While drilling, the mud is being circulated at 4 bbls/minute. The surface pressure seen at the pumps is 4,000 psi.
What is the power required for the mud pumps in horsepower?
Assuming the mud pumps run on gasoline, and assuming the pumps are 40% efficient (only 40% of the power of the fuel creates pumping power), how much fuel would this one mud pump consume per week if operating 24 hrs/day under these conditions?
Assuming the well is 6,375 ft deep, estimate the bottomhole pressure (at 6,375 ft) under these conditions, assuming the mud weight is 13 ppg? (The bottomhole pressure is the sum of the surface pressure and the pressure caused by the column of mud in the wellbore)
Assuming we wanted to keep the same bottomhole pressure, we could reduce the surface pressure by increasing the mud weight. What mud weight would be required to reduce the surface pressure to 0 psi but still keep the same bottomhole pressure as (c)?
How would reducing the surface pressure to 0 affect the power required to operate the pumps?