Tool driving or impacting – With indicating or signaling means – Distance of advance
Patent
1977-11-01
1979-05-29
Hafer, Robert A.
Tool driving or impacting
With indicating or signaling means
Distance of advance
731515, 33132R, E21B 4704
Patent
active
041564677
ABSTRACT:
In a well drilling system, a drill bit is raised or lowered through formations surrounding a borehole in response to the movement of a cable onto and off of a drawworks drum. Magnetic markings are affixed to the drum, and a pair of sensors detect rotational movement of the magnetic markings as the drum rotates to take in or pay out the cable. These sensors provide signals indicating both the direction and magnitude of drum rotation. These signals are digitized and selectively gated to operate a bidirectional counter whose count output is recorded as a function of time to provide a depth recording indicating penetration of the drill bit through the formations surrounding the borehole.
REFERENCES:
patent: 2842852 (1958-07-01), Tanguy
patent: 3220251 (1965-11-01), Pearson
patent: 3651871 (1972-03-01), Greene
patent: 3759489 (1973-09-01), Jones
patent: 3891038 (1975-06-01), Delestrade et al.
patent: 3931735 (1976-01-01), Guigmard
Foster, Jr. C. Mackay
Gravley Wilton
Patton Bobbie J.
Sexton James H.
Hafer Robert A.
Huggett C. A.
Mobil Oil Corporation
Scherback William J.
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