Multiple fracturing of horizontal well in shale gas productivity factors numerical simulation researching

Shale gas is an important kind of unconventional energy, having highly the potential resources and a long developing time etc. Currently, it only has been successful exploited in the United States and Canada. As the poor reservoir property, natural low pressure and difficult development characteristics etc in shale gas, the business development of shale gas relies on horizontal drilling and fracturing technology breakthrough. Horizontal well multiple fracturing technique can form fracture network, increase the seeping area, reduce the flow resistance and improve the productivity of horizontal well, enhance the shale gas production effective, obtain industrial development successful. In this paper, we use the coalbed methane(CBM), double medium module in Eclipse numerical simulation software to establish mathematical model, to investigate the relationship between fracture system and productivity in shale gas reservoir. The permeability on fracture system, fracture conductivity, fracture spacing, fracture half length and the number of fracture have the impact on the capacityof horizontal well after fracturing. It can effectively optimize and guide multiple fracturing in shale gas horizontal well construction and forecast capacity.