Electricity: measuring and testing – Electrical speed measuring
Patent
1984-04-11
1986-03-25
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Electrical speed measuring
324225, 324226, 324174, 175 40, E21B 4700, G01N 2772, G01D 342
Patent
active
045786429
ABSTRACT:
A tubing trip tool for use in determining the extent of defects in tubular elements comprising a continuous string used in a subterranean oil or gas well during removal of the string from the well is disclosed. Local defects and axially extending defects, as well as the average wall thickness of the tubular elements, are measured. The position of the defects is determined by measuring the variable velocity of the tubular elements as they are removed from the well. A noncontact axial velocity detector comprises detector elements generating a first signal dependent upon an applied magnetic field and the axial velocity of the tubular elements. The first signal is compared to a signal dependent only upon the magnetic field generated in a second element. A pickup coil and Hall effect probes can be used.
REFERENCES:
patent: 3197693 (1965-07-01), Libby
patent: 3328681 (1967-06-01), Wood
patent: 3609530 (1971-09-01), Johnson
patent: 3693075 (1972-09-01), Forster
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patent: 3916301 (1975-10-01), Vild
patent: 4079312 (1978-03-01), Osborn
patent: 4270088 (1981-05-01), Weischdel
patent: 4292588 (1981-09-01), Smith
Milewits Marvin
Moake Gordon L.
Eisenzopf Reinhard J.
PA Incorporated
Solis Jose M.
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