利用回压试井资料确定气井生产期间井底流动压力的方法

A Method of Determining Bottom-hole Flowing Pressure by Using Back-pressure Testing Data

介绍了一种气井生产期间不进行井下测压即可确定井底流动压力和地层压力的新方法。通过对大量的气井回压试井测试资料的统计分析发现,每口气井一旦确定了生产管柱,井口压力即与井底流动压力存在某种特定的关系。通过这种关系,建立每口井生产期间井底流动压力与垂直管压力损失之间的函数关系,即可根据井口压力实时获取井底流动压力,并根据产能公式计算地层压力。该方法无需测压即可确定井底流压和地层压力,操作非常简单,无需额外的测压成本并可随时掌握井底流动压力,及时提供给气藏管理部门确保气藏合理开发,以获取最大的经济效益。

A new method was introduced for determining bottom-hole flowing pressure and formation pressure during the production of gas wells without bottom-hole pressure testing.It was found out from the statistics of back pressure testing data that for each gas well,if the special relationship between the production tubing-strings,well head pressure and bottom flowing pressure was determined,the function between bottom flowing pressure and vertical pressure loss was established with the relationship,then bottom flowing pressure and formation pressure could be obtained according to well head pressure and binomial deliverability equations.So this method is sample for operation without needs of pressure testing and the downhole pressure and formation pressure are obtained without increasing operation cost for getting bottom-hole flowing pressure.Reservoir management department can get real-time bottom flowing pressure to ensure the gas reservoir development for maximum economic interests.