IOCs have a higher investment potential than independent refineries - given their low investment potential, independent refiners are exposed to greater risk. NOCs from the emerging the markets are filling the void left from the retreat of IOCs.
In addition to oil and gas operators (IOC, NOC and independent), there are service providers like Halliburton, Schlumberger and Weatherford that provide services pertaining to drilling of oil and gas wells, completion jobs, well integrity and other services.
International Oil Companies (IOCs)
National Oil Companies (NOCs)
Pure-play refiners (Independent)
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