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天然气地球科学 ›› 2012, Vol. 23 ›› Issue (4): 764–769.doi: 10.11764/j.issn.1672-1926.2012.04.764

• 天然气开发 • 上一篇    下一篇

考虑有效应力与含水饱和度的致密砂岩气层供气能力

游利军，李雷，康毅力，石玉江，张海涛，杨小明   

  1. 1.油气藏地质及开发工程国家重点实验室,西南石油大学，四川 成都 610500;
    2.低渗透油气田勘探开发国家工程实验室，陕西 西安 710018
  • 收稿日期:2012-03-27 修回日期:2012-05-17 出版日期:2012-08-10 发布日期:2012-08-10
  • 通讯作者: 游利军youlj0379@126.com. E-mail:youlj0379@126.com.
  • 作者简介:游利军（1976-），男，河南洛阳人，副教授，博士，主要从事非常规天然气、岩石物理,油气层保护理论与技术教学和科研工作.E-mail：youlj0379@126.com.
  • 基金资助:

    国家科技重大专项(编号：2011ZX05044；2011ZX05018-005-004HZ);国家“973”计划项目(编号：2010CB226705)联合资助.

Gas Supply Capacity of Tight Sandstone in Considering Effective Stress and Water Saturation

YOU Li-jun, LI Lei, KANG Yi-li, SHI Yu-jiang, ZHANG Hai-tao, YANG Xiao-ming   

  1. 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University,
    Chengdu 610500,China; 2.State Key Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Changqing Oilfield Company, PetroChina, Xi′an 710018, China
  • Received:2012-03-27 Revised:2012-05-17 Online:2012-08-10 Published:2012-08-10

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摘要：

致密砂岩天然气资源丰富，但渗透率低，纵向上气层多，采用多层合采时，各层供气能力存在差异。气藏开采过程中气层压力下降快，含水饱和度也会发生变化，影响各气层供气能力。选取鄂尔多斯盆地上古生界典型致密砂岩岩样，开展含水饱和度对致密砂岩岩样供气能力的影响实验，对比分析了有效应力与含水饱和度对不同渗透率级别岩样供气能力的影响。结果表明，有效应力增加，渗透率相对较低岩样产气贡献率明显下降，相对高渗岩样增加，有效应力增加加剧了岩样间供气能力差异；在原地有效应力条件下，随着含水饱和度升高，岩样供气能力显著下降，渗透率越低，供气能力下降也就越显著；渗透率级差越大，渗透率相对较低岩样产气贡献率就越低。

关键词: 致密砂岩气藏, 含水饱和度, 有效应力, 供气能力, 产气贡献率

Abstract:

Although there is abundant of natural gas in tight sand matrix,the gas supply capacity of each layer is different when adopting commingling production in the  multi-layer of tight sand gas reservoir.The gas supply capacity of each layer may be impacted by rapid decrease of reservoir pressure and change of water  saturation during production.We select the tight sandstone samples from Ordos basin to conduct the experiments so as to test the effect of water saturation on  gas supply capacity,and take a contrast of water saturation and effective stress on gas supply capacity of the tight sandstone samples with different  permeability.The results show that the effective stress severely impacts the gas supply capacity;with effective stress increase,the gas production for low  permeability cores decreases,but the gas production for high permeability cores increase.So the effective stress increase aggravates the difference between gas  supply capacities of different permeability rocks.Under in-situ effective stress condition,the gas supply capacity decreases significantly with water saturation  increase and permeability decrease.The smaller the permeability is，the more significant the gas supply capacity decreases.The bigger the permeability range of  core sample groups is,the more different the contribution rate of gas production is.

Key words: Tight sand gas reservoir;Water saturation, Effective stress, Gas supply capacity, Gas production contribution

中图分类号: 

  • TE348


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