摘要
针对胜利油田低渗透油藏水驱开发中低注入能力、低采液速度、低采出程度的难题,提出了新型胺醚类双子表面活性剂驱油技术。对驱油用新型胺醚类双子表面活性剂进行了分子结构设计,评价了不同分子结构时的界面性能,优选出界面性能最好的样品G-3,进行了不同浓度时的乳化性能和驱油性能评价,并结合微观刻蚀玻璃模型阐明了驱油机理。实验结果表明:质量分数为0.2%的新型胺醚类双子表面活性剂溶液能将油水界面张力降低到0.0039 mN/m,此时能与原油形成稳定的乳状液,乳状液液滴粒径为12μm;对于渗透率为6.966 mD的岩心,水驱后注入0.5 PV质量分数为0.2%的新型胺醚类双子表面活性剂G-3溶液,再次水驱采收率提高值达9.6%,降压率达17.4%;微观驱油机理为降低油水界面张力和残余油乳化聚并。该驱油技术在胜利油田低渗透区块进行了矿场试验,实施后区块水井的注入能力提高了2倍,油井的日增油量为5.7 t/d,含水率下降了11.0%,截至2023年6月区块累积增油量为1791 t,取得良好的开发效果。
To address the challenges of low injection capacity,low fluid recovery rate,and low recovery in the water flooding development of low-permeability reservoirs in Shengli Oilfield,this paper proposed an oil displacement technology with new amineether gemini surfactants.The molecular structure was designed on the new amine-ether gemini surfactant for oil displacement,and the interfacial properties of different molecular structures were evaluated.The sample G-3 with the best interfacial properties was selected,and the emulsification and oil displacement performance were evaluated at different concentrations.The oil displacement mechanism was elucidated by combining micro etched glass models.The experimental results showed that the new amine-ether gemini surfactant with a concentration of 0.2%can reduce the interfacial tension between oil and water to 0.0039 mN/m,forming the stable emulsion with crude oil,and the particle size of lotion drops is 12μm.For the postflood core with a permeability of 6.966 mD,the G-3 solution of the new amine-ether gemini surfactant with a concentration of 0.2%is injected at 0.5 PV,and the recovery can increase by 9.6%and the pressure reduces by 17.4%after water flooding again.The micro oil displacement mechanisms are the reduction of the interfacial tension between oil and water and the residual oil emulsification and coalescence.A field test was conducted in the low-permeability block of Shengli Oilfield.After implementation,the injection capacity of the water wells in the block was doubled.The daily oil production of the oil wells was 5.7 t/d,and the water cut decreased by 11.0%.Up to June 2023,the cumulative oil production in the block had been 1791 t,achieving good development effect.
作者
张翔宇
孙玉海
渠慧敏
毛振强
徐永辉
齐迪
王聪
ZHANG Xiangyu;SUN Yuhai;QU Huimin;MAO Zhenqiang;XU Yonghui;QI Di;WANG Cong(Chunliang Oil Production Plant,Shengli Oilfield Company,SINOPEC,Binzhou City,Shandong Province,256500,China;SINOPEC Research Institute of Petroleum Engineering,Shengli Oilfield Company,Dongying City,Shandong Province,257000,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2024年第6期153-159,共7页
Petroleum Geology and Recovery Efficiency
基金
中国石化前瞻项目“低渗水驱油藏改善渗流功能性减阻剂研究”(P22182)。
关键词
分子结构设计
高活性
强乳化
低渗透
新型胺醚类双子表面活性剂
性能评价
molecule structure design
high activity
strong emulsifying
low permeability
new amine-ether gemini surfactant
performance assessment
