| 狮子洋主航道特大水垂比大位移科学钻孔施工实践 |
| 投稿时间：2021-09-21 修订日期：2021-12-10 点此下载全文 |
| 引用本文：王汇明,李军,李勇,等.狮子洋主航道特大水垂比大位移科学钻孔施工实践[J].钻探工程,2022,49(1):135-141.WANG Huiming,LI Jun,LI Yong,et al. Novel drilling technology for an extended reach horizonal borehole with high horizonal displacement/vertical depth ratio in the Shiziyang main channel[J]. Drilling Engineering, 2022,49(1):135-141. |
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| 基金项目:中国地质调查局地质调查项目“银额盆地西部-北山盆地群油气地质调查”（编号：DD20190093）；珠江三角洲水资源配置工程（编号：发改农经［2018］1105号） |
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| 中文摘要:粤港澳大湾区狮子洋主航道地质勘察无法采用垂直点状钻探勘察施工，为此采用水平孔勘察方案，设计了一个特大水垂比大位移科学钻孔。该孔设计孔深940 m，取心靶点14个，靶区半径5.0 m，水平段长380 m，垂深60 m，水垂比14，是国内单孔作业靶点最多、水垂比最大的钻孔之一。研究制定了一套多靶点定向钻进、水平螺杆马达原状性取心、地质录井和存储式钻杆输送测井的综合勘察技术，在水利水电勘察中首次应用，取得了良好的效果。该孔完钻孔深936.20 m，中靶率85.71%，其中，取心进尺81.70 m，机械钻速2.38 m/h，岩心采取率89.84%，精准实现了洋底主航道的地质超前预报，大幅度减少了勘察孔数量，降低了环境破坏，提高了勘察效率，保证了地质资料的连续性和可靠性，是一项值得在隧道勘察中推广使用的先进技术。 |
| 中文关键词:水电勘察 定向钻进 特大水垂比钻孔 大位移钻孔 水平孔取心 存储式测井 综合勘察技术 |
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| Novel drilling technology for an extended reach horizonal borehole with high horizonal displacement/vertical depth ratio in the Shiziyang main channel |
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| Abstract:Geo-technical investigation of the Shiziyang main channel in the Guangdong-HongKong-Macao Greater Bay Area cannot be carried out with vertical point drilling. Therefore， an extended-reach novel horizontal borehole with high horizontal displacement/vertical depth ratio was designed for investigation： designed hole depth of 940m， 14 coring targets， target radius of 5.0m， horizontal section length of 380m， vertical depth of 60m， and horizontal displacement/vertical depth ratio of 14. It is one of the boreholes with the most working targets per single hole and the highest horizontal displacement/vertical ratio in China. A set of comprehensive exploration technologies， including multi-target directional drilling， undisturbed coring by the mud motor， geological logging and drill string-conveyed storage logging have been developed， and applied for the first time in water conservancy and hydropower investigation with good results. The completed drilling depth of the hole was 932.20m， and the target hit rate was 85.71% with the coring footage of 81.71m， the penetration rate 2.38m/h， and the core recovery rate 89.84%. With the novel drilling technologies， accurate advance geological prediction of the main channel on the ocean floor was achieved with great reduction of the number of exploration holes， less environmental damage， higher exploration efficiency； and the continuity and reliability of geological data was ensured. It is an advanced technology worth popularizing in tunnel exploration. |
| keywords:hydropower exploration directional drilling extra-large horizontal displacement/vertical depth ratio drilling extended reach drilling horizontal coring storage type logging comprehensive investigation technology |
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