高含水原油电脱水试验研究

Experiment of High- water Crude Oil Electric Dehydration

随着井液含水上升和采油聚合物增加,油田脱水设备的数量和体积也逐渐增多和加大,增加了建设成本.为解决这一问题,通过在分离器罐下部和上部分别布置绝缘电极和金属电极,并采用绝缘电极、绝缘电极与金属电极组成的组合电极进行高含水原油脱水试验.结果表明：针对海上油田陆丰原油,单独采用绝缘电极,在电压（1 000～5 000 V）、水的质量分数（10％ ～ 60％）、脱水温度（45～90℃）和沉降时间（5～50 min）不同的条件下,高含水乳化液脱后水的质量分数最低能降低到1.5％.而采用此组合电极,在绝缘电极电压3000 V、金属电极1000V、温度80℃和沉降时间30 min条件下,对高含水原油进行脱水处理,可直接将原油的脱后水的质量分数降至0.5％以下,达到原油外输的要求.

With rising water in well liquid and increasing polymer in oil production, the quantity and size of dehydration equipment have to be increased, which increases the capital investment. To solve this problem, the insulation electrode is installed at the bottom of separation tank and metal electrode is provided at the top of the tank, and high - water crude oil dehydration experiment has been performed with insulation electrode and combination of insulation electrode and metal electrode. The results demonstrate that the water in high - water emulsion can minimally be reduced to 1.5% for offshore Lufeng Crude Oil with insulation electrode at different voltage （ 1 000 - 5 000 V）, different water content （ 10% - 60% ）, different dehydration temperature （45 - 90 ℃） and different settlement time （5 -50 minutes）. With combination of insulation electrode and metal electrode, the water in dehydrated crude oil can be reduced to lower than 0.5% at 3 000 V insulation electrode voltage, 1 000 V metal electrode voltage, 80 ℃ temperature and 30 minutes settlement time. The dehydrated crude oil meets the specifications for transportation.