大直径孔硬岩钻进技术现状及发展

Status and Development of Large Diameter Hard Rock Drilling Technique

通过对国内外近年来在大直径孔硬岩钻进中主要采用的施工法、钻进设备和工艺的介绍及经济效益的分析对比，提出了在大直径硬岩钻进中应根据不同情况采用不同的钻进方法及多工艺施工。特别强调了“梅花点全套管施工法”在我国推广的技术经济意义．

With introduction of the main construction method,drilling equipment and technique used inlarge diameter hard rock drilling at home and abroad in the recent years,and comparison of the economical bene-fit,it is proposed that different drilling methods and the multi-process construction should be used to cope withdifferent conditions in large diameter hard rock drilling。 Special emphasis is put on the technical and economicalsignificance of popularization of ,multi-hole all casing construction method