1.Exploration
2.Drilling
3.Field activities
4. Recovery – 3 stages (primary, secondary and enhanced oil recovery). The three stages of recovery may take 30 to 40
years to complete
5. Water disposal
6. Refining and marketing
7. Transportation
8. Expansion and contraction of plants, buildings and equipment
9. Preventive maintenance and safety
10. Major renovations, upgrading and replacement of facilities
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