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Decline Curve Analysis in a Naturally Fractured Reservoir with a Finite-Conductivity Fault

机译:具有有限导电故障的天然裂缝储层中的曲线分析

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An analytical solution for constant producing pressure conditions for a well near a nonintersecting finite-conductivity fault, of infinite length in a naturally fractured reservoir, is presented. The solutions for the dimensionless flow rate are based on a model presented by Abaszadeh and Cinco-Ley. In this work the model was extended to include constant producing pressure in infinite systems. Flow along and across the fault plane is considered. It is demonstrated that a graph of Ddf D t vs q for long times produces a straight line with slope -1/4, it is proportional to sqroot F_(CD) . Type curves in terms of fault conductivity and diffusivity ratios are presented. Finally, a field pressure-buildup test and production history data from a faulted reservoir that exhibit characteristics predicted by the analytical model are analyzed. The results show that the initial decline could be a key factor in deciding when to change or abandon a well, and for a practical viewpoint, given an initial value to the flow rate, it is important to know the time required to deplete the system composed by the naturally fractured reservoir and the finite conductivity fault.
机译:提出了一种用于恒定产生的恒定压力条件的分析解决方案,其在自然裂缝储存器中的无限长度附近的孔的孔。无量纲流速的解决方案基于Abaszadeh和Cinco-Ley提出的模型。在这项工作中,模型扩展到包括无限系统中的恒定产生压力。考虑沿着故障平面的流动。据证明,DDF D T VS Q的图表长时间产生直线与斜率-1/4,它与SQROOT F_(CD)成比例。提出了在故障导电性和扩散比率方面的类型曲线。最后,分析了来自分析模型预测的特征的断层储层的现场压力 - 积累测试和生产历史数据。结果表明,初步下降可能是决定何时改变或放弃井的关键因素,并且对于初始值为流速的初始值,了解耗尽系统所需的时间非常重要通过自然裂缝储层和有限电导率故障。

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