低渗透油层二次压裂评价新方法及应用

方法　在大庆朝阳沟低渗透油层水力压裂矿场资料基础上 ,运用珀金—克恩公式、卡特公式以及本文提出的压裂强度的概念 ,得到了该油田一、二次压裂缝长、缝宽的回归方程。目的　应用该回归方程对朝阳沟油田一、二次压裂缝长、缝宽及裂缝导流能力进行评价。结果　在压裂强度较大时 ,二次压裂缝宽增加较大 ;而在压裂强度较小时 ,缝长增加较大 ;二次压裂裂缝导流能力增加较大。结论　该方法对二次压裂评价和工艺设计以及提高压裂效果具有重要意义。

A novel method for evaluating secondary fracturing of low permeability oil layer and its application.

Method Based upon hydaulic fracturing field data from low pemeability formation, chaoyang'gou area, Daqing oil field, applying Pakin Kern equation, Karter equation and fracturing strength concept raised in this paper, Recession equation for calculating fracture width, length during primary and seconday fracturing in this oil field is achieved. Purpose To evaluate fracture width, lengtyh and fluid conductivity capacity during primary and secondary fracturing in Chaoyang'gou oil field with this regression equation. Result Fracture width in secondary fracturing presents relatively great increas under great stength, nevertheless, fracture lengh shows relatively great increase under small strengh. Generally, secondary fracturing will lead to relatively great fluid conductivity capacity. Conclusion This method has important signifcance in respect of evaluating secondary fracturing, desingning techniques applied and improving fracturing results.