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发表于 2011-2-15 12:21 AM
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oil service companies such as SLB, Hal, BHI do the dirty work(upstream), including drilling the well, logging the formation, and installing the production tube into downhole. Oil service companies work for big oil companies, xom, bp..., independent oil companies, and national oil companies. All the big oil companies are like special banks, which have a lot of money for land leasing, drilling (of course, they pay the oil service company to do the job), and production( the last stage needs a lot of material, costs a lot too). |
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