含聚污水配制稀释聚合物的可行性

Feasibility of Dilute Polymer Systems Prepared with Polymer-Containing Oilfield Wastewater

何金钢 杨晶 唐生 袁琳 姜丽丽

HE Jin-Gang YANG Jing TANG Sheng YUAN Lin CHAI Hai-Chuan

为研究大庆油田聚合物驱油过程中含聚污水配制聚合物体系的可行性，通过配制等浓度的驱油体系，对体系的黏度和抗剪切性能、黏弹性、稳定性、分子线团尺寸等性能参数进行测定，在此基础上进行了注入能力和驱油效果评价。结果表明：不同水质配制稀释聚合物体系的聚合物性能、注入能力和驱油效果为：清水配制、深处理污水稀释体系均优于聚合物浓度为0 的污水配制、稀释体系和用生化水配制、稀释体系；在配制浓度相同的条件下，聚合物溶液体系的性能随配液污水中聚合物浓度升高而增强，污水中的残余聚合物具有良好的增黏性。含聚污水配制稀释聚合物在大庆油田具有广泛的适用性，针对大庆油田二类油层，在综合考虑聚合物溶液的注入能力和驱替效果的前提下，建议采用含聚合物浓度为200率400 mg/L的物化污水配制、稀释聚合物体系，能够在等聚合物干粉用量条件下实现最佳的综合利益。

In order to study on feasibility of dilute polymer systems prepared with polymer-containing oilfield wastewater in the process of polymer flooding in Daqing oilfield，polymer solutions systems the same concentrati on with were prepared，and the viscosity，shear-resistance，viscoelasticity，stability，molecular siz，the injection ability and recovery efficiency of the polymer solutions were measured. The results showed that system prepared with the clean water and diluted with deep treated sewage was superior to the symtem prepared and diluted with wastewater at the polymer concentration of 0，and superior to the system prepared and diluted with biochemical wastewater in the experiment of polymer property test，injection ability and recovery efficiency. Residual polymer in the wastewater could increase the viscosity of the system. The higher the concentration of residual polymer，the higher the property of the polymer system，when the polymer system was at the same preparation of concentration. Dilute polymer systems prepared with polymer-containing wastewater would be widely applied in Daqing oilfield. on comprehensive consideration of polymer injectivity and recovery efficiency，it was advised to prepare and dilute the polymer system with the wasterwater containing 200—400 mg/L residual polymer in Daqing oilfield.