A new method of determining relationship between permeability and effective overburden pressure for low-permeability reservoirs
A new method of determining relationship between permeability and effective overburden pressure for low-permeability reservoirs
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发表时间：
2007
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通讯作者：
Zhu Hua-yin
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作者：
Zhu Hua-yin
低渗透岩心在有效覆盖层压力增大过程中表现出应力敏感性。提出了一种确定应力敏感系数的新方法。通过室内物理模拟实验，推导了应力敏感系数与初始渗透率的关系。结果表明，该方法确定的应力敏感系数不受试验数据个数的影响，也与最大围压无关。渗透率与有效覆盖层压力之间的关系可以用双幂函数表示。利用该双幂函数可以方便地确定储层条件下的岩心渗透率，计算非均质储层在开发过程中的渗透率变化，为建立低渗透储层渗流模型提供了依据。
The low-permeability cores show stress sensitivity during the effective overburden pressure increasing.A new method of defining stress sensitivity coefficient was presented.The relationship between stress sensitivity coefficient and initial permeability was deduced by physical modeling experiment in room.The results show that the stress sensitivity coefficient defined by this new method is not affected by the numbers of testing data and no related to the maximum confining pressure.The relationship between permeability and effective overburden pressure can be expressed by a dual-power function.By this dual-power function,the core permeability in reservoir condition can be determined conveniently,and variation of permeability of heterogeneous reservoirs can be computed during the process of development,which provides a basis to establish percolation model for low-permeability reservoirs.