中深层调剖调驱用JRGW凝胶体系的研制

Development of JRGW Gel System for Medium and Deep Profile Control and Flooding

本文研制了双活性与三活性基团交联剂复合而成的JRGW凝胶体系,通过调驱剂流变性的评价,即采用振荡剪切的方法测定弹性模量G′值确定凝胶强度。实验发现复合交联剂其抗剪切后强度保留率可达85%。重点分析了矿化度、溶解氧、SRB菌对交联聚合物的影响,并提出了解决办法。其中使用螯合剂和抗盐聚合物消除高价金属离子不利影响,将矿化度对强度的影响降低至5%。加入杀菌剂较回注水暴氧可更好的消除SRB菌影响。使用调节稳定剂调节凝胶最佳成胶PH值(6.5),消除溶解氧影响,凝胶在95℃、120℃下静态稳定成胶可达11个月。综合分析通过调整聚合物分子量的办法,调整凝胶强度与初始粘度,满足油田现场需求。实验发现小分子量聚合物体系较降低大分子量聚合物浓度体系,注入效果将更为优异。

In this paper,we developed a JRGW gel system with double-active and three-reactive group crosslinking agent.The gel strength was determined by measuring the G′value of elastic modulus through evaluating the rheological properties of the displacement agent,i.e.the oscillating shear method.The experimental results show that the strength retention rate of the composite crosslinker can reach85%after shearing resistance.The effects of salinity,dissolved oxygen and SRB on cross-linked polymers were mainly analyzed,and the solutions were proposed.Wherein,eliminating the adverse effects of high-valence metal ions by using of chelate agents and salt-resistant polymer so as to reduce the effect of mineralization degree on strength to5%.The addition of bactericide can eliminate the effect of SRB bacteria better than the back-injection of water and oxygen.The optimumgel forming pH(6.5)was adjusted by adjust stabilizer to eliminate the effect of dissolved oxygen,and the gel was statically stabilized at95℃and120℃for11months.Comprehensivly analysis the method of adjusting the molecular of the polymer,approach to adjust the gel strength and initial viscosity,so as to meet the field needs.It is found that the injection effect of small molecular polymer system is better than that of low molecular polymer concentration system.