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NAPLC Integrated Station Control Solution
Release date:
2020-03-27
The Oilfield Combined Station is a critical gathering and processing hub in the oilfield production process, primarily responsible for the centralized collection, separation, treatment, and temporary storage of the mixed fluids produced from oil wells (including crude oil, water, natural gas, and more). After treatment, the qualified crude oil is then transported to the next stage. Serving as the vital link between well production and crude oil export, it is an essential facility that enables efficient, automated operations in the oilfield.
The oilfield joint station has the following features:
The system is large in scale, with positions scattered across various locations.
The integrated station houses numerous subsystems, including the stabilization station, team-metering station, inventory management system station, wastewater treatment system station, filter-tank system station, crude oil recovery system station, fire protection system station, and boiler system station—each functioning as an independent operational unit. Some of these stations are physically dispersed over a wide area, with certain ones located hundreds of meters away from the central monitoring room, thereby placing significant demands on signal transmission and system integration.
Security requirements are high; independent operation is necessary.
Some positions (such as stable roles) have stringent requirements for system security and reliability, making them suitable for independent operation. If a single The CPU centrally controls the entire integrated station, which not only makes later maintenance difficult but also poses systemic safety risks. Therefore, it is more appropriate to adopt a system architecture with independent control for multiple substations, enabling each operational unit to run independently. This approach ensures that maintenance or failures at one substation will not disrupt the normal operation of other systems.
Large-scale data collection, limited communication
Some positions require collecting vast amounts of data, handling a significant volume of it. RS485 instruments (such as multifunctional electricity meters). Limited by the fact that Profibus can only transmit 244 bytes of data between a single slave station and the master station, these applications often require splitting into multiple Profibus sub-stations, making them unsuitable for a distributed IO structure based on Profibus. Currently, common sub-station devices (like Siemens' ET200 series) cannot be expanded with CPUs that have independent control capabilities, making it difficult to achieve true local control. Even when certain models do support this feature, their control capacity remains severely limited.
Oilfield Integrated Station Plan
After gaining a deeper understanding of the overall operational patterns of the integrated station, we have also familiarized ourselves with the control system design for the Qingdong No. 5 Integrated Station, which was just put into operation this year. Combining this knowledge with the features of Nantai Aoto NA400 PLC, we now present a comprehensive control system solution tailored specifically for the integrated station. Notably, the system features an internal Ethernet communication scheme connecting the master station to its substations, enabling each substation to operate independently. Additionally, two configurations are available: single-network and dual-network solutions.
1. A single-network solution with one central station and multiple branch stations:
Features: Each substation is equipped with a single-network PLC CPU (CPU401-0301), whose Ethernet port connects via Ethernet cables or fiber optic cables to a multi-port switch located in the main station cabinet, forming a star topology. The central station features a PLC Ethernet master module (CMM401-0205) that links directly to the substation units. This Ethernet module’s network port is connected—via Category 5e twisted-pair cables—directly to the same switch.
2. A dual-network architecture featuring one central station and multiple branch stations:
Features: Each substation is equipped with a PLC featuring a dual-network CPU (CPU401-0401). The CPU has two Ethernet ports, each connected via either a pair of network cables or fiber optic cables. These connections converge into a star topology at the main station cabinet, where two multi-port switches are installed. Additionally, the central station is outfitted with a PLC Ethernet master module (CMM401-0205), whose two Ethernet ports are directly linked—via Category 5e twisted-pair cables—to the aforementioned two switches.
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Company Headquarters: No. 15, Building B, Zone B, Phase I, Headquarters Economic Park, 69 Fengzhan Road, Yuhuatai District, Nanjing, Jiangsu, P.R. China
Production Center: No. 219 Qinghuiting West Road, Jiangning Economic Development Zone, Nanjing City, Jiangsu Province
Aoto Technology Co., Ltd.
