CO2响应型β?环糊精材料用于稠油降粘

CO2?responsive beta?cyclodextrin materials for heavy oil viscosity reduction

摘要:

制备了一种环境友好型马来酸酐改性β?环糊精(MAH?β?CD),温和条件下将其与脂肪酸聚醚二胺 (JD230)静电作用合成了具有CO₂响应性的表面活性剂(MJD230)。它能与油形成稳定的水包油乳液进而有效降低溶液的表面张力。CO₂调控下,MJD230可重复用于稠油的乳化降黏和破乳。利用FT?IR对结构进行表征。通过观察降黏率和乳液粒径优化MJD230的合成条件,同时对降黏性能和稳定性进行考察。在质量分数为0.5%,油水体积比为3:7的条件下,MJD230稠油降黏率可达99.19%。利用pH值和电导率的可逆变化证明MJD230溶液对CO₂的响应性和重复性。这为表面活性剂驱油和CO₂捕集相结合提高稠油采收率提供了可行的途径。关键词：稠油；乳化；CO₂响应型表面活性剂；稠油降黏中图分类号：TQ630 文献标识码： A 文章编号：1003?5214 (2023) 05?0000?00

Abstract:

In this paper, an environmentally benign beta?cyclodextrin modified by maleic anhydride (MAH?β?CD) was prepared. A surfactant MJD230 was synthesized with CO₂ response through the electrostatic interaction between polyether diamine(Jeffamine D?230)and cyclodextrin modified by maleic anhydride under mild conditions. It effectively reduced the surface tension of aqueous solutions and aided the formation of a stable O/W emulsion. It shows switchability by bubbling CO₂, so that can be used repeatedly under the regulation of CO₂. The structure was characterized by FT-IR. The synthesis conditions of MJD230 were optimized via the viscosity reduction rate and emulsion particle size, and the viscosity reduction performance and stability were also investigated. Under the condition of mass fraction of 0.5% and oil-water volume ratio of 3:7, the viscosity reduction rate of MJD230 heavy oil can reach 99.19%. The reversible changes of pH and conductivity were used to prove the CO₂ responsiveness and repeatability of MJD230 solution. This provides the feasibility of a new enhanced heavy oil recovery technology combining surfactant flooding and CO₂ capture.