Natural Gas Drilling


1. Use of natural gas instead of dry air reduces the risk of downhole fires in underbalanced drilling.

A. True
B. False

2. The cuttings transport efficiency of natural gas is __________ that of dry air.

A. less than
B. equal to
C. more than

3. Assuming the same cuttings transport efficiency, the bottomhole pressure in natural gas drilling is __ compared to air.

A. lower
B. higher

4. During underbalanced drilling with natural gas, the returning gas is typically:

A. stored in tanks.
B. diverted to a separator and re-circulated.
C. connected to a pipeline.
D. flared.

5. Which of the following documents provides recommended practices for Area classifications of electrical installations at drilling rigs and production facilities on land and offshore platforms?

A .National Fire Protection Association (NFPA) 70
B .NFPA 496
C .American Petroleum Institute API RP500B

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