论文部分内容阅读
我队历来所勘探的对象系宁乡式水成赤铁矿床,通过几年来的中浅孔钻探工作证实,要求钻探向深部施工。为探明深部矿层埋藏情况,满足地质设计要求,钻孔孔深均在500～600米之间,且必须穿过130米厚的11级长兴灰岩和359米以下井深的阳新灰岩底部燧石层以及马安山层与含矿层的数十米的石英砂岩。因此,提高坚硬岩层中的钻进效率是我队今年实现千米钻迫不及待的工作。以往,由于我们对小井径钢砂钻进中技术操作(水量和压力掌握)不当,效率显得不如大孔径钢砂钻进高,钻进11级的长兴燧石层还普遍的采用φ110或φ91井径,这样,就很难适应简化钻孔孔径的需要,也是目前钻探技术上须得迅速解决的新问题。
My team has always been the object of exploration Ningxiang Shuicheng hematite deposit, through years of drilling confirmed in the shallow hole, requiring drilling to the deep construction. In order to find out the burial conditions of deep strata and meet the geological design requirements, the drilled hole depths are all between 500 and 600 meters, and must cross the 11-meter-long Changxing limestone of 130 meters and the bottom of Yangxin limestone below 359 meters of depth Layers and the mountainous and the seamount of dozens of meters of quartz sandstone. Therefore, improving the drilling efficiency in hard rock formations is a task that my team can not wait to achieve this year’s drill. In the past, because of our improper operation of the technology of small-diameter grit drilling (grasping of water amount and pressure), the efficiency was not as high as that of the large-grit grit drilling. The Changxing chert layer drilling at grade 11 also commonly adopted φ110 or φ91 caliber In this way, it is very difficult to adapt to the need of simplifying the borehole diameter, and it is also a new problem that must be promptly solved in the current drilling technology.