异步交联调驱体系影响因素及性能评价　　

Influencing factor and cross-linking performance evaluation of asynchronous cross-linking profile control and flooding system

张祖国 王增宝 吴川 赵修太 高元 张洋

ZHANG Zuguo WANG Zengbao WU Chuan ZHAO Xiutai GAO Yuan ZHANG Yang

中国石化石油勘探开发研究院，北京　100083 中国石油大学石油工程学院，山东青岛　266580 中国石化石油工程技术研究院，北京　100101 胜利油田采油工艺研究院，山东东营　257000

Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China College of Petroleum Engineering,China University of Petroleum, Qingdao 266580, China Petroleum Engineering Technology Research Institute, SINOPEC, Beijing 100101, China Oil Production Technology Research Institute, Shengli Oilfield, SINOPEC, Dongying 257000, China

为改善目前常规交联聚合物体系成胶时间短、成胶强度不佳的问题，使用聚合物、有机铬和有机酚醛为主剂制备了一种异步交联聚合物调驱体系，通过成胶强度测试及扫描电镜等方法考察了体系的交联特性、影响因素及调驱性能。结果表明，异步交联体系交联时，体系成胶强度呈双“台阶”式变化，生成的冻胶微观结构致密，结构硬朗。异步交联体系可在地层温度50~90 ℃、Na+质量浓度≤35 000 mg/L、Ca2+质量浓度≤1 500 mg/L、pH为4~8条件下稳定成胶，封堵率高达95.33%，且体系具有较好的选择性封堵性能，水驱后体系能较大幅度地提高采收率。低于60 ℃时异步交联体系的成胶时间在300 h以上，其“异步”和“多次”交联特征使其适用于深部地层调驱。

To solve some problems of the common used cross-linking polymer system such as shorter gel time and lover gel strength, an asynchronously cross-linking polymer profile control and flooding system, which consisted of partially hydrolyzed polyacrylamide, organic chromium, organic phenolic resin, was developed. The cross-linking property, influencing factors, profile control and flooding performance were tested via gel strength tested and scanning electron microscopy analysis. The results showed that the course of reaction between polymer and organic chromium/organic phenolic resin, belongs to asynchronous reaction, two steps are presented with the increase of gel strength and the gel which formed through asynchronous reaction would not dehydrate and its microstructure was tightly. Gel showed high strength when Na+ concentration was below 35 000 mg/L, Ca2+ concentration was below 1 500 mg/L, temperature was between 50 ℃ and 90 ℃ and pH was in the range of 4 and 7. The profile control and flooding core flooding experiment showed that the plugging rate of asynchronous cross-linking polymer system was 95.33% and it had good performance of selective water shut off. The gel time of asynchronous cross-linking polymer system was longer than 300 h when temperature was below 60 ℃. The system could be used to deal with deep profile control and flooding problem of the deep layer.