裂缝性储层水力裂缝扩展机理试验研究_周健.pdfVIP

2 8 5 Vol. 2 8 No. 5 2 007 9 A CT A PETROLEI SINICA Sept. 2 00 7 : 0253O2697 ( 2 00 7) 05O0 10 9O0 5 周 健 陈 勉 金 衍 张广清 ( 102249) : 采用大尺寸真三轴实验系统, 探讨了天然裂缝与水力裂缝干扰后水力裂缝走向的宏观和 观影响因素, 分析了压力曲线, 提 出了天然裂缝破坏准则, 分析了不同地应力状态下裂缝的形态试验结果表明, 在常规应力状态下, 水平主应力差和逼近角是水平 裂缝走向的宏观影响因素; 天然裂缝界面摩擦系数和缝内净压力无因次量是 观影响因素给出了确定天然裂缝破坏边界线的回 归公式, 揭示了裂缝性油气藏水力裂缝与天然裂缝的干扰机理局部构造应力状态对水力裂缝扩展的影响大于对天然裂缝的影 响 : 水力压裂; 水力裂缝; 天然裂缝; 裂缝干扰机理; 裂缝扩展机理; 试验研究 : T E3 571 1 1 : A Experimental study on propagation mechanism of hydraulic fracture in naturally fractured reservoir Zhou Jian Chen M ian Jin Yan Zhang Guangqing ( K ey L abor ato ry f or P etr ole um E ng ineer ing of the M in istr y of E d ucat ion, China Un iv ers ity of P etr oleum, B e ij ing 102 24 9, Ch ina) Abstract: The influen es of ma ro-parameters and m i ro- paramet ers on the strike of hydrauli fra ture intera t ed by natural fra ture were st udied by a series of large-size tr-i axial experiments. The urves of pump pressure w ere analyzed, and the boundary line of natu- ral fra ture failure was det ermined. The fra ture geometries under the different in-sit u stresses were dis ussed. The test results indi- ated that the differential stress and angle of interse tion were the ma ro-parameters affe ting the hy drauli fra ture propagation in normal st ress regime, and t he interfa ial fri tion oeff i ient and dimensionless net pressure w ere the mi ro-parameters for fra t ure propagation. T he fra ture propagat ion me hanism of hy drauli fra turing in naturally f ra tured reservoir w as dis usse