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页岩储层黏土矿物水化膨胀致裂数值模拟研究

Unconventional Oil & Gas(2022)

Cited 0|Views8
Abstract
为了深入研究内应力场的变化对诱导微裂缝的影响,针对黏土矿物水化膨胀这一问题,运用复合材料理论的等应力和等应变理论估算黏土矿物和非黏土矿物的力学参数,采用数值模拟的方法分析黏土矿物吸水膨胀后诱导微裂缝的起裂和扩展规律.结果表明:1)内应力最大处产生在黏土矿物与非黏土矿物的界面处,最大Mises应力可达40.86 MPa,并随着与黏土矿物中心距离的增加而减小;2)2个黏土矿物膨胀诱导对称分布的内应力场,黏土矿物膨胀挤压导致其与非黏土矿物界面处的应力放大,当黏土矿物之间的距离由2d增加到4d时,最大Mises应力由47.45 MPa减小到40.81 MPa;3)黏土矿物水化膨胀对压后裂缝网络的形态具有显著的影响,黏土矿物间距离越近,黏土矿物和非黏土矿物界面处的应力越大,越容易形成复杂缝网.当黏土矿物间距大于4d后,这种放大效应消失;4)页岩孔隙中的水向前推进形成含水量梯度,导致微裂缝沿自吸端面不断向前扩展.为页岩储层水力压裂的优化及压裂液的返排措施的制定提供了理论基础,促进我国页岩气压裂水平的进步.
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