Research on Variance Principle of Critical Producing Pressure Drop of Horizontal Well in Gas Reservoir with Bottom Water

Abstract:

According to material balance principle, gas/water bearing height in gas reservoir with bottom water could be deduced. Additionally, sweep efficiency could be approximately determined, then based on the equivalent flowing resistance method and critical vertical velocity of bottom water drive, computational model of Critical Producing Pressure Drop during the development of gas reservoir with bottom water could be derived. Therefore, the variance principle of Critical Producing Pressure Drop of horizontal well can be expressed quantitatively, and this paper also analyzes that it is influenced by the ratio of vertical permeability to horizontal permeability, the difference between water and gas density, the ratio of water viscosity to gas viscosity and height for bottom water coning. The results could provide guidelines for the determination of reasonable producing pressure drop and producing rate of horizontal well in gas reservoir with bottom water.

• Periodical: Advanced Materials Research (Volumes 616-618)
• Pages: 674-679
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.616-618.674
• Online since: December 2012
• Authors: Keliu Wu, Xiang Fang Li, Xiao Ting Gou
• Keywords: Critical Producing Pressure Drop, Gas Bearing Height, Gas Reservoir with Bottom Water, Horizontal Well, Recovery Efficiency

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