| 顺煤层超长定向钻孔复合钻进摩阻规律研究 |
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| 引用本文： | 许超,姜磊,王鲜,方俊,陈盼,刘智.顺煤层超长定向钻孔复合钻进摩阻规律研究[J].煤田地质与勘探,2021,49(5):265-271. |
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| 作者姓名： | 许超 姜磊 王鲜 方俊 陈盼 刘智 |
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| 基金项目： | 国家科技重大专项课题2016ZX05045-003中国煤炭科工集团有限公司科技创新创业资金专项项目2018ZD004 |
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| 摘 要： | 煤矿井下超长孔定向钻进中孔内摩阻是限制其成孔率及成孔效率的主要因素, 为适应大盘区瓦斯抽采模式的客观需求, 研究实钻过程中摩阻及其影响规律。为顺煤层超长定向钻孔复合钻进减摩阻工艺参数选取提供依据, 对煤矿井下顺煤层近水平复合钻进工况下钻柱的钻具运动特性及受力状态进行分析。通过一定的条件假设, 建立复合钻进轴向摩擦阻力和旋转摩擦扭矩力学模型, 通过数值计算, 针对常用?89 mm定向钻具组合, 在不同孔深及钻进工艺参数匹配下的摩阻规律特性进行分析。结果表明:机械钻速、钻具转速、钻孔深度是滑动摩擦阻力和旋转摩擦扭矩的主控影响因素, 与超长定向钻孔实钻参数统计分析对比, 推进阻力和旋转扭矩变化规律与模型计算结果吻合, 该结果对于指导近水平钻孔复合定向钻进工艺参数选取、钻进工况判断具有重要的现实意义, 同时, 对于煤矿井下自动化、智能化定向钻进控制系统设计开发具有借鉴意义。
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| 关 键 词： | 近水平定向钻进 复合钻进 力学模型 滑动摩阻 摩擦扭矩 影响规律 |
| 收稿时间： | 2021-01-28 |
Friction law of compound drilling along the coal seam with super-long directional drilling |
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| Abstract: | The internal friction is the main factor affecting the drilling rate and drilling efficiency in super-long directional drilling in coal mines. In order to meet the objective demand of gas drainage mode in big panels, the friction and its influence law in drilling process are studied. To provide a basis for the selection of friction reduction process parameters of compound drilling along coal seam with super-long directional drilling, the drill string motion characteristics and stress state under the condition of near-horizontal compound drilling in the coal mine are analyzed. With certain conditional assumptions, the mechanical models of axial frictional resistance and rotational frictional torque of composite drilling are established. Under different hole depths and matching drilling process parameters, numerical calculations are carried out to analyze the friction law characteristics of the common ?89 mm directional assembly. The results reveal that the mechanical drilling speed, drilling rotation speed and drilling depth are the main controlling factors of sliding friction resistance and rotating friction torque. Compared with the statistical analysis of actual drilling parameters of super-long directional drilling, the changes of propulsion resistance and rotating torque are consistent with the calculation of the model. The result is of important practical significance for guiding the selection of technological parameters and drilling conditions of compound directional drilling near horizontal holes. Furthermore, it has referential significance for the design of automatic and intelligent directional drilling control system in underground coal mines. |
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