缓倾斜煤层高位定向长钻孔抽采卸压瓦斯技术研究

doi:10.16265/j.cnki.issn1003-3033.2024.S1.0024

中国安全科学学报 ›› 2024, Vol. 34 ›› Issue (S1): 102-108.doi: 10.16265/j.cnki.issn1003-3033.2024.S1.0024

缓倾斜煤层高位定向长钻孔抽采卸压瓦斯技术研究

双海清¹^,²^,³(), 刘子嘉¹, 林海飞¹^,²^,³, 周斌¹^,²^,³, 张文琦¹, 罗永刚⁴

¹ 西安科技大学安全科学与工程学院, 陕西西安 710054
² 西安科技大学西部矿井开采及灾害防治教育部重点实验室, 陕西西安 710054
³ 煤炭行业西部矿井瓦斯智能抽采工程研究中心, 陕西西安 710054
⁴ 陕西长武亭南煤业有限责任公司, 陕西咸阳 713600

收稿日期:2024-01-12 修回日期:2024-04-15 出版日期:2024-06-30
作者简介:
双海清 (1988—),男,陕西靖边人,博士,副教授,主要从事矿井瓦斯灾害防治、关停矿井开发利用等方面的研究。E-mail: shuanghaiqing@163.com。
林海飞,教授;
周斌,副教授。
基金资助:
国家自然科学青年项目(51904238); 陕西省自然科学青年基金资助(2019JQ-337); 陕西省自然科学青年基金资助(2022JQ-365); 陕西省教育厅专项科学研究计划(22JK0460)

Research on high directional and long drilling technology for extracting pressure relief gas in slowly inclined coal bed

SHUANG Haiqing¹^,²^,³(), LIU Zijia¹, LIN Haifei¹^,²^,³, ZHOU Bin¹^,²^,³, ZHANG Wenqi¹, LUO Yonggang⁴

¹ College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an Shaanxi 710054, China
² Key Laboratory of Western Mine Exploitation and Hazard Prevention, Ministry of Education, Xi'an University of Science and Technology, Xi'an Shaanxi 710054, China
³ Western Engineering Research Center of Mine Gas Intelligent Drainage for Coal Industry, Xi'an Shaanxi 710054, China
⁴ Shaanxi Changwu Tingnan Coal Co., Xianyang Shaanxi 713600, China

Received:2024-01-12 Revised:2024-04-15 Published:2024-06-30

摘要/Abstract

摘要：

为探究缓斜煤层覆岩采动裂隙时空演化及卸压瓦斯富集区的变化特征,采用物理相似模拟和现场监测方法,分析采动覆岩裂隙演化和裂隙分布特征;研究卸压瓦斯富集区演化特征,确定高位定向钻孔的合理布置参数方案,并进行效果检验。结果表明:试验工作面沿煤层走向垮落带高度13 m,裂隙带高度68.5 m,沿工作面倾向裂隙网络受煤层倾角影响,工作面断裂角为54°~59°,裂隙发育的开度自工作面向上逐渐增大,瓦斯运移通道呈现出明显的非对称性特征;高位定向钻孔全生命周期瓦斯抽采过程依据其抽采体积分数可分为抽采初期、抽采中期和抽采末期3个阶段,其中抽采初期抽采体积分数偏低,抽采中期为钻孔抽采生命周期内的高效抽采阶段,进入抽采末期抽采体积分数呈现急剧下降的趋势;高位定向长钻孔抽采技术实施后,工作面上隅角、回风巷瓦斯体积分数均小于0.8%,瓦斯抽采效果良好,高位钻孔的布置方式较为合理。

关键词: 缓倾斜煤层, 高位定向长钻孔, 瓦斯抽采, 卸压瓦斯, 采动裂隙

Abstract:

