孙龙,王志荣,李洪刚

• 1:核工业金华工程勘察院
• 2:郑州大学水利科学与工程学院

摘要(Abstract)：

为了深入探讨应力场、裂隙场、渗透场三场耦合条件下的压裂缝延伸规律。首先基于有效应力原理,考虑煤储层应力敏感性,建立了动态渗透率计算模型;其次,考虑相应的滤失系数动态变化对裂缝扩展的影响,基于PKN模型建立了改进的压裂缝延伸模型,并进行实际单井的应用及分析;最后,运用ABAQUS软件模拟滤失系数动态条件下应力演化规律与压裂缝延伸过程,并将理论值与数值模拟值进行对比分析。结果表明,压裂缝延伸过程中储层渗透率变化最大,增大了约22.25倍;滤失系数次之,增大了约7.03倍;孔隙度变化最小,增大了约2.02倍,而裂缝延伸距离随压裂时间的增长而增长,但前期增长较快,后期基本趋于稳定,当压裂时间为60min,压裂缝延伸距离为141.23m,与数值模拟结果(132.8m)较为吻合,从而验证了模型的正确性,研究成果可为实际施工控制提供理论依据。

关键词(KeyWords)： 水力压裂;有效应力原理;动态滤失系数;裂缝延伸;数值模拟

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41272339);; 河南省自然科学基金项目(182300410149)

作者(Author): 孙龙,王志荣,李洪刚

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