Optimization method of fracture network fracturing in deep shale with natural fracture groups:a case study of Well LH-7 in southern Sichuan Basin
The development of natural fractures in deep shale gas blocks in sounthern Sichuan Basin varies greatly,and phenomena such as severe fliter loss and inter-well pressure channeling during fracturing are prone to occur,which have a significant impact on the fracture network fracturing effect of shale gas wells.Carrying out the simulation of fracturing fracture network propagation under the influence of natural fractures and optimizing fracture network fracturing parameters according to the characteristics of natural fracture groups in deep shale layers can reduce the adverse effects caused by natural fractures,which is conducive to the improvement of fracturing effects,the reduction of construction risks,and the increase of the ultimate recovery of gas wells.In this study,a fracturing fracture network propagation model under the development of deep shale natural fracture groups was constructed,the diagrams of the optimal design of fracturing in well sections with developed natural fracture groups were drawn and the fracturing parameter optimization design process of well sections with developed fractures was proposed,taking Well LH-7 in southern Sichuan Basin as an example.Through fracturing fluid variable viscosity and displacement fracture network fracturing design,the total fracturing fluid volume of that well increased by 0.75％,the fracture network volume increased by 14％,and the construction efficiency of the fracture network increased by 13％,showing remarkable optimization effects.
deep shalenatural fracture groupfracture network fracturing designvariable viscosity and displacement
NETL
NSTL
万方数据
