施工参数对水平井多裂缝同步扩展影响研究  

Study on the Influence of Construction Parameters on the Simultaneous Propagation of Multiple Fractures in Horizontal Wells

作　　者：蒋雪峰[1] 郭巧珍[1] 马忠勇 王倩[1] 王青[1] 于庆森 杨永智[3] JIANG Xuefeng;GUO Qiaozhen;MA Zhongyong;WANG Qian;WANG Qing;YU Qingsen;YANG Yongzi(PetroChina Xinjiang Oilfield Company Exploration and Development Research Institute,Karamay,Xinjiang 834000,China;Mud Technology Service Co.of CNPC Bohai Drilling Engineering Co.,Ltd.;Research Institute of Petrolem Exploration&Development of China)

机构地区：[1]中国石油新疆油田公司勘探开发研究院 [2]中石油渤海钻控工程有限公司泥浆技术服务分公司 [3]中国石油勘探开发研究院

出　　处：《钻采工艺》2020年第5期49-52,I0004,共5页Drilling & Production Technology

基　　金：中国石油新疆油田分公司重大科技专项“准噶尔盆地油藏富集规律及勘探技术研究与应用”(编号:2017E-0401);国家十三五重大专项“CO2捕集、驱油与理存发展规划研究”(编号:2016ZX05016005-001)联合资助。

摘　　要：压裂实践表明由于施工参数影响水平井分段压裂过程中部分射孔簇未能形成有效裂缝。文章基于黏聚力模型(CZM)和伯努利方程,考虑压裂液流经井筒、射孔孔眼的摩阻和裂缝延伸过程中的应力干扰,建立了耦合井筒与地层的有限元数值模拟模型,分析了施工参数对裂缝同步竞争扩展的影响。结果表明,段内多簇射孔时从各射孔簇起裂的裂缝存在着竞争扩展,缝间应力干扰和压裂液受到的摩阻作用使压裂液在各射孔簇之间的分配并不均匀。增大施工排量和压裂液黏度,降低单簇射孔孔眼数量,减小射孔孔眼直径,均能不同程度地促进各射孔簇裂缝均匀扩展。研究结果为提高水平井分段压裂效率提供了理论依据。Fracturing practice shows that due to the influence of construction parameters,some perforation clusters failed to form effective fractures during the staged fracturing of horizontal wells. Based on the cohesive force model( CZM) and Bernoulli equation,this paper considers the friction of the fracturing fluid flowing through the wellbore and perforation and the stress interference in the fracture propagation process,and establishes a finite element numerical simulation model that couples the wellbore and the formation Analyzed the influence of construction parameters on the simultaneous competition and propagation of cracks. The results show that when multiple clusters are perforated in the segment,the fractures that start from each perforation cluster are competitively expanded. The stress interference between fractures and the friction of the fracturing fluid make the fracturing fluid to be distributed among the perforation clusters.Not uniform. Increasing the construction displacement and fracturing fluid viscosity,and reducing the number of perforations in a single cluster,can all promote the uniform expansion of fractures in each perforation cluster to varying degrees. The research results provide a theoretical basis for improving the efficiency of staged fracturing in horizontal wells.

关 键 词：水平井 射孔 裂缝 延伸规律 限流法压裂 

分 类 号：TE357[石油与天然气工程—油气田开发工程]