纳米微球深部调驱技术在低渗透油藏的应用

Application of nano-microsphere deep control and flooding technology in low-permeability reservoirs

低渗透油藏长期注水开发后,受储层非均质性影响,局部多存在低效、无效注水循环,常规堵水调剖剂受注入性能与封堵强度的限制,难以动用油藏深部剩余油。纳米微球具有粒径小、可水化膨胀、易弹性形变等突出优势,能够实现逐级有效封堵。基于纳米微球调驱机理及粒径适配关系研究,结合胡A长4+5低渗透油藏地质条件和当前生产动态,优化出“小粒径、低浓度、长周期”的注入参数并开展矿场试验,通过持续注入,试验区块开发指标明显好转,同时针对裂缝发育井组定向开展单点调剖,更有利于井组产能及采收率的提高,该研究可为同类型油藏纳米微球深部调驱技术应用提供指导与参考。

After long-term water-flooding development in low permeability reservoirs,due to the influence of reservoir heterogeneity,local low efficiency and invalid waterflood circulation,conventional water plugging and profile control agents are limited by injection performance and plugging intensity,so it is difficult to mining the remaining oil in deep reservoirs.Nano-microsphere has the advantages of small particle size,hydration expansion,easy elastic deformation and so on,which can achieve effective plugging step by step.Based on the displacement mechanism and nanometer microspheres particle size adaptation studies,combined with Hu A Chang 4+5 low permeable reservoir geological conditions and the current production performance,optimize the"small size,low concentration,long cycle"injection parameters and field tests.After continuous injection,test block development index improved significantly.At the same time,the profile control is carried out for the well groups with fracture development.It is more conducive to the improvement of well productivity and recovery factor.This study can provide guidance and reference for the application of deep control and flooding technology of nano-microspheres in similar reservoirs.