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.<\/p>\n
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.<\/p>\n
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.<\/p>\n
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.<\/p>\n
Procedure of free gas content determination of low rank coals need to be defined.<\/p>\n
All units used and referred to in this International standard are international standard units. Reference temperature is 0 \u00b0C (273,15 K) if not stated differently. Reference pressure is 0,1 MPa (1 bar) if not stated differently.<\/p>\n
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.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 7<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 1\tScope 2\tTerms and definitions <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 3\tApparatus 3.1\tDesorption canister 3.2\tMetering device <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 3.3\tThermostat 3.4\tTemperature measuring devices 3.5\tBarometer 3.6\tElectronic balance (top load) 3.7\tStandard sieve 3.8\tCoal crusher <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 3.9\tHose 3.10\tGas-sample bottles 3.11\tPadding 3.12\tQuick connector 3.13\tGas analyser <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 4\tSample collection 4.1\tPreparation of sampling 4.1.1\tGeneral 4.1.2\tDesorption canister 4.1.3\tMetering device 4.1.4\tThermostat 4.2\tSampling principle 4.2.1\tSample quality <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 4.2.2\tSampling time 4.3\tSampling procedure 4.3.1\tGeneral 4.3.2\tCore samples 4.3.3\tCutting samples 4.4\tCoal lump samples 4.4.1\tGeneral 4.4.2\tParameters to record <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5\tMeasuring method and process 5.1\tUse of core samples 5.1.1\tNatural desorption <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5.1.2\tMeasurement of residual gas 5.1.3\tGas sampling, composition analysis and isotope analysis <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 5.2\tUse of cuttings samples or coal lump samples 5.2.1\tQ2 measurement 5.2.2\tQ3 measurement <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 6\tData processing 6.1\tConversion of the desorbed gas volume 6.2\tReporting of gas content 6.3\tCalculation of gas composition 6.4\tCalculation of gas content 6.4.1\tGeneral 6.4.2\tCalculation of lost gas content (Q1) <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 6.4.3\tCalculation of gas desorption content (Q2) 6.4.4\tCalculation of residual gas content (Q3) <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 6.4.5\tCalculation of free gas content 6.4.6\tCalculation of gas content <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 6.4.7\tCalculation of adsorption time 6.5\tNumerical accuracy requirements 7\tMeasurement report 8\tQuality commentaries 8.1\tQuality commentary of sample collection 8.1.1\tSituations should be noted on the record <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 8.2\tQuality commentary on measuring operation 8.3\tConclusion of quality commentary 8.3.1\tQualified samples 8.3.2\tReference samples 8.3.3\tDiscard <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | Annex\u00a0A (normative) Raw data of gas natural desorption <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Annex\u00a0B (normative) Lost gas original records table <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Annex\u00a0C (normative) Lost gas volume calculation of Sample XX (direct method) <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Annex\u00a0D (normative) Cumulative gas desorption curve of sample XX <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Annex\u00a0E (normative) Measurement results table of CBM content <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Annex\u00a0F (normative) Sampling form for in-seam drilling <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Annex\u00a0G (normative) Sampling form for core drilling <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Annex\u00a0H (normative) Laboratory test form <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Annex\u00a0I (normative) Short report <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Method of determining coalbed methane content<\/b><\/p>\n |