井下长距离定点保压密闭煤层瓦斯含量测定取样技术

发布时间：2018-06-28 01:48

本文选题：定向孔 + 取煤样　；参考：《煤炭科学技术》2017年07期

【摘要】：针对煤矿井下现有瓦斯含量测试技术存在的取样深度浅、精度低、瓦斯易逸散等不足,将定向钻进技术与密闭取心技术结合,开发了基于井下定向孔的煤样长距离定点保压密闭采心方法,即先利用定向钻孔长距离精确钻进至取样点,然后采用煤层密闭取样装置进行煤样保压密闭采取,主要包括取样定向孔设计、套管孔段和定向孔段施工、单点煤样采取和单孔多次取样等工艺步骤,选配了配套钻进与取样装备,并在焦作某矿进行了现场试验。结果表明,采用经改进的采样工艺方法和装备,成功完成5次煤样采取,煤样采取率100%,保压密闭成功率100%,最大取样深度达到491 m,是现有技术取样深度的6倍以上,实际取样点与设计位置偏差小于0.5%,显著提高了井下煤样采取精度,并减少了瓦斯逸散,确保煤层瓦斯参数测试的准确性,可为矿井工程设计与评估提供准确的参考依据。
[Abstract]:In view of the shortcomings of the existing gas content testing technology in coal mine, such as shallow sampling depth, low precision and easy to dissipate gas, the directional drilling technology is combined with the closed coring technology. Based on the downhole directional hole, the method of coal sample long distance fixed point pressure keeping and sealing core drilling is developed, that is, the directional drilling hole is used to drill accurately to the sampling point at long distance, and then the coal sample is kept under pressure and airtight by using the coal seam closed sampling device. It mainly includes sampling directional hole design, casing hole section and directional hole section construction, single spot coal sample taking and single hole multiple sampling process, matching drilling and sampling equipment, and field test in a certain mine in Jiaozuo. The results show that with the improved sampling process and equipment, 5 coal samples have been taken successfully, the sampling rate of coal sample is 100, the success rate of keeping pressure and sealing is 100, the maximum sampling depth is 491 m, which is more than 6 times of the sampling depth of the existing technology. The deviation between the actual sampling point and the design position is less than 0.5, which improves the precision of coal sample taking, reduces the gas emission, ensures the accuracy of the gas parameter test in coal seam, and provides an accurate reference basis for the design and evaluation of mine engineering.
【作者单位】：中煤科工集团西安研究院有限公司;西安科技大学建筑与土木工程学院;
【基金】：国家科技重大专项资助项目(2016ZX05045-003,2016ZX05067-001-003)
【分类号】：TD712.3

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