Research And Design Of The Seawater Injection Supervisory And Control System On The Oil Platform

The main content of this dissertation is the design and research of the seawater injection automation system on the oil platform. At ChengDao oil field, seawater injection is a main method in oil extraction, but it is difficult to improve the water quality. Because ChengDao oil field is located at the sea entrance of the Yellow River, much impurity is suspended in the seawater in this sea area. Affected by the monsoon, tide and the quantity of the Yellow River, the seawater quality varies much in the different season.Based on the research of the seawater at ChengDao oil field and the seawater injection techniques on the ChengDao 2 platform, this thesis designs the supervisory and control system for the seawater injection system on the ChengDao 2 platform. This system is based on the programmable controller and DH+ network (data high way plus network), and it can supervise and control the whole flow of the seawater injection. As the primary device in the system, programmable controller implement the flex logic control for the flow and can collect the data in the flow to establish the control center. In the dissertation, the HMI (human machine interface) designed by configuration software can display the status of the equipments on the computer screen, so the operator can supervise the flow in the control center. After the automation system began to run in 10, 2001, the whole seawater injection flow can be supervised all the time, and the water quality has been improved to eligible degree. At the same time, the management is ameliorated greatly, and the cost is decreased. The system keeps ahead in the seawater injection system in China, and it gives the example of the design of the seawater injection system at the shallow sea oil field.This dissertation is also focused on the research and design of fuzzy control system. It applies the fuzzy control theory on the drag adding system. Put drag system is a very important system in the seawater injection system. Based on the research of the seawater quality around the ChengDao 2 platform, the dissertation gives the way to design the fuzzy control system for the drag adding process. It can be predicted that the fuzzy control system can make great effect to improve the seawater quality.