双重均质复合油藏压裂井模型研究

为高效开发油藏提供依据,针对双重均质复合油藏进行水力压裂后形成的有限导流垂直裂缝,应用拉普拉斯变换,求得了双重均质复合油藏考虑裂缝储集和裂缝表皮效应的线性流模型井底压力表达式。应用Stefest数值反演,绘制了无因次压力及压力导数对时间的双对数特征曲线,对其动态特征及影响因素进行了分析。研究结果表明,其压力动态最显著的影响因素是裂缝储集系数、裂缝表皮系数和无因次导流能力,其它参数对井底压力动态的影响与其对普通直井油藏的影响相类似。

Study on Model of Dual-Porosity Homogeneous Composite Reservoir Fractured Well

According to the finite conductivity vertical fractures conducted by hydraulic fracture in dual-porosity homogeneous composite reservoir,the formulas of downhole pressure in Laplace space of dual-porosity homogeneous composite reservoir with fimite conductivity vertical fracture are obtained through using Laplace transform in order to provide a basis for the efficient development of reservoirs.At last,the log-log curves of pressure and its derivative to time are drawn out and the dynamic characteristics of the bottom hole pressure of finite conductivity vertical fracture well and its influence factors have been discussed.It is shown that the fracture storage factor,skin factor and dimensionless conductivity are the striking effect elements to pressure behavior.However,the influences of other elements on fractured well are similar to ordinary vertical wells.