稠油蒸汽驱封窜剂/洗油剂复合调驱技术

Compound Profile-control and Oil Displacement Technology of Channeling Plugging Agent and Oil-washing Agent for Steam Flooding

针对稠油蒸汽驱波及系数低、洗油效率低的问题,用石油树脂颗粒、阴离子型表面活性剂和水溶性高分子聚合物制备了耐高温封窜剂,将羧酸盐表面活性剂和磺酸盐表面活性剂按质量比1.5:1复配制得洗油剂。通过物理模拟实验研究了封窜剂和洗油剂复合调驱技术,考察了封窜剂的注入性和封堵性,以及复合调驱体系提高蒸汽驱采收率的能力。结果表明,封窜剂注入性和封堵性较好,在250℃高温下具有较好的耐冲刷性能。对于渗透率大于3.0μm^2的地层,封窜剂具有较好的注入性能;对于渗透率约为5.0μm^2的岩心,封堵率均能保持在90%以上,并且在250℃蒸汽冲刷20 PV后,封堵率降低值低于2%。洗油剂可使油水界面张力达到10^(-3) mN/m数量级,在90~250℃的洗油效率大于40%。蒸汽驱中单独使用洗油剂仅能提高采收率14%,而采用封窜剂和洗油剂复合调驱体系可提高采收率26%。稠油蒸汽驱中采用封窜剂和洗油剂复合调驱技术可有效封堵汽窜通道,提高驱油效率,改善稠油油藏蒸汽驱的开发效果。图2表4参15。

Aiming at the problems of low sweep coefficient and low oil-washing efficiency of steam flooding for heavy oil,a high-temperature-resistant channeling plugging agent was prepared with petroleum resin particle,anionic surfactants and water-soluble high molecular polymer.The carboxylate surfactant and the sulfonate surfactant were compounded with a mass ratio of 1.5∶1 to obtain oil-washing agent.The compound profile-control and oil displacement technology of channeling plugging agent and oil-washing agent was investigated by physical simulation experiment.The injection and plugging properties of channeling plugging agent,as well as the ability of the compound profile-control and oil displacement system to improve the recovery of steam flooding were investigated.The results showed that the channeling plugging agent had good injection and plugging properties,and had good erosion resistance at a high temperature of 250℃.The channeling plugging agent had better injection performance for the core with the permeability greater than 3.0μm2.The plugging rate could be maintained above 90%for the core with the permeability about 5.0μm2,and the reduction of plugging rate was less than 2%after flooded 20 PV steam at 250°C.The oil-washing agent could reduce the oil-water interfacial tension to 10-3 mN/m,and the oil-washing efficiency at 90—250℃was greater than 40%.The use of oil-washing agent alone in steam flooding could only increase the recovery by 14%,while the use of channeling plugging agent and oil-washing agent compound system could increase the recovery by 26%.The combination of channeling plugging agent and oil-washing agent in steam flooding could effectively block the steam channeling,increase oil displacement efficiency,and improve the development effect of steam flooding in heavy oil reservoir.