多相泡沫体系调驱提高原油采收率试验研究

Study on Enhanced Oil Recovery in Profile Control and Flooding by the Multi-phase Foam System

关键词:  粒径  封堵能力  多相泡沫  采收率

Key words:  diameter of polymer microsphere  profile control ability  multi-phase foam system  EOR

摘要:

通过复配泡沫和聚合物凝胶微球形成多相泡沫体系,并进行了多相泡沫体系在多孔介质中的驱油实验。通过激光粒度分析仪对聚合物凝胶微球的粒径进行测量,其粒径分布均匀,且与地层孔喉匹配。针对多相泡沫的起泡能力和稳定性,采用搅拌法对其各组分的浓度进行优选。微球封堵试验表明,微球能在岩心中不断地封堵和运移,使注入压力和阻力系数增加,后续水驱仍有较高的残余阻力系数。在双管非均质驱油试验中,多相泡沫优先进入高渗管并具有良好的调剖效果,从而改善地层非均质性,使泡沫驱替低渗管,调剖与驱油结合,有效地提高原油采收率。

Abstract:

The multi-phase foam system is composed of gas-liquid foam and polymer microsphere and its enhanced oil recovery in porous medium was conducted in lab.The diameter of polymer microsphere was measured by laser particle size analyzer,the results show that the size is distributed evenly and matching the pore-scale of formation.The polymer microsphere plugging experiment results show that the microsphere can move and plug in the core,which increase the injected pressure and resistance coefficient,succeeding water flooding still has a high residual resistance factor.The paraller core EOR experiments show that the multi-phase foam system goes into the high permeation core and pulg it,and the heterogeneity has been improved,combining plugging with flooding,so the recovery is improved effectively.