纤维暂堵对重复压裂应力场的影响研究

Study on the effect of fiber temporary plugging on stress field of repeated fracturing

本文在建立了初次人工裂缝产生的诱导应力数学模型基础之上,基于渗流力学,采用势的叠加原理,对比了加入纤维暂堵液产生的诱导应力场对原地应力场的影响,实现了对垂直裂缝井重复压裂前由于注入纤维暂堵液产生的诱导应力场的定量分析。结果表明,注入纤维液后的应力椭圆面积比注入前变小。

Based on the mathematical model of induced stress produced by the first artificial crack,based on the seepage mechanics and the superposition principle of potential,the influence of induced stress field added to temporary plugging fluid on the in-situ stress field is compared.Finally,the quantitative analysis of the induced stress field caused by the injection of fiber temporary plugging fluid before repeated fracturing in a vertical fractured well is realized.The results show that the stress ellipse area after injection of fiber is smaller than that before injection.