Home / Standards / GB/T 40546-2021 GB/T 40546-2021 Active Design specification for coalbed methane well drainage engineering 煤层气井排采工程设计规范 Standard Type GBT ICS 73.040 CCS D15 Status 现行 Issue Date 2021-08-20 Implementation 2022-03-01 Responsible Dept 中国煤炭工业协会 Drafting Unit N/A