37
Services relating to the extraction of natural resources, namely extraction of natural gas; extraction of oil and gas from oil and gas fields; oil drilling installations, namely oil well casing, tubing, and drill pipe installation; pipeline construction and maintenance; pump repair and maintenance; construction, installation, maintenance, repair and cleaning of oil plant, rigs and installation; drilling of wells; extraction of oil and gas
39
Distribution, supply, transportation and storage of fuel, oil, petroleum, gas and lubricants; transmission, supply and distribution of electricity; transport of oil and gas by pipeline; marine transport services
40
Material processing, namely natural gas liquefaction services, gas production services; treatment, processing and refining of oil and gas; generation of gas and electricity
42
Surveying and oil and gas exploration services; analysis services for oil field exploration; oil-well testing; oil prospecting; oil- field surveys; tests being inspection for early damage diagnosis in oil-field and oil conducting plant, equipment and systems; marine, aerial and land surveying; analysis and diagnosis of oils, greases and lubricants; scientific consultancy, advisory, survey, technical, scientific, research and design services, all relating to industry, engineering, oil, chemicals, and environmental impact of process plant; geological research and geological exploration being geological surveying; inspection of oil and gas fields; engineering drawings being drafting of plans and engineering drawings for others; preparation of technical documentation and reports relating to analysis and diagnosis of chemicals, oils, greases and lubricants; analyses for oil-field exploitation; geological surveys; calibration being measuring services in the nature of measuring variables associated with the drilling of boreholes; development of industrial processes; technological analysis services relating to the drilling of wells