of well site detection and control devices. Wherein each detection and control device is connected to a well site RTU; each detection and control device comprises an intelligent electric switch well valve and a control module group; the control module group comprises a pressure transmitter, a flow meter, an emergency cut-off valve, a plunger arrival sensor, alcohol injection equipment and foam drainage equipment; the intelligent electric switch well valve is used for uploading the detected data of the control module group to the well site RTU and sending an instruction issued by the well site RTU to the control module group; and the well site RTU is used for uploading data of the control module group and receiving an instruction issued by the upper management system. The workload of field operation, management, maintenance and system upgrading and reconstruction is reduced, the labor intensity of personnel is reduced, and the standardized design degree of a control program is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas field surface engineering construction, and in particular relates to a data acquisition and control system for an intelligent well field in a gas field, and also relates to a data acquisition and control method for the system. Background Art

[0002] The data acquisition and control system of a natural gas well site is generally composed of a controller (RTU) and various instrument transmitters to complete the data acquisition and monitoring of the well site process production process. In recent years, as the gas production of production gas wells has decreased rapidly, the production capacity of most gas wells in the middle and late stages of production must rely on drainage gas production technology. The drainage gas production processes such as intermittent and bubble drainage, which account for a large proportion, require a large number of wellhead switching operations. Therefore, an intelligent well site construction suitable for intermittent switching wells and a supporting data acquisition and control system have been formed. The RTU collects data including electric switching well valves, plunger arrival sensors, oil pressure, casing pressure, flow meters, etc. The RTU is set with various control strategies for the full life cycle of gas wells, such as intermittent gas production and plunger drainage, to achieve intelligent intermittent control.

[0003] However, this data acquisition and control system has certain shortcomings: the intelligent well-opening site involves a large number of control strategies and data volumes, and various control strategies are integrated in the RTU. Due to the different numbers of wells in different types of wells, the control program cannot be standardized. Every time a set of equipment that needs to be controlled by the host computer is added to the well site, such as electric needle valves, pneumatic diaphragm valves, plungers, and automatic injection, it is necessary to read the on-site data and develop the valve control program module on the existing well site RTU, which makes on-site operation, management, and maintenance difficult. In summary, the workload of on-site operation and maintenance in the intelligent well site of gas fields is currently large, and the degree of standardized design of the control program needs to be further optimized. Summary of the invention

[0004] The present invention provides a data acquisition and control system and method for an intelligent well field in a gas field, solving the problems that the workload of on-site operation and maintenance in the intelligent well field in a gas field is large and the degree of standardized design of the control program needs to be further optimized.

[0005] The technical solution provided by the present invention is:

[0006] The data acquisition and control system of the intelligent well field of the gas field includes an upper management system, a well field RTU, and detection and control equipment of several well fields; wherein each detection and control equipment is connected to the well field RTU; each detection and control equipment includes an intelligent electric switch well valve and a control module group; the control module group includes a pressure transmitter, a flow meter, an emergency shut-off valve, a plunger arrival sensor, an alcohol injection device, and a bubble discharge device; the well field RTU establishes communication with the upper management system; each intelligent electric switch well valve establishes communication with the control module group of its corresponding well field; the intelligent electric switch well valve also establishes communication with the upper management system, the well field RTU, and the control module group of its corresponding well field.

[0007] The present invention is also characterized in that:

[0008] The intelligent electric on-off well valve is an integrated device consisting of an electric actuator, a regulating valve and an intelligent controller.

[0009] Intelligent electric switch well valve is used for:

[0010] Receive data uploaded by the control module group and independently control the control module group;

[0011] The data to be monitored among the data uploaded by the receiving control module group is transmitted to the well site RTU, and the instructions issued by the well site RTU are received and sent to the control module group.

[0012] The well site RTU is used to: summarize the data uploaded by the intelligent electric switch well valve and upload it to the upper management system; receive the control instructions of the upper management system and send them down to the intelligent electric switch well valve.

[0013] Each intelligent electric switch well valve is connected to the well site RTU through a cable, and the control module group of each gas well is connected to the intelligent electric switch well valve of the gas well through a cable.

[0014] Each intelligent electric switch well valve is respectively connected to the well site RTU and the transmission signal adopts the standard RS485MODBUS forrtu protocol; the data transmission signals of the control module group also adopt the standard RS485MODBUS for rtu protocol.

[0015] The pressure transmitter includes an oil pressure transmitter and a casing pressure transmitter. The data transmission signals of the oil pressure transmitter and the casing pressure transmitter adopt 4-20mA analog quantity.

