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NB/T 11638-2024: Method for determining the extraction volume of single-layer gas in multi-coal seam by drilling through - Seam holes: measured flow rate method
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Method for determining the extraction volume of single-layer gas in multi-coal seam by drilling through - Seam holes: measured flow rate method
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NB/T 11638-2024
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Basic data | Standard ID | NB/T 11638-2024 (NB/T11638-2024) | | Description (Translated English) | Method for determining the extraction volume of single-layer gas in multi-coal seam by drilling through - Seam holes: measured flow rate method | | Sector / Industry | Energy Industry Standard (Recommended) | | Classification of Chinese Standard | D09 | | Classification of International Standard | 13.100 | | Word Count Estimation | 13,159 | | Date of Issue | 2024-09-24 | | Date of Implementation | 2025-03-24 | | Issuing agency(ies) | National Energy Administration | NB/T 11638-2024: Method for determining the extraction volume of single-layer gas in multi-coal seam by drilling through - Seam holes: measured flow rate method
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Method for determining the extraction volume of single-layer gas in multi-coal seam by drilling through - Seam holes. measured flow rate method
Energy Industry Standards of the People's Republic of China
The National Energy Administration released
Gas extraction volume of a single layer in multi-coal seam by pre-extraction through through-layer drilling
Determination method. measured flow method
Method for determining the extraction volume of single⁃layer gas
in multi⁃coal seam by drilling through-Seam holes. measured
flow rate method
Released on September 24, 2024
2025-03-24 Implementation
CCS D 09
ICS 13.100
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Method Principle 1
5 General Requirements 1
6 Preparation before measurement 1
7 Measurement process 2
8 Calculation of measurement results 4
9 Determination of single layer extraction volume during combined pre-extraction 5
Appendix A (Informative) Record Sheet for Determining Drilling Construction Parameters 6
Appendix B (Informative) Gas Drainage Parameter Measurement Record Sheet 7
Appendix C (Informative) Extraction Volume Ratio Calculation Results Record Table 8
Table of Contents
Preface
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.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Coal Industry Association.
This document is under the jurisdiction of the Coal Industry Coal Mine Safety Standardization Technical Committee.
This document was drafted by. China Coal Technology and Engineering Group Chongqing Research Institute Co., Ltd., Heilongjiang Longmei Jixi Mining Co., Ltd., Chongqing University,
Hunan Gas Control and Utilization Engineering Research Center Co., Ltd., Xi'an University of Science and Technology.
The main drafters of this document are. Zhao Xusheng, Ding Hong, Wang Zhen, Wu Jiaokun, Chen Yong, Liu Xianjun, Ge Zhaolong, Ma Hongyu, Zhang Tianjun, Liu Zhiwei, Cao Jiahua,
Pan Hongyu, Ji Daorong, Lian Changjun, Zhang Zhonghai, Jia Xiaoliang, Deng Zhaoyu, Huang Guangli, Zhou Mi, and Zhang Mingming.
Gas extraction volume of a single layer in multi-coal seam by pre-extraction through through-layer drilling
Determination method. measured flow method
1 Scope
This document specifies the principle, general requirements, and
Preparation before measurement, measurement process and calculation of measurement results.
This document is applicable to the investigation and determination of the proportion of single-layer extraction volume when through-layer drilling is used to pre-extract gas from multiple coal seams in underground coal mines.
2 Normative references
The contents of the following documents constitute the 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.
document.
GB/T 15663.8 Coal Mine Scientific and Technological Terminology Part 8.Coal Mine Safety
MT/T 642 Technical Specifications for Instruments for Measuring Comprehensive Parameters of Gas Drainage in Pipelines
3 Terms and Definitions
The terms and definitions defined in GB/T 15663.8 and the following apply to this document.
3.1
target coal seam
When conducting through-layer drilling combined with pre-extraction of multiple coal seam gas, it is necessary to determine the extraction volume of each coal seam.
4 Principles of the Method
In the investigation area where coal seams and gas occurrence conditions are relatively stable, drilling holes are constructed in the target coal seams and multiple coal seams respectively.
Under the condition that the sealing process and extraction negative pressure and other parameters are basically the same, the extraction volume of the target coal seam alone and the extraction volume of multiple coal seams are measured respectively.
Calculate the ratio of individual extraction volume to combined extraction volume. Determine the combined pre-extraction volume of multiple coal seams in areas with similar coal seam and gas occurrence conditions.
The basis for calculating the extraction volume of a single target coal seam.
5 General requirements
5.1 The measurement site should be selected in an area where gas extraction has not been carried out, and the coal seams and gas occurrence conditions in the selected area should be representative.
5.2 For adjacent coal seams with an average normal distance of less than 5 m from the target coal seam, the mine may inspect them together with the target coal seam based on actual needs.
5.3 The gas extraction flow rate should be measured manually on site.
6 Preparation before measurement
6.1 Instruments used to measure gas extraction flow should be within the validity period of calibration and meet the following requirements.
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