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首页» 过刊浏览» 2018» Vol. 3» Issue (4) 390-398     DOI : 10.3969/j.issn.2096-1693.2018.04.035
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双重有效应力再认识及其综合作用
毛小龙,刘月田,冯月丽,郑文宽,刘思平
中国石油大学油气资源与探测国家重点实验室,北京 102249
Re-recognition of dual effective stresses and the comprehensive effect
MAO Xiaolong, LIU Yuetian, FENG Yueli, ZHENG Wenkuan, LIU Siping
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China

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摘要  Terzaghi有效应力原理只考虑了土体结构变形,为了适应更一般的情况,李传亮提出了多孔介质的双重有效应力:本体有效应力和结构有效应力。双重有效应力概念简洁易懂,被广泛引用,然而两个有效应力表达式及其导出的孔隙压缩系数和应力敏感理论却与测试结果相矛盾。本文在多孔介质的应力应变分析基础上,推导出了新的双重有效应力表达式,分析其综合作用并得到了总有效应力表达式,与 Laughton等实验以及 Hall图版对比,论证了其适用性,并给出了应用实例。研究表明:旧双重有效应力表达式与 Biot、Bishop早期提出的两个有效应力表达式相同,与 Laughton等高压实验结果相矛盾;新双重有效应力首次提出了颗粒形状变形及其对岩石总体积应变的影响,而未能考虑颗粒间变形和颗粒形状变形是旧孔隙压缩系数理论计算值远小于实验测试值的根本原因;新双重有效应力与 Skempton有效应力内涵相同,其综合作用得到的总有效应力方程与 Skempton有效应力方程一致;新双重有效应力很好地解释了 Laughton等经典实验测试结果,其导出的孔隙压缩系数与 Hall图版认识一致,从应变机理上论证了岩石孔隙压缩系数与孔隙度负相关、低渗透油藏应力敏感程度更强的实验认识。
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关键词 : 双重有效应力;压缩系数;颗粒体积变形;颗粒形状变形;颗粒间变形;应力敏感
Abstract

The Terzaghi effective stress principle only considers the deformation of soil structure. To adapt to more general situations, Li Chuang-liang proposed the dual effective stresses in porous media: the primary effective stress and the structural effective stress. The concept of dual effective stresses is easy to understand and has been widely cited. However, the two effective stress expressions and the pore compression coefficient and stress sensitivity theory derived from them contradict the test results. Based on the analysis and comparison of commonly used effective stress expressions, the stress-strain of porous media is closely analyzed. The new dual effective stress expressions are derived, their comprehensive effect is analyzed and the total effective stress expression is obtained. Compared with the Laughton et al. experiment and the Hall chart, the applicability of the new dual effective stresses is demonstrated and an application example is given. The results show that the previous two effective stress expressions are the same as the effective stress expressions earlier proposed by Biot and Bishop, which is contradictory to the Laughton et al. experiments. The new dual effective stress first proposed grain shape deformation and its significant influence on the total volumetric strain of the rock. The failure to take into account intergranular deformation and grain shape deformation is the fundamental reason that the theoretical value of the previous pore compression coefficient is far less than the experimental value. The dual effective stresses have the same connotation as the Skempton effective stress, which comprehensively considers grain deformation and intergranular deformation. The comprehensive effect total effective stress expression is the same as the Skempton effective stress. The expressions of the new dual effective stresses can explain well the results of Laughton et al. experiments. The pore compressibility coefficient is consistent with the Hall chart, which theoretically demonstrated that the rock pore compression coefficient is negatively correlated with the porosity and a low-permeability reservoir is more sensitive to stress.  

Key words: dual effective stresses; compressibility coefficient; grain volume deformation; grain shape deformation; intergranu-lar deformation; stress sensitive
收稿日期: 2018-06-12     
PACS:    
基金资助:国家自然科学基金项目“各向异性裂缝页岩气藏渗流机理与理论研究” (51374222);国家重大专项“中东典型碳酸盐岩油藏改善水驱开发效果关键技术研究” (2016ZX05032005-002);国家重点基础研究发展计划“陆相致密油高效开发基础研究” (2015CB250905);中国石油重大科技专项“火山岩油藏效益开发关键技术研究与应用”(2017E-0405)联合资助
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引用本文:   
毛小龙, 刘月田, 冯月丽, 郑文宽, 刘思平. 双重有效应力再认识及其综合作用. 石油科学通报, 2018, 04: 390-398
链接本文:  
MAO Xiaolong, LIU Yuetian, FENG Yueli, ZHENG Wenkuan, LIU Siping. Re-recognition of dual effective stresses and the comprehensive effect. Petroleum Science Bulletin, 2018, 04: 390-398.
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