Liquid carbon dioxide thickening agent and preparation method thereof

The invention discloses a liquid carbon dioxide thickening agent and a preparation method thereof, aiming at the defects of poor fracturing and oil displacement effects and low buried viscosity of the existing liquid carbon dioxide, the invention combines a freeze-drying technology, utilizes a solvothermal method and takes methylbenzene as a solvent to successfully graft sulfydryl onto a long molecular chain so as to improve the oil displacement effect of the thickening agent. The preparation method is simple in operation, low in price, good in repeatability and suitable for batch production, and the thickening agent for liquid CO2 fracturing is prepared. 本发明公开了一种液态二氧化碳增稠剂及其制备方法，针对现有液态CO2压裂、驱油效果较差及埋藏粘度低的缺点，本发明结合冻干技术利用溶剂热法以甲苯为溶剂成功将巯基嫁接到长分子链上以提升增稠剂的驱油效果，制备出具有较小摩擦系数和较强携沙能力的液态CO2压裂用增稠剂，该方法操作简单，价格低廉，可重复性好，适合批量生产。