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页岩气致密储层渗流模型及压裂直井产能分析

DOI: 10.6052/1000-0879-13-357, PP. 156-160

Keywords: 页岩气,直井压裂,稳定渗流模型,产能

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Abstract:

页岩气储层中存在大量的纳微米孔隙,其中气体的流动规律不同于常规气藏.文章考虑克努森扩散及解吸作用的影响,建立页岩气稳态条件下产能公式,利用渗流阻力法得到了页岩气储层压裂直井产能方程.结合生产实例,进行了数值模拟计算.结果表明当裂缝导流能力达到0.12μm2·cm后,产气量增幅减小,由此对裂缝导流能力进行优化.游离气产量占总产气量的85%~90%,游离气对总产气量贡献较大.该模型为页岩气产能预测及开发指标优化提供了理论依据.

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