岩性油气藏 ›› 2016, Vol. 28 ›› Issue (4): 106112.doi: 10.3969/j.issn.1673-8926.2016.04.015
李友全1,孟凡坤2,阎燕1,韩凤蕊1,于伟杰1,周诗雨3
Li Youquan1,Meng Fankun2,Yan Yan1,Han Fengrui1,Yu Weijie1,Zhou Shiyu3
摘要:
CO2 驱是提高低渗透油藏采收率的一种重要方式,但目前对驱替过程中压力响应动态的认识不足。CO2 的注入使地层流体性质发生改变,形成CO2 区、CO2 -原油过渡区和未波及原油区。基于复合油藏渗流理论,引入幂律型公式和牛顿插值公式来描述CO2 -原油过渡区内流体非均质性的变化特征,建立了低渗透油藏CO2 驱试井模型,并采用数值方法进行求解。对CO2 -原油过渡区内2 种流体非均质性变化形式下的试井曲线特征进行了分析。结果表明:当CO2 -原油过渡区内流体黏度与综合压缩系数均呈幂律型变化时,其变化指数均增大,CO2 区与CO2 -原油过渡区流度比和导压系数比均增加,压力导数曲线斜率增大;当CO2 -原油过渡区综合压缩系数呈非连续性变化时,压力导数曲线因CO2 区与CO2 -原油过渡区导压系数比的增加而呈现下凹趋势。最后,通过实例应用提出了CO2 驱试井解释方法。
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