龙虎泡油田活性水驱油室内实验研究

针对大庆外围低渗透油田注水压力高、吸水能力差以及水驱采收率低等问题,选取龙虎泡油田进行活性水驱油室内物理模拟实验研究。表面活性剂筛选实验结果表明,十二烷基苯磺酸钠配制的活性水溶液/原油体系界面张力可达0.2041mN/m,且与地层水配伍性良好,比水驱采收率提高16.6%。驱油实验结果表明,水驱速度、活性水浓度、活性水注入量、注入时机均对驱油效果产生一定的影响,当水驱速度为1.0mL/min、活性水浓度为0.3%、活性水注入量为0.3PV时驱油效果最佳。现场实验应选取低含水井进行活性水驱油,当含水率较高时,适当提高活性水浓度以保持开发效果。

Laboratory study on oil displacement with active water in Longhupao Oilfield

Aimed at the problems of water injection displacement for low permeability reservoir in Daqing Oilfields, such as high water injection pressure, low water injectivity and low oil recovery, a laboratory experimental study is conducted for displacing crude oil in Longhupao Oilfield by active water flooding. Surfactant screening result shows that the interface tension of active water/crude oil system, where sodium dodecyl benzene sulfonate （SDBS） is used as surfactant, can reach 2.041 ×10^-1 mN/m. SDBS has good compatibilities with formation water and the active water flooding can reach an oil recovery increment of 16.6% higher than that of water flooding. The result of oil displacement experiment shows that active water injection rate, active water concentration and active water injection amount have effects on oil displacement efficiency, of which the optimal values are 1.0 mL/min, 0.3% and 0.3 PV respectively. Active water injection timing also has some influence. Oil production wells with low water content should be chosen to carry out active water flooding in situ and active water concentration should be augmented when water content increases.