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

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  • 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 date: 2012-03-27

  Revised date: 2012-05-17

  Online published: 2012-08-10

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.

Cite this article

YOU Li-jun, LI Lei, KANG Yi-li, SHI Yu-jiang, ZHANG Hai-tao, YANG Xiao-ming . Gas Supply Capacity of Tight Sandstone in Considering Effective Stress and Water Saturation[J]. Natural Gas Geoscience, 2012 , 23(4) : 764 -769 . DOI: 10.11764/j.issn.1672-1926.2012.04.764

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