Design of Energy-saving Monitoring System for Electric Pump Well in Oilfield

Design of Communication and TV Oilfield Electric Pump Well Energy Saving Monitoring System ZHANG Shude, DONG Jing 2, WANG Helong 2 (1. Shengli Oil Production Plant Technical Supervision Section, Shandong Dongying 257000, China); 2. Shandong Lichuang Technology Co., Ltd., Shandong Caijing 271100, China) Electric pump well energy saving monitoring system design plan. It is of great significance to improve the automation management and control level, economic benefits, and product quality of the oil production plant.

With the development of oilfields and the improvement of industrial automation, a new technology has emerged to serve oilfield oil recovery, namely the use of modern data acquisition technology for the development of EDA90 series modules and systems composed of computers for long-distance oil production equipment, oil production data Monitoring and acquisition.

Electric pump wells are important facilities for oilfields to ensure high production and stable production of crude oil. Whether electric pump wells can play an important role will play a crucial role in the production of crude oil from the oil fields. At present, the operating conditions of equipment are regularly checked by each person and the oil production data are measured and counted. Due to the large number of oil wells and their distribution range from tens to hundreds of square kilometers, this method will inevitably increase the labor intensity of workers and affect the real-time and accuracy of equipment monitoring and oil production data.

Therefore, the automation and informationization of the oil field are extremely prominent.

The system discussed in this article is based on the view that current field monitoring and operating systems based on computer and GPRS wireless data radios can greatly increase oilfield production efficiency, reduce overall costs, and automate and informatize oilfield production and management. In order to achieve this goal, it is necessary to develop a reliable oilfield monitoring and operating system based on microcomputer technology and modern communication technology, develop new and inexpensive oilfield operation monitoring methods, and develop user-accessible databases and recording systems.

1 Overall System Requirements The purpose of this system is to achieve an integrated system optimization of electric pumps. Mainly real-time detection of wellhead parameter data, timely detection of electric pump well operation failure, and quickly ruled out, shorten oil well troubleshooting time, improve the open time rate, increase crude oil production; achieve electric pump wells in the frequency conversion closed-loop regulation, reasonable matching pumping Absorb parameters, improve system efficiency; realize intelligent compensation for power factors of electric pump wells, increase power factor, and reduce energy consumption.

To achieve voltage, current, power, power factor, power, frequency, wellhead back pressure, wellhead temperature and other parameters measured and achieve remote automatic transmission.

The wellhead controller has the functions of calculating the parameters such as active power, reactive power, power factor, and power consumption.

Monitor and alarm abnormal conditions such as the shutdown of the electric pump well, excessive voltage or undervoltage, overcurrent or underload current, and high or low pressure at the wellhead.

A comprehensive integrated optimization information platform for the electric pump well system of the oil production plant was established, and energy-saving optimization and remote monitoring of the electric pump well system of the entire plant were conducted systematically and systematically.

The system aims to achieve field data collection of electric pump well system parameters, automatic and efficient operation optimization, energy saving, and remote automatic monitoring. Set parameters monitoring, optimization, automatic adjustment, alarm, record, report printing, operation protection and operation set in one, accurate, rapid, efficient and convenient to achieve automatic management of the electric pump, improve the electric pump's management level.

2 System Design 21 Design Principles The system design follows the basic principles of “advancement, practicality, and reliability”. It adopts a distributed secondary network thread to optimize the structural design, adopts a high starting point technology as a standard, and is convenient for operation and reliable operation. , And according to the following principles design and selection.

The system center station uses high-performance and high-reliability servers, workstations, and supporting equipment.

The communication method adopts advanced GPRS communication method. As long as the GPRS can cover the place, it can ensure that the system communication is normal.

The system adopts the reliability design, and realizes high-reliability design of the system in terms of hardware redundancy and software fault-tolerance. The hardware watchdog technology is adopted to ensure the safe operation of the system.

The system adopts a modular structure and sets a reserved interface for future function changes.

The hardware system adopts all-optical isolation measures to improve the system's anti-collapse performance.

