离子对缔合聚合物溶液黏度剪切保留率影响研究

Effect of ion on viscosity shear retention rate of associating polymer solution

薛新生 郭拥军 马军隆 冯茹森 张健

XUE Xinsheng GUO Yongjun MA Junlong FENG Rusen ZHANG Jian

西南石油大学研究生部，四川成都　610500 西南石油大学化工院，四川成都　610500 中国海洋石油研究中心，北京　100027

Graduate School of Southwest Petroleum University, Chengdu 610500, China School of Chemistry & Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China

针对渤海SZ36-1油田高温、高盐、大井距对注聚用聚合物剪切稳定性的要求，进行了SZ36-1油藏条件下，Na+、K+、Ca2+、Mg2+等离子对缔合聚合物AP-P4溶液黏度剪切保留率的影响研究。研究发现，影响缔合聚合物溶液黏度剪切保留率的关键因素是溶液中的Ca2+、Mg2+;在Na+、K+浓度小于10 000 mg/L时，其存在有益于提高溶液黏度的剪切保留率;Ca2+、Mg2+浓度超过400 mg/L时，溶液黏度的剪切保留率开始明显降低;在Ca2+、Mg2+浓度低于100 mg/L时，其存在有助于提高溶液黏度剪切保留率。在模拟渤海SZ36-1油田注聚水源井A15井的水质条件下，证实了Ca2+、Mg2+是影响缔合聚合物AP-P4黏度剪切稳定性的关键因素。

The characteristics of high temperature, high salt and wide well spacing in Bohai SZ36-1 oil field request good shear stability of injected polymer. Under reservior conditions, a.study was carried out on how the ion (including Na+, K+, Ca2+ and Mg2+) affected viscosity shear retention rate of associating polymer AP-P4 solution. It is found that the key element is Ca2+ and Mg2+ in the solution. Existence of Na+ and K+ can enhance shear retention rate when concentration is 10,000mg/L. Viscosity shear retention rate starts obviously to reduce when concentration of Ca2+ and Mg2+ is 400mg/L ,while Ca2+ and Mg2+ can enhance shear retention rate when concentration is 100 mg/L. Simulating water quality of the water source well A15 in the Bohai SZ36-1 oil field, it has been confirmed that Ca2+ and Mg2+ in the solution are the key factors to affect the viscosity shear stability of association polymer AP-P4.