[0016] Based on this system, data collection and control of the intelligent well site of the gas field include the following steps:

[0017] Step 1: The control module group of each well site collects data and transmits it to the intelligent electric switch well valve of its well site:

[0018] Step 2: After analyzing the data, the intelligent electric switch well valve transmits the data that needs to be uploaded to the upper management platform to the well site RTU through the standard RS485 MODBUS signal. The well site RTU summarizes the data and forwards it to the upper management system. The upper management system sends a control instruction to the well site RTU after analysis and processing. The well site RTU transmits the control instruction to the intelligent electric switch well valve, and the intelligent electric switch well valve sends the control instruction to the control module group;

[0019] The intelligent electric switch well valve is independently controlled, and after data analysis and processing, the control instructions are sent to the control module group.

[0020] The present invention has the following beneficial effects: the present invention provides a data acquisition and control system and method suitable for an intelligent intermittent well field in a gas field, reduces the difficulty of operation and maintenance of the data acquisition and control system, and the intermittent switching well control program of each single well is completely consistent, without considering operation and maintenance for different types of wells.

[0021] The present invention reduces the workload of RTU expansion and upgrading during well site reconstruction. The control program of each single well is completely embedded in the edge of the single well. Only the signal of the newly added single well controller connecting to the RTU reserved terminal is completed on site. There is almost no need for program modification and upgrading, and the workload is small.

[0022] The module of the present invention has a built-in processor to form an integrated intelligent electric switch valve, which also has the functions of data collection, processing and switching wells of other equipment. The equipment has a high degree of integration, reduces the workload of on-site installation land and cable laying, and has a small maintenance workload.

[0023] The present invention improves the standardized design level of the well site data acquisition and control system, and further enhances the intelligence level of the well site. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the system architecture of the data acquisition and control system and method of the intelligent inter-well field of the gas field of the present invention. DETAILED DESCRIPTION

[0025] The data acquisition and control system for the intelligent well site of a gas field of the present invention will be further described in detail below with reference to the accompanying drawings and in combination with specific implementation methods.

[0026] like Figure 1 As shown, the data acquisition and control system of the gas field intelligent inter-well field of the present invention, the well field RTU, and the detection and control equipment of several well fields; wherein each detection and control equipment is connected to the well field RTU; each detection and control equipment includes an intelligent electric switch well valve and a control module group; the control module group includes a pressure transmitter, a flow meter, an emergency shut-off valve, a plunger arrival sensor, an alcohol injection device, and a foam discharge device

[0027] In Example 1, the data of the pressure transmitter, flow meter, emergency shut-off valve, plunger arrival sensor, alcohol injection equipment and bubble drainage equipment are collected and transmitted to the intelligent electric switch well valve. The data of the pressure transmitter adopts the standard 4-20mA analog quantity, and the data of the flow meter, emergency shut-off valve, plunger arrival sensor, alcohol injection equipment and bubble drainage equipment adopt the standard RS485MODBUS signal.

[0028] Example 2, the intelligent electric switching well valve is an integrated device composed of an electric actuator, a regulating valve and an intelligent controller. The intelligent electric switching well valve is embedded with an intelligent intermittent switching well control strategy. Through the collected data of the pressure transmitter, flow meter, emergency shut-off valve, plunger arrival sensor, alcohol injection equipment, and bubble drainage equipment, the valve opening is independently controlled to achieve high-quality exploitation of the gas well.

[0029] Example 3, an intelligent electric on-off well valve, whose computing power satisfies the sampling operation of oil pressure not less than 50 times / second, is embedded with a standardized intermittent on-off well control strategy for a single well; it collects data from pressure transmitters, flow meters, emergency shut-off valves, plunger arrival sensors, alcohol injection equipment, and bubble drainage equipment to achieve a variety of control functions such as single well opening liquid flow rate tracking, plunger single liquid production metering, valve core anti-freezing and blocking.

[0030] At the same time, customized valve opening control strategies can be implanted according to requirements; the intelligent electric switch well valve only transmits the data that needs to be uploaded to the upper management system to the upper management platform through the standard RS485 MODBUS signal.

[0031] The upper management system cancels the programs related to the intermittent well switching control strategy, and is only responsible for the collection and processing of production data in the well site that needs to be uploaded to the upper management platform. Based on the data, it sends it to the intelligent electric switching well valve through the well site RTU. The intelligent electric switching well valve controls the control module group according to the instruction.

