9
Computer software for economic and technological analysis of the operation and performance of oil and gas fields; Computer software for economic and technological analysis of the operation and performance of oil and gas fields
35
Economic analysis of the operation and performance of oil and gas fields; commercial management of the operation of oil and gas fields; advisory and consultancy services in relation to the aforesaid services; Economic analysis of the operation and performance of oil and gas fields; commercial management of the operation of oil and gas fields; advisory and consultancy services in relation to the aforesaid services
37
Installation and maintenance services for oil and gas well casings, tubings, and drill pipes
42
Technological services, namely, geophysical exploration of oil and gas field; technological services for optimizing the performance of oil and gas fields, namely conducting measurements of reservoirs and petroleum deposits and drafting expert engineering reports; industrial analysis and research, namely, interpreting and modeling data in connection with mineral and oil assaying; consultation regarding the aforesaid services