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NB/T 11125-2023Specification for hydraulic fracturing technical program design of gas drainage hole in coal mine (English PDF)

煤矿井下瓦斯抽采孔水力压裂技术方案设计规范

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Issued by

NEA

Level / Type

Industry · Recommended

Issue date

February 6, 2023

Implementation date

August 6, 2023

Scope

NB/T 11125-2023 is the English-translated version of 煤矿井下瓦斯抽采孔水力压裂技术方案设计规范.

NB/T 11125-2023 is the Chinese energy industry standard for designing the technical scheme of hydraulic fracturing in gas drainage boreholes drilled underground in coal mines.

It specifies the data to prepare, namely geological data, mine production data and fracturing hole data, and the design content: borehole completion, choice between integral and multistage fracturing, fracturing fluid, fracturing parameters, fracturing equipment, sealing and construction design.

Safety clauses address prevention of coal and gas outbursts, quality, health and environmental protection, a fracturing safety plan and construction quality control.

Informative annexes give a site data collection format, an example fracturing curve and an outline of the scheme design book. Issued on 6 February 2023, it has applied since 6 August 2023.

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Document preview — NB/T 11125-2023

National Standard of the People's Republic of China

ICS: 73.020
Classification: D 15

Issued by: National Energy Administration of the People's Republic of China

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Data preparation
4.1 Geological data
4.2 Mine Production Data
4.3 Fracturing hole data
5 Design content and requirements
5.1 Well completion design
5.2 Fracturing method
5.3 Selection of fracturing fluid
5.4 Design of fracturing parameters
5.5 Selection of fracturing equipment
5.6 Sealing method and requirements
5.7 Fracturing construction design
6 Safety technical requirements
6.1 Requirements for preventing and controlling coal and gas outbursts
6.2 Quality, safety, health and environmental protection requirements
6.3 Fracturing safety plan
6.4 Construction organization and quality control
7 Fracturing scheme design book
Appendix A (Informative) Fracturing construction site data collection format
Appendix B (Informative) Fracture Curve Example Figure
Appendix C (Informative) Fracturing Scheme Design Outline Reference

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 data preparation, design content and requirements, and safety technology for the hydraulic fracturing technical scheme design of underground gas drainage holes in coal mines. Requirements, format of fracturing scheme design book.

This document is applicable to the technical scheme design of hydraulic fracturing for underground gas drainage holes in coal mines.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 30050 Coal Body Structure Classification

GB 50471 Coal Mine Gas Drainage Engineering Design Standards

AQ1023 General safety technical requirements for low-voltage power supply systems and equipment in coal mines

AQ1027 Coal mine gas drainage specification

AQ1028 Coal mine underground mining ventilation technical conditions

AQ1029 Coal mine safety monitoring system and testing equipment use management specification

AQ6201 General Technical Requirements for Coal Mine Safety Monitoring System

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 Hydraulic fracturing

Under the coal mine, the fracturing equipment is used to inject fracturing fluid into the target formation under high pressure through the borehole to rupture the formation and form a certain flow-conducting capacity. A technological measure of cracks.

3.2 Integral fracturing

The fracturing method is to treat the fracturing hole as a whole section and complete the fracturing at one time.

3.3 Multistage fracturing

A fracturing method in which multiple independent fracturing segments are formed in the fracturing hole and the fracturing is completed separately.

4 Document preparation

4.1 Geological data

Including geological structure, coal seam thickness, buried depth, structure, occurrence, roof and floor lithology, mechanical test parameters, gas parameters, ground stress test data

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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

AQ1023 · AQ1027 · AQ1028 · AQ1029 · AQ6201

Similar standards

NB/T 11124-2023|NB/T 11325-2023|NB/T 10371-2019|GB/T 42638-2023|GB 41022-2021|GB/T 34547-2017

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