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《Natural Gas Industry》 2011-01
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Quantitative analysis of the capability of liquid removing from different-productivity gas wells

Liu Jie1,Liao Ruiquan1,Zhao Shengxiao2(1.School of Petroleum Engineering,Yangtze University,Jinzhou,Hubei 434023,China;2.Qinghai Oilfield Company,PetroChina,Dunhuang,Gansu 736200,China)  
Liquid loading is a serious problem in the development of mature gas fields.To avoid liquid loading in gas wells,many scholars at home and abroad have conducted their studies on the minimum unloading gas flow rate and built a series of corresponding mathematical models.However,the issue whether fluids can be taken up to the surface ground when the output of gas wells is larger than the critical flow has not yet been deeply discussed.For this reason,based on the mechanical analysis of liquid loading and by using the theory of multiphase flow,starting from the momentum equation of mist flow in the vertical pipe column,a mathematical model for calculating the maximum unloading gas rate is constructed and the corresponding solution is obtained by using VB programs.The calculation results and the corresponding analysis show that when the output of gas wells is larger than the minimum unloading gas flow rate,not all the fluids will be taken up to the wellhead.There is a maximum critical unloading gas flow rate,which will increase with the decrease of the wellhead pressure while decrease with the increase of tubing diameter.Therefore,the data about the critical unloading gas flow rate of gas wells can help engineers analyze the liquid loading.Accordingly,the timing for applying techniques of gas recovery by discharge water can be determined.This study is important in supporting and directing the stable development of gas wells.
【Fund】: 国家自然科学基金资助课题“复杂动态网络的优化计算及其应用”(编号:60873021)
【CateGory Index】: TE377
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