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基于动态渗透率效应的低渗透油藏产能新观点 被引量:8

New viewpoint of productivity on low permeability reservoir based on dynamic permeability effect
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摘要 目前,常用拟启动压力梯度方法来处理低渗透低速渗流阶段的非达西线性渗流规律,但这种方法存在一定的不合理性;而动态渗透率效应模式能很好地反映低渗透油藏的渗透率及其对应的拟启动压力梯度随驱替压力梯度的变化。据此,用差分法,得到了一种新的油井压力与产量计算方法。动态渗透率效应对产量影响较大,通过与传统的达西和带启动压力梯度方法计算结果对比,认为动态渗透率效应渗流模式方法计算的压力从井底到油藏边界分布较匀缓,产量指示线为靠近坐标原点的曲线;而启动压力梯度方法的非达西线性渗流压力主要消耗在井筒附近,产量指示曲线为不过坐标原点的直线。文中得出的压力和产量结果均介于2种传统方法之间,与新模式原理完全吻合,渗流模式和结论更可靠。 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.
出处 《断块油气田》 CAS 北大核心 2011年第4期482-485,共4页 Fault-Block Oil & Gas Field
基金 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
关键词 低渗透油藏 动态渗透率效应 差分法 产能 启动压力 low permeability reservoir dynamic permeability effect difference method productivity threshold pressure
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