NB/T 11541-2024Technical specifications for regional outburst prevention of gas pre extraction in coal roadway strips through directional long boreholes along the coal seam (English PDF)
顺层定向长钻孔预抽煤巷条带煤层瓦斯区域防突技术规范
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Issued by
NEA
Level / Type
Industry · Recommended
Issue date
May 24, 2024
Implementation date
November 24, 2024
Scope
NB/T 11541-2024 is the English-translated version of 顺层定向长钻孔预抽煤巷条带煤层瓦斯区域防突技术规范.
NB/T 11541-2024 covers regional outburst prevention for coal roadway strips, in which seam gas is drained in advance through long directional boreholes drilled along the coal seam.
It deals with borehole design, drilling and gas extraction, testing of the effectiveness of the regional measures, and regional verification. Main boreholes and the branch boreholes that probe the roof and floor are defined, and the design must start from the known occurrence of the seam.
The text draws on GB 50471 and on NB/T 10173 and NB/T 11169. Issued on 24 May 2024, it has applied since 24 November 2024.
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Document preview — NB/T 11541-2024
National Standard of the People's Republic of China
- ICS
- 73.020
- Classification
- D 09
Issued by: National Energy Administration of the People's Republic of China
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Drilling Design
- 5 Drilling construction and gas extraction
- 6 Regional burst prevention measures effectiveness test
- 7 Regional Verification
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.
1 Scope
This document specifies the drilling design, drilling construction and gas prevention technology of the coal seam gas zone in the coal lane strip with directional long drilling along the seam.
Sampling, testing of effectiveness of regional prevention measures, and regional verification.
This document is applicable to regional coal seam outburst prevention technology work that uses long directional drilling along the seam to pre-extract coal seam gas from coal lanes and strips.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.
GB 50471 Design standard for coal mine gas extraction projects
GB/T 23250 Direct determination method of gas content in coal seams underground
GB/T 42638 Direct determination method of gas extraction radius in coal seams in underground coal mines - Extraction volume method
NB/T 10173 Technical specification for directional drilling in underground coal mines
NB/T 11169 Technical specification for long hole directional drilling for gas extraction in underground coal mines
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Long directional borehole along the coal seam
A long-distance borehole is formed by directly constructing in the coal seam and controlling the drilling axis to extend along the designed trajectory in the coal seam.
3.2 Main borehole
The drilling trajectory is a long directional drilling hole along the layer at the main design position.
3.3 Branch borehole
Branch drilling branchborehole A branch is constructed from a certain position of the main borehole to detect the roof and floor of the coal seam and control the long directional drilling section along the coal seam extraction area.
4 Drilling design
4.1 General requirements
The measures to prevent coal seam gas from bursting in coal seams by using long directional drilling holes along the seams to pre-extract coal lanes should meet but not be limited to the following requirements.
a) Drilling design should be carried out based on the known coal seam occurrence conditions;
b) Main drilling holes can be evenly distributed to cover the coal seams in the pre-extraction area of the coal roadway strip; when the main drilling holes cannot effectively control the coal seams, the main
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB 50471Coal Mine Gas Drainage Engineering Design Standard
- GB/T 23250The direct method of determining coalbed gas content in the mine
- GB/T 42638The direct measuring method of the coal seam gas drainage radius in coal mine - Method of drainage volume
- NB/T 10173Technical regulations of directional drilling in coal mine
- NB/T 11169Technical specifications for long borehole directional drilling for underground gas drainage in coal mines
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Related Standards
GB 50471-2018 — Coal Mine Gas Drainage Engineering Design Standard
GB/T 23250-2009 — The direct method of determining coalbed gas content in the mine
GB/T 42638-2023 — The direct measuring method of the coal seam gas drainage radius in coal mine - Method of drainage volume
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