(Solved): A drillstring composed of only drillpipes (DP) and bit was run into a directional well. Consider tha ...

A drillstring composed of only drillpipes (DP) and bit was run into a directional well. Consider that the 15,000-ft (measured depth) well was drilled vertically to 6,000 ft and the remainder of the well is inclined (straight line) from vertical at 40 deg. The reservoir at bottom has a formation pressure equal to 6,190 psi.

Given:
DP OD = 5 in
DP ID = 4.2 in
Hole size (constant) = 8.5 in
Bit depth (measured) = 15,000 ft
Mud weight = 10 ppg
Flowrate = 400 gpm

Determine:

a) Drillpipe displacement factor in bbl/ft; gal/ft, and ft3/ft

b) Mud annular velocity (in ft/min)

c) Time required to pump mud from surface to bit (in min)

d) Time required to pump mud from bit to surface (in min)

e) Minimum mud weight required to drill safely the reservoir at bottom (in ppg).
Round to the nearest tenth.

A drillstring composed of only drillpipes (DP) and bit was run into a directional well. Consider that the 15,000-ft (measured depth) well was drilled vertically to $$6,000\mathrm{ft}$$ and the remainder of the well is inclined (straight line) from vertical at $$40\mathrm{deg}$$. The reservoir at bottom has a formation pressure equal to 6,190 psi. Given: Determine: a) Drillpipe displacement factor in $$\mathrm{bbl}/\mathrm{ft}$$; gal $$/\mathrm{ft}$$, and $${\mathrm{ft}}^3/\mathrm{ft}$$ b) Mud annular velocity (in $$\mathrm{ft}/\min$$ ) c) Time required to pump mud from surface to bit (in min) d) Time required to pump mud from bit to surface (in min) e) Minimum mud weight required to drill safely the reservoir at bottom (in ppg). Round to the nearest tenth.