Part One: Introduction Dynamic monitoring of oil extraction, storage, and transportation processes, especially the storage and transportation of refined oil products, is a crucial aspect of production management and a vital means of ensuring the normal, safe, and economical operation of oilfields. In developed Western countries, SCADA (Supervisory Control and Data Acquisition) has become an integral part of production infrastructure. With advancements in human technology and the application of advanced technologies, real-time dynamic monitoring of oil pipelines has become possible. The main contents of dynamic monitoring include monitoring for pipeline and well leaks, overpressure protection, abnormal temperatures, and excessive water content. Oilfields are often referred to as "factories without walls," with wells, gathering and transportation stations, and combined stations scattered across remote areas. The entire oil production process is interconnected through pipelines, forming a pressure system where a small disruption can have far-reaching consequences. Pipeline and well leaks are particularly frequent, causing significant economic losses and environmental pollution to oilfield units. Therefore, achieving dynamic monitoring of the oilfield production system is of great significance for timely detection of leaks and other faults, optimization of production operating parameters, reduction of oil theft, and improvement of the modernization level of oilfield management. Part Two: Introduction to GPRS Networks GPRS, short for General Packet Radio Service, is a new bearer service developed on the existing GSM system. Its purpose is to provide packet-based data services to GSM users. GPRS uses the same radio modulation standard, frequency band, burst structure, frequency hopping rules, and TDMA frame structure as GSM. This new packet data channel is extremely similar to the current circuit-switched voice service channel, therefore existing base station subsystems (BSS) can provide comprehensive GPRS coverage from the outset. GPRS allows users to send and receive data in end-to-end packet-switched mode without utilizing the network resources of circuit-switched mode. This provides an efficient and low-cost wireless packet data service. It is particularly suitable for intermittent, bursty, and frequent small-volume data transmissions, and also for occasional large-volume data transmissions. Compared to the circuit-switched data transmission method of the original GSM dial-up system, GPRS is a packet-switched technology with advantages such as "real-time system online," "pay-per-use," "convenient and quick login," "high-speed data transmission," and "seamless switching." The third part, the GPRS wireless network oilfield pipeline monitoring system, utilizes advanced domestic remote monitoring technology. It's a hardware and software platform integrating computer technology, mobile communication technology, network communication technology, database technology, and testing technology. This system employs digital mobile communication technology, transforming the traditional analog signal transmission structure and introducing mobile communication technology to achieve wireless communication between the main unit and sub-units. It features dynamic monitoring of oilfield pipeline data, leak monitoring, high pressure protection, temperature anomaly alarms, water content exceeding limits, and remote information transmission. Furthermore, it develops and researches expanded functions such as comprehensive analysis of collected data. This provides a basis for scientific facility management, improves the scientific utilization rate of equipment, and achieves energy-saving and consumption-reducing targets. It provides dynamic monitoring of pipelines and oil wells, including leak monitoring, high pressure protection, temperature anomalies, and water content exceeding limits. With oil wells, gathering and transportation stations, and combined stations scattered across remote areas, and the entire oil production process connected by pipelines forming a pressure system, the situation is highly interconnected. To address this, we designed a GPRS wireless network solution for data acquisition and remote transmission of field parameters for oilfield pipelines. This solution enables multi-point, remote, real-time, and synchronous data transmission from the field, facilitating convenient, fast, economical, reliable, and secure distributed centralized monitoring and control of oilfield pipelines. (I) System Description: The entire remote monitoring system, as shown in the diagram above, consists of three parts: the field acquisition and control section, the GPRS data transmission section, and the monitoring room data center. Data interaction with the GPRS DTU is completed through the control module. The PLC (acquisition device) periodically sends data to the GPRS DTU, while simultaneously receiving data from the GPRS DTU in real time to perform corresponding