【摘要】 格子玻尔兹曼方法(lattice Boltzmann method,LBM)是模拟页岩气微观渗流的一种重要方法,能够在孔隙尺度上比较精确地模拟页岩气的多种渗流机理,但是该方法模拟尺度小,计算量大,限制了其在储层尺度上的渗流模拟和在产能预测中的应用。为了既能保留LBM的模拟精度,又能快速准确地模拟较大尺度渗流,将LBM和有限差分方法相结合形成一种新方法,进行页岩气的升尺度渗流模拟。该新方法同时具有LBM的模拟精度和较快的运算速度,适用于模拟页岩气在宏观尺度的渗流和产能预测。利用新方法进行渗流模拟可得,滑脱效应和气体解吸能提高气体流动速度,补充地层能量,从而提高气井产量。更多还原

【Abstract】 The lattice Boltzmann method(LBM) is one of the important methods to simulate the micro-percolation of the shale gas, which can precisely simulate the multiple flow mechanisms of the shale gas in the scale of the pore. However the simulated scale of the method is rather smaller, the calculation work is huge, and moreover its applications in the reservoir-scale flow simulation and production prediction are restricted. In order to keep the simulation precision of the LBM and rapidly and accurately simulate the large-scale flow, the LBM was coupled with finite difference method to simulate the upscaling flow of the shale gas. The new method can both has the LBM simulation precision and pretty faster calculation, so this method can be adopted in the simulation of the shale gas flow in the macro-scale and the prediction of the productivity. The flow simulation by this new method shows that the slippage effect and gas desorption can speed up the gas flow and add the formation energy, thus the gas well production can be enhanced finally.更多还原