含聚采出液电脱水处理实验研究

Experimental Study on Electric Dehydration Process of Produced Liquid Containing Polymer

含聚采出液稳定性强、电脱水处理难度大。通过分析含聚采出液的特性,模拟现场流程建立了微型动态电脱试验装置,开展电脱水工艺优化研究。结果表明:电脱水器温度为110℃,压力为0.4 MPa,电脱停留时间30 min,在场强600～1 200 V/cm条件下,破乳剂加量250 mg/L,电脱后原油含水率≤1%,水中含油质量浓度≤750 mg/L,AC/DC电脱比AC电脱的脱水率高、功耗低。采用交直流电脱方式在脱后油中含水率、水中含油质量浓度、脱水率及电耗等方面均优于单一交流电脱方式;电极设置为垂挂式电极,强电场区的电场强度为1 000～1 200 V/cm,脱出原油含水率≤1%,电脱水效果好;含聚采出液含水率>30%后,电脱水电场强度提升困难,进入二级电脱水器的含聚采出液含水率应≤30%。

The polymer flooding reductive liquid has strong stability and difficulty in electric dehydration treatment. By analyzing the characteristics of produced liquid containing polymer, a micro-dynamic electric dehydration test device is established by simulating the on-site process, and an electric dehydration process optimization study is carried out. The results show that under conditions that the temperature of the electric dehydrator is 110°C, the pressure is 0.4 MPa, the retention time is 30 min, field strength is 600 to 1200 V/cm, the amount of demulsifier is 250 mg/L, after electric dehydration the water cut of crude oil is not more than 1%, and the concentration of oil in the water is not more than 750 mg/L. Compared with AC electric dehydration, the dehydration ratio of AC/DC is higher and the power consumption is lower. The AC-DC method is superior to the single AC method in water contained in oil,oil contained in water,dehydration rate and power consumption. When the electrode is set as a hanging one,the electric field strength in the strong electric field is 1 000 to 1 200 V/cm, the water content of the crude oil after dehydration is not more than 1%, and the electric dehydration effect is good. After the water content of the produced liquid containing polymer is more than 30%, the electric dehydration field strength is difficult to upgrade, so the water cut of the polymer-containing produced liquid entering the secondary electric dehydration device should be not more than 30%.