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裂缝在非均匀岩层内扩展机理研究

DOI: 10.6052/1000-0879-12-194

Keywords: 砂/泥岩界面,裂缝,扩展有限元,白光散斑实验,扩展规律

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Abstract:

薄差储层有效开发的关键问题是明确水力裂缝在砂/泥岩界面上的扩展特性.为了分析裂缝在砂/泥岩界面上的扩展机理,以ABAQUS为平台,利用扩展有限元框架下的分离裂缝模型模拟了裂缝在砂/泥岩界面上的扩展过程,该模型提出预设虚节点法,通过在位移的插值函数中引入附加增强项,实现裂缝扩展独立于网格边界,获得了裂缝通过砂/泥岩界面的扩展规律.并采用白光散斑实验对低渗透储层砂/泥岩界面的裂缝扩展进行了实时跟踪,裂缝扩展过程与数值模拟过程吻合较好,说明扩展有限元法是定量分析裂缝扩展的有效手段,同时分析了裂缝穿过界面扩展的影响因素.

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