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NB/T 11635-2024: Measuring method for effective radius of gas emission drilling in coal seam
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Measuring method for effective radius of gas emission drilling in coal seam
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NB/T 11635-2024
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Basic data | Standard ID | NB/T 11635-2024 (NB/T11635-2024) | | Description (Translated English) | Measuring method for effective radius of gas emission drilling in coal seam | | Sector / Industry | Energy Industry Standard (Recommended) | | Classification of Chinese Standard | D09 | | Classification of International Standard | 13.100 | | Word Count Estimation | 14,158 | | Date of Issue | 2024-09-24 | | Date of Implementation | 2025-03-24 | | Issuing agency(ies) | National Energy Administration | NB/T 11635-2024: Measuring method for effective radius of gas emission drilling in coal seam---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Measuring method for effective radius of gas emission drilling in coal seam
Energy Industry Standards of the People's Republic of China
The National Energy Administration released
Effective emission radius of coal seam gas emission drilling hole
Determination method
Measuring method for effective radius of gas emission drilling in
coal seam
Published on 2024-09-24
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 General requirements 1
5 Preparation before measurement 2
6 Borehole Natural Gas Flow Method 2
7 Drill Cuttings Gas Desorption Index Method 4
Appendix A (Informative) Record of natural gas flow measurement in boreholes 6
Appendix B (Informative) Drill Cuttings Gas Desorption Index Determination Record Table 7
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., Huaneng Coal Technology Research Co., Ltd., China Coal Research Institute,
Shanxi Tiandiwangpo Coal Industry Co., Ltd., Xi'an University of Science and Technology.
The main drafters of this document are. Wu Jiaokun, Zhao Xusheng, Ding Hong, Zhang Qinghua, Chen Yong, Li Weidong, Shu Longyong, Sun Yongxin, Zhang Tianjun, Wang Yilong,
Yang Xu, Pan Hongyu, Sun Xiaohu, Zhou Mi, Huang Guangli.
Effective emission radius of coal seam gas emission drilling hole
Determination method
1 Scope
This document specifies the use of borehole natural gas flow method and drill cuttings gas desorption index method to determine the effective emission half-value of coal seam gas emission boreholes.
Preparation before diameter measurement, drilling arrangement, measurement process and determination principles, etc.
This document is applicable to the determination of the effective discharge radius of the borehole for gas emission along the protruding coal seam and the effective discharge radius of the borehole for gas emission through the layer.
The determination of the effective emission radius of non-protruding coal seam gas emission drilling holes can be used as a reference.
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
KA/T 1065 Determination method of gas desorption index of drill cuttings
MT/T 639 Method for determination of initial velocity of gas emission from boreholes
MT/T 854 Technical Specifications for Electronic Isovolumetric Gas Desorption Apparatus
MT/T 856 Technical Specifications for Pneumatic Drilling Gas Initial Velocity Measurement Device
MT/T 1173 Coal Seam Permeability Coefficient Determination Method-Radial Flow Method
3 Terms and definitions
The terms and definitions defined in GB/T 15663.8 and KA/T 1065 and the following apply to this document.
3.1
Effective emission radius of drilling
After a certain period of natural gas discharge in the coal seam around a borehole of a certain diameter, the gas in the coal seam is reduced to the edge of the range required by the specified index.
The distance from the center of the drill hole along the bedding direction of the coal seam.
3.2
Natural gas flow rate in drilling holes
The amount of gas that flows out of a borehole per unit time under natural conditions.
4 General requirements
4.1 The mine can select the appropriate effective discharge radius of the borehole according to the coal seam gas storage parameters, coal seam permeability, and the sensitivity of the measurement index.
When two methods are used for measurement at the same time, the smaller value of the effective discharge radius of the borehole determined by the two methods shall be taken as the effective discharge radius of the borehole.
Effective emission radius.
4.2 The measurement site should be selected in an area where the existing engineering is buried at a great depth, the coal wall is exposed for a short time, and there are no geological structures such as faults and folds.
4.3 If there is a blowout, top drilling or abnormal gas outflow during the drilling process, the measurement should be re-selected.
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