Measuring and testing – Borehole or drilling – Downhole test
Patent
1977-11-01
1978-09-19
Myracle, Jerry W.
Measuring and testing
Borehole or drilling
Downhole test
E21B 4700
Patent
active
041144350
ABSTRACT:
In a well drilling system, a drill bit is raised or lowered through formations surrounding a borehole in a response to the movement of a cable onto and off the drawworks drum. Prior to drilling operations, the drilling system is calibrated by lowering the traveling block to its lowest position above the rig floor. At this position, the distance from a predetermined reference point to the traveling block is measured as is the rotational position of the drawworks drum. Cabling is then taken into the drum until one full layering of cable is wound onto the drum. At this time, the distance from the fixed reference point to the new position of the traveling block is measured as is the amount of rotation of the drum required to move the traveling block to this position. These steps are repeated for each full layering of cable to be wound onto the drum before the traveling block reaches its maximum distance above the reference point to determine the amount of rotation required to move the traveling block the distances to the new positions. During drilling operations, the position of the traveling block in any given time is determined for any cable layering in accordance with a predetermined relationship between the measurements made during the calibration period.
REFERENCES:
patent: 3853004 (1974-12-01), Westlake et al.
patent: 3916684 (1975-11-01), Rundell
Foster, Jr. C. Mackay
Gravley Wilton
Patton Bobbie J.
Sexton James H.
Hager Jr. George W.
Huggett C. A.
Mobil Oil Corporation
Myracle Jerry W.
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