GB/T 35053-2018Sealed coring method for determination of coalbed methane content (English PDF)
煤层气含量测定用密闭取心方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 14, 2018
Implementation date
September 1, 2018
Scope
GB/T 35053-2018 is the English-translated version of 煤层气含量测定用密闭取心方法.
GB/T 35053-2018 describes how to take sealed coal cores so that the coalbed methane content of a seam can be measured without losing the gas in the core.
It explains the principle: once the target seam is reached, a sealed coring tool is run in, the core is cut and then sealed in the inner barrel by closing a ball valve or another sealing method before being retrieved, for example by wire-line.
It specifies the equipment, including the coring barrel, inner barrel assembly, sealed coring bit and wire-line overshot, the sealed coring procedure itself and the quality review, with an informative coring record form.
It applies to coal and coalbed methane exploration and development, and may also be used when sampling for shale gas content. It was issued on 14 May 2018 and has applied since 1 September 2018.
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Document preview — GB/T 35053-2018
National Standard of the People's Republic of China
- ICS
- 73.040
- Classification
- D 20
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Method Summary
- 5 Equipment
- 6 closed coring method
- 7 Quality Review
- Appendix A (informative appendix) Coal seam sealing coring record table
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This standard specifies the method summary, equipment, closed coring method and quality review of the closed coring method for the determination of coalbed methane content.
This standard is applicable to the sealing of coalbed methane content in the exploration and development of coal and coalbed methane. The sampling of shale gas content can be used for sampling. Test use.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 19559 Determination method of coalbed methane content
GB/T 28753 Determination of coalbed methane content by heating desorption method
GB/T 31537-2015 CBM (mineral gas) terminology
3 Terms and definitions
The following terms and definitions as defined in GB/T 31537-2015 apply to this document. For ease of use, the following is repeated Certain terms and definitions in GB/T 31537-2015.
3.1 Closed coring
In the process of drilling the target interval in the borehole, the core valve is closed or other sealing method is adopted to prevent the escape of the coal core gas. The method of taking the heart.
3.2 Wire-line core drilling
The drilling technique of taking out the core accommodating pipe through the inner hole of the drill pipe without lifting the drill by using the fishing device with the rope. [GB/T 31537-2015, definition 4.1.4]
3.3 Coalbed methane content
The amount of methane and heavy hydrocarbons contained in a unit mass of coal. Expressed in gas volume at standard temperature and standard pressure.
4 Method summary
After drilling the target horizon, all the drilling tools in the well are proposed, and the closed coring device is connected with the drill pipe and sent to the predetermined position in the well, and the core is taken and taken.
After the end of the heart, the pumping fluid is used to pressurize the coring ball valve to close or seal the core, and the core is sealed in the inner tube of the coring machine.
The rope is salvaged or extracted to extract the coring machine, and then the coal core for determining the coalbed methane content is obtained.
5 Equipment
5.1 Closed coring tool
The closed coring tool should include a coring device, a coring inner cylinder assembly, a closed coring bit, a rope fishing head, a adapter, etc., as shown in Fig. 1.
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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
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Related Standards
GB/T 19559-2021 — Method of determining coalbed methane content
GB/T 28753-2012 — Determining of coalbed gas content - Heating desorption
GB/T 31537-2015 — Terms relating to coalbed methane (coal mine gas)
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