BS ISO 18871:2015提供了测量煤中煤层气含量的方法 钻井期间通过取芯或井壁取芯获得的岩芯样品。这一标准也必须得到遵守 适用于钻屑样品，如用于测定煤层甲烷含量的设备 根据相应的国家标准，不可用。选择最合适的 方法应考虑试验的目的和取样的可能性。本国际标准适用于直接测量煤层气含量的方法。 包括样品制备、实验程序和计算方法。间接测量法 测量煤的气体含量（不包括在本国际标准中）通常基于 在规定的压力和温度条件下，煤的气体吸附特性。 本国际标准包括三种直接测量方法:常规解吸法 岩芯样品（缓慢解吸）、岩芯样品快速解吸、岩屑或岩块快速解吸 样品。它们之间的区别在于，在最终破碎和干燥之前，允许气体解吸的时间 样本大小和形状。本国际标准适用于燃煤过程中煤中甲烷含量的测定 此外，还包括用于测定低煤阶煤游离气含量的煤层气勘探。需要确定低煤阶煤的游离气含量测定程序。本国际标准中使用和提及的所有单位均为国际标准单位。参考 温度为0°C（273,15 K），如果没有不同的说明。如果不是，参考压力为0.1 MPa（1 bar） 不同的说法。本国际标准并未指出与其使用相关的所有潜在安全隐患。 用户有责任在以下情况下制定适当的安全措施和健康实践: 采用本标准中规定的程序。交叉引用:ISO 11722:2013ISO 1171:2010ISO 562:2010ISO 18283:2006购买时可用的所有当前修订版均包含在本文件的购买中。

BS ISO 18871:2015 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.Cross References:ISO 11722:2013ISO 1171:2010ISO 562:2010ISO 18283:2006All current amendments available at time of purchase are included with the purchase of this document.