On May 10, 2016, our company won another maritime battle - Dynamic riser installation project of Enping 23-1 oilfield group. The installation operation is carried out online under the production status of FPSO offshore oil 118. The air diving operation is constructed by the Underwater Engineering Department of the company, and the FPSO heading control is undertaken by the maritime service department. The unity officers and construction directors of each operation face. It is said that it is the first case in China that aPL single point mooring FPSO completes the pulling operation in dynamic riser installation without release and slip ring displacement.

The narrow space of underwater construction angle is one of the difficulties in project operation. The routing orientation of the dynamic riser to be installed is 285 °, and the included angle between its adjacent 9# anchor cable (324 °) is 39 °. In order to facilitate the diver's underwater operation and safe operation, and ensure that the incident angle and output angle of the lifting wire rope laid by the dynamic riser do not interfere with the original anchor cable, the FPSO heading shall be controlled at 210 ° - 220 ° during air diving operation. At this time, the air submersible support ship is located in the included angle area between the dynamic riser and 9# anchor cable, and the incident angle of the lifting wire rope laid by the dynamic riser is about 300 °, The actual underwater working surface of air diving operation is only about 15 °.

During the operation, offshore oil 118 encountered the urgent situation of full load, crossflow, thunderstorm weather and force interface of level 7 cross wind at the same time. The bow control group guided the oil tanker, tugboat and other relevant parties to be on duty and deal with calmly. FPSO always maintained the pre-designed direction and angle, which effectively ensured the safety of underwater construction.