The Similar Structure Of The Solution For The Seepage Model Of The Three Medium Shale Gas Reservoir

In view of the limitation of the traditional double medium model of shale gas reservoir in describing the process of shale gas flow.In this paper,the micro cracks are introduced into the dual media model,and the matrix system is divided into organic matrix system and non organic matrix system.By combining the physical and the percolation mechanism of shale gas reservoir,the percolation model of shale gas are established without considering the adsorption desorption respectively.Based on the Laplace transform and similar structure theory,the quasi pressure at the bottom hole with similar structure in Laplace space is obtained.Stehfest numerical inversion method is used to inverse the bottom hole pressure to the real space,and then to draw the characteristic curves and analyze the influence of the main control parameters on the characteristic curves.On the basis of this,the percolation model is established to consider the phenomenon of adsorption desorption.The creative method of similar structure in oil and gas reservoir is not only to simplify the calculation process of oil and gas reservoir seepage model,but also to provide a new direction and new idea for the development and preparation of the related well test analysis software.The micro cracks are introduced into shale percolation model,and the matrix is divided into organic and non organic matter.The improvement of the traditional model will make the percolation model more in line with the actual seepage process of shale gas,thus greatly improving the accuracy and practicability of the model.