Optimization of horizontal well multistage fracturing in offshore gas reservoirs

Offshore hydraulic fracturing is characterized by limited fracking treatment size and high operation cost, hence reasonable fracture parameters under limited hydraulic fracturing scale play a key role in fracturing design. In this paper, a new method for optimization of the fracture parameters of offshore gas reservoirs was put forward, and according to this method, the optimum fracture parameters of horizontal well under different fracturing stages of the same sand volume were obtained after assessment of platform deck fracturing capacity. In addition, fracturing stages were optimized according to the prediction of productivity and evaluation of economy; therefore, an integrated optimization method considering fracturing parameters, reservoir characteristics, and economic factors was established. By utilizing this method, the optimum design for gas well P1H in DFF 1-1 Gas field was obtained with five optimum fractures, with an optimum fracture length of 98.6 m and an optimum fracture width of 7.8 mm.