Oil prospecting; oil-field surveys; engineering consultancy, namely, consulting in the field of engineering; technological consultancy services in the field of oil exploration for the management of assets used for oilwell drilling and production; scientific, technology, engineering, and project management research consultancy in the field of energy; scientific research and development; technological research in the field of engineering; industrial analysis and research services in the field o...

Machinery installation, maintenance and repair; oil drilling; gas drilling; construction of structures for the production of crude oil; construction of structures for the storage of crude oil; installation of oil production apparatus; construction of structures for the production of natural gas; construction of structures for the storage of natural gas; construction of structures for the transportation of natural gas; drilling of wells; drilling of deep oil or gas-wells; electric appliance in...