陆相页岩储层簇内射孔数量对裂缝扩展规律的影响  

Effect of the Perforations Number in Clusters on Fracture Propagation in Continental Shale Reservoirs

作　　者：于伟强 董康兴[1] 陆露 郭壮 魏玉阳 YU Wei-qiang;DONG Kang-xing;LU Lu;GUO Zhuang;WEI Yu-yang(School of Mechanical Science and Engineering,Northeast Petroleum University)

机构地区：[1]东北石油大学机械科学与工程学院

出　　处：《化工机械》2024年第6期915-923,共9页Chemical Engineering & Machinery

基　　金：国家自然科学基金面上项目(批准号:52274036)资助的课题。

摘　　要：由于陆相页岩储层的纹层页理发育,现场压裂施工发现其裂缝存在扩不高、延不远的现象,制约了该类储层的有效改造。遵循“控近扩远”的设计理念,在考虑储层横观各向同性力学性质、各射孔眼之间的流量分配、流固耦合共同作用,建立了陆相页岩水平井单簇裂缝扩展的数值模型。研究发现:裂缝近井筒复杂程度和裂缝高度均随着排量的增大而增大,随着单簇孔数的增加而降低;得到了对应不同排量下簇内孔数最优值,排量0.3 m^(3)/min时的最优孔数为8孔,排量0.5 m^(3)/min时的最优孔数为6孔,排量0.7 m^(3)/min时的最优孔数为8孔。The lamination and foliation development of continental shale reservoirs has characteristics of slightly-extended fractures in field fracturing construction and it restricts effective reconstruction of such reservoirs.Abiding by the design concept of"controlling the proximity and expanding the distance",the effect of the number of perforations on near-wellbore fracture propagation was studied from the perspective of intra-cluster porosity.In addition,through considering the transverse isotropic mechanical properties of the reservoir,the flow distribution between perforations and the interaction of fluid-structure coupling,a numerical model of single cluster and multiple fracture propagation in continental shale horizontal wells was established and the effects of perforation quantity and displacement on fracture propagation were investigated.The results show that,both the fracture near-wellbore complexity and fracture height increase with the increase of displacement,but decrease with the increase of the number of single cluster holes.In addition,the optimal number of holes in the cluster under different displacement was obtained.The optimal number of holes in the cluster with 0.3 m^(3)/min displacement is 8 holes and that in the cluster with 0.5m^(3)min displacement is 6 holes,as well as that in the cluster with 0.7m^(3)/min displacement is 8 holes.

关 键 词：陆相页岩 横观各向同性 簇内射孔 裂缝扩展 

分 类 号：TE34[石油与天然气工程—油气田开发工程]