Shao Minglu, Wang Youqi, Liu Ping, Fu Lipei, Zhu Tongyu, Li Xiaoxiao
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China.
Research and Development Center for the Sustainable Development of Continental Sandstone Mature Oilfield by National Energy Administration, Beijing 102206, China.
ACS Omega. 2023 Jun 5;8(23):21113-21119. doi: 10.1021/acsomega.3c02053. eCollection 2023 Jun 13.
Ionic liquid as a chemical flooding agent has broad application prospect in enhancing oil recovery. In this study, a bifunctional imidazolium-based ionic liquid surfactant was synthesized, and its surface-active, emulsification capacity, and CO capture performance were investigated. The results show that the synthesized ionic liquid surfactant combines the characteristics of reducing interfacial tension, emulsification, and CO capture. The IFT values for [Cmim][Br], [Cmim][Br], and [Cmim][Br] could decrease from 32.74 mN/m to 3.17, 0.54, and 0.051 mN/m, respectively, with increasing concentration. In addition, the emulsification index values are 0.597 for [Cmim][Br], 0.48 for [Cmim][Br], and 0.259 for [Cmim][Br]. The surface-active and emulsification capacity of ionic liquid surfactants improved with the increase in alkyl chain length. Furthermore, the absorption capacities reach 0.48 mol CO per mol of ionic liquid surfactant at 0.1 MPa and 25 °C. This work provides theoretical support for further CCUS-EOR research and the application of ionic liquid surfactants.
离子液体作为一种化学驱油剂在提高采收率方面具有广阔的应用前景。在本研究中，合成了一种基于咪唑鎓的双功能离子液体表面活性剂，并对其表面活性、乳化能力和CO捕集性能进行了研究。结果表明，合成的离子液体表面活性剂兼具降低界面张力、乳化和CO捕集的特性。随着浓度的增加，[Cmim][Br]、[Cmim][Br]和[Cmim][Br]的IFT值可分别从32.74 mN/m降至3.17、0.54和0.051 mN/m。此外，[Cmim][Br]的乳化指数值为0.597，[Cmim][Br]为0.48，[Cmim][Br]为0.259。离子液体表面活性剂的表面活性和乳化能力随烷基链长度的增加而提高。此外，在0.1 MPa和25°C下，每摩尔离子液体表面活性剂的吸收容量达到0.48 mol CO。这项工作为进一步的CCUS-EOR研究和离子液体表面活性剂的应用提供了理论支持。
