压降曲线三维分析方法及应用

THE P-3D ANALYZING METHOD OF FRACTURING PRESSURE DECLINE CURVE AND ITS APPLICATION

本文建立了Palmer拟三维压降曲线分析模型;用应力强度因子准则研究了停泵后裂缝的延伸;讨论了拟合压力随时间变化的原因,提出对不同的地层条件应选择不同的压降曲线分析模型。文中提供的方法可确定地层滤失系数、裂缝几何参数、压裂层断裂韧性等。

Palmer′s P-3D fracturing pressure decline curve analyzing model is established in this paper. The paper also takes the fracture propagation after shut-in according to the criterion of stress intensity factor into cons-ideration and the reason of change of matched pressure with time during shut-in is discussed. In addition, this paper points out that it is important to use corresponding pressure decline analyzing model for different formation conditions. Effective fluid-loss coefficient, fracture geometry parameters and toughness of rocks will be determined by using the met-hod suggested in this paper.