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卵石层是常规定向钻穿越施工的禁区,采用常规工艺扩孔时,因泥浆不能够支撑卵石而形成管线回拖所必需的环形空间,基本无法施工。本文以长庆-乌海-临河输气管道工程黄河定向钻穿越为例,介绍了采取安装套管的方法穿越卵石层,保证钻导向孔、扩孔和回拖的施工技术。
The pebble layer is a forbidden area for conventional directional drilling through construction. When the conventional process reaming, the annular space necessary for the pipeline to be towed back is formed due to the mud being unable to support the pebble, and the construction is basically impossible. Taking the Yellow River directional drilling crossing of Changqing - Wuhai - Linhe Gas Pipeline Project as an example, this paper introduces the construction technology of installing the casing to cross the pebble layer to ensure the guide hole, reaming and backhoe drilling.