确定气井高速湍流系数的新相关经验公式

A New Correlation Equation for Determining High Velocity Turbulence Coefficient of Gas Wells

陈元千

Chen Yuanqian

中国石油勘探开发研究院

Research Institute of Exploration and Development , CNPC, Beijing 100083 , P. R. China

在井底附近地带,对于高速气体的流动,湍流或非达西流动的产生是不可避免的。湍流不仅增加了表皮系数,而且降低了气井的产能。新的确定气井高速湍流系数的相关经验公式,较以前文献的相关经验公式,具有更好的代表性,可以用于确定不同渗透率储层的高速湍流系数和非达西流动常数。

The turbulence or non-Darcy’ s flow are unaviliable for high-velocity gas flow at near wellbore zone. The high-velocity turbulence flow is not only increased skin factor , but also decreased productivity of gas wells.A new correlation equation for determining high-velocity turbulence coefficient is proposed in this paper , based on the testing data of one-dimension core through natural gas or air under surface conditions by references [1 - 5 ] . This correlation is more representative than previous correlation by references [ 6 , 7 ] . It may be used to determine high-velocity turbulence coefficient for different reservoirs’ permeability.