| 小径偏斜技术应用实例 |
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| 引用本文： | 刘小康.小径偏斜技术应用实例[J].中国煤田地质,2005,17(5):117-118,121. |
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| 作者姓名： | 刘小康 |
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| 作者单位： | 陕西省煤田地质局一九四队,陕西铜川727000 |
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| 摘 要： | 黄陵矿区二号井田R49孔在井深392.63m处发生粘钻事故,部分钻具滞留孔底,为减少报废进尺,补取煤心,在后续工程施工中采用了小径偏斜技术.根据该孔特点及井深层位,制作了符合施工要求的偏心楔,并按照一定的操作程序下到指定位置.在偏斜钻进时选用硬质合金钻头.根据需要分段调整了转速、钻压、泵量等钻进参数.为避免偏心楔在孔内发生位移和转向,采取了一些防护措施和技术手段,保证了偏斜钻进既绕过事故钻具终孔,又补取了煤心,取得了较好的地质技术及经济效果.
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| 关 键 词： | 小径 偏斜 偏心楔 |
| 文章编号： | 1004-9177（2005）05-0117-02 |
| 收稿时间： | 2005-04-25 |
| 修稿时间： | 2005-04-25 |
Application Example of Deflecting Technique in Small-Hole Drilling |
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| Liu Xiaokang.Application Example of Deflecting Technique in Small-Hole Drilling[J].Coal Geology of China,2005,17(5):117-118,121. |
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| Authors: | Liu Xiaokang |
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| Institution: | No.194 Team, Shaanxi Bureau of Coal Geology, Tongehuan, Shaanxi 727000 |
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| Abstract: | A jam accident was happened at 392.63m of R No.49 borehole in No.2 minefield, Huangling mining area, a part of drilling tool was detained in borehole bottom. Make up coal coring for the discarded footage cut-down, we use the smallhole deflecting technique in subsequent operation. Based on the borehole characters, depth and passing position, made a defleeting wedge accord with operating requirements, and lowering it down to assigned position along the lines of stated sequence of operation. During the deflected drilling, carbide bit was selected. According to requirements, we adjusted the drilling recommendation of rotating speed, bit pressure, and pump volume sectionally. To avoid displacement and turning of the deflecting wedge, some preventive measures and technical means were adopted, ensuring the deflecting drilling bypassed the defect tools to the end of the drilling, made up coal coring and gotten better geological techno-economic effects. |
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| Keywords: | small-hole drilling deflecting technique deflecting wedge carbide bit drilling recommendation |
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