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高埋深储层泥岩弹塑性力学特征试验研究

Experimental Study on Elastoplastic Mechanical Properties of Mudstone in High Buried Depth Reservoir
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摘要 泥岩作为油气储层常见复杂介质,高埋深环境下的力学特性与浅部岩石呈现明显不同。本文以油气藏工程高埋深储层泥岩为研究对象,在物理特性分析的基础上,探讨了其弹塑性力学特性。首先开展了不同围压作用下的三轴常规压缩实验;泥岩均具有较大塑性压缩和延性扩容变形,强度硬化特征显著,破坏呈现延性屈服平台;且峰值强度随围压增加而增大。其次探讨了屈服破坏、塑性硬化和体积扩容等特性;泥岩破坏符合非线性屈服准则,硬化特性可用幂函数予以描述,且体积呈现典型的压缩向扩容转化。基于上述分析,最后采用非关联流动法则,在热动力学框架下构建了弹塑性本构模型,进而模拟研究了深层泥岩的弹塑性力学特性,模拟与试验结果具有良好的一致性,印证了弹塑性力学分析的准确性。相关成果可为深部泥岩储层油气藏工程理论研究和稳定分析提供可靠的依据。 As a common complex media in oil and gas reservoirs,the mechanical properties of mudstone in high depth environment are obviously different from those of shallow rocks.Based on the analysis of physical characteristics,the elastoplastic mechanical properties of mudstone with high buried depth in oil and gas reservoir engineering were studied.Firstly,triaxial conventional tests were conducted to characterize the mechanical behavior of mudstone under different confining pressures.The mudstone exhibited significant plastic compression and ductility dilation strain.Meanwhile,it also showed obvious strength hardening behavior and the failure exhibited ductile yielding platform.The peak strength increased with an increase in confining pressure.Secondly,the characteristics of yield failure,plastic hardening and volume dilation were discussed to study the elastoplastic mechanical properties of mudstone.The failure surface of mudstone performed a nonlinear yield behavior and the hardening characteristics could be described by power function.And the volume presented typical compression dilatancy transformation.Finally,an elastoplastic constitutive model was proposed with the use of non-associated flow rule under the framework of thermodynamics.The simulation was in good agreement with the experimental results,which confirmed the accuracy of the elastoplastic mechanical analysis.These results can provide reliable basis for engineering research and stability analysis of deep mudstone reservoir.
作者 张玉 胡良强 俞缙 王璐 于婷婷 Zhang Yu;Hu Liangqiang;Yu Jin;Wang Lu;Yu Tingting(College of Pipeline and Civil Engineering,China University of Petroleum( East China) ,Qingdao,Shandong 266580;Fujian Research Center for Tunneling and Urban Underground Space Engineering,Huaqiao University,Xiamen,Fujian 361021,P.R.China)
出处 《地下空间与工程学报》 CSCD 北大核心 2018年第S2期521-528,共8页 Chinese Journal of Underground Space and Engineering
基金 国家自然科学基金(51409261,51679093) 青岛市应用基础研究计划项目(17-1-1-33-jch) 中央高校基本科研业务费专项资金(16CX05002A) 水能资源利用关键技术湖南省重点实验室开放研究基金(PKLHD201601).
关键词 岩石力学 高埋深储层 泥岩 弹塑性特征 非关联流动法则 rock mechanics high buried depth reservoir mudstone elastoplastic characteristics non-associated flow rule
作者简介 张玉( 1985-) ,男,山东青岛人,博士,副教授,主要从事岩石力学与工程等领域的教学与科研工作。E-mail: zhangyu@ upc.edu.cn
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