甘肃曹家口金矿松散破碎地层液动潜孔锤钻进冲洗液选型及应用

Selection and Application of Hydraulic DTH Hammer Flushing Fluid for Loose and Fractured Formation in Gansu

曹家口金矿位于甘肃省山丹县大马营乡。2015年宁夏核工业地质勘查院2台全液压动力头钻机在该矿区施工,因地层破碎、坍塌、漏失严重等情况,曾报废4个钻孔。为了提高施工效率和施工质量,采用SYZX96型绳索取心液动潜孔锤,为确保液动潜孔锤能发挥最佳使用效果,对配套冲洗液类型进行了评价研究,并进行了现场应用。应用结果表明,回次进尺平均提高68%,全孔岩心采取率达到95.5%以上,台月效率平均提高21%,没有发生孔内事故,降低了钻探成本,提高了施工质量和施工效率。

Caojiakou gold deposit is located in Shandan County of Gansu Province.In the drilling construction in 2015,2 full hydraulic power head drilling rigs were used,4 drilling holes have been scrapped because of formation fracture,collapse and serious leakage.In order to improve the construction efficiency and quality,SYZX96 type wire-line coring hydraulic DTH hammer was adopted,and the evaluation analysis was carried out on the types of matching flushing fluid to ensure the best effect of the hydraulic DTH hammer.The field application results show that the footage per round trip increased by 68%,the core recovery rate was up to more than 95.5%in total and the average monthly efficiency increased by 21% with no downhole accident,which reduces the drilling cost and improves the construction quality and construction efficiency.