驱油用低界面张力生物表面活性剂鼠李糖脂体系的研究

PREPARATION AND PROPERTIES OF LOW INTERFACIAL TENSION BIOSURFACTANT SOLUTIONS FOR EOR

应用反离子协同效应原理，用０．２％－１．０％鼠李糖脂配制成功两种低界面张力生物表面活性剂驱油体系。配方１使用鼠李糖脂原样，配方２使用部分转化为离子型的鼠李糖脂，油水界面张力均降至２×１０（－２）ｍＮ／ｍ，耐温１５－８０℃。配方２的室内驱油率比水驱高出３５％。

Of six biosurfactants collected Rhamonolipid(Rh) with the highest interfacial tension(IFT) against oil, ndecane, 2.6 mN/m is selected out to prepare flooding solutions for EOR. Two series of low IFT biosurfactant systems are obtained and both have low IFTs￣0. 02 mN/m at 35℃ and Rh concentrations 0. 2-1. 0%, heing temperature-resistant up at least to 80℃. The lst formulations contain Rh and sodium dodecylsulfonate in ratios 4000:1 and the 2nd──Rh, ammonium or sidium bicarbonate(to convert partially acid-form Rh to salt-form) and urea as auxilliary in ratios 500:1:10. In a laboratory core test on formulation 2 an enhancement in oil recovery 25%on the hasis of water follding is observed.