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| 1 | 横观各向同性岩石力学-化学-损伤耦合有限元分析显示文摘该文基于层理性岩石的水化作用和连续损伤特性,建立力学-化学-损伤耦合的有限元(FEM)求解方法,开展含钻井孔岩石的井壁应力和围岩损伤演化分析。该文发展横观各向同性Biot本构关系,采用Weibull分布函数表征岩石的非均质性;考虑水化作用引起的损伤,结合当前应力状态的应力损伤得到损伤张量,对弹性模量和渗透率进行损伤分析,实现层理性岩石在水化和荷载作用下的连续损伤演化,形成一套渗流-应力-化学-损伤(HMCD)耦合分析方法。该文给出数值算例,将含损伤横观各向同性模型用于研究层理性岩石的水化特性,表明岩石的非均匀性和水化作用对井壁应力解答具有重要影响,该有限元求解方法可对岩石水化、损伤进行可靠、有效的数值分析。 | 王永亮 庄茁 柳占立 杨恒林 | 2017 | 工程力学2017，34，9： | 10 |
| 2 | Finite element analysis for inclined wellbore stability of transversely iso-tropic rock with HMCD coupling based on weak plane strength criterion显示文摘The finite element analysis(FEA) technology by hydraulic-mechanical-chemical-damage(HMCD) coupling is proposed in this paper for inclined wellbore stability analysis of water-sensitive and laminated rock, developed basing on the recently established FEA technology for transversely isotropic rock with hydraulic-mechanical-damage(HMD) coupling. The chemical activity of the drilling fluid is considered as phenomenological hydration behavior, the moisture content and parameters of rock considering hydration could be determined with time. The finite element(FE) solutions of numerical wellbore model considering the chemical activity of drilling fluid, damage tensor calculation and weak plane strength criterion for transversely isotropic rock are developed for researching the wellbore failure characteristics and computing the time-dependent collapse and fracture pressure of laminated rock as shale reservoirs. A three-dimensional FE model and elastic solid deformation and seepage flow coupled equations are developed, and the damage tensor calculation technology for transversely isotropic rock are realized by introducing effect of the hydration and the stress state under the current load. The proposed method utilizing weak plane strength criterion fully reflects the strength parameters in rock matrix and weak plane. To the end, an effective and reliable numerically three-step FEA strategy is well established for wellbore stability analysis. Numerical examples are given to show that the proposed method can establish efficient and applicable FE model and be suitable for analyzing the timedependsolutions of pore pressure and stresses, and the evolution region considering the hydration surrounding wellbore,furthermore to compute the collapse cycling time and the safe mud weight for collapse and fracture pressure of transversely isotropic rock. | WANG YongLiang ZHUANG Zhuo LIU ZhanLi YANG HengLin LI ChenFeng | 2017 | Science China(Technological Sciences)2017，60，4： | 1 |
| 3 | 基于物理界面的双重介质有限裂隙渗流模型显示文摘基于连续介质或者离散裂隙假设,含裂隙的多孔介质渗流问题有多种数学力学模型。受物理界面的启发,提出一种新的有限裂隙连续介质力学模型,可以为宏观裂隙-多孔介质内的流体输运问题等提供近似计算方案。该模型属于一类双重介质模型,将曲面上低维度的流场转化为三维空间的流场,并且与连续的多孔介质的流场耦合,在数学上表示为统一的输运控制方程和初始边界条件。这个近似模型为不方便实施高维度-低维度耦合求解的数值计算方法提供新的模拟思路,如光滑粒子流体动力学等无网格粒子类方法。 | 吴璇 沈文豪 王志华 黄隆州 | 2023 | 计算力学学报2023，40，5： | 0 |
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