Home / Standards / GB/T 24504-2025 GB/T 24504-2025 Active Method of injection/falloff well test for coalbed methane well 煤层气井注入/压降试井方法 Standard Type GBT ICS 73.040 CCS D20 Status 现行 Issue Date 2025-08-01 Implementation 2026-02-01 Responsible Dept 中国煤炭工业协会 Drafting Unit N/A