弱碱三元污水稀释弱碱三元复合驱体系的可行性*

Feasibility of Diluting Weak ASP Systems with Weak ASP Wastewater

何金钢

HE Jingang

随着弱碱三元复合驱的规模不断扩大，弱碱三元复合驱的采出液处理问题日益凸显，为研究弱碱三元污水 稀释弱碱三元体系驱油的可行性，采用不同类型的污水稀释弱碱三元驱油体系，评价了不同污水稀释三元体系 的黏性特征、界面活性和驱油能力，并通过现场试验进一步验证。研究结果表明：悬浮物含量100 mg/L、含油50 mg/L的弱碱三元污水回注油层的渗透率下限是100×10-3 μm2，当渗透率高于300×10-3 μm2时，三元污水可顺利注 入。三元污水较深度污水稀释三元体系的增黏性略低、稳定性好、抗剪切性能好、分子线图尺寸小、黏弹性略低； 界面活性范围相同、界面活性稳定性更好、乳化性能更好、抗吸附性能相同。在室内实验和现场试验中都表现出 了三元污水稀释三元体系注入能力更好、含水降低幅度更低的特点。因此，采用弱碱三元污水稀释弱碱三元体 系回注大庆油田二类油层具有技术和经济可行性。图15表7参21

With weak ASP flooding scale expanding unceasingly，the treatment problem of the weak ASP flooding produced fluid highlighted increasingly. In order to study feasibility of Diluting weak ASP system with weak ASP wastewater，the ASP system was diluted with different wastewater，and the viscosity characteristics，interface activity and oil displacement ability was evaluated， and the further validation was carried out through field test. The results showed that the lower limit of permeability of weak ASP wastewater injection reservoir with suspended substance content of 100 mg/L and oil content of 50 mg/L was 100×10-3 μm2，and when the permeability increased up to 300×10-3 μm2，the weak ASP wastewater could be injected smoothly. Compared with the weak ASP system diluted with deeply treated wastewater，the weak ASP system diluted with weak ASP wastewater had the following characteristics，slightly lower viscosity，better stability，better shear resistance，smaller molecular diagram size and slightly lower viscoelasticity. The interfacial activity and adsorption resistance of two kinds of systems was the same，and the interfacial activity stability and the emulsification performance of the latter was better. The results of laboratory and field experiments showed that the injection capacity of the latter was better and the decrease of water cut was larger. In a word，it is technically and economically feasible diluting weak ASP system with weak ASP wastewater and reinjecting the II oil layer in Daqing oilfield.

10.19346/j.cnki.1000-4092.2020.03.017