M00001481
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ISO 18871 1st Edition, September 15, 2015 Method of determining coalbed methane content
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Availability date: 07/13/2021
Description / Abstract:
This International standard provides methodology for measuring
coalbed methane content of coal core samples obtained by coring or
sidewall coring during well drilling. This standard has to be also
applied to drill cuttings samples, if the equipment for the
determination of the coalbed methane content according to a
respective national standard is not available. The selection of the
most appropriate method shall consider the purpose of the test and
the possibilities of sampling.
This International standard is applicable for the direct method
of measuring coalbed methane content. It includes sample
preparation, experimental procedures and calculation methods.
Indirect methods of measuring gas content of coal (not included in
this International standard) are generally based on either the gas
sorption characteristics of coal under defined/specified pressure
and temperature conditions.
This International standard includes three types of direct
measuring methods: conventional desorption (slow desorption) of
core samples, fast desorption of core samples, fast desorption of
cuttings or lump samples. The difference among them lies in the
time allowed for gas to desorb before final crushing and in sample
size and shape.
This International standard is applicable for the determination
of the methane content of coal during coal and coalbed methane
exploration for the determination of free gas content of low rank
coals is included.
Procedure of free gas content determination of low rank coals
need to be defined.
All units used and referred to in this International standard
are international standard units. Reference temperature is 0 °C
(273,15 K) if not stated differently. Reference pressure is 0,1 MPa
(1 bar) if not stated differently.
This International standard does not point out all the potential
safety hazards associated with its use. The users are responsible
for establishing appropriate safety measures and health practices
when applying the procedures defined in this standard.