Registers – Coded record sensors – Particular sensor structure
Patent
1978-06-23
1980-05-13
Cook, Daryl W.
Registers
Coded record sensors
Particular sensor structure
73151, 175 40, G06K 708, E21B 4700, E21B 1100
Patent
active
042024900
ABSTRACT:
Numbers in binary form comprising apertures filled with non-magnetic material are formed in the outer periphery of drill pipe sections for identification purposes. The numbers are read by a sensor and recorded as the drill pipe sections are lowered into a well bore in order to keep track of the position of the pipe sections in the drill string and to obtain a cumulative record of the service time of each drill pipe section for the purpose of determining fatigue damage. The sensor comprises an encircling electrical coil which generates a magnetic field in the walls of the drill pipe sections as they are moved through the coil and a second electrical coil which is rotated around the drill pipe section in the vicinity of the encircling coil for detecting the magnetic field next to the filled encloding apertures of the identification numbers.
REFERENCES:
patent: 3058532 (1962-10-01), Alder
patent: 3117445 (1964-01-01), Brown et al.
patent: 3233647 (1966-02-01), Newell
patent: 3508031 (1970-04-01), Cooper et al.
patent: 3774445 (1973-11-01), Rundell et al.
patent: 3813659 (1974-05-01), Charlton
Gunkel Walter A.
Lybecker Robert W.
Cook Daryl W.
Felsman Robert A.
Hughes Tool Company
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