延缓交联弱凝胶调驱剂的研制与性能评价

Research of a retarding crosslink weak gel for conformance control and displacement and its performance evaluation

刘平德 张松 冯爱丽 秦杰

LIU Pingde ZHANG Song FENG Aili QIN Jie

中国石油勘探开发研究院，北京　100083 中国石油天然气集团公司采油采气重点实验室　100083 大庆油田有限责任公司第八采油厂，黑龙江大庆　163514

Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China Key Laboratory of Oil &

现有交联聚合物凝胶体系成胶时间短，调驱剂不能深入油藏实现深部放置，导致了水驱开发效果较差。考察了在一定温度、热稳定剂作用下，延缓有机复合交联剂NQJ与聚合物的交联反应，形成了适用于大庆萨尔图北部油田油藏的延缓交联弱凝胶体系。该体系地面黏度较低，便于现场注入，且具有较好的延缓交联效果，可实现大剂量深部调驱。研究结果表明：抗盐聚合物、交联剂与热稳定剂的质量分数分别为0.15%~0.25%、0.15%~0.2%与0.015%~0.025%时，形成的凝胶黏度大于5 000 mPa·s，成胶时间3~6 d可调，能够满足现场深部调驱要求。

Due to the short gelation time of the present cross-linked polymer gel system, conformance control agent cannot enter into deep reservoir, resulting in poor water flooding effect. By the crosslinking reaction between the retarding organic composite cross-linking agent NQJ and salt-resistance polymer under thermal stabilizers and specific temperature, the weak gel with space network structure is formed. The weak gel conformance control agent has low surface viscosity, easy injection on-site, and good delayed cross-linking effect, so it can achieve the high-dose injection. The research shows that the mass fraction of salt-resistance polymer, cross-linking agent, and the heat stabilizer are 0.15%-0.25%, 0.15%-0.2%, and 0.015%-0.025% respectively. The viscosity of gel is greater than 5000 mPa·s, and the gelation time is 3~6 days. The weak gel can meet the need of deep reservoir conformance control and oil displacement, and improve the water flooding effect of high water cut oil field.