西南石油大学学报(自然科学版)

• 油气化学工程 • 上一篇    下一篇

室内注二氧化碳微观驱油机理研究

肖朴夫1 *,杨正明2,王学武2,戴兴星3   

  1. 1. 中国科学院渗流流体力学研究所,河北廊坊065007;2. 中国石油勘探开发研究院廊坊分院,河北廊坊065007;
    3. 中国石油新疆石油勘察设计研究院(有限公司),新疆乌鲁木齐830000
  • 出版日期:2015-08-01 发布日期:2015-08-01
  • 通讯作者: 肖朴夫,E-mail:xiaolove99@qq.com
  • 基金资助:

    国家油气重大专项(2011ZX05013 006);中国石油天然气集团公司重大基础攻关课题(2014B 1203)。

A Laboratory Study on the Micro Mechanism of Oil Displacement with CO2 Flooding

Xiao Pufu1*, Yang Zhengming2, Wang Xuewu2, Dai Xingxing3   

  1. 1. Institute of Porous Flow and Fluid Mechanics of Chinese Academy of Sciences,Langfang,Hebei 065007,China
    2. Research Institute of Petroleum Exploration and Development-Langfang,Langfang,Hebei 065007,China
    3. Xinjiang Petroleum Servey and Design Institute(Company Limited),PetroChina,Urumqi,Xinjiang 830000,China
  • Online:2015-08-01 Published:2015-08-01

摘要:

通过大庆外围特低渗透储层岩芯一维物理模拟实验,研究注水、注气、注水转注气这3 种方式的驱油微观机
理,对现场注水转注CO2 提出可参考性建议。实验中主要利用了CO2 的萃取、降黏等特点,与水驱相比,CO2 驱驱油
效率更高,增油效果明显。实验表明:对于低渗透储层,注水开发效果最差,约为40%;不同注水时机转气驱效果均好
于水驱,而且注水时机越早采出程度越高,在10% ~20% 含水率转注气能有较好的经济效益;注气驱采出程度最好且
采出程度都能达到67% 左右。通过核磁信号测量,对比不同开发方式的剩余油分布可以得出,水驱和气驱动用的主要
都是大孔隙中的油,而水驱转气驱由于CO2 的波及范围更广,能对小孔隙中的部分原油进行动用。

关键词: CO2 驱油, 微观驱油机理, 可动流体, 低渗透油藏, 核磁共振

Abstract:

Through one-dimensional physical simulation experiment with the cores of ultra low permeability reservoir in the
peripheral part of Daqing,this paper studies the micro mechanism of oil displacement mechanism by water flooding、CO2
flooding and CO2 flooding after water injection,furthermore,the suggestion for the field application of gas flooding after
water injection is put forward. The main advantage of this experiment is reducing oil viscosity and extraction of CO2,etc.
Compared with water flooding,CO2 flooding oil displacement is more efficient with notable oil increment. Result shows that:
for low permeability reservoir,the effect of water flooding is the worst,about 40%,at different time of water injection gas
driving can lead to better effect,the earlier timing of water injection the better effect,to have better economic benefits the rate
of water content should be 10%~20%;flooding recovery degree is best by gas injection,can reach to about 67%. By means of
NMR,we can compare the different development ways,CO2 displacement and water displacement extracts most of movable
fluid in macro pores,however,the CO2 can increase the sweep volume effectively after water injection,which also make the
parts of the small pore crude oil become movable.

Key words: CO2 flooding, the micro mechanism of oil displacement, moveable fluids, low permeability reservoir, nuclear
magnetic resonance