GB/T 40548-2021Technical specification of separate layers pressure control and combined layers drainage for coalbed methane wells (English PDF)
煤层气井分层控压合层排采技术规范
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
August 20, 2021
Implementation date
March 1, 2022
Scope
GB/T 40548-2021 is the English-translated version of 煤层气井分层控压合层排采技术规范.
GB/T 40548-2021 covers coalbed methane wells that drain two or more coal seams at once, keeping the pressure of each seam under separate control while the seams produce water and gas through one wellbore.
It sets out the purpose and tasks of this kind of drainage, the pressure control method, the drainage equipment, production management and construction safety requirements, with an informative annex giving a daily drainage report.
It defines separate layers pressure control, in which packers and other tools cut the hydraulic connection between seams, and combined layers drainage. Its stated aim is to reduce reservoir damage, let each seam desorb and produce gas at the same time and improve drainage efficiency.
It applies to coalbed methane drainage projects with two or more coal seams, was issued on 20 August 2021 and has applied since 1 March 2022.
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Document preview — GB/T 40548-2021
National Standard of the People's Republic of China
- ICS
- 75.020
- Classification
- D 15
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Purpose and Mission
- 5 Pressure control method
- 6 Drainage equipment
- 7 Production management
- 8 Construction safety requirements
- Appendix A (informative) Daily report of double seam layered controlled compression seam drainage
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 of Standardization Documents" Drafting.
1 Scope
This document specifies the purpose and tasks of the drainage and production of coalbed methane wells, the pressure control method, the drainage equipment, the drainage management, and the construction safety. All requirements.
This document is applicable to CBM well drainage projects under the conditions of double seams and multiple coal seams.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 31537 CBM (coal mine gas) terminology
SY/T 6921 Safety technical specification for coalbed methane well drainage
3 Terms and definitions
The following terms and definitions defined in GB/T 31537 apply to this document.
3.1 Separate layers pressure control
Through the use of packers and other tools, the hydraulic connection between the coal seams is separated, so that the coal seams are in different periods during the whole or part of the drainage process. Technical measures under the stressful environment.
3.2 Combined layers drainage
In the process of coalbed methane drainage, multiple production layers produce water and gas through one wellbore.
4 Purpose and mission
4.1 Purpose of coal mine drainage
According to the differences in the characteristics of coal reservoirs, each target layer is sealed in its own independent pressure system, and different fluids are used to face each target coal layer. Pressure control management is implemented to reduce the damage of the reservoir during drainage, realize the simultaneous desorption and gas production of each coal seam, and improve the efficiency of drainage and production.
4.2 Coal mining task
According to the characteristics of coal reservoirs, reasonable selection of drainage equipment and pipe string structure, according to the principle of stability and continuity, optimize the drainage system, and control each coal The laminar flow pressure changes, so that each reservoir can drain and produce gas in the optimal state.
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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
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