| 涌水坑道钻孔岩心上升系数ξ定义及其实践意义 |
| 投稿时间：2018-09-25 修订日期：2019-05-14 点此下载全文 |
| 引用本文：郝海洋.涌水坑道钻孔岩心上升系数ξ定义及其实践意义[J].钻探工程,2019,46(6):26-30.HAO Haiyang. Definition of core-uplift-coefficient ξ in large water kick core holes and its field application[J]. Drilling Engineering, 2019,46(6):26-30. |
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| 基金项目:贵州省地矿局地质科学研究项目“贵州省煤层气井套管-地层一体化胶结防水窜技术研究”（编号：黔地矿科合\[2018\]26） |
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| 中文摘要:坑道钻孔内涌水给常规小口径取心钻探带来了极大的施工难题。水银洞金矿Ia矿体地下水丰富，坑道钻探施工中，发现孔底岩心可以从孔口冲出。由此提出了坑道涌水钻孔岩心上升系数ξ，其物理意义是岩心在孔底水压和浮力的作用下，克服重力以及与钻杆内壁摩擦力而自动上升的能力，并结合钻孔实际参数，讨论了ξ的实践意义。当ξ≥1时，理论上孔底岩心可以随孔内涌出水从孔内冲出；当ξ＜1时，孔底岩心则不能被冲出，只能依靠起大钻取出。通过计算矿层的岩心上升系数，结合实际地层的完整性情况，可以帮助钻探人员控制合适的进尺后割心，使ξ≥1，从而让钻孔内岩心自动从孔底排出。岩心上升系数，可以为提高地表和坑道高压涌水钻孔钻进效率提供理论指导，具有一定的实践意义。 |
| 中文关键词:坑道钻探 涌水孔 岩心上升系数ξ |
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| Definition of core-uplift-coefficient ξ in large water kick core holes and its field application |
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| Abstract:The outrush water in tunnel bore hole brings great drilling operation problem to conventional small diameter coring operations. It was found that the core could get out of the hole with the high water pressure inside the hole combined with the drilling operation of the tunnel hole to explore Ia ore body of Shuiyindong Gold Mine. Thus, the core-uplift-coefficient ξ was put forward; its physical meaning is that under the action of water pressure and buoyancy at the bottom of the hole, the core overcomes its gravity and the friction force to automatically rise. And its practical significance was discussed in combination with the practical parameters of bore holes. When ξ is greater than or equal to 1, theoretically the cores at the bottom of the hole can rush out of the hole with the gushing water. When ξ is smaller than 1, the cores cannot rush out of the hole and drillers should pull out the drilling strings to obtain the cores. By calculating the ξ of the ore layer and combining with the integrity of the actual stratum, it helps the drillers to control the proper drill footage to make sure the ξ≥1. So the core in the drill hole can be automatically lift up from the bottom of the hole. The core-uplift-coefficient ξ not only can provide theoretical guidance for the high pressure water hole in the surface or tunnel drilling holes, but also has certain practical significance. |
| keywords:Tunnel drilling Large water gushing hole Core-uplift-coefficient ξ |
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