煤矿井下深孔密闭保压取样装置研制

郭明功; 张鹏伟; 于红

doi:10.13272/j.issn.1671-251x.2023010032

煤矿井下深孔密闭保压取样装置研制

doi: 10.13272/j.issn.1671-251x.2023010032

1.
平顶山天安煤业股份有限公司八矿，河南平顶山　467000
2.
郑州慧矿智能科技有限公司，河南郑州　450016
3.
永城煤电控股集团有限公司，河南永城　476600

基金项目: 国家自然科学青年基金资助项目（51804098）；河南工程学院博士基金资助项目（Dkj2018020）。

详细信息

作者简介:
郭明功（1980—），男，河南方城人，高级工程师，现从事矿井瓦斯灾害防治领域的管理工作，E-mail：gmg666@163.com

中图分类号: TD712
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出版历程
- 收稿日期: 2023-01-11
- 修回日期: 2023-10-19
- 网络出版日期: 2023-10-24

Development of sealed pressure maintaining sampling device for deep holes in coal mines

1.
No.8 Coal Mine of Pingdingshan Tian'an Coal Mining Co., Ltd., Pingdingshan 467000, China
2.
Zhengzhou Huikuang Intelligent Technology Co., Ltd., Zhengzhou 450016, China
3.
Yongcheng Coal Power Holding Group Co., Ltd., Yongcheng 476600, China

摘要

摘要: 采用敞口式岩心管取样来测定深孔煤层瓦斯含量时煤样暴露时间长、煤样易被污染、瓦斯损失量难以计量导致测量误差大，而现有密闭保压取样大多需要二次扩孔、结构复杂、取样成功率低造成难以大规模推广应用。针对上述问题，研制了一种煤矿井下深孔密闭保压取样装置。该装置采用“两级活塞+双层套管+煤样筒”的整体结构设计，通过控制井下高压水泵注入装置内的注水流量及注水时间，实现球阀由取样前密闭到取样时开启，再到取样后密闭的动作转换，达到煤样被密闭在煤样筒内的目的，防止煤样被污染及取样过程中瓦斯逸散。采用敞口式岩心管常规取样方法和深孔密闭保压取样装置分别采集了4组同钻孔同深度处煤样，进行瓦斯含量测定对比分析，现场试验结果表明：深孔密闭保压取样装置的取样深度接近350 m；相较于常规取样方法，深孔密闭保压取样测得的瓦斯含量偏大5.4%～37%，且随着取样钻孔深度增加，偏大的程度增加，表明密闭保压取样装置能够提高深孔煤层瓦斯含量测试的准确性。
- 定向长钻孔取样 /
- 煤层瓦斯含量 /
- 取煤样 /
- 深孔取样 /
- 保压取样 /
- 密闭取样
Abstract: When using open core tube sampling to measure the gas content in deep hole coal seams, the coal sample has a long exposure time. It is prone to pollution, and the gas loss is difficult to measure, resulting in large measurement errors. However, most of the existing sealed pressure maintaining sampling requires secondary expansion and complex structure. The sampling success rate is low, making it difficult to promote and apply on a large scale. In order to solve the above problems, a sealed pressure maintaining sampling device for deep holes in coal mines has been developed. The device adopts an overall structural design of "two-stage piston+double-layer casing+coal sample cylinder". By controlling the injection flow rate and injection time of the underground high-pressure water pump into the device, the ball valve switches from being sealed before sampling to being opened during sampling, and then to being sealed after sampling. The goal of sealing the coal sample in the coal sample cylinder is achieved, preventing contamination of the coal sample and gas escape during the sampling process. Four sets of coal samples from the same borehole and depth are collected using the conventional sampling method of an open core tube and a deep hole sealed pressure maintaining sampling device for comparative analysis of gas content. The on-site test results show that the sampling depth of the deep hole sealed pressure maintaining sampling device is close to 350 meters. Compared to conventional sampling methods, the gas content measured by deep hole sealed pressure maintaining sampling is 5.4% to 37%. The degree of deviation increases with the increase of sampling drilling depth. It indicates that the sealed pressure maintaining sampling device can improve the accuracy of deep hole coal seam gas content testing.
- directional long borehole sampling /
- coal seam gas content /
- coal sampling /
- deep hole sampling /
- pressure maintaining sampling /
- sealed sampling

HTML全文

图 1 深孔密闭保压取样装置结构

1—钻杆接头；2—外套管；3—芯轴；4—外活塞；5—内活塞；6—推进套管；7—推进齿条管；8—煤样筒底座；9—封口钢球；10—弹簧；11—压紧螺钉；12—煤样筒；13—推进齿条；14—齿轮；15—球阀阀芯；16—钻头；17—第一流通孔；18—第一流通孔右侧开口；19—第二流通孔左侧开口；20—第二流通孔。

Figure 1. Structure of deep borehole sealed pressure maintaining sampling device

下载: 全尺寸图片幻灯片

表 1 深孔密闭保压取样装置关键部件参数

Table 1. Parameters of key components of deep borehole sealed pressure maintaining sampling device

部件	尺寸
取样装置长度/mm	1 200
外套管/mm	ϕ73×1 106
推进套管/mm	ϕ60×438
推进齿条管/mm	ϕ60×581
煤样筒/mm	ϕ50×830
第二流通孔/mm	ϕ2×24
球阀通孔直径/mm	26

下载: 导出CSV

表 2 密闭保压取样与常规取样下煤层瓦斯含量测试结果对比

Table 2. Comparison of test results of gas content in coal seam under sealed pressure maintaining sampling and conventional sampling

孔号	取样方式	取样深度/m	煤样质量/g	瓦斯含量/（m³·t⁻¹）
1号	常规取样	126	1 128	5.3
1号	密闭保压取样	126	856	5.6
2号	常规取样	196	753	2.6
2号	密闭保压取样	196	553	3.1
3号	常规取样	273	1 038	4.2
3号	密闭保压取样	273	637	4.9
4号	常规取样	342	815	2.9
4号	密闭保压取样	342	694	4.6

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