页岩气水平井体积压裂试井压力特征

 页岩气藏普遍采用体积压裂方式开发。通过考虑吸附解吸影响的渗流方程,建立了考虑压裂体体积及展布的水平井渗流模型,分析了不同压裂体体积及展布情况下的压力特征。研究表明:压裂体体积及展布主要影响早期线性流曲线形态特征;压裂体的压裂程度影响着早期线性流持续时间的长短;早期线性流曲线特征受多重因素影响,在对体积压裂进行试井评价时需要综合考虑。

Pressure characteristics of shale gas fractured horizontal well

Most shale gas reservoirs are exploited with the multi-hydraulic fracture method. In this paper, a new shale gas fractured horizontal well flow model is established which considers the effects of stimulated area's nonuniform distribution and gas desorption. With the plots of pressure and derivative curves, the stimulated area's volume and distribution characteristics are analyzed. The results demonstrate that the pressure curves are sensitive to fracturing effect. The well bottom hole pressure is lower when more areas are stimulated. The plots show that the duration of early linear flow depends on the volume of stimulated areas and their distribution, and that the fracture degree of stimulated area also affects the duration of early linear flow.