Impacts of diamond particle sizes on performance of Ni-Cu superhydrophobic coatings on drilling tool surfaces [PDF]
ObjectiveApplying superhydrophobic coatings on drilling tool surfaces can effectively alleviate the challenges posed by drill bit balling and core barrel blockage.
Bingsuo PAN +3 more
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Characteristics of argillization and adhesion and influencing factors of drilling cuttings in borehole of roadway in soft argillaceous surrounding rock [PDF]
Borehole drilling is an essential step for the anchoring control of roadway surrounding rock of coal mines. The efficiency of bolt installation and bonding effect between resin-rock interface are closely related to the quality of borehole formation. When
Bingao YAO +6 more
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Identification method of roof rock interface based on response characteristics of drilling parameters [PDF]
This paper investigates measurement while drilling for rock strata interface to achieve geological transparency, promote intelligence development, and address the limitations of traditional rock detection methods in coal mines, including slow speed, high
KANG Zhipeng +5 more
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Critical technologies and geology-engineering integration practices for deep CBM production in the Yanchuannan CBM field [PDF]
Objective and Methods This study introduces the adjustments for coalbed methane (CBM) production in the Yanchuannan CBM field‒the first deep CBM field in China.
Bin CUI +6 more
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Cutting attitude inclination angle and rock-breaking mode characteristics of disc cutter [PDF]
The identification of rock-breaking mode is a key basis to improve cutting ability, and the cutter cutting attitude has a significant influence on rock-breaking mode.
Chunsheng LIU +5 more
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Research on the gas-liquid-solid coupled slag discharge flow field and optimization of cutterhead slag suction port in shaft drilling [PDF]
Aiming at the problems of gas lift reverse circulation shaft washing slag discharge and low drilling efficiency in the application of vertical shaft drilling method in the Jurassic strata coal mines in western China, taking ϕ4.2 m advanced drilling of ...
Chuanxin RONG +4 more
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Method and key technologies of underground and surface combined stepwise progressive anti-outburst for deep coal seam groups [PDF]
Modern high-yield and high-efficiency mines still face the situation of tight replacement among roadway driving, mining and extraction, and put forward higher requirements for the regional scope and advanced time of outburst prevention and control ...
Junjian XU, Siqian LI, Yongjiang ZHANG
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Key technology and equipment for fully mechanized mining with extra-large shearing height of 10 m in extra-thick coal seam [PDF]
Fully mechanized mining technology with extra-large shearing height is the optimal technical approach to achieve high-yield, high-efficiency and high-recovery mining for 6−10 m ultra-thick coal seam in Chinese coal mines.
Cundi HAN +17 more
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, 2019 为解决西南地区薄煤层长距离瓦斯抽采孔成孔难的问题,选取西南地区具有代表性的某矿进行了本煤层瓦斯抽放孔试验。试验采用循环水为冲洗介质的正循环回转钻进工艺,设备选用中煤科工集团西安研究院研制生产的ZDY4000S钻机、配套Φ73mm×1.5m摩擦焊接式外平钻杆及Φ94mm三翼内凹式PDC钻头。解决了该矿在施工长距离瓦斯抽放孔的技术难题,希望为适合此类煤矿瓦斯抽采钻孔及地质勘探提供了宝贵经验,并得以广泛推广。
乃强 姬
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Shiyou jixie, 2014 PDC钻头在泥页岩中钻进时容易出现泥包现象，岩屑粘附于切削齿和刀翼顶面，使切削齿无法有效吃入地层。为此，研究了钻头冠部轮廓、切削结构、刀翼形状和水力结构等对PDC钻头防泥包性能的影响，并设计了新型防泥包PDC钻头。通过对PDC钻头体三维造型进行特殊设计，可以有效解决水眼堵塞、钻头泥包的难题，钢体PDC钻头以其无可比拟的优点应用会越来越广泛。滨深24X1井的现场试验结果表明，新型防泥包PDC钻头具有显著的防泥包性能，机械钻速高，在大港油田泥岩作业中有很高的推广应用价值。
徐建飞
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