Abstract: In order to search for the best solution to improve the efficiency of supercritical CO2 extraction for oil cuttings, the focus is placed on the influence of temperature, pressure, time, entrainer and other key parameters on extraction efficiency. The experiments are done at different device temperature changes, pressure gradient changes, and three kinds of entrainment agents are introduced. The orthogonal testsare done at different extraction parameters, the oil content of the extracted cuttings and the recovery of the base oil components are measured by infrared spectrophotometry methods and infrared spectroscopic analysis were performed. The experiments show that 2-hour extraction can reduce the cuttings’ oil content to less than 0. 2% , when constant pressure at 10MPa, constant temperature at 45°C and the simultaneous addition of 2% non-polar entrainer. And the recovered base oil phase is similar to the white oil component, once used to formulate water-in-oil drilling fluid system, it is found that its performance will not be affected after rolling at 150°C for 16 hours.

Key words:  , supercritical CO₂, extraction, oil-bearing drill cuttings, entrainer

摘要：  为探求提高超临界CO₂萃取含油钻屑效率的最优方案，文章重点研究了萃取温度、萃取压力、萃取时间、挟带剂等关键参数对萃取效率的影响。根据CO₂相态变化，设定超临界CO₂萃取装置的温度、压力梯度变化， 同时引入3种挟带剂，开展不同萃取参数的正交实验，采用红外分光光度法检测萃取后钻屑含油量。实验结果表明，稳压 10 MPa、恒温45℃，同时加入2％的非极性挟带剂石油醚，连续萃取2ｈ后，钻屑含油量可降低至0.2％以 下，且回收后的基础油相与白油成分接近，重复配置的油包水钻井液体系经150 ℃热滚16ｈ后，检测流变、滤失等 性能均未受影响。

关键词:  超临界 CO₂, 萃取, 含油钻屑, 挟带剂