Abstract: The closed drainage system of offshore oil and gas production facilities is an important oil-water separation equipment,which is mainly used to treat oil-water mixed liquids from upstream separators. The power system structure of the facility is analyzed,the control circuit is redesigned for the control requirements of the closed drainage pump,and the spare drawer is selected for wiring and component installation. The communication program is redesigned to realize the reliable transmission and execution of the control signal of the closed drainage pump. The closed discharge pump was tested after the transformation,and the whole transformation work was completed. By independently designing and installing the communication program and relay control circuit of the closed discharge pump,the problems in the power supply system of the closed discharge pump were solved.

Key words: offshore oil and gas production facilities, closed discharge system, power supply system transformation, communication system transformation