摘要
以物理模拟为研究手段,开展不同原油黏度下的聚合物纳米球调驱可视化研究。结果表明:随着原油黏度增大,水驱效率降低,驱动剩余油所需要的能量逐渐增大,需要一定数量膨胀的聚合物纳米球的累积,不仅注入压力逐渐增大,而且压力波动幅度也逐渐增大;注入水从入口端呈反喇叭状向出口端推进,注入的膨胀聚合物纳米球大部分随注入水进入到高渗区,水驱扩大波及面积高渗区快于低渗区,随着后续注水的进行,高渗区水驱面积呈增加趋缓,低渗区逐渐扩大注入水波及面积,直至注水平稳;原油黏度越高,在水驱阶段越容易形成指进现象,微球调驱水相波及面积增幅越大,但对于低渗区,原油黏度越高,所需要的聚合物微球注入量或液流转向能力越大,否则将难以继续扩大低渗区的波及效率。
Physical simulation was used in the visualization research of polymer nanosphere profile control and displacement under different crude oil viscosity. The results showed that the higher the viscosity of the crude oil, the lower the water drive efficiency, the higher the energy required to drive the remaining oil, and the accumulation of a certain number of expandable polymer nanospheres was required, moreover, the amplitude of pressure wave increased gradually, the injected water advanced from the inlet to the outlet in a reverse trumpet shape, and most of the injected expandable polymer nanospheres entered the hypertonic zone with the injected water, with the subsequent water injection, the area of water flooding in the high permeability area increased slowly, and the area of water flooding in the low permeability area gradually increased until the injection water level was stable, in the stage of water flooding, the more easily the fingering phenomenon was formed, the larger the sweep area was, but for the low permeability area, the higher the crude oil viscosity was, the larger the polymer microsphere injection quantity or the liquid flow diversion capability was needed, otherwise it would be difficult to continue to expand the spread efficiency of low permeability zone.
作者
薛宝庆
李彦阅
吕鹏
王楠
黎慧
XUE Bao-qing;LI Yan-yue;LV Peng;WANG Nan;LI Hui(CNOOC Tianjin Branch,Tianjin 300452,China)
出处
《当代化工》
CAS
2021年第9期2070-2074,共5页
Contemporary Chemical Industry
基金
中海石油(中国)有限公司“三新三化”项目(项目编号:YXKY-SXSH-2019-TJ-01)。
关键词
聚合物纳米球
可视化实验
微球调驱
原油黏度
物理模拟
Polymer nanospheres
Visualization experiment
Microsphere profile control and displacement
Crude oil viscosity
Physical simulation