2.2 Communication Methods The system uses GPRS data communication. GPRS is a new type of communication method and is affiliated to China Mobile Communications Corporation. It has features such as real-time on-line, metered billing, and efficient transmission. It uses the mobile company's network thread for data transmission, so its reliability and resistance to backing up is very high. The limitation is that the data traffic needs to be paid to the network operator. If the data volume is not large, the cost relatively low.

Communication and TV lines are transmitted according to the number of people. 2.3 System Components The monitoring computer is a stable and reliable computer. It is usually placed in a protective box that meets the requirements of the National Association of Electronic Manufacturers. 8 hours of uninterrupted power supply.

The main function of the central monitoring computer system is to monitor oilfield operations and store each well's data in a way that facilitates access. It enables users to obtain “quasi-real-time” data for each well through GPRS data transmission, and can also be based on ordinary predictions. The specific experience of the method or individual wells develops specialized software to analyze the data for each well. These analytical work can provide information on the effectiveness of existing operations and identify those problems that may arise. In turn, this information can be used to increase production efficiency and develop workover operations plans. Other functions of the central operating computer also include data for the preparation of routine monthly production reports. The monitoring terminal SU functional block diagram is shown.

The workstation monitoring computer system is mainly used to store and display the recorded data. The data is pooled by oil wells and made into a table so that the operation of the well system can be quickly checked. At the same time, a detailed review of historical data for each sensor for a given well is performed. The alarm conditions determined and reported by the wellhead microcomputer are stored in a specific format, alerting and recognizing the operator. Well team monitoring computers typically store each well's data for three weeks for real-time access by operators. The central monitoring computer conducts several data retrievals daily from the well team monitoring computer through a conventional telephone modem. Single well data is kept in the computer for about 30 days. Then, convert all relevant data for each well to a floppy disk for long-term storage.

According to the different parameters collected, select the appropriate sensor. Including temperature, pressure, flow and so on.

24 System Structure The system consists of data acquisition, data collection, and data application. The system structure is as shown.

The on-site installation of SU equipment and related sensor equipment in production wells is the field equipment for data acquisition and processing of the entire monitoring system. The device periodically collects telemetering, remote messaging information or receives each monitoring module (SM) to the data center, and monitors the terminal for data communication. SU equipment has a self-test function, finds equipment failures, sends information to factory data centers and team monitoring terminals immediately; plant data centers regularly check the online status of communication modules, finds various types of information, receives and responds at any time from the oil monitoring terminal The command. It has the functions of remote monitoring of on-site remote monitoring, remote data transmission and remote control of the system.

The SU equipment is equipped with a GPRS communication module, and its data communication with the SU acquisition equipment adopts an RS232/RS485 interface. The SU equipment sends the information to the team monitoring terminal in real time through the GPRS communication module.

The on-site acquisition parameters of each electric pump well are transmitted to the plant data center real-time database through the utility communication data network (GPRS). The system's data center is located at the oil production plant. According to the distribution of the oil field and the distribution of wells managed by the oil production plant, the plant data center can be set according to the division of the oil production plant.

Real-time data collected at the scene is then transmitted to the relevant grass-roots unit through the oilfield LAN. The shutdown and alarm information is transmitted to the team monitoring area in the relevant responsible area.

3 The software design requires that the electric pump well SU realizes the measurement of parameters such as voltage, current, power, power factor, electric quantity, frequency, well back pressure, and wellhead temperature, and realizes remote automatic transmission; the SU equipment at the wellhead has motor active power, reactive power, Power factor, power consumption and other parameters calculation function; detection and alarm of abnormal conditions such as electric pump well stop, voltage over voltage under voltage, current over current and under load, well head back pressure too high and low.

The oil production team monitor can only query the working status, real-time data and related communication module working status of the team's oil wells according to the management authority; according to the monitoring of electric pump well working conditions, the electric pump well is always operated in the high-efficiency area through frequency conversion optimization control and adjustment. , To achieve the purpose of energy saving; oil production team through the real-time database of production wells to implement the Chang production management, to generate class reports, reports, annual reports to provide some basic data for the oil field development database to provide basic data for the entire mining area of ​​the oil company The production dynamics analysis provides the basis for technical personnel to provide technical analysis data, provides decision-making basis for decision-making, and provides basic data for realizing on-site production remote management and scheduling.

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