| 煤矿井下碎软煤层顺层钻完孔技术研究进展 |
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| 引用本文： | 王力,姚宁平,姚亚峰,王毅,张杰,方俊,魏宏超.煤矿井下碎软煤层顺层钻完孔技术研究进展[J].煤田地质与勘探,2021,49(1):285-296. |
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| 作者姓名： | 王力 姚宁平 姚亚峰 王毅 张杰 方俊 魏宏超 |
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| 作者单位： | 煤炭科学研究总院;中煤科工集团西安研究院有限公司 |
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| 基金项目： | 国家科技重大专项任务(2016ZX05045-003-002);陕西省重点研发计划项目(2018GY-078);中煤科工集团西安研究院有限公司科技创新基金项目(2018XAYMS13)。 |
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| 摘 要： | 我国碎软煤层赋存层位多、分布广，普遍存在构造应力复杂、瓦斯压力高、煤体力学强度低、渗透性差等特点，钻进时易塌孔、喷孔、孔壁失稳，导致钻进困难、孔内事故频发、成孔深度浅、钻孔堵塞、存在抽采盲区等问题。随着煤炭开采深度的不断增加，碎软煤层瓦斯抽采钻完孔就更加困难。因此，碎软煤层高效、深孔、精准钻进技术以及增透、增产、护孔的完孔技术一直是碎软煤层瓦斯治理的重大技术需求和研究热点。从护孔、排渣、轨迹控制、完孔等成孔的关键技术难题方面，总结了碎软煤层顺层钻完孔技术研究现状和应用情况，分析了目前碎软煤层钻进技术存在的问题，提出了改进完善建议，分析了内控导向式旋转定向钻进技术，多孔介质充填式筛管、折叠膨胀管完孔技术等碎软煤层钻完孔技术新进展，为进一步完善现有碎软煤层钻完孔技术提供了思路。
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| 关 键 词： | 煤矿井下 碎软煤层 瓦斯抽采 内控导向式旋转定向钻进 筛管完孔 |
| 收稿时间： | 2021-01-09 |
Research progress of drilling and borehole completion technologies in broken soft coal seam in underground coal mine |
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| WANG Li,YAO Ningping,YAO Yafeng,WANG Yi,ZHANG Jie,FANG Jun,WEI Hongchao.Research progress of drilling and borehole completion technologies in broken soft coal seam in underground coal mine[J].Coal Geology & Exploration,2021,49(1):285-296. |
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| Authors: | WANG Li YAO Ningping YAO Yafeng WANG Yi ZHANG Jie FANG Jun WEI Hongchao |
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| Institution: | (China Coal Research Institute,Beijing 100013,China;Xi'an Research Institute Co.Ltd.,China Coal Technology and Engineering Group Corp.,Xi'an 710077,China) |
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| Abstract: | In China,broken soft coal seams are in many strata and widely distributed.It is generally characterized by complex tectonic stress,high gas pressure,low mechanical strength and poor permeability,therefor,the hole is easy to collapse,outburst,which will probably cause many problems such as drilling difficulties,frequent accidents in the hole,inadequate hole depth,borehole blockage,drainage blind area and so on.With the continuous increase of coal mining depth,it is more difficult for drilling and completion in broken soft coal seam.Therefore,the high efficiency,deep hole and precise drilling technology,as well as the completion technology,production increasing and borehole protection technologies have always been the major requirements and research hotspots of gas governance in broken soft coal seam.From the aspects of key technical problems,such as borehole protection,cutting remove,trajectory control,borehole completion,the research status,application of inseam drilling and completion technology in broken soft coal seam are summarized.The problems existing in drilling technologies of broken soft coal seam are analyzed,and the suggestions for improvement are proposed.New technology progress analysis on internal controlled and guided rotary directional drilling technology,screen pipe with porous medium filling and folded expansion tube completion technology are conducted,which provides ideas for new research direction and improvement of existing drilling and completion technologies of broken soft coal seam. |
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| Keywords: | underground coal mine soft coal seam gas extraction internal controlled and guided rotary directional drilling screen pipe completion |
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