Home / Standards / GB/T 40548-2021 GB/T 40548-2021 Active Technical specification of separate layers pressure control and combined layers drainage for coalbed methane wells 煤层气井分层控压合层排采技术规范 Standard Type GBT ICS 75.020 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