We run about 30k weight on these at 130- 150 RPM.
(About 80 RPM from the mud turbine downhole motor it attaches to, and another 50 RPM with the rotary table at surface.
I slide for direction with only the downhole motor. Pump rate determines motor HP output as well as bit RPM)
Cost? This one is about $50,000.00
No one buys them unless they ruin them, all bits are leased since Howard Hughes reinvented the drill bit business upon taking over Hughes bits from his grandfather.
(I think it was his grandfather)
When Howard did that it changed the entire industry and reaped him his fortune.
This particular bit is not a Hughes however.
It's a different brand.
The "jets" you can see are where the fluid comes out.
At our average pump rate of 550 gallons a minute, the internal pressure is about 2500 PSI.
TFA (Total flow area) of the jets is 1.856 sq. inches.
The fluid velocity out of those jets at those parameters is 95 fps (feet per second)
It keeps the cutters clean and cool!
Last edited by thatguy; 12-16-2013 at 07:18 PM.
Tommy
"So as through a glass, and darkly
The age long strife I see
Where I fought in many guises,
Many names, but always me."
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