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低渗非均质油藏注气提高采收率实验研究
引用本文:王杰祥,杜建德,王腾飞,陈征,李玉英.低渗非均质油藏注气提高采收率实验研究[J].科学技术与工程,2014,14(18).
作者姓名:王杰祥  杜建德  王腾飞  陈征  李玉英
作者单位:中国石油大学(华东),中国石油大学(华东),中国石油大学(华东),中国石油大学(华东),中国石油大学(华东)
摘    要:针对长庆油田某区块低渗透裂缝性油藏裂缝发育、非均质性严重的特点,通过实验研究了注入时机对氮气驱油效率的影响,优选氮气驱注入方式并对气液比和段塞大小进行了优化。实验结果表明:N2注入时机对原油采收率有较大影响,N2注入时机应尽早。气液交替注入方式更有利于低渗油藏特别是非均质油藏的开发。气液比和段塞大小对氮气驱开发效果均有显著影响,优选结果是气液比1∶1,氮气段塞个数为5。

关 键 词:低渗透  非均质  注气  提高采收率
收稿时间:2014/2/13 0:00:00
修稿时间:6/5/2014 12:00:00 AM

Experimental Research On Improving Recovery Of Low Permeability And Heteroneous Reservoir By Gas Injection
Abstract:As to the obvious charateristics offracture abundance and severe hetorogeneity in certain blockoffracture reservoir with low permeability of Changqing oilfield, this paper studied the effect of injection time on nitrogeon flooding efficiency with physical experiments, optimized the injection ways of nitrogeon flooding and the gas-liquid ratio coupled with the size of slugs.The experimental results show that the injection time of N2 has significant effect on the oil recovery. That the N2 should be injected in the early stage of water producing by the way of gas alternating liquid injection can be more infavor of the development of low-permeability reservoir, especially for that of heterogeneous reservoir. The gas-liquid ratio and the size of nitrogeon slug also have siginificant effect on the oil recovery, and the optimum gas-liquid ratio and the number of slug are respectively 1:1 and 5.
Keywords:low permeability  heteroneous reservoir  gas injection  EOR technology
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