[0032] Embodiment 4, as Figure 1 As shown, in the data acquisition and control system of the intelligent well field of the gas field of the present invention, the pressure transmitter is installed with an oil pressure transmitter and a casing pressure transmitter; the oil pressure transmitter and the casing pressure transmitter, the flow meter, the emergency shut-off valve, the plunger arrival sensor, the alcohol injection equipment and the bubble drainage equipment of each gas well are respectively connected with the intelligent electric switch well valve of the gas well by cables, wherein the data transmission signals of the oil pressure transmitter and the casing pressure transmitter adopt 4-20mA analog quantity, and the data transmission signals of the flow meter, the emergency shut-off valve, the plunger arrival sensor, the alcohol injection equipment and the bubble drainage equipment all adopt the standard RS485MODBUSfor rtu protocol; the intelligent electric switch well valves of each gas well are respectively connected with the well field RTU by cables, and the transmission signals also adopt the standard RS485MODBUSfor rtu protocol.

[0033] The wellsite RTU of the data acquisition and control system of the intelligent inter-wellsite of the gas field of the present invention establishes communication with the intelligent electric switch well valve of each single well, only collects data related to production monitoring, and uploads it to the upper management system through the communication link to realize remote monitoring.

[0034] The data acquisition and control system of the intelligent intermittent well field of the gas field of the present invention delegates the intermittent well control strategy to each gas well, realizes edge control, improves the standardized design of the control program, reduces the difficulty of on-site operation and maintenance, and reduces the workload of RTU expansion and program upgrade caused by the expansion of the well field. The present invention reduces the workload of on-site operation, management, maintenance and system upgrade and transformation, reduces the labor intensity of personnel, and improves the standardized design degree of the control program.

Claims

1. The data acquisition and control system of the intelligent well field in the gas field is characterized by: It includes an upper management system, a well site RTU, and detection and control equipment for several well sites; wherein each of the detection and control equipment is connected to the well site RTU; each of the detection and control equipment includes an intelligent electric switch well valve and a control module group; the control module group includes a pressure transmitter, a flow meter, an emergency shut-off valve, a plunger arrival sensor, an alcohol injection device, and a bubble discharge device; the well site RTU establishes communication with the upper management system; each of the intelligent electric switch well valve establishes communication with the control module group of its corresponding well site; the intelligent electric switch well valve also establishes communication with the upper management system, the well site RTU, and the control module group of its corresponding well site.

2. The data acquisition and control system for the intelligent well site of a gas field according to claim 1 is characterized in that: The intelligent electric switch well valve is an integrated device consisting of an electric actuator, a regulating valve and an intelligent controller.

3. The data acquisition and control system for the intelligent well field of a gas field according to claim 2 is characterized in that: The intelligent electric switch well valve is used for: Receive data uploaded by the control module group and independently control the control module group; The data to be monitored among the data uploaded by the receiving control module group is transmitted to the well site RTU, and the instructions issued by the well site RTU are received and sent to the control module group.

4. The data acquisition and control system for the intelligent well field of a gas field according to claim 1 is characterized in that: The well site RTU is used to: summarize the data uploaded by the intelligent electric switch well valve and upload it to the upper management system; receive the control instructions of the upper management system and send them to the intelligent electric switch well valve.

5. The data acquisition and control system for the intelligent well field of a gas field according to claim 1 is characterized in that: Each of the intelligent electric switch well valves is connected to the well site RTU via a cable, and the control module group of each gas well is connected to the intelligent electric switch well valve of the gas well via a cable.

6. The data acquisition and control system for the intelligent well field of a gas field according to claim 1 is characterized in that: Each of the intelligent electric switch well valves is respectively connected to the well site RTU and the transmission signal adopts the standard RS485 MODBUS for rtu protocol; the data transmission signals of the control module group also adopt the standard RS485 MODBUS for rtu protocol.

7. The data acquisition and control system for the intelligent well site of a gas field according to claim 1 is characterized in that: The pressure transmitter comprises an oil pressure transmitter and a casing pressure transmitter, and the data transmission signals of the oil pressure transmitter and the casing pressure transmitter adopt 4-20mA analog quantity.

8. The data acquisition and control system for the intelligent well field of a gas field according to any one of claims 1 to 7, characterized in that: Based on this system, data collection and control of the intelligent well site of the gas field include the following steps: Step 1: The control module group of each well site collects data and transmits it to the intelligent electric switch well valve of its well site: Step 2: After analyzing the data, the intelligent electric switch well valve transmits the data that needs to be uploaded to the upper management platform to the well site RTU through the standard RS485 MODBUS signal. The well site RTU summarizes the data and forwards it to the upper management system. The upper management system sends a control instruction to the well site RTU after analysis and processing. The well site RTU transmits the control instruction to the intelligent electric switch well valve, and the intelligent electric switch well valve sends the control instruction to the control module group; The intelligent electric switch well valve is independently controlled, and after data analysis and processing, the control instructions are sent to the control module group.

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