| PETROTECH OIL AND GAS LIMITED | Private company limited by shares | Dissolved |
| PETROTECH ASIA LIMITED | Private company limited by shares | Live |
| PETROTECH CO., LIMITED | Private company limited by shares | Live |
| OILROAD PETRO-TECH CO., LIMITED | Private company limited by shares | Live |
| PETRO-TECH PERUANA CO., LIMITED | Private company limited by shares | Dissolved |
| PHOENIX PETRO-TECH CO., LIMITED | Private company limited by shares | Dissolved |
| Delta Petrotech Limited | Private company limited by shares | Live |
| H-STAR PETROTECH COMPANY LIMITED | Private company limited by shares | Live |
| PETRO-TECH INNOVATION LIMITED | Private company limited by shares | Live |
| MEECAN PETROTECH LIMITED | Private company limited by shares | Live |
| Sino-Can PetroTech Limited | Private company limited by shares | Live |
| Petro-tech Solutions Limited | Private company limited by shares | Live |
| TORO UCONS PETROTECH LIMITED | Private company limited by shares | Dissolved |
| UNITED PETROTECH LIMITED | Private company limited by shares | Live |