特种油气藏2023，Vol.30Issue(6)：141-149,9.DOI:10.3969/j.issn.1006-6535.2023.06.019
纹层型页岩油储层裂缝扩展机理及工艺对策
Mechanism of Fracture Extension and Process Countermeasures in Grain-Type Shale Oil Reservoirs
摘要
Abstract
In response to the problem of high longitudinal non-homogeneity and unclear mechanism of hydraulic fracture initiation and propagation in grain-type shale oil reservoirs,the combination of discrete element fracture simulation and hydraulic fracturing physical modeling experiments was used to study the influence of factors such as vertical geostress difference,viscosity of fracturing fluid,pumping process,and perforation cluster spacing on the fracture propagation pattern of grain-type terrestrial shale oil reservoirs.The results show that:The de-viscosity and slip of weak structural surfaces between layers is an important reason for the stagnation of longitudinal propagation of fracture height in grain-type shale oil reservoirs,and the smaller the vertical principal stress difference is,the easi-er the laminar surfaces are activated,and the growth of fracture height is suppressed;the use of alternating pumping of high-viscosity and low-viscosity fracturing fluids is conducive to the realization of balanced longitudinal and transversal propagation of hydraulic fractures,and the realization of 3D development of reservoirs;the reduction of the perforation cluster spacing and the increase in the number of perforation clusters can significantly increase the area of hydraulic fractures and the reservoir drainage area.The study results are of great significance for realizing the deep penetration stimulation of grain-type shale oil reservoirs in the longitudinal direction and increasing the pro-duction of a single well.关键词
纹层型页岩油储层/水力裂缝/裂缝扩展/密切割/泵压曲线/离散格子算法Key words
grain-type shale oil reservoir/hydraulic fracture/fracture propagation/intensive cutting/pumping pressure curve/discrete lattice algorithm分类
能源科技引用本文复制引用
周忠亚..纹层型页岩油储层裂缝扩展机理及工艺对策[J].特种油气藏,2023,30(6):141-149,9.基金项目
中国石化股份公司十条龙项目"复兴侏罗系陆相页岩油气水平井增产改造技术"(P21078-7) （P21078-7）
