Boring or penetrating the earth – With signaling – indicating – testing or measuring
Patent
1993-10-26
1994-11-29
Buiz, Michael Powell
Boring or penetrating the earth
With signaling, indicating, testing or measuring
175 50, E21B 4400
Patent
active
053681088
ABSTRACT:
To optimize the drilling of a borehole with a positive displacement downhole mud motor which rotates a drill bit, the hydraulic power input to the motor and the mechanical power output of the motor are calculated based upon measurements of weight-on-bit (WOB), torque, bit rotational speed and pressure drop across the motor. These input and output values are plotted versus one another to produce a characteristic curve which indicates the maximum achievable power output of the motor. The values used by the driller are compared to such maximum to enable adjustment of WOB such that drilling at maximum efficiency for a given lithology can be achieved. Other important information such as optimum standpipe pressure and operating efficiency and wear of the motor also are determined.
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I. G. Falconer et al., "Separating Bit and Lithology Effects from Drilling Mechanics Data", IADC/SPE Conference Paper 17191, Dallas, Texas, Feb. 28, 1988.
Robbins and Myers, Inc., "MOYNO Down-hole Motors" Specification Data, Dec. 15, 1990.
Aldred Walter D.
McCann Dominic P. J.
Rasmus John C.
Buiz Michael Powell
Kanak Wayne I.
Moseley David L.
Schlumberger Technology Corporation
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