大庆石油地质与开发2024，Vol.43Issue(6)：61-70,10.DOI:10.19597/J.ISSN.1000-3754.202306063
考虑超临界CO2损伤的椭球形三维裂缝计算新模型
A new 3D model for calculating ellipsoidal fractures considering damage from supercritical CO2
摘要
Abstract
Most current research on supercritical CO2 fracturing focuses on laboratory test of rock damage mecha-nism and deterioration mechanical parameters,while less on fracturing-formed 3D fractures geometry.In order to characterize fractures geometry extension during supercritical CO2 fracturing process,a new 3D calculation model for ellipsoidal fractures propagation in plane strain condition is established based on Griffith fracture mechanics the-ory.Combined with previous laboratory test results,a correlation equation between rock elastic mechanical parame-ters and supercritical CO2 multi-soaking factors is regressed.The influence of parameters of supercritical CO2 pres-sure,temperature,pumping displacement,initial elastic modulus,initial Poisson's ratio,net pressure in frac-tures,and reservoir thickness on fractures propagation geometry is discussed.The results show that,fracture height-controlled measures should be taken during supercritical CO2 fracturing for target layers with upper and lower aqui-fers,supercritical CO2 fracturing can be given prior consideration for hard and low-permeability reservoirs,super-critical CO2 fracturing technique is more suitable for reservoirs with high minimum horizontal principal stress,and supercritical CO2 fracturing helps to achieve the same average fracture width at low pumping displacement.The re-search results have much significance for fractures parameters optimization of supercritical CO2 fracturing in uncon-ventional oil and gas horizontal wells.关键词
超临界CO2/岩石力学/损伤/三维裂缝/模型/平面应变Key words
supercritical CO2/rock mechanics/damage/3D fracture/model/plane strain分类
能源科技引用本文复制引用
纪国法,林中天,聂一林,赵文伟..考虑超临界CO2损伤的椭球形三维裂缝计算新模型[J].大庆石油地质与开发,2024,43(6):61-70,10.基金项目
国家自然科学基金项目"基于分形理论及多尺度方法的页岩体积改造压裂液滤失机理研究"(51804042) （51804042）
长江大学非常规油气省部共建协同创新中心开放基金"考虑页岩弱结构面的人工裂缝穿层延展机理研究"(UOG2022-38). （UOG2022-38）
