Home / Standards / SY 5277-1991 SY 5277-1991 Abolished 油田化学堵水剂分类及型号编制方法 Standard Type SY52 ICS N/A CCS N/A Status Abolished Issue Date 1991-07-18 Implementation 1991-02-01 Centralized Committee 能源部 Issuing Authority 能源部