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《Fault-Block Oil & Gas Field》 2011-04
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New viewpoint of productivity on low permeability reservoir based on dynamic permeability effect

Liu Shun1,He Heng2,Zhang Huaguang2 (1.College of Petroleum Engineering,Xi′an Shiyou University,Xi′an 710065,China;2.Research Institute of Oil and Gas Technology,Changqing Oilfield Company,PetroChina,Xi′an 710021,China)  
Now pseudo threshold pressure gradient method is usually used to deal with the non-Darcy linear flow of low permeability reservoir at low-speed flow stage.But the method is unreasonable to a certain extent.Dynamic permeability effect mode can reflect the change of the permeability of low permeability reservoir and corresponding pseudo threshold pressure gradient with displacement pressure gradient.A new method of calculating well pressure and productivity is obtained by finite difference method.Dynamic permeability effect affects the production rate greatly.Compared the calculated results of traditional Darcy method with threshold pressure gradient method,it is believed that the pressure,calculated by dynamic permeability effect flow mode method,distributes evenly from bottom hole to reservoir boundary.The indicating curve of production is the curve near the zero point of coordinate.Non-Darcy linear flow pressure with threshold pressure gradient method is consumed mainly near wellbore and the indicating curve of production is the straight line that does not pass the zero point of coordinate.The calculated results of pressure and production rate,based on the method used in this paper,vary between two traditional methods,which are in agreement with the principle of new mode.The seepage mode and conclusion are more reliable.
【Fund】: 国家科技支撑计划课题“延长油区低渗-超低渗油藏复杂结构井开采工艺技术研究与示范”(2008ZX05013);; 博士科研启动项目“低渗透油藏幂律非线性渗流的应用”(Z09130)资助
【CateGory Index】: TE348
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