支化预交联凝胶颗粒微观驱油机理可视化实验  

Visual experimental study on microscopic oil displacement mechanism of branched-preformed particle gel

作　　者：赵方剑[1,2] 侯健[1] 元福卿 王代刚 刘永革 ZHAO Fangjian;HOU Jian;YUAN Fuqing;WANG Daigang;LIU Yongge(School of Petroleum Engineering,China University of Petroleum,Qingdao 266580,China;Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying 257015,China;Unconventional Oil and Gas Scienceand Technology Institute,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [3]中国石油大学(北京)非常规油气科学技术研究院,北京102249

出　　处：《断块油气田》2022年第4期567-571,共5页Fault-Block Oil & Gas Field

基　　金：国家科技重大专项课题“高温高盐油田化学驱提高采收率技术”(2016ZX05011-003);中国石化非均相复合驱提高采收率示范工程项目课题“聚驱后油藏非均相复合驱研究与应用”(P19007-3)。

摘　　要：由于良好的黏弹性、耐温抗盐性和悬浮性能,支化预交联凝胶颗粒(B-PPG)作为驱油剂已广泛应用于三次采油领域。文中将B-PPG岩心驱替实验与CT扫描技术相结合,研究了B-PPG在真实岩心驱替过程中的微观驱油机理。实验结果表明:与水驱相比,驱替至残余油阶段,B-PPG驱采收率提高了16.0百分点。基于CT扫描微观可视化研究,制定了剩余油赋存形态的划分标准,发现B-PPG颗粒能以暂堵—变形—运移的方式从岩石表面剥离更多连片的剩余油,使剩余油呈现更低的接触面积比,驱替至残余油阶段时,形态复杂的多孔状剩余油成为主要赋存形态。Because of good viscoelasticity,temperature resistance,salt resistance and suspension performance,branched-preformed particle gel(B-PPG)as oil displacement agents have been widely used in the tertiary oil recovery field.Combined the core displacement experiments of B-PPG with CT scanning technology in this paper,the microscopic oil displacement mechanism of B-PPG during the real core displacement process is studied.The experimental results show that compared with water flooding,B-PPG flooding recovery is increased by about 16.0 percentage points from displacement stage to residual oil stage.Based on the microscopic visualization study of CT scanning,classification standard of residual oil occurrence state is set.It is believed B-PPG can peel more contiguous residual oil from the rock surface in the way of temporary plugging,deformation and migration,which makes residual oil present a lower contact area ratio.The porous residual oil with complex shape after B-PPG flooding is main occurrence state from displacement stage to residual oil stage.

关 键 词：支化预交联凝胶颗粒 微观驱油机理 剩余油分布特征 CT扫描 岩心驱替 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]