摘要
本文利用生物显微镜、驱替装置等仪器从微观和宏观两方面研究了基于储层微结构改善的新型提高采收率技术,结合胶体化学理论、架桥封堵理论,利用双管驱替模型讨论了基于储层微结构改善的体膨颗粒的驱油机理。研究表明,该体膨颗粒以球状或类球状分散于水中,缓慢膨胀7d后基本保持稳定,体积膨胀倍数达27倍。体膨颗粒溶液注入渗透率极差为5的双管岩心模型后,高渗岩心的分流率由92%下降至46%,低渗模型的分流量由8%上升至54%,液流改向效果显著。在极差为5的双管岩心水驱至98%后注入0.3Pv、3000mg·L^-1的体膨颗粒溶液,提高采收率11.61%。非混相增粘、架桥封堵是该体膨颗粒膨胀前、后相对应的提高采收率机理。基于储层微结构改善,该技术能够有效改善储层吸水剖面,提高层内、平面水驱波及体积。
In this paper,a new enhanced oil recovery technology based on reservoir microstructure improvement was studied by means of microscopy and macro-displacement.The displacement mechanism of swellable particles were discussed by bridging theory,colloid and interfacial chemistry theory combined with doublet displacement model.The results show that the swellable particles are spherical or quasi-spherical in water.After 7 days of slow expansion,it is basically stable,and the volume expansion ratio reaches up to 27 times.After injection of swellable particles solution into doublet model with permeability difference of 5,the diversion rate of high permeability core decreases from 92%to 46%,and that of low permeability model increases from 8%to 54%.The flow diversion ability is remarkable.It improved 11.61%OOIP by injecting 0.3 Pv swellable particles solution with concentration of 3000 mg·L^-1 into doublet model with permeability difference of 5 after water flooding.Non-miscible viscosity increasing and bridging plugging are different mechanisms for enhancing oil recovery before and after expansion of the swellable particles.Based on the improvement of reservoir microstructures,the technology greatly improve the efficiency of follow-up water flooding.
作者
吕鹏
刘义刚
张云宝
高建崇
夏欢
LV Peng;LIU Yi-gang;ZHANG Yun-bao;GAO Jian-zhong;XIA Huan(Tianjin Branch of CNOOC(China)Ltd.,Tianjin 300452,China)
出处
《化学工程师》
CAS
2019年第10期80-83,共4页
Chemical Engineer
关键词
体膨颗粒
液流转向
注入性
提高采收率
驱油机理
swellable particles
expansion
flow diversion
enhanced oil recovery
oil displacement mechanism
