黑液体系驱油研究

黑液是碱法造纸时所产生的废液,具有潜在碱的性质,可作为三元复合驱的一种组分,配成黑液-表面活性剂-聚合物体系(简称黑液体系),用于驱油。本文用准三组分相图,针对新疆试验区条件,研究了这一体系的采收率增值等值图,得到优化配方。通过黑液体系各种性质等值图的研究,结合驱油产出液的分析结果和微观驱油的直接观察,证实了黑液体系主要通过低界面张力、乳化-携带、乳化-捕集、自发乳化、表面亲水性减小、刚性膜软化等机理提高原油的采收率。

A STUDY ON OIL DISPLACEMENT kY A BLACK LIQUOR SYSTEM

Black liquoris the waste water produced from alkaline papermaking mills. It behaves like a latent alkaline. Black liquor system is a combination of black liquor,surfactant polymercan be used as an oil displacement agent in a combination flooding. According to the condi-tions of Xinjiang pilot area,the optimum formula(formula 2-3) of black liquor system hasbeen ohtained by an analysis of the increment chorograms of recovery efficiency in the pseu-dotricomponent phase diagram. Main mechanisms in such a displacement include low interfa-cial tension,emulsification-entrainment, emulsification-entraprnent,spontaneous emulsifica-tion,reduction of water wettability,and softening of rigid membrane etc. Enhanced oil recov-ery of black liquor system have been confirmed by a combination of the study of variouschorograms of black liquor system with analysis of effluents of oil displacement and a directobservation of oil displacement in microscopic model.