梧桐庄矿大直径排水孔工程钻探施工技术

Drilling Construction Technology of Large Diameter Drainage Hole in Wutongzhuang Mine

摘要:

介绍了梧桐庄矿区孔深646 m、终孔直径526 mm两口排水孔的钻探施工技术。该2口排水孔深度大，孔径大，垂直度要求高，地层软硬互层变化较大，易缩径，穿层钻进时易形成孔斜，施工难度大，通过采用先用小径钻进、后扩孔的施工方法，并采取合理的钻具组合和泥浆，制定有效的防斜技术措施等，顺利完成排水孔施工，施工质量满足设计要求。

Abstract:

The paper introduced the drilling construction technology of drainage holes in Wutongzhuang mine. The 2 holes were of great depth and large diameter in soft-hard alternant stratum, construction was difficult with diameter shrinking and slant borehole. Small-diameter drilling and post-reaming were adopted with reasonable drilling tool assembly, drilling mud and effective deviation preventing measures, and the drainage hole construction was successfully completed.