岩性油气藏 ›› 2020, Vol. 32 ›› Issue (4): 172180.doi: 10.12108/yxyqc.20200418
• 石油工程 • 上一篇
崔永正1, 姜瑞忠1, 郜益华2, 乔欣3, 王琼1
CUI Yongzheng1, JIANG Ruizhong1, GAO Yihua2, QIAO Xin3, WANG Qiong1
摘要: 目前利用压裂井进行CO2驱已成为低渗透油藏开发的主要技术之一,水力裂缝导流能力是决定开发效果的关键因素,而试井研究多采用与实际不符的恒定缝宽假设对水力裂缝进行描述。基于三区复合理论,建立考虑空间变导流能力压裂直井的CO2驱试井模型,通过Laplace变换进行求解,进行数值反演,绘制典型试井曲线。典型曲线可分为井筒储集段、井筒储集后过渡段、双线性流段、地层线性流段、第一径向流段、第一过渡流段、第二径向流段、第二过渡流段、第三径向流段共9个阶段。对模型影响因素进行分析,裂缝导流能力越大,双线性流段阶段压差越小,CO2越容易注入;考虑裂缝导流能力变化后,早期压差增大,压力及压力导数曲线都呈现一定的上升,表现出类似表皮系数增大的现象;CO2及过渡区半径主要对径向流的持续时间及过渡流出现时间产生影响,半径越大,对应过渡流出现的时间越晚;一区与二区流度比越大,过渡区及最外区流动阶段所消耗的压差越大;二区与三区流度比,最外区流动阶段所消耗的压差越大。
中图分类号:
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