Discussion on a New Methods for the Characterization of the Swelling and Compression in Porous Rocks in Oil and Gas Reservoirs
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摘要: 如何计算多孔介质内的应力，能否仅用岩石孔隙度关联岩石孔隙鼓胀系数与岩石骨架压缩系数，一直存在争论。在对这两个问题的争论情况进行总结分析后发现，概念混乱、对工程和力学问题认识不清、数学推导错误是产生争论的主要原因，并指出Terzaghi公式是错误的、不可仅用岩石孔隙度关联岩石孔隙鼓胀系数与岩石骨架压缩系数。同时，提出了岩石鼓胀系数、岩石孔隙鼓胀系数、岩石渗透率鼓增系数、岩石压缩系数、岩石孔隙压缩系数和岩石渗透率压减系数等6个概念，并给出了其物理意义及表达式。讨论认为，用这6个概念可以解决多孔岩石鼓胀压缩特性表征方面出现的混乱现象。Abstract: It is always controversial when one discusses the best way to calculate the stress in porous media and whether the porosity of rock can only be used to correlate the rock pore swelling coefficient and skeleton compression coefficient.After summarizing and analyzing the arguments of these two problems,the authors found that the main causes of disputes were caused by confused concepts,unclear understanding of engineering and mechanics,and wrong mathematical derivation.The authors proposed that Terzaghi’s formula was wrong,and it was impossible to correlate rock pore swelling coefficient and rock skeleton compression coefficient only by rock porosity.Meanwhile,the paper put forward six coefficients,including the rock swelling coefficient,the rock pore swelling coefficient,the rock permeability swelling-increase coefficient,the rock compression coefficient,the rock pore compression coefficient,and the rock permeability compression-decrease coefficient,and also given their physical meanings and expressions,which can solve the confusion of the characterization of swelling and compression features in porous rocks.
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Keywords:
- porous rock /
- effective stress /
- rock volume /
- pore volume /
- permeability
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