Modified isochronal well test plays an important role in productivity evaluation of gas field .
修正等时试井在气田产能评价中发挥了相当重要的作用.
In this song , each measure is isochronal , namely , four beats per measure .
这首歌每一小节都是等长的，也就是说一小节四拍。
Productivity equation serves as the basis for gas reservoir engineering calculation . To derive jingbian gasfield productivity equation , correction isochronal testing and systematic well testing are normally used at early stage of development .
