劣质原油破乳剂的筛选及电脱盐工艺优化

Screening of Demulsifiers and Optimization of Electrodesalination Process for Poor Quality Crude Oil

以某中东劣质混合原油为研究对象,通过热沉淀化学法对7种破乳剂进行了筛选,通过电脱盐小试装置考察了温度、破乳剂加入量、注水量、电场强度及混合强度等工艺条件对原油电脱盐效果的影响,并通过光学显微镜观察原油脱前脱后的状态。结果表明:最佳操作条件为温度135℃,破乳剂加入量15μg·g^(-1),注水量7%(质量分数),强电场强度以及作用时间分别为1150 V·cm^(-1)、3 min,弱电场强度以及作用时间分别为350 V·cm^(-1)、2 min。经过三级电脱盐脱水后,原油中的盐质量浓度为1.9 mg·L^(-1)。

The effects of process conditions such as temperature,emulsion breaker addition,water injection,electric field strength and mixing strength on the electrodesalting effect of crude oil were investigated by a small pilot device of electrodesalting,and the state of crude oil before and after desalting was observed by optical microscopy.The experimental results showed that the optimum operating conditions were 135℃,15μg·g^(-1)of emulsion breaker addition,7%of water injection,1150 V·cm^(-1)and 3 min of electric field strength and action time,respectively,and 350 V·cm^(-1)and 2 min of weak electric field strength and action time,respectively.The salt mass concentration in the crude oil was 1.9 mg·L^(-1)after the three-stage electric desalination and dehydration.