摘要
大涝坝凝析油气田储层埋藏深,大部分井的生产气液比低,环空装有封隔器,常规方法对其积液情况及积液深度很难给出准确判断,为此,提出了一套适合于该区块的积液判断及深度计算方法。从井筒气液两相管流的理论出发,在对气井井筒压力分布与井筒积液关系的分析基础上,确定了在气井井筒无积液时优选压力分布模型的方法和原则,从而提出了利用计算压力和实测压力的相对比来判断积液并计算积液深度的新方法,并针对该区块的典型井进行了实例计算。综合分析结果表明:此方法不仅使该气藏低气液比井的井筒压力分布计算不准的现象得到了合理解释,还解决了低气液比油套不连通井的积液判断和积液深度的计算难题,深化了对气井积液现象的认识,该方法可以推广应用到其他气藏。
In the Dalaoba gas condensate field,the pay zones are buried so deep that the gas-liquid ratio is low for most wells and the annulus is equipped with the packer.It is difficult to use regular methods to predict liquid loading and calculate its depth.In view of this,a new method is designed for the prediction of liquid loading and the calculation of its depth in this zone.Firstly,based on the theory of wellbore gas-liquid two phase flow,the relationship is discussed between liquid loading and the pressure distribution on the wellbore.Secondly,the method and its rules are proposed for optimally selecting the model of pressure distribution when there is no liquid loading.Finally,the contrast between the actual and calculated pressures can help judge the liquid loading and calculate its depth.A real case study was carried out on the typical wells in this zone.A comprehensive analysis shows that this method explains the reason why the calculated pressure of a well with a low gas-liquid ratio is inaccurate and provides a new way for the judgment of liquid loading and the calculation of its depth in such wells with a low gas-liquid ratio and disturbed by the disconnection between casing and tubings.This study has made the phenomenon of liquid loading deeply understood.In addition,the application of this new method can be introduced to other similar gas reservoirs.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2011年第9期62-64,136-137,共3页
Natural Gas Industry
基金
中国石化先导项目"轮台凝析气田深层凝析气井积液监测技术及排液技术"(YC2008-122)的部分成果
关键词
大涝坝
凝析油气田
气井
气液比
压力
积液
深度
计算
Dalaoba,gas condensate,gas well,gas-liquid ratio,pressure,liquid loading,depth,calculation
