For the gas flow controlled by the closed boun&dary,after the completion of gas testing and shut-in to obtain the origi-nal formation pressure,the pressure draw down curves can be divided into three stages:unsteady state,transit state and pseudo-steady state.The pseudo-steady state is called elastic two-phase state,and the pressure within the well control range of the elastic two-phase state decreases at a constant velocity.This article established the general formulas for the stable rate and variable rate elas-tic two-phase method of gas wells,based on the stable rate elastic two-phase method represented by pressure first power,pressure square and pseudo pressure proposed by Chen Yuanqian,and the variable rate elastic two-phase method represented by pressure first power proposed by Blasingame.The practical application shows that the general formula provided in this paper are practical and ef-fective.
关键词
气井/定产量/变产量/拟压力/压力一次方/压力平方/弹性二相法
Key words
gas well/stable rate/variable rate/pseudo-pressure/pressure one power/pressure squared/elastic two-phase method
维普
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