夜长坪矿区钻探施工技术探讨

Discussion on Drilling Technology of Yechangping Mining Area

摘要:

夜长坪矿区施工初期，施工单位按自己以往的成功经验及钻探施工技术进行钻探施工作业，但由于该矿区与其他矿区的地层差异较大，很快就暴露出许多问题，上部出现掉块，卡钻严重时无法处理造成钻孔报废，都不同程度地成为事故孔，尤其是风化岩层亲水性强的地段，孔壁易坍塌，泵压高对地层产生劈裂破坏，地层被压漏，易造成埋钻事故。有5个钻孔因事故无法处理而报废，造成了巨大的经济损失，严重地影响了勘查进度。我单位在对钻探施工技术进行改进后，钻孔成孔率有了显著提高。由原来的无法成孔报废5孔到后期的46个孔全部成孔，且都为优良孔，最深钻探深度达到1501.54 m，台效提高明显，从原来的130 m增加到252 m，施工工期大大缩短，取得了较好的经济效益。从钻进方法、冲洗液性能、钻孔结构等几个方面进行了分析，简述了施工中出现的问题、原因及应对措施，总结了该矿工区施工经验和体会。

Abstract:

The formation conditions are quite different in Yechangping mining area; a lot of problems have been exposed in the initial construction by applying the previous successful experience and drilling technologies: the upper block falling and serious sticking cause borehole abandonments; especially in weathered rock sections with strong hydrophily, hole wall collapse, splitting failure on formation by high pump pressure and the formation being damaged by pressure lead drill bit burying. 5 abandoned boreholes cause huge economic loss and seriously affect exploration progress. After the improvement of drilling operation, the drilling hole rate has been significantly raised, 46 holes are completed, and all being fine holes, the deepest drilling depth reaches 1501.54m and efficiency per rig is improved obviously from 130m to 252m. In this paper, analysis is made on drilling method, flushing fluid property and borehole structure, some problems in construction and corresponding causes as well as countermeasures are introduced and construction experience is summarized.