You have just finished drilling a 7-7/8\"vertical well on 16.0ppg fluid to 15,00

Question

You have just finished drilling a 7-7/8"vertical well on 16.0ppg fluid to 15,000ft. The drill string is 5" 20.5ppf drill pipe: ID = 4.214in: Capacity = 0.01725bbl/ft: Displacements = 0.0070bbl/ft. Previously set casing is 9-5/8" 47.0ppf ID = 8.681 in and it is set from the surface down to 5500ft. Ignore BHA effects, assume all drill pipe. The pore pressure gradient of the formation at TD is 0.80 psi/ft. As the drill pipe is TOH, the fluid level will fall thus lowering the static bottom hole pressure (BHP). How many feet of drill pipe can be TOH, before the well needs re-filled to surface with fluid preventing an underbalanced condition?

Explanation / Answer

the furnished drilling is the dill string usedf for the development of the various

tools in te derilling process.

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