大庆石油地质与开发2026，Vol.45Issue(3)：66-74,9.DOI:10.19597/J.ISSN.1000-3754.202502009
特低渗油藏驱油剂蓄能压裂对裂缝扩展的影响
Effect of energy storage fracturing with displacement agents on fracture propagation in ultra-low permeability reservoirs
摘要
Abstract
To improve the recovery of ultra-low permeability reservoirs in peripheral oilfields of Daqing,true triaxial fracturing experiment using sandstone outcrops with different displacement agents and diversion times is per-formed,induced stress field evolution law is calculated combining with pore pressure induced stress model,and field fracturing stimulation is operated based on technical concept of"pre-fracturing energy storage,multi-stages di-version and soaking imbibition".The results show that pre-fracturing energy storage can change horizontal stress field,causing hydraulic fractures to deflect about 13°.As displacement agent volume increases from 150 mL to 450 mL,horizontal stress difference decreases by 1.81 MPa,fracture deflection increases by about 32°.Field displace-ment agent volume is nonlinear correlated with fractures azimuth.When displacement agent volume exceeds 2 000 m3,fractures network azimuth increase tends to slow down,with stimulation effect weakened.Temporary plugging diversion fracturing can form complex fractures network,and the difference between breakdown pressure of new fractures and the extension pressure of previous stages surpasses horizontal stress difference(5 MPa),causing new fractures to break in rock matrix.If the pressure difference is less than 5 MPa,new fractures occur along natural weak planes or micro-fractures,with small angle to the main fracture(less than 30°).The research provides refer-ence for field development of ultra-low permeability reservoirs.关键词
特低渗油藏/裂缝扩展/蓄能压裂/暂堵转向/孔压场Key words
ultra-low permeability reservoir/fracture propagation/energy storage fracturing/temporary plugging diversion/pore pressure field分类
能源科技引用本文复制引用
王英斌..特低渗油藏驱油剂蓄能压裂对裂缝扩展的影响[J].大庆石油地质与开发,2026,45(3):66-74,9.基金项目
中国石油天然气股份有限公司重大科技专项"大庆外围扶余油层转变注水开发方式试验"(2023ZZ17ZK05). （2023ZZ17ZK05）