control functions. Upon receiving data from the PLC, the GPRS DTU immediately forwards it to the data center. (1) The PLC in each station collects various information parameters in real time and sends the data to the GPRS DTU communication module through the RS-485 serial communication module; at the same time, it can also receive instructions from the monitoring center through the communication module. (2) When configuring the GPRS DTU communication module, the fixed IP address of the data center is pre-entered. After receiving the data sent by the PLC, the GPRS DTU communication module sends the data to the network server with the IP address set in advance, and forwards it to the data center server through port mapping. The process of GPRS DTU sending data is as follows: the data is sent to the China Mobile GPRS network, then through the Internet, and finally received in the data center through ADSL. (3) The monitoring room data center consists of an ADSL MODEM, a network server, a firewall, a data center server, and workstations. The data center server receives data from each station through the ADSL Modem and performs data storage, historical trend analysis, report printing, etc. (II) Main System Functions • Remote Automatic Monitoring Function: Collects, statistically analyzes, and automatically generates various reports and charts based on user requirements, establishing and storing historical archives for each oilfield station; • Fault Alarm and Notification Function: Monitors on-site conditions and reports to the management center, notifying management personnel to handle the situation; • Telemetry Function: Measures leakage monitoring, high pressure protection, abnormal temperature, excessive water content, and anti-theft measures at various oilfield stations within the jurisdiction from the data management center; • Remote Control Function: Controls on-site equipment via I/O, such as starting pumps, depressurizing, implementing safety protection devices, alarms, and power cut-off; Part Four: TD-8600 RS485/422 to GPRS Wireless Data Transmission DTU Product Features The TD-8700S RS485 to GPRS converter, a wireless data transmission terminal (GPRS DTU), provides a transparent data transmission channel for various sensors, intelligent devices, and industrial control equipment with RS-232 and RS-485 standard communication interfaces. Users don't need to understand the complex principles of GPRS communication and TCP/IP protocols, nor do they need to modify existing programs to instantly convert the serial communication of industrial RS232/485 serial devices to GSM/GPRS wireless network communication. This transforms traditional serial communication into GPRS wireless network communication. The TD-8700S features a built-in TCP/IP protocol stack for transparent data transmission. It does not interpret or process data packets uploaded or sent by the device; it only performs TCP/UDP data packet encapsulation and decapsulation on user data packets, thus achieving transparent data transmission. It is widely used for long-distance wireless communication or remote control. >>Product Features: 1. Easy to use, flexible, reliable, and with a configuration and maintenance interface. 2. Compliant with GSM/GPRS communication standards, supports virtual private data networks. 3. Data terminal is always online, with transparent data transmission and protocol conversion. 4. Supports point-to-point, point-to-multipoint, and multipoint-to-center data transmission, as well as short message backup channels. 5. One RS232 serial port, supports RS-232/485, with a built-in GPRS module. 6. Anti-interference design, suitable for applications in harsh electromagnetic environments. 7. Routing and Virtual Address Translation (NAT) services for wireless, real-time, and high-volume data communication. 8. The control end does not require multi-user cards, modems, or similar devices; only internet access is needed. 9. Low-end serial port devices can quickly connect wirelessly and communicate with large volumes of data. 10. Communication performance depends on the construction of the GSM/GPRS network. 11. Advantages include stable data communication, fast data transmission speed, and large data volume. 12. Single-trip time < 1 second, speed up to 40 kbit/s. 13. Program settings are available via HyperTerminal, similar to AT commands, allowing for flexible configuration of communication parameters. 