体积压裂裂缝分布扩展规律及压裂效果分析—以鄂尔多斯盆地苏53区块为例

体积压裂技术为致密砂岩气藏大规模经济有效开发提供了新的途径。为了分析裂缝在体积改造中的分布和扩展规律,基于鄂尔多斯盆地苏53区块储层特征和渗流-应力耦合理论,采用RFPA-flow软件建立了储集层砂岩体的流固耦合模型,模拟分析了引导裂纹、天然裂缝、围压对体积压裂中裂缝扩展的影响。然后通过对比区块内体积压裂井、普通压裂井和未压裂井的实施效果,体现出体积压裂在致密砂岩气藏开发中的明显优势。

Fracture Distribution and Propagation laws and Effect Analysis of Volume Fracturing in the Su 53 block, Ordos Basin

The volume fracturing provides a new light for large-scale economic and effective development of tight sandstone gas reservoir. In order to analyze the fracture distribution and propagation laws during the volume fracturing, fluid-solid coupling models of the sandstone body were established with the RFPA-flow code based on the regional reservoir characteristics in Block Su53, Ordos basin and seepage-stress coupling theory. Then, the effects of guide fracture, natural fracture, and confining pressure on the fracture propagation were simulated with the proposed models during the volume fracturing. Comparing volume fractured wells with common fractured wells and without fractured wells, technology advantages of volume fracturing show up.