摘要
为了有效提高我国低渗、特低渗油藏采收率,提出了构筑低界面张力阴离子双子表面活性剂黏弹流体的思路,以满足驱油剂同时提高波及效率及洗油效率、注入性好、无色谱分离的要求。本文以阴离子双子表面活性剂分子结构对其溶液黏度、黏弹性、界面活性影响为研究基础,构筑了GCET黏弹流体,并评价了其主要性能及油藏环境适应性。研究表明,羧酸盐双子表面活性剂溶液流变性及界面活性优于磺酸盐双子表面活性剂的;疏水链碳数较大(m=18),间隔基团碳数适中(s=3)的羧酸盐双子表面活性剂溶液流变性能较好;疏水链碳数较大(m=18),间隔基团碳数较小(s=2)的羧酸盐双子表面活性剂溶液界面活性较高。以此,优化分子结构设计并构筑的GCTE流体具有良好的黏度行为、黏弹性、界面活性及油藏温度及矿化度适应性。在模拟矿化度(12000 mg/L)条件下,0.5%的GCTE黏弹流体黏度12.68 mPa·s;溶液黏弹性较好(=0.366<1、松弛时间=11.302 s);稳态油水界面张力达到2.93×10^-3mN/m。GCTE黏弹流体在非常规油藏提高采收率方面具有良好的应用前景。
In order to effectively improve the oil recovery of low permeability and ultra-low permeability reservoirs in China,the idea of constructing a low interfacial tension anionic Gemini surfactant viscoelastic fluid was proposed,so as to meet the requirements of oil displacement agent to improve sweep efficiency and oil washing efficiency,good injectivity and no chromatographic separation. Based on the research of the influence of the molecular structure of anionic gemini surfactant on its solution viscosity,viscoelasticity and interfacial activity,a GCET viscoelastic fluid was constructed,and its main properties and adaptability to the reservoir environment was evaluated. The results showed that the rheology and interfacial activity of carboxylate gemini surfactant solutions was better than that of sulfonate gemini surfactant solutions;the carboxylate gemini surfactant solution with a large number of carbons in the hydrophobic chain(m=18)and a moderate number of spacers(s=3)had better rheological properties;the carboxylate Gemini surfactant solution with a larger number of carbons in the hydrophobic chain(m=18)and a smaller number of carbons in the spacer group(s=2)had a higher interface activity. Based on this,the GCTE fluid optimized for molecular structure design and construction had good viscosity behavior,viscoelasticity,interfacial activity,and adaptability to reservoir temperature and mineralization. Under simulated mineralization(12000 mg/L),the viscosity of 0.5% GCTE viscoelastic fluid was 12.68 mPa·s;the solution had good viscoelasticity,being of 0.366 <1,relaxation time being of 11.302 s;the steady state oil-water interfacial tension reached up to 2.93 × 10^-3 mN/m. The GCTE viscoelastic fluid have a good application prospect in improving oil recovery in unconventional reservoirs.
作者
胡睿智
唐善法
金礼俊
MUSA Mpelwa
冯树云
姜昭文
HU Ruizhi;TANG Shanfa;JIN Lijun;MUSA Mpelwa;FENG Shuyun;JIANG Zhaowen(College of Petroleum Engineering,Yangtze University,Wuhan,Hubei 430100,P R of China;Hubei Cooperative Innovation Center of Unconventional Oil and Gas,Yangtze University,Wuhan,Hubei 430100,P R of China)
出处
《油田化学》
CAS
CSCD
北大核心
2020年第1期93-101,共9页
Oilfield Chemistry
基金
国家自然科学基金“阴离子双子表面活性剂黏弹流体提高非常规油藏采收率基础研究”(项目编号51774049)
国家自然科学基金“阴离子双子表活剂-纳米粒子构筑耐高温清洁压裂液基础研究”(项目编号51474035)。
关键词
阴离子双子表面活性剂
黏弹流体
黏度
黏弹性
油水界面张力
anionic Gemini surfactant
viscoelastic fluid
viscosity
viscoelasticity
oil-water interfacial tension