14. Supports multiple host discovery methods including static IP, domain name, and SMS IP discovery. >> Technical Parameters: ◆ TCP/IP Protocol Stack Support: TCP, UDP, FTP, SOCKET, TELNET, POP3, SMTP, HTTP ◆ Antenna Interface: 50Ω/SMA female connector ◆ Data Transmission Method: Fully transparent data transmission ◆ Supported Parameter Settings: TCP client, TCP server, UDP, device transparent transmission, etc. ◆ UIM Card: 3V ◆ Serial Data Interface: RS-232 or RS-485 ◆ Serial Data Interface Rate: 300 to 115,200 bits/s ◆ Functional Modes: Automatic redial function upon disconnection, power-saving mode ◆ Device Power Consumption: Approximately 120mA in standby mode; approximately 300mA in transmission mode, ranging from 200mA to 480mA ◆ Operating Temperature: -10～+50℃ Storage temperature: -20～+75℃ ◆ Relative humidity: 95% (non-condensing) ◆ Power supply: +5V ◆ Operating temperature: -20℃ ～ +70℃ ◆ Quality guarantee: Three years >> Application areas: Widely used in building automation control, parking equipment network control, traffic network control, PLC control and management, POS machine networking, LED screen control, factory, workshop, mine, bank, oil field monitoring, electrical, marine communication, and other RS-232/485 equipment networking applications, etc., in remote control fields. Part 5 System Solution A. Public Network Solution The center uses a server group as the central receiver. The center uses ADSL or other public Internet connection, using a fixed public IP or a dynamic public IP + DNS resolution service. This solution first applies for broadband services such as ADSL from the Internet operator. 1) Fixed public IP of the center: The monitoring points directly initiate the connection to the fixed public IP of the center. Reliable and stable operation, this solution is recommended. (Fixed IP addresses are relatively expensive) 2) Central Public Network Dynamic IP + DNS Resolution Service: Most IPs are dynamic and relatively inexpensive. The monitoring point first connects to the DNS server using domain name addressing, and then the DNS server finds the central public network dynamic IP and establishes a connection. This method can greatly save on the cost of fixed public IP addresses, but its stability is limited by the stability of the DNS server, so a reliable DNS service provider must be found. B. Private Network Solution 1. Based on the special network security requirements of the customer's internal network, it was decided to use the dedicated APN form of China Mobile's GPRS network for network access: The information center is connected to the mobile company's GPRS network through a 2M dedicated line. The routers of both parties use private IP addresses for wide area connection. A dedicated APN is allocated to the customer through a GRE tunnel between the GGSN and the mobile company's interconnecting router. Ordinary users are not allowed to apply for this APN. SIM cards used for GPRS private networks only have this dedicated APN activated, restricting the use of other APNs. Customers can set up their own RADIUS server and DHCP server. The GGSN provides the user's calling number to the RADIUS server, using an authentication method combining the calling number and user account. After authentication, the user is assigned a static IP address within the enterprise by the DHCP server. End-to-end encryption: End-to-end encryption is used between the mobile terminal and the server platform to prevent potential information leakage during transmission. Both parties are isolated by firewalls, with IP address and port filtering performed on the firewalls. 2. The process for a GPRS private network system terminal to access the internet and log in to the server platform is as follows: 1) The user sends a GPRS login request, which includes the private network APN specifically allocated by the mobile company for the GPRS private network system; 2) Based on the APN in the request, the SGSN sends a query request to the DNS server to find the GGSN connected to the enterprise server platform, and encapsulates the user request through a GTP tunnel and sends it to the GGSN; 3) The GGSN sends the user authentication information (including mobile phone number, user account, password, etc.) to the Radius for authentication via a dedicated line; 4) The Radius authentication server sees the authentication information such as the mobile phone number, confirms that the request is from a legitimate user, and requests the DHCP server to allocate a user address; 5) After successful Radius authentication, the Radius sends a confirmation message carrying the user address to the GGSN; 6) The user obtains an IP address and can then access the GPRS private network system information query and service processing platform by carrying data packets. Part Six Conclusion GPRS-based wireless data systems have a wide range of applications. GPRS has brought the internet into the wireless realm, extending all the way to mobile phones. In addition to supporting traditional internet applications, GPRS also enables wireless terminals to support B2B and B2C e-commerce, electronic payments, stock trading, bank transfers, and other applications. GPRS can also be applied to corporate intranets (INTRANET), enabling IP-based remote LAN access and making wireless terminals an extension of the LAN. Almost all low-speed data transmission services can be used, such as in power system automation, industrial monitoring, traffic management, meteorology, finance, environmental monitoring, coal mines, oil fields, and securities industries.