李娜,程远方,吴百烈,杨柳,董丙响,易新斌
LI Na,CHENG Yuanfang,WU Bailie,YANG Liu,DONG Bingxiang,YI Xinbin

• 1:中国石油大学(华东)石油工程学院
• 2:中国石油勘探开发研究院

摘要(Abstract)：

煤岩裂缝对压裂液滤失的影响十分重要,煤层内部存在大量不规则的天然裂缝,常规的裂缝描述方法已不适用。根据煤岩裂缝分布形态与裂缝密度的显著分形特征,采用分形维数的方法研究裂缝的分布和密度。通过实验分析了应力敏感性对渗透率的影响,计算了应力敏感性条件下的压裂液滤失系数,探讨了裂缝分形维数与压裂液综合滤失系数的关系。研究结果表明:有效应力减小,渗透率和压裂液综合滤失系数均增加;分形维数增大,裂缝分布越密集,复杂程度越高,压裂液综合滤失系数呈显著的指数递增趋势。
Coal rock fractures possess very important influences on the leakoff of the fracturing fluid,there are a great number of irregular natural cracks in the coal reservoir,the conventional fracture characterizing methods cannot adopt themselves to the above.According to the distribution configurations of the coal rocks and the obvious fractal characteristics with the fracture density,the crack distribution and density are researched with the help of the method of fractal dimensions.Through the analyses of the influences of the stress sensitivity on the permeabilities,the leakoff coefficients of the fracturing fluid are calculated under the conditions of the stress sensitivity,the relations between the fracture fractal dimensions and the overall leakoff coefficients of the fracturing fluid are discussed.The study results show that when reducing the effective stress,both of the permeabilities and the comprehensive coefficient are increased;the more rise of the fractal dimensions,the denser the fracture distribution will be,the higher the complex degree and moreover the overall coefficients will show obvious exponential incremental trend.

关键词(KeyWords)： 裂缝;压裂液滤失;分形;应力敏感性;有效应力
fracture;fracturing fluid loss;fractal;stress sensitivity;effective stress

Abstract:

Keywords:

基金项目(Foundation): 十二五国家科技重大专项“大型油气田及煤层气开发”(2011ZX05037-004)

作者(Author): 李娜,程远方,吴百烈,杨柳,董丙响,易新斌
LI Na,CHENG Yuanfang,WU Bailie,YANG Liu,DONG Bingxiang,YI Xinbin

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