延缓交联弱凝胶调驱剂的研制与性能评价

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。

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

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.