煤层底板孔多分支点取样钻进技术及应用研究

褚志伟; 龙威成; 贾秉义; 刘飞

doi:10.12363/issn.1001-1986.21.10.0586

煤层底板孔多分支点取样钻进技术及应用研究

doi: 10.12363/issn.1001-1986.21.10.0586

基金项目: 天地科技股份有限公司科技创新创业资金专项项目(2018-TD-ZD016)

详细信息

第一作者:
褚志伟，1989年生，男，河北廊坊人，硕士，助理研究员，从事井下钻探工艺技术研究. E-mail：chuzhiwei@cctegxian.com

中图分类号: TD421
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- 被引次数: 0
出版历程
- 收稿日期: 2021-10-25
- 修回日期: 2021-12-20
- 发布日期: 2022-05-25
- 网络出版日期: 2022-05-06

Study and application on multi branch point sampling drilling technology of coal seam floor borehole

摘要

摘要: 针对碎软煤层长距离瓦斯参数测定、瓦斯抽采钻孔工程设计指导和抽采效果评价的技术需求，在分析现有碎软煤层取样钻进技术存在问题的基础上，提出了煤层底板孔多分支点取样钻进方法，制定了取样钻进工艺流程，开发了随钻轨迹精准调控、“机械+水力”高效排渣等关键钻进技术，选型配套了定点取样钻孔钻进装备和密闭取样装备。在安徽省宿州市某矿开展了现场试验，施工了1个主孔深度301 m的取样定向钻孔，在取样分支孔中实施了2次定点密闭取样，取样深度分别为178、238 m，顺利在碎软煤层中采取了煤样，获取煤样的瓦斯含量分别为9.05 m³/t和10.08 m³/t，与常规方法相比测得瓦斯含量分别提高了12.4%和25.2%，确保了煤层瓦斯参数测试的准确性，可为碎软煤层瓦斯参数测定提供一种新的技术途径。
- 钻进技术 /
- 底板钻孔 /
- 多分支取样 /
- 密闭煤心 /
- 定向钻探
Abstract: According to the technical requirements of long-distance gas parameter measurement, gas extraction borehole design guidance, and extraction evaluation for broken soft coal seam, the multi branch point sampling drilling method of coal seam floor borehole was proposedand its sampling drilling process was formulated on the basis of analyzing existing problems of sampling and drilling technology. Furthermore, the key drilling technologies such as accurate drilling trajectory control and “mechanical + hydraulic” efficient slag removal were developed. The equipment of drilling and sealed sampling were introduced. The application test was carried out in a coal mine in Suzhou, Anhui Province, in which the sampling borehole with a depth of 301 m was constructed, and spot sealed sampling drilling were carried out for two times, with the depths of 178 m and 238 m, respectively. The coal samples were successfully taken. The gas content of the obtained coal samples were 9.05 m³/t and 10.08 m³/t respectively. Compared with the conventional method, the measured gas content was increased by 12.4% and 25.2%, respectively. The technology can ensure the accuracy of coal seam gas parameter testing, providing a new technical way for broken soft coal seam sampling.
- drilling technology /
- floor borehole /
- multi branch sampling /
- closed coal core /
- directional drilling

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图 1 多分支密闭取样钻进工艺流程

Fig. 1 Flow chart of the multi branch sampling drilling

下载: 全尺寸图片幻灯片

图 2 煤层起伏随钻探查原理

Fig. 2 Schematic diagram of the exploration principle under coal seam undulating

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图 3 “机械+水力”高效排渣原理

Fig. 3 Principle diagram of the efficient slag discharge by “mechanical + hydraulic”

下载: 全尺寸图片幻灯片

图 4 取样钻杆实物

Fig. 4 The sampling drill pipe

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图 5 取样钻孔设计轨迹剖面

Fig. 5 Design track profile of the sampling bore hole

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图 6 取样钻孔实钻轨迹剖面

Fig. 6 Drilling profile of the sampling bore hole

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图 7 获取煤样实物

Fig. 7 Coal samples taken from boreholes

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表 1 关键配套钻进装备基本情况

Table 1 Basic information of key supporting drilling equipment

装备名称	主要用途	技术要求
定向钻机	提供定向钻进、取样钻进动力	结构紧凑、主轴通径大
泥浆泵(车)	提供高压冲洗液	泵压≥8 MPa、泵量可调节
螺杆钻具	提供碎岩动力、轨迹调整	外螺旋结构
测量系统	钻孔轨迹测量	性能稳定、传输速度快
定向钻杆	传递转矩、输送冲洗液、传输信号	强度高、外螺旋结构
钻头	套管孔段、定向孔段碎岩钻进	级配合理、寿命长

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