摘要
鉴于常规水驱后大量原油仍然滞留在岩石表面难以采出的问题,设计一种基于羟基阴离子化合物(1OH-1C)和延展型表面活性剂(S-C_(13)PO_(13)S)协同作用的新型超浸润驱油体系,测试驱油体系的界面张力、接触角和乳化性能,通过微观可视化驱油实验及岩心驱替实验,研究1OH-1C、S-C_(13)PO_(13)S及其复配体系的驱油效果与提高采收率机理。结果表明:1OH-1C在固体表面产生超浸润界面和静电分离压力,破坏原油与石英之间的强烈相互作用,剥离油膜;S-C_(13)PO_(13)S界面张力低,能够促进剩余油流动,并使其乳化,形成水包油型乳状液;1OH-1C和S-C_(13)PO_(13)S复配体系兼具超浸润性和低界面张力,通过协同作用有效提高采收率。低渗透天然岩心驱油实验表明,复配体系可在水驱基础上提高采出程度16.4个百分点,在低渗透油藏大幅度提高采收率方面具有广阔的应用前景。
Given that a large amount of crude oil remains on the surface of rocks and is difficult to produce after conventional waterflooding,a new superwetting oil displacement system incorporating the synergy between a hydroxyl anion compound(1OH-1C)and an extended surfactant(S-C_(13)PO_(13)S)was designed.The interfacial tension,contact angle and emulsification performance of the system were measured.The oil displacement effects and improved oil recovery(IOR)mechanisms of 1OH-1C,S-C_(13)PO_(13)S and their compound system were investigated by microscopic visualization oil displacement experiments and core displacement experiments.The results show that 1OH-1C creates a superwetting interface and electrostatic separation pressure on the solid surface,which destroys the strong interactions between crude oil and quartz to peel off the oil film.S-C_(13)PO_(13)S has low interfacial tension,which can promote the flow of remaining oil and emulsify it into oil-in-water emulsions.The compound system of 1OH-1C and S-C_(13)PO_(13)S has both superwettability and low IFT,which can effectively improve oil recovery through a synergistic effect.The oil displacement experiment of low-permeability natural core shows that the compound solution can increase the oil recovery by 16.4 percentage points after waterflooding.This new high-efficiency system is promising for greatly improving oil recovery in low-permeability reservoirs.
作者
周朝辉
张晓杰
张群
贾宁洪
韩璐
张磊
张路
吕伟峰
ZHOU Zhaohui;ZHANG Xiaojie;ZHANG Qun;JIA Ninghong;HAN Lu;ZHANG Lei;ZHANG Lu;LYU Weifeng(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;State Key Laboratory of Enhanced Oil and Gas Recovery,Beijing 100083,China;Department of Chemistry and Environment Engineering,Yingkou Institute of Technology,Yingkou 115014,China;Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China)
出处
《石油勘探与开发》
北大核心
2025年第5期1154-1165,共12页
Petroleum Exploration and Development
基金
国家重点研发计划项目(2019YFA0708700,2023YFF0614100)
中国石油科技重大专项(2021ZZ01,2023ZZ04)。
关键词
超浸润
羟基阴离子化合物
延展型表面活性剂
协同作用
驱油机理
化学驱
提高采收率
superwettability
hydroxyl anionic compound
extended surfactant
synergy
oil displacement mechanism
chemical flooding
improved oil recovery
