04-21-2011 06:14 PM
In general the hp required varies greatly with the geography and type of well. A small mobile drilling rig at a low drilling depth can run on as low as 500hp, where as a large land rig designed for unconventional plays with horizontal drilling capability can take up to 7,400hp.
The main power consumers on a land rig will be the mud system (500-3000hp), draw works (500-3000hp), and the top drive/rotary system (250-2000hp). The mud system runs fairly constantly while drilling, while the draw works and rotary system are more intermittent depending where the rig is in the drilling cycle.
A land rig is typically rated horsepower wise by it's draw works rating.
04-21-2011 07:10 PM
On the general CAT website look under INDUSTRIAL ENGINES and see what you can find. Your local dealer can also provide you with the A & I application guide for Industrial engines which calculates the duty cycles and hp needs for your potential need. Industrial engines are a rather cyclical product with varying load applications so I would start with your dealer and make sure you understand the rating definitions based on what your load factor will be at the operation conditions of your application.
Hope that helps,
04-21-2011 07:38 PM
See if your local dealer can get you a copy of LEBW1414-00, Petroleum Application and Installation Guide. This is a non current guide, but is still available on Power Net.
Also LEBV0915 has some rule of thumb numbers, (page 147)
Hoisting, BHP= Weight X FPM (assume 100 if unknown) / 33,000 X 0.85 (eff)
Mud Pumps, BHP = GPM X lbs.gal X feet of head / 33,000 X pump eff
Rotary table depth 0-4000 ft BHP 75
4000-8000 ft 100
11-20-2012 05:10 PM
Trying to get a sense of the power factor a generator plant experiences on a drilling rig.
Land based electric drilling modules
Deep & horz. drill +/-6-7K' vert., +/- 6K' horz.
3 X 3512C 600V typical
Normal or average power factor?
Worst case power factor and for how long of a sustained time?
Normal or average load (KWe) ?
Worst case peak load (KWe) typical and for how long of a sustained time?