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保径导向扩孔钻头的设计及其工程应用
引用本文:何玉云,王发民. 保径导向扩孔钻头的设计及其工程应用[J]. 探矿工程, 2019, 46(11): 50-53
作者姓名:何玉云  王发民
作者单位:宁夏回族自治区核工业地质勘查院,宁夏回族自治区核工业地质勘查院
基金项目:宁夏回族自治区第八批地勘基金项目“灵武幅、磁窑堡幅1∶5万综合地质调查项目”(编号:2017NCZ001803W)
摘    要:
岩心钻探中,在砾石(漂砾)等破碎地层采用常规三翼扩孔钻头扩孔时,常出现憋车和卡钻现象,且扩孔效率低。为此,设计了具有导向和保径功能的扩孔钻头。新设计的扩孔钻头在宁夏灵武一个综合地质孔进行了应用,扩孔效果良好,平均扩孔效率3.5 m/h,形成的新孔眼与原孔眼同轴度高,孔径规则,下套管顺利,对第四系破碎地层进行了有效分隔,保障了后续取心钻进和物探测井的顺利进行。

关 键 词:岩心钻探;破碎砾石层;钻头保径;导向扩孔;扩孔钻头
收稿时间:2018-12-28
修稿时间:2019-03-07

Design and field use of the gauge-protected pilot reaming bit
HE Yuyun and WANG Famin. Design and field use of the gauge-protected pilot reaming bit[J]. Exploration Engineering:Rock & Soil Drilling and Tunneling, 2019, 46(11): 50-53
Authors:HE Yuyun and WANG Famin
Affiliation:Ningxia Nuclear Industry Geological Exploration Institute,Ningxia Nuclear Industry Geological Exploration Institute
Abstract:
During core drilling, blockage and sticking often occurs when conventional three-wing reaming bits are used for reaming in broken strata such as gravel (boulder), which results in low reaming efficiency. For this purpose, a reaming bit with guiding and gauge protection functions was designed, and was applied in a comprehensive geological hole in Lingwu, Ningxia, with good reaming effect, and the average reaming footage up to 3.5m/h. The reamed hole was highly coaxial with the original hole, and had a regular gauge, leading to smooth casing running. The Quaternary broken formation was effectively separated to ensure smooth performance of subsequent core drilling and geophysical logging.
Keywords:core drilling   broken gravel bed   gauge-protected bit   guiding reaming   reaming bit
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