超临界二氧化碳增稠剂的制备与性能
Preparation and Performance of Supercritical Carbon Dioxide Thickener.
作者信息
Liu Bin, Wang Yanling, Liang Lei
机构信息
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China.
出版信息
Polymers (Basel). 2020 Dec 28;13(1):78. doi: 10.3390/polym13010078.
The low sand-carrying problem caused by the low viscosity of supercritical carbon dioxide (SC-CO) limits the development of supercritical CO fracturing technology. In this study, a molecular simulation method was used to design a fluorine-free solvent-free SC-CO thickener 1,3,5,7-tetramethylcyclotetrasiloxane (HBD). Simulations and experiments mutually confirm that HBD-1 and HBD-2 have excellent solubility in SC-CO. The apparent viscosity of SC-CO after thickening was evaluated with a self-designed and assembled capillary viscometer. The results show that when the concentration of HBD-2 is 5 wt.% (305.15 K, 10 MPa), the viscosity of SC-CO increases to 4.48 mPa·s. Combined with the capillary viscometer and core displacement device, the low damage of SC-CO fracturing fluid to the formation was studied. This work solves the pollution problems of fluoropolymers and co-solvents to organisms and the environment and provides new ideas for the molecular design and research of SC-CO thickeners.
超临界二氧化碳（SC-CO₂）粘度低导致的携砂能力不足问题限制了超临界CO₂压裂技术的发展。在本研究中，采用分子模拟方法设计了一种无氟无溶剂的SC-CO₂增稠剂1,3,5,7-四甲基环四硅氧烷（HBD）。模拟和实验相互证实，HBD-1和HBD-2在SC-CO₂中具有优异的溶解性。使用自行设计组装的毛细管粘度计评估增稠后SC-CO₂的表观粘度。结果表明，当HBD-2的浓度为5 wt.%（305.15 K，10 MPa）时，SC-CO₂的粘度增加到4.48 mPa·s。结合毛细管粘度计和岩心驱替装置，研究了SC-CO₂压裂液对地层的低伤害。这项工作解决了含氟聚合物和助溶剂对生物体和环境的污染问题，并为SC-CO₂增稠剂的分子设计和研究提供了新思路。
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