Shale Gas Gas-solid Coupling Research With Finite Element Method

Shale gas is a kind of unconventional natural gas resources with great reserves, it has characteristics of high calorific value, clean, low pollution and has become the focus of the resources countries around the world race to develop. Shale gas is changing the world’s energy consumption structure, exploration and utilization of shale gas has a significant impact on the development of world economy and global climate change. In this paper, based on the basic theory of migration and finite element method, I establish a shale gas gas-solid coupling math ematical model and give a decoupling method and then prepare the finite element simulatior of shale gas gas-solid coupling. This paperthe has made these progress.First of all, based on the characteristics of the shale gas reservoir porous media,combining with the relevant mechanics involved in the process of shale gas flow and seepage theory, shale gas solid coupling mathematical model is established in this paper.Then based on the basic principle of finite element method, this paper gives shale gas solid coupling numerical method and establishs shale gas gas-solid coupled finite element methd simulator.Finally this paper simulates different types of vertical well fracturing and staged fracturing using this simulator, and gives the corresponding fracture network subdivision graph, stress distribution and gas dynamic graph. This part is more intuitive to present under the coupled action of gas-solid fracturing process and provide guidance foractual fracturing of the production process.