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| | Petroleum industry - Wikipedia, the free encyclopedia |
 | | Oil accounts for a large percentage of the world’s energy consumption, ranging from a low of 32% for Europe, Eurasia, and the Asia Pacific region, up to a high of 53% for the Middle East. |
 | | Oil companies are generally categorized as "supermajors" (BP, Chevron, ExxonMobil, ConocoPhillips and Shell), "majors," and "independents" or "jobbers." Most upstream work in the oil field or on an oil well is contracted out to drilling contractors and oil field service companies. |
 | | Petroleum is a non-renewable natural resource and the industry is faced with the spectre of the inevitable eventual depletion of the world's oil supply. |
| en.wikipedia.org /wiki/Oil_industry (595 words) |
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