In order to investigate the spatio-temporal evolution of mining-induced fissures and change characteristics of pressure relief gas-enriched area in the overlying rock of the slowly inclined coal bed, physical similarity simulation and field monitoring method were used to analyze the evolution and distribution characteristics of the fissure in the overlying rock. The evolution characteristics of the pressure relief gas-enriched area were studied to determine the parameter arrangement scheme of the high directional drilling holes, and the effect test was carried out. The results show that the test working face has a height of 13 m along the caving zone of the coal bed, and the height of the fissure zone is 68.5 m. The fissure network along the working face is affected by the inclination angle of the coal bed, and the fracture angle of the working face is 54°-59°. The openness of the fissure development is gradually increasing upward from the working face, and the gas transportation channel is asymmetric. The whole life cycle of the gas extraction process by high directional drilling can be divided into the early stage of extraction, the middle stage of extraction, and the end stage of extraction according to the extraction volume fraction. In the early stage of extraction, the volume fraction is low. The middle stage of extraction has high efficiency in the whole life cycle of extraction. In the late stage of extraction, the volume fraction shows a sharp decline. After the implementation of the high directional and long drilling technology, the volume fractions of the gas in the upper corners of the working face and in the return-air tunnel are all less than 0.8%, indicating a good effect of the gas extraction, and the arrangement of the high drilling holes is reasonable.

Key words: slowly inclined coal bed, high directional and long drilling holes, gas extraction, pressure relief gas, mining-induced fissures

中图分类号:

X936

双海清, 刘子嘉, 林海飞, 周斌, 张文琦, 罗永刚. 缓倾斜煤层高位定向长钻孔抽采卸压瓦斯技术研究[J]. 中国安全科学学报, 2024, 34(S1): 102-108.

SHUANG Haiqing, LIU Zijia, LIN Haifei, ZHOU Bin, ZHANG Wenqi, LUO Yonggang. Research on high directional and long drilling technology for extracting pressure relief gas in slowly inclined coal bed[J]. China Safety Science Journal, 2024, 34(S1): 102-108.

图/表 11

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厚度/m	岩性	岩性描述
5.0	细砂岩	棕灰色,中部含少量方解石及菱铁矿,局部胶结有泥岩碎块
4.8	中粒砂岩	灰白色,中夹薄层砂质泥岩,含少重白云母及菱铁结核
1.4	细砂岩	惊黄色细砂岩,含自云母碎片
4.8	砂质泥岩	棕黄色及灰色砂质泥岩,下部0.9 m为浅灰色泥岩
1.9	砂质泥岩	黄灰色砂质泥岩中部含褐紫色菱铁矿结核
3.1	泥岩	浅灰色泥岩,含植物化石碎片,中部夹灰黄色砂质泥岩
1.9	砂质泥岩	深灰色、黑色砂质泥岩,含自云母碎片
2.1	细砂岩	灰黄色细砂岩,夹粉砂岩和白云母碎片
1.2	粗砂岩	灰色相砂岩,中部含少量泥质砂岩
1.8	粗砂岩	浅灰至灰白色粗砂岩,含白云母片
1.9	泥质砂岩	深灰色,下部为泥岩,局部夹薄层煤线
2.0	细砂岩	浅灰色细砂岩,中部含白云母
3.0	泥质砂岩	深灰色泥质砂岩
4.1	砂质泥岩	黑色砂质泥岩,平行层面含少里白云母碎片
3.5	己₁₅煤	黑色块状,光亮型煤

相似比	几何比 α_L	时间比 α_t	容重比 α_γ	应力比 α_σ	强度比 α_E
走向模型	100	10	1.5	150	150
倾向模型	200	14	1.5	300	300

钻孔编号	距顶板高度/m	距回风巷下帮/m	钻孔长度/ m	下筛管深度/m
1	18	25	522	489
2	21	30	525	510
3	24	35	525	327
4	27	38	522	457
5	30	43	513	501
6	36	48	501	501

缓倾斜煤层高位定向长钻孔抽采卸压瓦斯技术研究

Research on high directional and long drilling technology for extracting pressure relief gas in slowly inclined coal bed

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参考文献 15

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钻孔编号	距顶板高度/m	距回风巷下帮/m	钻孔长度/ m	下筛管深度/m
1	18	25	522	489
2	21	30	525	510
3	24	35	525	327
4	27	38	522	457
5	30	43	513	501
6	36	48	501	501

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钻孔编号	距顶板高度/m	距回风巷下帮/m	钻孔长度/ m	下筛管深度/m
1	18	25	522	489
2	21	30	525	510
3	24	35	525	327
4	27	38	522	457
5	30	43	513	501
6	36	48	501	501

钻孔编号	距顶板高度/m	距回风巷下帮/m	钻孔长度/ m	下筛管深度/m
1	18	25	522	489
2	21	30	525	510
3	24	35	525	327
4	27	38	522	457
5	30	43	513	501
6	36	48	501	501