苏里格气田气井产能评价新方法
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摘要
修正等时试井以其测试时间短等优点适用于低渗透气藏气井的产能试井,在国内外的气田中得到了广泛应用。针对长庆苏里格气田修正等时试井分析解释时,无法获得产能方程的现象以及出现的不合理结果,分析了可能导致问题发生的原因,参考前人的研究成果,从低渗透气井的渗流理论出发,推导并建立了低渗透气井的稳定点产能方程,可以代替修正等时试井进行产能评价。建立稳定点产能方程依据动态测试分析结果,不依赖严格的产能测试,提高了产能方程的应用范围,稳定点产能方程不仅可以计算气井的初始无阻流量,而且可以预测气井的动态产能,对于气井产能时效性强的苏里格气田更具有现实指导意义。对苏里格气田多口气井应用稳定点产能方程进行产能评价,并与产能试井结果进行对比,计算结果相近,证明新方法实用有效,具有应用价值。
As a method suitable for the productivity test of gas wells in low permeability gas reservoir, the modified isochronal flow test has been widely applied in foreign and domestic gasfields, due to its advantage of short testing time. In this paper,in view of the phenomenon that the deliverability equations can not be established and in view of irrational results is often derived from the interpretation of modified isochronal flow test data in the Changqing Sulige gasfield, the reasons which lead to irrational results has been analysed. Reference to previous research, a new stable point deliverability equation for gas wells in low permeability reservoirs was presented here on the basis of low permeability fluid flow mechanism,which can evaluate the gas well productivity instead of modified isochronal flow test. The stable point deliverability equations rely on dynamic measurement analysis but not strict deliverability testing, and the scope of application was widened. The new method can not only calculate the initial absolute open flow of gas wells, but also can predict the dynamic productivity of gas wells in Sulige gasfield. The new stable point deliverability equation has been applied to evaluate the productivity of several gas wells in Sulige gasfield, and the results is reasonable and reliable, so the method is proved to be practical and effective.
As a method suitable for the productivity test of gas wells in low permeability gas reservoir, the modified isochronal flow test has been widely applied in foreign and domestic gasfields, due to its advantage of short testing time. In this paper,in view of the phenomenon that the deliverability equations can not be established and in view of irrational results is often derived from the interpretation of modified isochronal flow test data in the Changqing Sulige gasfield, the reasons which lead to irrational results has been analysed. Reference to previous research, a new stable point deliverability equation for gas wells in low permeability reservoirs was presented here on the basis of low permeability fluid flow mechanism,which can evaluate the gas well productivity instead of modified isochronal flow test. The stable point deliverability equations rely on dynamic measurement analysis but not strict deliverability testing, and the scope of application was widened. The new method can not only calculate the initial absolute open flow of gas wells, but also can predict the dynamic productivity of gas wells in Sulige gasfield. The new stable point deliverability equation has been applied to evaluate the productivity of several gas wells in Sulige gasfield, and the results is reasonable and reliable, so the method is proved to be practical and effective.
引文
[1]庄惠农.气藏动态描述和试井[M].北京:石油工业出版社,2003.
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[5]冉新权,李安琪.苏里格气田开发论[M].北京:石油工业出版社,2012.
[2]谭中国,郝玉红.确定气井产能的简便方法[J].新疆石油地质,2006,27(6):726-727.
[3]黄全华,王富平.低渗气藏气井产能与动态储量计算方法[M].北京:石油工业出版社,2011.
[4]王卫红,沈平平,等.低渗透气藏气井产能试井资料分析方法研究[J].天然气工业,2005,25(11):76-78.
[5]冉新权,李安琪.苏里格气田开发论[M].北京:石油工业出版社,2012.