摘要
低渗透率油藏的有效开发是提高油田采收率的关键挑战之一。通过实验方法探究了化学驱油技术在低渗透率油藏中的应用效果,着重研究了表面活性剂和聚合物溶液对驱油效率的影响。结果表明:化学驱油技术显著提高了低渗透率油藏的采收率,当表面活性剂质量分数为1.0%时,油水界面张力降至10.4 mN·m^(-1),驱油效率提高至85.3%;当聚合物质量分数为0.3%时,相对驱替效率提升至1.25倍;化学驱油能有效改善岩石的孔隙结构,使岩心样本的孔隙度从15%提升至20%,渗透率从49.5 mD增加至75.8 mD;碱性化学剂和盐类化学剂的使用能进一步提高采收率,尤其是当碱性化学剂质量分数达到1.5%和盐类化学剂质量分数达到0.3%时,采收率提高比例分别达到12.6%和13.6%。研究结果证实了化学驱油技术在提高低渗透率油藏开发效率方面的潜力,为实际应用提供了理论依据和技术支持。
The efficient development of low-permeability reservoirs is one of the key challenges in improving oil field recovery.In this paper,the application effect of chemical oil displacement technology in low permeability reservoirs was explored through experimental methods,the impact of surfactants and polymer solutions on oil displacement efficiency was investigated.Experimental results showed that chemical flooding technology significantly improved the recovery factor of low-permeability reservoirs,when the surfactant mass fraction reached 1.0%,the oil-water interfacial tension dropped to 10.4 mN∙m^(-1),and the oil displacement efficiency increased to 85.3%;when the polymer mass fraction was 0.3%,the relative displacement efficiency increased to 1.25 times;the chemical oil flooding could effectively improve the pore structure of rocks,increasing the porosity of core samples from 15%to 20%and the permeability from 49.5 mD to 75.8 mD;the use of alkaline chemicals and salt chemicals could further improve the recovery rate,especially when the mass fraction of alkaline chemicals reached 1.5%and the mass fraction of salt chemicals reached 0.3%,the recovery rate increased by 12.6%and 13.6%respectively.The research result confirms the potential of chemical flooding technology in improving the development efficiency of low-permeability reservoirs,and provides theoretical basis and technical support for practical application.
作者
张向宇
韩洪斗
唐洁云
崔向东
郭鹏超
熊梓丞
ZHANG Xiangyu;HAN Hongdou;TANG Jieyun;CUI Xiangdong;GUO Pengchao;XIONG Zicheng(PetroChina Liaohe Oilfield Branch,Panjin Liaoning 124010,China)
出处
《当代化工》
CAS
2024年第9期2129-2133,共5页
Contemporary Chemical Industry
基金
辽宁省科技攻关专项(揭榜挂帅)项目(项目编号:2023JH1/10400003)。
关键词
低渗透率油藏
化学驱油
表面活性剂
聚合物溶液
驱油效率
Low permeability reservoir
Chemical oil displacement
Surfactant
Polymer solution
Oil displacement efficiency
