饱和孔隙热弹性岩石井周应力状态分析

H. Tran, Truong Hung Trieu, N. Nguyen
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引用次数: 0

摘要

在油气开发或地热能源开发行业中,可以在地层高温饱和的深度钻井。在这种情况下,岩体与钻井液之间可能出现较大的温差,这是不可忽视的。在钻井过程中,岩石内部的热、水力和力学现象同时出现,并相互作用。基于岩体全热-水-力行为模型,采用有限元方法对饱和热岩井筒周围应力状态进行了分析。考虑了涉及井壁热条件的两种情况,即钻井液温度低于或高于地层温度,分别称为“冷却”和“加热”情况。在本研究中,还明确了岩体的一些热、水力和初始应力场参数对井筒周围应力状态的影响。结果表明,在冷却情况下,井壁可能因破裂破坏而失稳,而在加热情况下,井壁可能因坍塌破坏而失稳。在两种情况下,切向应力和轴向应力的最大值出现在相同的位置。此外,热膨胀系数、岩体初始剪应力对井筒周围应力状态影响较大,而地层渗透率对井壁应力没有影响,只对周围地层内部应力有影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of the stress state around wellbores in saturated porothermoelastic rock
In the oil and gas exploitation or geo-thermal energy exploitation industries, wellbores can be drilled at great depths where the formation would be hot and saturated. In such case, a large temperature difference between the rock mass and drilling fluid can occur and cannot be ignored. During drilling the wellbores, thermic, hydraulic and mechanical phenomena appear simultaneously and interact with each other within the rock. This study presents the analysis of stress state around the wellbore located in saturated hot rock based on the fully thermo-hydro-mechanical behavior model of the rock mass by the finite element method. Two scenarios involving thermal conditions at the well wall are taken into account, i.e. the drilling fluid temperature is lower or higher than the formation temperature so-called the cases of “cooling” and “heating”, respectively. In this study, the influence of some thermic, hydraulic and initial stress field parameters of the rock mass on the stress state around the wellbore was also clarified. The obtained results showed that, in the cooling case, the well wall may be destabilized by fracture failure while in the heating case this would be collapse failure. The maximum points of tangential and axial stresses appear at the same locations for the two scenarios. In addition, the thermal expansion coefficient, the initial shear stress in the rock mass greatly affect the stress state around the wellbore whilst the permeability of the formation does not influence on the stresses on the well wall but only on the stresses inside the surrounding formation.
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