西南石油大学学报(自然科学版)

• 石油与天然气工程 • 上一篇    下一篇

特低渗油藏空气泡沫驱提高采收率实验研究

王杰祥,王腾飞,韩蕾,任文龙   

  1. 中国石油大学(华东)石油工程学院,山东青岛266580
  • 出版日期:2013-10-20 发布日期:2013-10-20

Experimental Study of Improved Oil Recovery Through Air Foam
Flooding in Ultra-low Permeability Reservoir

Wang Jiexiang, Wang Tengfei, Han Lei, Ren Wenlong   

  1. College of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China
  • Online:2013-10-20 Published:2013-10-20

摘要:

长庆油田五里湾一区块是一主力区块,为特低渗岩性油藏,孔隙结构差,非均质性严重,水驱开发难度大,油
藏采收率低。为进一步提高油藏采收率,模拟其油层条件,开展了氧化管、加速量热仪和单双管驱油实验,主要研究了
原油的低温氧化性能及特低渗油藏空气泡沫驱提高采收率的规律。实验结果表明,五里湾一区油藏原油在油藏条件
下即能发生氧化反应,且当温度达到100 ℃左右时氧化反应速率迅速增加,原油活化能E=61 354 J/mol;特低渗油藏水
驱后转空气泡沫驱能进一步提高采收率,幅度可达20%,且油藏渗透率越高,空气泡沫驱提高采收率幅度越大;空气
泡沫的注入时机对原油采收率影响显著,开发后期转空气泡沫驱,原油最终采收率更高,对特低渗油藏的开发更有利。

关键词: 特低渗油藏, 空气泡沫, 低温氧化, 提高采收率

Abstract:

Wuliwan-1 block is a main reservoir in Changqing oilfield. It is an ultra-low permeability lithologic reservoir with
bad pore configuration. The block is a heterogeneous reservoir with low oil recovery. With the purpose of further improvement
of oil recovery,the experiments of small batch reactor,Accelerating rate calorimeter and single or double flooding were
launched. The low temperature oxidation ability of oil and air foam EOR regular pattern of ultra-low permeability reservoir was
researched. The results show that the low temperature oxidation can happen in the reservoir condition,and the oxidation rate
will increase fast when the temperature reaches 100 ℃,the activation energy of oil E=6135 4 J/mol. The injection of air foam
after waterflooding will improve oil recovery obviously in ultra-low permeability reservoir,with the improvement amplitude
reaching to 20%. The higher of the reservoir permeability,the larger of the oil recovery of air foam flooding. The injection
time of air foam has a significant impact on the oil recovery. It is more benefit to inject air foam in the production tail,in order
to enhance the oil recovery.

Key words: ultra-low permeability reservoir, air foam, low temperature oxidation, enhanced oil recovery