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NB/T 11124-2023Specification for coalbed methane extraction technical program design of staged hydraulic fracturing horizontal well in coal seam roof (English PDF)

煤层顶板水平井分段压裂抽采煤层气技术方案设计规范

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Issued by

NEA

Level / Type

Industry · Recommended

Issue date

February 6, 2023

Implementation date

August 6, 2023

Scope

NB/T 11124-2023 is the English-translated version of 煤层顶板水平井分段压裂抽采煤层气技术方案设计规范.

NB/T 11124-2023 is the Chinese energy industry standard for designing the technical scheme of coalbed methane extraction through horizontal wells drilled in the coal seam roof and stimulated by staged hydraulic fracturing.

It lists the input data needed, from coal mine records, adjacent wells and surface conditions, and then sets design content and methods: well location, choice of the horizon for the horizontal section, well type, drilling and completion, perforation, fracturing and drainage.

Health, safety and environmental requirements are included, and an informative annex outlines the design document itself. The method targets broken, soft, low-permeability seams, and the text draws on standards such as GB/T 41164, NB/T 10001 and SY/T 5724. Issued on 6 February 2023, it has applied since 6 August 2023.

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Document preview — NB/T 11124-2023

National Standard of the People's Republic of China

ICS: 73.040
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 Materials required for design
4.1 Coal Mine Information
4.2 Adjacent well data
4.3 Surface data
5 Design content, methods and technical requirements
5.1 Considerations for well location deployment
5.2 Requirements for selection of drilling horizons in the horizontal section of horizontal wells
5.3 Horizontal well type
5.4 Drilling and Completion Design
5.5 Perforation method
5.6 Fracturing design
5.7 Drainage design
6 Health, Safety and Environmental Protection Requirements
7 Design Book
Appendix A (Informative) Outline of Design Document

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 required for the design of the coalbed methane technical scheme design by staged fracturing of the horizontal well on the roof of the coal seam, the design content, method and Technical requirements, health, safety and environmental protection requirements.

This document is applicable to the technical scheme design of coalbed methane extraction by staged fracturing in horizontal wells on the roof of coal seams.

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 31033 Oil and Gas Drilling Well Control Technical Specifications

GB/T 35053 Sealed coring method for determination of coalbed methane content

GB/T 40546 Code for Design of Coalbed Gas Well Drainage Engineering

GB/T 41164 Technical specifications for staged fracturing of horizontal wells on the roof of broken soft low permeability coal seams

DZ/T 0250 Coalbed Methane Drilling Operation Specification

NB/T 10001 Coal bed gas fracturing operation specification

NB/T 10021 Coalbed methane logging operation specification

SY/T 5435 Orientation Well Trajectory Design and Trajectory Calculation

SY/T 5480 Cementing Design Code

SY/T 5619 BHA design method for directional wells

SY/T 5724 Casing String Structure and Strength Design

SY/T 6276 Oil and Gas Industry Health, Safety and Environmental Management System

SY/T 6543 Technical Specification for Underbalanced Drilling

SY/T 6691 Open hole logging design specification

SY/T 6692 Technical Specifications for Logging While Drilling

SY/T 6922 Coalbed Methane Well Downhole Operation Safety Technical Specifications

SY/T 7070 Microseismic Borehole Monitoring Technical Regulations

SY/T 7372 Microseismic Ground Monitoring Technical Regulations

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 Broken soft low-permeability coal seam

Under the action of geological tectonic movement, the coal seam is kneaded, squeezed and deformed, and the structure of the coal body is destroyed in the form of fragments, granules, powder.

A coal seam that is scaly and compacted by the overlying strata, resulting in low permeability.

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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

SY/T 5435 · SY/T 6543 · SY/T 6692 · SY/T 6922

Similar standards

GB/T 41164-2021|GB/T 40545-2021|NB/T 11125-2023|GB/T 46549-2025|GB/T 41044-2021|GB/T 25217.14-2020

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