标准编号：ISO 18871:2015
中文名称：煤层气含量测定方法
英文名称：Method of determining coalbed methane content
发布日期：2015-09
标准范围
This International standard provides methodology for measuring coalbed methane content of coalcore samples obtained by coring or sidewall coring during well drilling. This standard has to be alsoapplied to drill cuttings samples, if the equipment for the determination of the coalbed methane contentaccording to a respective national standard is not available. The selection of the most appropriatemethod 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 ofmeasuring gas content of coal (not included in this International standard) are generally based on eitherthe 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 lumpsamples. The difference among them lies in the time allowed for gas to desorb before final crushing andin sample size and shape.This International standard is applicable for the determination of the methane content of coal during coaland 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. Referencetemperature is 0 °C (273,15 K) if not stated differently. Reference pressure is 0,1 MPa (1 bar) if notstated 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 whenapplying the procedures defined in this standard
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