The bottom of corerecovery which means water will get back to the bottom core in about forty seconds, the core is now uncovered.
核心回收率的底部,意思是水会回到核心的地步,在40秒之内，核心现在已经没有覆盖的了。
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The problems of low drilling efficiency and low corerecovery due to borehole collapse were solved with pulling in casing while drilling through using combined BHA with casing.
Glass steel coring tool is specifically developed for improving the corerecovery of conglomeratic weak formation and the core integrality in Liaohe Oilfield.