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KA 29-2026Technical specifications for underground staged hydraulic fracturing in coal seam directional long boreholes (English PDF)

煤层定向长钻孔井下分段水力压裂技术规范

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Issued by

National Mine Safety Administration

Level / Type

National · Mandatory

Issue date

January 25, 2026

Implementation date

May 1, 2026

Scope

KA 29-2026 is the English-translated version of 煤层定向长钻孔井下分段水力压裂技术规范.

KA 29-2026 — This standard specifies the terms and definitions, layout requirements for directional long boreholes, parameters for staged fracturing, fracturing procedures, evaluation of fracturing effectiveness, and safety requirements for underground staged hydraulic fracturing of directional long boreholes in coal seams.

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Document preview — KA 29-2026

National Standard of the People's Republic of China

ICS: 13.100
Classification: D 09

Issued by: National Mine Safety Administration

[Preview only]
1 Scope
2 Normative References
2.1 Terms
3 Terms and Definitions
4 Overview
4.1 General requirements
5 Technical Requirements
6 Calibration conditions
6.1 Environmental conditions
6.2 Measurement standards and other equipment
7 Calibration items and calibration methods
7.1 Calibration Items
7.2 Calibration method
8 Expression of calibration results
9 Recalibration interval

1 Foreword

KA 29-2026 was issued by National Mine Safety Administration on 25 January 2026.

It has been in force since 1 May 2026.

The document runs to 7 pages in English translation.

2 Scope Preview

This standard specifies the terms and definitions, layout requirements for directional long boreholes, parameters for staged fracturing, fracturing procedures, evaluation of fracturing effectiveness, and safety requirements for underground staged hydraulic fracturing of directional long boreholes in coal seams. This document applies to gas drainage enhancement via underground staged hydraulic fracturing of directional long boreholes in coal seams.

KA 29-2026 falls under ICS 13.100, in the field of environment and health protection, safety.

This catalogue holds 27 other KA standards in that field.

In this catalogue, KA standards carry edition years from 2025 to 2026.

3 About this standard

Issued by: National Mine Safety Administration

English translation: about 7 pages

Chinese original: about 11,175 characters

4 Related standards

Standards on related subjects:

AQ 1043-2007 — Mining Products Safety Label

AQ 6206-2006 — Coal mine high-low concentration methane transducer

KA 36-2026 — Evaluation of rock burst risk based on comprehensive index method

KA 30-2026 — Technical specification of ventilation in metal and nonmetal underground mines

KA 28-2026 — Methods for evaluating coal seam outburst risk

5 Classification and status

International classification (ICS): 13.100

Chinese Standard Classification (CCS): D 09

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 7 pages — is available in the English PDF.

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