| Oilfield Construction Engineering Co.—— |
| Provides integral comprehensive services of equipment maintenance & repair, engineering construction, pipe engineering, products manufacture and port construction. |
|
| Oil Production Services Co.—— |
| Operates FPSOs as well as provides services of offshore field operation, maintenance and environmental protection. |
|
| Oilfield Technology Services Co.—— |
| Provides complete services of EOR as well as oil production technology R & D and its application. |
|
| Supervision & Technology Co.—— |
| Provides offshore operation support and third party supervisory/technical services.
|
|
| Communication & IT Co.—— |
| Provides a variety of shore-offshore communication and IT network services.
|
|
| Human Resources Co.—— |
| Provides complete services of people recruiting, training, certification, skill verification and management. |
|
| Marketing Services Co.—— |
| Provides sales coordination and supporting services for upstream and downstream products. |
|
| Catering & Support Services Co.—— |
| Provides nutrient, hotel-like catering services. |
|
| Petrochemicals & Services Co.—— |
| Engages in operation of branch pipeline, city gas, oil product transportation, by- product reprocessing businesses. |
|
| Logistics Co.—— |
| Provides one-stop services of procurement, freight agency, transportation, customs clearance and storage etc. |
|
