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Materials required for off-shore well

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Hello, I am working on a consulting assignment to develop an order of magnitude estimate for the materials required for an off-shore oil well.  So far, I have come up with the following:

Assumptions:  Drill depth: 10,000 ft; Water depth: 2,000 ft

Primary materials required:

- Casing tubes: 10,000 ft x 3 (multiple layers)

- Riser tubes: 2,000 ft x 2

- Cement: 8 sacks / ft = 80,000 sacks x 94 lb/sack =  7,520,000 lbs

- Mud: 6,000 barrels

- Fuel: 3,500 gallons/day x 60 days

- Water: ___

- Others (well head, etc.)

I understand that each well is different and the engineering designs are needed to determine the materials correctly.  Questions for the group:

- Do the estimate seem reasonable?

- Am I missing something major?



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