Bit positioning while drilling system

Details Bit positioning while drilling system Bit positioning while drilling system

1977-05-02

1979-03-20

Moskowitz, Nelson

Acoustics

Geophysical or subsurface exploration

Well logging

175 45, 340 155CP, 340 155TD, G01V 136, E21B 4702

Patent

active

041449495

ABSTRACT:
A method and apparatus for determining the precise position of the drill bit on the bottom of a long drill string in a deep borehole in the earth during a drilling operation, comprising placing a plurality of geophones in an array near the surface of the earth above the expected position of the drill bit in the earth, causing at least a weak seismic wave to be initiated at the drill bit in the earth, repeating the source a great many times and determining at the surface of the earth the times of initiation of each of the seismic waves, determining the incremental movement of the drill pipe in the hole, and responsive to the known times of initiation and the known incremental movement of the drill pipe into the hole, stacking each of the repeated geophone signals from each of the geophones for each of the repetitions of the source, whereby each of the stacked signals will be in phase with those that resulted from earlier and later repetitions of the source.

REFERENCES:
patent: 2062151 (1936-11-01), Weatherby
patent: 2101408 (1937-12-01), Mozzry
patent: 3278894 (1966-10-01), Sanders
patent: 3817345 (1974-06-01), Bailey
patent: 3876016 (1975-04-01), Stinson
patent: 3940734 (1976-02-01), Blum
patent: 3979140 (1976-09-01), Silverman
patent: 4003017 (1977-01-01), Bailey
patent: 4040003 (1977-08-01), Brynet et al.
patent: 4058791 (1977-11-01), Martin et al.

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