大牛地致密低渗透气藏启动压力梯度及应用

doi:10.11743/ogg20050523

Abstract

Abstract:

Start-up pressure gradient of the tight gas reservoirs in Daniudi gas field decreases with increasing effective permeability under constant water saturation,and increases with increasing water saturation.The calculation formula for the drainage radius of gas well at production plateau is deducted from unstable percolation(theory).If start-up pressure is taken into consideration and gas well production is identical,the drainage radius of gas well at production plateau increases with effective permeability.If effective permeability is identical,the drainage radius of gas wells at production plateau decreases with increasing gas well production.The minimum well spacing at a certain proration condition can be calculated by the drainage radius of gas well at production plateau.The production plateau of gas well will not be shortened by well interference only when the real well spacing is larger than minimum well spacing.

Key words: start-up pressure gradient, minimum well spacing, gas drainage radius, tight gas reservoir, Daniudi

CLC Number:

TE112.3

Wang Xibin, Liu Chuanxi, Zheng Rongchen. Start-up pressure gradient of tight gas reservoirs in Daniudi gas field and its application method[J]. Oil & Gas Geology, 2005, 26(5): 698-702.

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Start-up pressure gradient of tight gas reservoirs in Daniudi gas field and its application method

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