松软煤层顺层孔筛管护孔工艺及装备应用

发布时间：2018-04-01 00:33

本文选题：松软煤层　切入点：筛管护孔　出处：《煤炭科学技术》2017年06期

【摘要】：针对寺家庄矿瓦斯抽采钻孔成孔深度浅、护孔效果差的问题,基于空气螺旋钻进工艺和筛管护孔工艺原理,完成了地层适用设备选型、钻具结构及施工工艺优化,并进行了现场试验。试验结果表明:使用该套设备施工,钻孔平均深度145 m,成孔深度较之前提高了30%,最大孔深180 m。试验护孔筛管下入率83.7%,孔底固定用悬挂装置轴向拖拽距离2~3 m,135 d后筛管有效护孔率达89%,筛管护孔工艺保障了筛管下入深度和护孔效果。加强型三翼可开闭式钻头平均穿岩51 m,钻头结构稳定,有效提高钻孔穿岩深度;相同孔深钻孔有效煤孔段(即煤岩比)与瓦斯抽采效果无相关性,钻孔深度及筛管有效护孔率是影响瓦斯抽采的主要因素。
[Abstract]:Aiming at the problems of shallow hole formation depth and poor hole protection effect of gas drainage borehole in Sijiazhuang Mine, based on the principle of air spiral drilling and sieve pipe protecting hole technology, the selection of suitable formation equipment, the optimization of drilling tool structure and construction technology are completed.The field test was carried out.The experimental results show that the average depth of borehole is 145 m, the depth of hole formation is 30 m higher and the maximum depth of hole is 180 m.The penetration rate of the sieve tube was 83.7, and the axial drag distance of the suspension device for fixing the bottom of the hole was 2 ~ 3 m ~ (135) d. The effective hole protecting rate of the sieve pipe was 89%. The technology of the sieve pipe protecting hole ensured the depth of the hole under the sieve pipe and the effect of the hole protection.The reinforced three-wing open closed bit has an average penetration of 51 m, the structure of the bit is stable, and the drilling depth is effectively increased, while the effective coal hole section (i.e. the ratio of coal to rock) of the same hole depth has no correlation with the gas extraction effect.The drilling depth and the effective hole-protecting rate of sieve pipe are the main factors affecting gas drainage.
【作者单位】：阳泉煤业(集团)有限责任公司;中煤科工集团西安研究院有限公司;
【分类号】：TD712.6

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