Boring or penetrating the earth – Automatic control – In response to drilling fluid circulation
Patent
1998-04-29
2000-02-01
Schoeppel, Roger
Boring or penetrating the earth
Automatic control
In response to drilling fluid circulation
175 48, 173177, 13762418, 222262, E21B 4400
Patent
active
060191805
ABSTRACT:
A procedure is described for determining the power output of a downhole drilling motor, when the motor is inside the wellbore. The technique uses stand-pipe pressure and fluid flow rate as the main inputs. The power output of the motor is calculated by carrying out two low flow stall tests at flow rates lower than the drilling flow rate. These tests result in "off-bottom" and stall pressures at the two flow rates. Another off-bottom pressure is taken at the actual flow rate that will be used during drilling operations. From the use of the off-bottom and stall pressure measurements, a determination is made of the differential pressure across the motor and the stall pressure at the actual drilling fluid flow rate. A full power curve and a predicted operating stand-pipe pressure for optimal power generation are provided based on an experimentally verified assumption regarding the change in rotation rate of the motor versus the differential pressure across the motor power section.
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Koval Vernon
Pafitis Demosthenis
Christian Steven L.
Kanak Wayne I.
Schlumberger Technology Corporation
Schoeppel Roger
Walker Darcell
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