I. Project Overview
The production informatization project of Jiangyou Operation Area of Northwest Sichuan Gas Field aims to carry out informatization construction and transformation of Jiangyou Operation Area and its subordinate single well stations, central stations and gas gathering and distribution stations, so as to improve the informatization level and management level of Jiangyou Operation Area, and provide data sources for the construction of the gas field DCC and the data platform of Southwest Oil and Gas Field Branch.
The Jiangyou Gas Production Area is located in Jiangyou City, Sichuan Province, and is mainly responsible for the development and management of the Zhongba Gas Field and the supply of gas to 39 users. The Zhongba Gas Field officially commenced production in August 1973. It has two gas reservoirs, Xu'er and Lei'san (Lei'san is a high-sulfur reservoir, containing approximately 110 grams of hydrogen sulfide per cubic meter of natural gas), with recoverable reserves of 186.3 × 10⁸ m³. As of the end of May 2011, cumulative gas production reached 165.2 × 10⁸ m³, representing a recovery rate of 88.7 %. The production area currently has 40 well stations and stations of various types, including 6 gas gathering and distribution stations, 1 Lei'san booster center station, 3 gas gathering stations, 1 water treatment station, 4 water injection stations, 8 sulfur-containing single wells, and 17 non-sulfur-containing wells, with 43 gas production wells (including 1 observation well and 2 inactive wells).
II. System Design
This project combines ForceControl Technology's years of engineering experience in the construction of automation and informatization in oil and gas field production. It realizes the automatic acquisition and transmission of production data from single well stations, gas gathering and distribution stations, and work areas; real-time monitoring and transmission of videos and images; and the function of resuming transmission of production data and video images after disconnection. It realizes the integration of production data and video images at the monitoring layer in the same monitoring system and reserves communication interfaces for DCC production data acquisition and video image transmission.
The communication network adopts a combination of self-built fiber optic and ADSL networks to achieve physical isolation between the production network and the office network, thereby improving the security and reliability of data transmission.
The work area monitoring system, as the core of the gas field's overall monitoring system, provides a complete solution for the highly automated and specialized control systems at various stations. The control system collects various attribute information for remote database management, enabling real-time control, early warning, and forecasting functions. System objectives include:
1) Achieve integrated management of various control systems. The design of the system database and information processing fully consider information sharing and prevention of information redundancy, while ensuring information consistency.
2) Make full use of the latest achievements in computer hardware and software technology and network technology to achieve dynamic management of monitoring data of various control systems.
3) Based on the relevant regulations such as technical specifications, standards, and operating procedures of the gas field, propose qualitative and quantitative parameter setting schemes, establish numerical models, and construct a digital application system for major disaster identification, early warning, and monitoring through mathematical analysis, evaluation, judgment, reminders, alarms, and other technical methods to solve the problems of insufficient coverage of management information, weak compatibility, and lack of functions in the existing system.
4) Enables real-time monitoring and control of the entire production process, with intuitive visualization.
5) To achieve the identification, evaluation, prediction, and forecasting of hazards.
6) To supervise and regulate the behavior of on-site management personnel in the production process, and to plug and prevent loopholes in safety production management, thus achieving "standardized management and accountability to individuals".
7) Based on the monitored parameters, implement classified and graded reporting and alarms.
8) The system has good scalability and can be easily updated and upgraded as needed.
9) The system is easy to operate and has a user-friendly interface. It takes into account both professional needs and interactivity and ease of use.
III. Architecture Design
The system is structured in a three-tiered network architecture: single well station, central station/gathering and distribution station, and work area. Production data and video images from single well stations are uploaded to the central station/gathering and distribution station or directly to the work area via fiber optic or ADSL networks. Production data and video images from the central station/gathering and distribution station are uploaded to the work area via fiber optic or ADSL networks. For overhaul projects, production data and video images from well stations are first uploaded to the server in the work area via a CDMA wireless network, and then transmitted to the data monitoring industrial control computer via Ethernet.
The specific network architecture is shown in the following diagram:
IV. System Functions
4.1 Monitoring screen display
Using the screen configuration tool of eForceCon configuration software from ForceControl Technology, and in accordance with the technical specifications of the Southwest Oil and Gas Field Branch, we created production process screens based on the actual production process diagrams of each site, and displayed real-time data such as temperature, static pressure, and flow rate on the production screens so that operators could view them in real time.
4.2 Production Alarms and Event Logs
The system can display and record various alarm information generated during the current production process in real time, such as alarm information for excessive flow/pressure, abnormal instrument power supply, abnormal valve operation, and communication failure.
In addition, the dispatch center system has strict access control and operation tracking functions, recording all user operation processes and providing a basis and means for investigating system security issues.
4.3 Production Reports
This system collects data on oil pressure, casing pressure, temperature, and flow rate from each individual well and central station, and automatically generates daily production reports, monthly production reports, daily metering reports, and monthly metering reports that conform to the branch company's specifications.
4. Trend Curve
To facilitate operators in viewing and analyzing production trends, this system includes the ability to switch between real-time and historical curves. Operators can also select two or more data points for trend comparison according to their needs, providing a reliable basis for production scheduling.
4, 5 Real-time video and intrusion alarm
Hikvision components are used to view real-time video from the site, and operators can also use software to automatically control the on-site cameras via PTZ to achieve their viewing needs.
Each site is equipped with an intrusion prevention system. When unauthorized personnel intrude into the site, the system will issue an alarm and record video and images of the intrusion.
V. Conclusion
The work area monitoring system, built using eForceCon Server V2.0 software from ForceCon Technology, serves as the core monitoring system for the entire Jiangyou gas production work area project, providing a complete solution for the highly automated and specialized control systems at various stations. This system collects various attribute information for remote database management, enabling real-time control, early warning, and forecasting functions. This simplifies the work of work area dispatchers and significantly improves work efficiency.
