Influence of Back Pressure on Testing Starting Pressure Gradient in Low Permeability Gas Field

Jian Yan; Xiao Juan Liu

doi:10.4028/www.scientific.net/AMR.524-527.1460

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 524-527Influence of Back Pressure on Testing Starting...

Influence of Back Pressure on Testing Starting Pressure Gradient in Low Permeability Gas Field

Abstract:

For the existence of formation water, the capillary force increases when the gas flow in the cores, so the flow may display starting pressure gradient. However, during the lab testing, sometimes it is found that the starting pressure gradient changes in different test conditions: when the outlet pressure is atmosphere, only the water saturation reaches critical value (Sw)_c, the quasi starting pressure exists; but when the outlet pressure is not atmosphere; it is easy to find the quasi staring pressure in the same water saturation. And the quasi starting pressure under the later condition is larger than that in former condition. It is also found that the quasi starting pressures are both power function to the ratio of core coefficient and water saturation. The experimental results provide some theoretical references for recognizing the flow characteristics in low permeability gas reservoirs.

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Periodical:

Advanced Materials Research (Volumes 524-527)

Pages:

1460-1464

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.524-527.1460

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Online since:

May 2012

Authors:

Jian Yan, Xiao Juan Liu

Keywords:

Back Pressure, Gas Slippage, Low-Permeability Gas Reservoir, Quasi Starting Pressure Gradient

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