Boring or penetrating the earth – Automatic control – Of advance or applied tool weight
Patent
1996-03-25
1998-01-06
Dang, Hoang C.
Boring or penetrating the earth
Automatic control
Of advance or applied tool weight
173 6, E21B 4400
Patent
active
057044368
ABSTRACT:
A method of regulating drilling conditions applied to a given well bit comprises assaying the compressive strength of the formation in an interval to be drilled by said bit. Wear of critical bit structure of the same size and design as in said given bit and which structure has drilled material of approximately the same compressive strength as that so assayed, is analyzed along with respective drilling data for the worn structure. From said analysis, a power limit for the respective compressive strength, above which power limit excessive wear is likely to occur is determined. Drilling conditions, such as rotary speed and weight-on-bit, at which the given bit is operated are regulated to maintain a desired operating power less than or equal to the power limit. Where several feasible rotary speed/weight-on-bit combinations may result in the desired operating power, these conditions are optimized.
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Goldman William A.
Smith Lee Morgan
Dang Hoang C.
Dresser Industries Inc.
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