三维压裂压力递减分析方法

在前人提出的拟三维压力递减分析模型基础上,建立了解释压裂后压力递减的三维模型,模型考虑了压裂液的续流影响.利用所建模型分析的压裂停泵后的压力递减数据,可计算裂缝几何参数(裂缝宽度、高度、长度)、压裂液滤失系数、地层应力强度因子、压裂液效率和裂缝延伸时间等,为调整大型压裂设计方案和新区整体压裂优化设计提供可靠的参数.研制了一套windows环境下的解释软件,运用该软件可获得有关评价参数.用计算实例说明了三维压裂压力递减分析方法的适用性和可靠性.

Analyzing Method of 3D Fracturing Pressure Decline Curve

With the development of fracturing technique, especially with the development of system fracturing in oil and gas reservoir, the technique of postfrac evaluation is increasingly valued. It is necessary to extensively improve and develop the corresponding test and interpretation. Based on P-3D model with pressure decline curve, a 3D model considered the pressure decline curve after fractured was established in this paper. the 3D model coupled with pressure decline curve can calculate effective fluid loss coefficient, closing time, fluid efficiency, formation stress intensity factor,fracture geometry parameters such as fracture length, fracture height, fracture width and other basic parameters. It can optimize the design of system fracturing in new oilfield and offer evidence for evaluating productivity in fractured well. A set of analysis software of 3D mathematical model for windows was developed, by which we can obtain the relevant parameters for post-fracturing evaluation. Some field examples showed that the 3D model analysis method was practical and more reliable.