地浸砂岩型铀矿钻探现状及提高钻探效率的技术措施

Current status of in-situ leachable sandstone-type uranium drilling and technical measures of improving drilling efficiency

摘要:

近十年来，随着我国地浸砂岩型铀矿钻探工作量稳步增加，以及铀矿新层位、新地区、新类型、新深度找矿思路调整，对地浸砂岩型铀矿钻探工艺及装备提出了新的要求。在分析目前地浸砂岩铀矿钻探施工现状基础上，从工艺技术与装备等方面提出了一系列提高钻探效率的改进措施。主要包括实行地表退心平行作业、采用低固相聚合物泥浆、优化钻头钻具组合、松散地层应用单动双管和大口径绳索取心钻进技术、开展无岩心钻进技术、开发自动化数字化的砂岩铀矿钻探设备，以大力提升行业钻探水平。

Abstract:

Over recent ten years， the drilling footage in in-situ leachable sandstone-type uranium exploration in China has been increasing steadily， and uranium exploration is shifting to new stratums， new areas， new types and new depth； thus， new requirements are raised for in-situ leachable sandstone-type uranium drilling technology and equipment. This paper analyzes the current status of in-situ leachable sandstone uranium drilling， and proposes a series of improvement measures to improve drilling efficiency from the aspects of technology and equipment. The main measures include implementation of parallel operation of core removal at surface and core drilling， utilization of low-solid polymer mud， optimization of the bit and drilling tool assembly， application of the swivel type double-tube core barrel and large diameter wire-line core drilling technology in loose strata， execution of full-face drilling technology. Besides， automatic and digital drilling equipment should be developed to promote the industrial level of drilling engineering.