非均质储层水平井分段压裂设计及应用

DESIGN AND APPLICATION OF HORIZONTAL WELL STAGED FRACTURING IN HETEROGENEOUS RESERVOIR

针对河道砂、透镜砂及砂泥岩互层等非均质性储层压裂布缝难度大,储量难动用的问题,以最小阻隔层厚度划分渗流单元,每个渗流单元轴向上优化裂缝条数充分动用不同砂体,横向上优化裂缝长度控制砂体,垂向上控制缝高或穿越多个层段,形成基于独立渗流单元的水平井立体压裂设计优化技术,实现了人工裂缝参数与砂体展布、储层渗流能力相匹配。现场应用效果显著,对国内致密砂岩气藏难动储量开发有较好的借鉴作用。

Because it's hard to plan the fracture distribution during fracturing and hard to recover the reserves in heterogeneous reservoirs like river channel sands, lens sands and sand/silt interbeds etc.,the reservoirs are divided into seepage units according to the minimum barrier thickness to optimize the quantity of fractures axially on each unit to fully develop different sand bodies and to optimize the fracture length laterally to control sand bodies,the fracture height is control or fractures aredeveloped through multiple layers vertically. A set of optimization technology for horizontal 3D fracturing design is set up based on independent flow units,realizing the matching between the artificial fracture parameters and the distribution of sand bodies and reservoir flow capacity. Field application results are obvious. It can be used as reference for development of difficultto-recover reserves in tight sandstone gas reservoirs in China.