申请人:Phillips Petroleum Company
公开号:US04561501A1
公开(公告)日:1985-12-31
In accordance with the present invention, oil is recovered from a subsurface earth formation by injecting into the subsurface formation an aqueous surfactant system containing a polyvalent metal carboxylate, as a surfactant, a cosurfactant and an electrolyte in concentrations and proportions to form multiphase system with the reservoir oil, thereafter, injecting into the earth formation a drive fluid to drive the multiphase system through the reservoir and displace a significant amount of the reservoir oil and withdrawing the thus displaced oil from the subsurface earth formation. A novel aqueous surfactant system, adapted to thus recover oil from a subsurface formation, comprises a polyvalent metal carboxylate, such as calcium isosteareate, as a surfactant, and an alcohol having at least five carbon atoms, as a cosurfactant, and an electrolyte, such as sodium chloride, in proportions which form a multiphase system with the reservoir oil.
根据本发明,通过向地下地层注入含有多价金属羧酸盐的水性表面活性剂体系、辅助表面活性剂和电解质,以浓度和比例形成多相系统与储层油相结合,从而从地下地层中回收油。然后,向地层注入驱动流体,以驱动多相系统通过储层并置换大量的储层油,并从地下地层中提取被置换的油。一种新型的水性表面活性剂体系,适用于从地下地层中回收油,包括多价金属羧酸盐,例如异硬脂酸钙,作为表面活性剂,以及至少具有五个碳原子的醇作为辅助表面活性剂和电解质,如氯化钠,以形成与储层油相结合的多相系统。