首页|致密油藏CO2驱响应性防气窜体系的制备及性能

致密油藏CO2驱响应性防气窜体系的制备及性能

扫码查看
以3-二甲胺基丙胺(NNDP)和油酸为原料,制备了具有叔胺结构的CO2响应性单体N,N-二甲基油酸酰胺丙基叔胺(DOAPA),将其与阴离子表面活性剂对甲苯磺酸钠(SPTS)复配,构建了具有CO2响应性的蠕虫状胶束(CO2-TWMS).通过考察CO2-TWMS与CO2接触前后的电导率、化学结构和微观形貌变化表征了体系的响应性,结合其表面活性变化及致密基质/裂缝双重介质CO2驱替与CO2-TWMS防气窜过程中的压力和采收率变化,揭示了 CO2-TWMS防气窜性能与机制.结果表明,当n(SPTS)∶n(DOAPA)=1∶1时,CO2-TWMS的黏度最大(4125 mPa·s).CO2和N2能够刺激CO2-TWMS电导率在0.90~1.95 mS/cm之间可逆变化,诱导微观形貌在蠕虫状胶束和球形胶束间转换.此外,CO2能够将CO2-TWMS临界胶束浓度(CMC)从0.63 mmol/L(未通入CO2)降至0.25 mmol/L,最低表面张力从30.2 mN/m(未通入CO2)降至29.1 mN/m,CO2-TWMS在气液界面的吸附效率和效能增强,有利于胶束的形成.在致密基质/裂缝双重介质中,CO2诱导蠕虫状胶束形成,增大驱替过程中的压力,扩大CO2驱替波及率,采收率提高22.6%.
Preparation and properties of responsive channeling prevention system for tight oil reservoir CO2 flooding
CO2-responsive worm-like micelle(CO2-TWMS)was constructed by mixing CO2-responsive monomer N,N-dimethyl oleic amide propyl tertiary amine(DOAPA)with tertiary amine structure,which was prepared from 3-dimethylaminopropylamine(NNDP)and oleic acid,with anionic surfactant sodium p-toluenesulfonate(SPTS).The responsiveness of the system was characterized by the changes in conductivity,chemical structure and micro-morphology before and after its contact with CO2.The anti-channeling performance as well as the mechanism of the system were analyzed by combining the changes in surface activity,pressure,and recovery efficiency in the process of CO2 displacement in dense matrix/crack medium and CO2-TWMS channeling prevention.The results showed that CO2-TWMS system with n(SPTS)∶n(DOAPA)=1∶1 exhibited the highest viscosity of 4125 mPa·s.CO2 and N2 could stimulate reversible changes in electrical conductivity between 0.90 and 1.95 mS/cm,inducing the micromorphology transformation between wormlike and spherical micelles.In addition,CO2 reduced the critical micelle concentration from 0.63 mmol/L to 0.25 mmol/L,and the lowest surface tension from 30.2 mN/m to 29.1 mN/m.The adsorption efficiency and efficacy of the system at the gas-liquid interface were enhanced,which was conducive to the formation of micelles.In the dense matter-fracture medium,CO2 induced wormlike micelle formation,increased the pressure difference during displacement,expanded the CO2 displacement sweep efficiency,and increased the recovery rate by 22.6%.

wormlike micellesCO2 responsivenesstight oil reservoiranti-gas channelingoil field chemicals

杜代军、方泽洲、章洋阳、蒲万芬、张辉、朱建林

展开 >

西南石油大学油气藏地质及开发工程全国重点实验室,四川成都 610500

西南石油大学石油与天然气工程学院,四川成都 610500

长庆化工集团有限公司,陕西西安 710200

蠕虫状胶束 CO2响应性 致密油藏 防气窜 油田化学品

国家自然科学基金

52274041

2024

精细化工
大连化工研究院设计院 中国化工学会精细化工专业委员会 辽宁省化工研究院

精细化工

CSTPCD北大核心
影响因子:0.557
ISSN:1003-5214
年,卷(期):2024.41(5)
  • 17