摘要
为解决海上含油钻屑处理难题,利用超临界CO2萃取工艺对海上含油钻屑萃取除油进行研究。通过分析超临界CO2不同萃取条件对废弃油基钻屑萃取的影响,及基油在超临界CO2中的溶解度,得到如下结论:在给定的因素水平内萃取温度、萃取压力和萃取时间对萃取效果的影响主次顺序为萃取温度>萃取压力>萃取时间;满足一级海域排放要求的最佳萃取工艺条件为萃取压力25 MPa、萃取温度60℃、萃取时间80 min,在该工艺条件下钻屑平均残油率为0.71%;基油在不同存在条件时溶解度大小顺序为基油独立存在>基油存在于干钻屑>基油存在于含水钻屑浆体;若要提高超临界CO2的除油效果,则应尽量降低含油钻屑的含水率;用Chrastil方程计算得到的溶解度与实验室测得的溶解度相对误差最高为2.46%,最低仅0.40%,平均相对误差为1.57%,因此该方程具有良好的预测性。研究结果可为超临界CO2萃取随钻处理设备试制和现场最佳处理参数调整提供指导。
To address offshore oily cuttings treatment,the supercritical CO2 extraction process is investigated.By analyzing the effects of different extraction conditions of supercritical CO2 on the extraction of waste oily cuttings and the solubility of base oil in supercritical CO2,the following conclusions are drawn:at a given factor level,the influence on the extraction performance is extraction temperature>extraction pressure>extraction time.The optimal extraction process for meeting the first-class sea area emission requirements has an extraction pressure of 25 MPa,a extraction temperature of 60℃,and a extraction time of 80 min.Under this condition,the average cuttings residual oil ratio is 0.71%.The solubility of the base oil in different conditions is:base oil>base oil in the dry drill cuttings>base oil in the aqueous cuttings slurry.To improve the de-oiling performance of the supercritical CO2,the water content of the oily cuttings should be reduced as much as possible.The maximum relative error between the solubility calculated by the Chrastil equation and the measured solubility in the laboratory is 2.46%,the lowest relative error is only 0.40%,and the average relative error is 1.57%,proving a good predictability of the equation.The study results can provide guidance for the machining of supercritical CO2 extraction equipment and the adjustment of the on-site processing parameters.
作者
张杰
张羽臣
邢希金
王超
苗典远
李振卫
Zhang Jie;Zhang Yuchen;Xing Xijin;Wang Chao;Miao Dianyuan;Li Zhenwei(Engineering Technology Company of CNOOC Energy Technology&Services Limited;CNOOC Tianjin Company;CNOOC Research Institute Co.,Ltd.)
出处
《石油机械》
北大核心
2019年第11期52-58,共7页
China Petroleum Machinery
基金
国家科技重大专项“海上稠油油田高效开发钻采技术”(2016ZX05025-002)
关键词
含油钻屑
超临界CO2
萃取
基油
溶解度
oily cuttings
supercritical CO2
extraction
base oil
solubility
