Abstract: In order to reduce the production loss caused by production shutdown during the cleaning and internal inspection of crude oil storage tanks,an offshore production and storage platform（P platform） uses a leased mobile test production platform（H ship） as a temporary production and storage facility. Through production process optimization and operational risk analysis,the production process and instrument control logic of the P platform and H ship have been upgraded,realizing non-stop production operations. The platform adopts a systematic management method,takes oilfield rescue and escape capabilities,safety and environmental protection requirements,and material supply cycles as constraints,and uses Gantt charts to control the operation process,achieving the completion of all operations 12 days in advance.

Key words: crude oil storage tank, non-stop production cleaning, project control, Gantt chart