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《Petroleum Geology & Oilfield Development in Daqing》 2006-06
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Calculation on change in borehole pressure of gas condensate well at the condition of phase change

ZHU Ju-hui,et al.(Postgraduate School of Southwest Petroleum University,Chengdu 610500,China)  
Gas condensate well has special characteristics of phase change in production process.When the whole fluid system pressure attained dew point pressure,condensate fluid drops out continuously,causing liquid content increase.In the past there was almost no such consideration in the process of dynamic simulation of gas condensate wellbore,so it is difficult to guarantee accuracy of simulation.This paper establishes analytic models of gas condensate well bore pressure and fluid phase change,calculates and analyzes component change of gas and liquid phases,and considers effect of phase change on wellbore pressure.It uses a new parameter of incremental ratio of gas/oil ratio,which describes separation of condensate oil in different section of wellbore.And calculates on phase change of gas and liquid phases by changing in heavy component content.It analyzes dynamic effect of different components on wellbore gradient so as to make simulation and calculation more close to the situation.
【Fund】: 四川省高校“天然气开采重点实验室”凝析气藏压裂优化设计(GPL04-09)
【CateGory Index】: TE331
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