Coupling Fluid-Flow and Geomechanics in Dual-Porosity Modeling of Naturally Fractured Reservoirs
Coupling Fluid-Flow and Geomechanics in Dual-Porosity Modeling of Naturally Fractured Reservoirs
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DOI：
10.2118/38884-ms
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
Her-Yuan Chen;L. Teufel
中科院分区：
文献类型：
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作者：
Her-Yuan Chen;L. Teufel
本研究的目的是制定一个耦合的流体流动/地质力学模型的天然裂缝性油藏。流体流动是在双孔隙度（更一般地说，双孔隙度连续体）概念的背景下建模，而地质力学建模遵循毕奥的等温，线性孔隙弹性理论。发展遵循沿着传统的和现有的多孔流体流动模拟的路线。因此，保留了常用的系统流体流动建模。我们展示了如何将传统的流体流动双孔隙度配方扩展到耦合流体流动/地质力学模型。双重连续体、裂缝和基质块体的孔隙体积变化的解释以及相关的有效应力规律是最困难和最关键的耦合考虑因素。提出了描述双重岩石体积变化的新关系。这些关系允许单孔隙度和双孔隙度概念之间的平滑和一致的过渡，并且是在可测量的量方面。简化为单一孔隙度，以证明所提出的模型的概念一致性。
The purpose of this study is to formulate a coupled fluid-flow/geomechanics model of a naturally fractured reservoir. Fluid flow is modeled within the context of dual-porosity (more generally, overlapping-continuum) concept while geomechanics is modeled following Biot's isothermal, linear poroelastic theory. The development follows along the line of the conventional and existing porous fluid-flow modeling. The commonly used systematic fluid-flow modeling is therefore preserved. We show how the conventional fluid-flow dual-porosity formulations are extended to a coupled fluid-flow/geomechanics model. Interpretation of the pore volumetric changes of the dual continua, fractures and matrix-blocks, and the associated effective stress laws are the most difficult and critical coupling considerations. New relations describing the dual rock volumetric changes are presented. These relations allow a smooth and consistent transition between single-porosity and dual-porosity concepts and are in terms of measurable quantities. Reduction to the single-porosity is presented to demonstrate the conceptual consistency of the proposed model.