注入水水质对聚合物黏度的影响及水质处理剂的筛选

Effect of Injection Water on Polymer Viscosity and Screening of Water Treatment Agents

王增林 田玉芹 靳彦欣 刘希明 史树彬 宋岱锋 梁 严

WANG Zenglin TIAN Yuqin JIN Yanxin LIU Ximing SHI Shubin SONG Daifeng LIANG Yan

胜利油田孤东和孤岛油区污水水质明显影响了配注聚合物体系的黏度，亟需研究不同水质因素对黏度的影响并寻求有效的水质处理剂。通过室内黏度和老化稳定性测试，研究了注入水中Fe2+/Fe3+、S2-和氧含量等水质内部因素对聚合物体系黏度的影响，确定了保证聚合物溶液具有较高黏度的含量上限，并结合相应的要求优选了适合的除氧剂和除铁剂，在现场条件下验证其适应性。研究结果表明，Fe2+/Fe3+、S2-和氧含量对聚合物体系黏度有显著的影响，要使现场配注的聚合物溶液具有较高的黏度，Fe2+和Fe3+含量最高应分别不超过0.5 mg/L和2mg/L，S2-含量应控制在1 mg/L以内，溶解氧含量应控制在0.3 mg/L以下。Fe2+/Fe3+和S2-的作用时间对聚合物溶液黏度没有明显的影响。硫脲和大港亚铁离子处理剂PP-I分别是与聚合物体系配伍性良好且应用效果最好的除氧剂和除铁剂，现场适应性较好。通过加入化学除氧剂和除铁剂能有效控制现场注入水中的氧含量和Fe2+/Fe3+含量在较低水平，使配制的聚合物溶液具有较高的黏度，适于在油田聚合物驱和化学驱使用现场污水配液时使用。图3表6参17

The sewage quality of Gudong and Gudao reservoirs in Shengli oilfield significantly affected the viscosity of prepared polymer system. It was urgent to study the effects of different inherent factors on the viscosity and seek effective water treatment agent. In this work，the effects of ferrous ion/iron ion（Fe2+/Fe3+），sulfur ion（S2-）and dissolved oxygen in the injection water on polymer viscosity were experimentally studied by the measurements of viscosity and aging stability，and the upper limitation to achieve the higher polymer viscosity was determined. According to the limitation and requirement，preferentially suitable oxygen scavenger and iron remover were obtained and the applicability was further verified under field conditions. The results showed that the contents of Fe2+/Fe3+，S2- and dissolved oxygen had noticeable effect on polymer viscosity. To achieve the higher viscosity of the polymer solutions prepared on-site，the highest content of Fe2+ and Fe3+ should not exceed 0.5 and 2 mg/L，respectively. And the content of S2- and dissolved oxygen should be separately controlled within 1 and 0.3 mg/L. Moreover，with the extension of acting time，both Fe2+/Fe3+ and S2- only had slight effect on the viscosity. Thiourea and Dagang PP-I was respectively chosen as the oxygen scavenger and iron remover，which had good compatibility with the polymer and exhibited good field adaptability. By adding chemical oxygen scavenger and iron removal agent，the contents of dissolved oxygen and Fe2+/Fe3+ in injected water could be effectively controlled at a low level，so that the formulated polymer solution had a high viscosity，which was suitable for the on-site sewage dosing of oilfields in polymer and chemical flooding.

10.19346/j.cnki.1000-4092.2019.04.022