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《Natural Gas Industry》 2008-07
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THE BOUNDARY ELEMENT METHOD FOR PRESSURE TRANSIENT ANALYSIS OF DEFORMED MEDIA RESERVOIR

HE Ying-fu1,GAO Hui-mei2,LIU Xian-gui3,YANG Zheng-ming3(1 Post-doctoral Research Center of PeroChina Daqing Oilfield Company;2 Exploration and Development Research Institute of PeroChina Daqing Oilfield Company;3 Institute of Porous Flow and Fluid Mechanics,Chinese Academy of Sciences).  
The numerical solution is the only method for analyzing bottom hole pressure in deformed media reservoir with arbitrary shape.The commonly-used numerical methods are finite difference method,finite element method and boundary element method.The first two methods have disadvantages of more limitations and poorer adaptability for solving mathematical models,while the boundary element method can just take the mesh generation of regional boundaries,having the advantages of less computation efforts and storage space,as well as dimension reduction,so as to process the border issue of complex shape very effectively.In this paper,by using the boundary finite element method to solve the mathematical model of unstable seepage flow in impermeable area of deformed media reservoir with arbitrary shape,the reservoir pressure of any point can be obtained.Thus,with the consideration of permeability variation coefficient,complex boundary and reservoir storage,the typical curve of unstable pressure in bottom hole is drawn.Then by analyzing curve features,it is found that the impermeable area in reservoirs has significant influence on the later stage shape of pressure typical curves,speeding the upwarping moment of pressure derivative curve.The study provides a theoretical basis for the pressure-sensitivity gas reservoir well test analysis.
【Fund】: 国家自然科学基金(编号:10672187)的资助
【CateGory Index】: TE311
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