黑液体系驱油研究

A STUDY ON OIL DISPLACEMENT kY A BLACK LIQUOR SYSTEM

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。

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.