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。
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 improve- ment of oil recovery, the experiments of small batch reactor, Accelerating rate calorimeter and single or double flooding were launched. The low temperature oxidation ability ofoil 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 ~C, the activation energy ofoil 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.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第5期130-134,共5页
Journal of Southwest Petroleum University(Science & Technology Edition)
关键词
特低渗油藏
空气泡沫
低温氧化
提高采收率
ultra-low permeability reservoir
air foam
low temperature oxidation
enhanced oil recovery
