卵砾石地层是钻探工程中常见的一种典型的不稳定地层。
Gravel strata is a kind of typical instable layer in drilling engineering.
本文介绍一种新的钻探松散地层护壁方法——套管护壁“三板斧”。
This paper introduces a new wall protection method for drilling loose strata casing pipe wall protection.
在砂卵石地层中勘察钻探时，要解决三个关键性的问题：一是钻进进尺问题；
There have three decisive questions need to solve while drilling in sand gravel layer. The first question is drilling footage.
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