张磊1,徐兵祥2,辛翠平1,乔向阳1,穆景福1,许阳3,韩长春1
Zhang Lei1,Xu Bing-xiang2,Xin Cui-ping1,Qiao Xiang-yang1,Mu Jing-fu1,Xu Yang3,Han Chang-chun1
摘要: 多级压裂水平井裂缝形态复杂性增加了页岩气产能预测的难度,基于裂缝形态为“主裂缝+复杂裂缝网络”的情况,建立考虑主裂缝的页岩气三孔线性流数学模型,通过无因次化和Laplace变换求得拉式空间下产量解析解,编程计算得到三孔模型产量典型曲线,其中裂缝线性流为主裂缝与复杂裂缝网络系统的共同作用。对比三孔模型与双孔模型,三孔模型增加了主裂缝系统,主裂缝不仅决定着页岩储层中气体的流动模式,同时影响着页岩气井的产量。分析主裂缝对产量的影响,结果表明:裂缝半长xF影响流动的每个阶段,xF越大产量越高,流动到达边界时间越早;缝宽wF影响裂缝线性流和过渡流阶段,wF越大产量越高,但裂缝线性流阶段持续时间不变,过渡流持续时间缩短;xF对产量的影响程度大于xF。三孔模型的建立,不仅能指导页岩气井压裂施工,而且为存在主裂缝的页岩气多级压裂水平井提供了产能预测和分析模型,提高了页岩气井产量预测的精度。
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