Boring or penetrating the earth – With signaling – indicating – testing or measuring – Signaling or indicating condition of cutting in cuttings...
Patent
1983-08-12
1985-01-08
Novosad, Stephen J.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Signaling or indicating condition of cutting in cuttings...
175 58, E21B 4709
Patent
active
044922752
ABSTRACT:
In accordance with the present invention, rotation of the inner barrel relative of the axis of symmetry of the core barrel (indicative of core twist off or core sand erosion during coring operations) is detected by a novel sensor combination comprising a Hall-effect device imbedded in a support sleeve of a custom safety sub attached to the outer core barrel adjacent to a signature magnet fitted to the inner barrel.
During coring, circumferential passage of the Hall-effect device adjacent to the signature magnet (during rotation of the outer core barrel to generate a core), produces a series of signals of constant repetition rate. But with the occurrence of rotation of the inner core barrel irregular repetition rates are produced at uphole indicating equipment connected to the Hall-effect device through conventional downhole telemetering and power generating equipment. Result: sticking and jamming of the core can be immediately detected and uphole parameters modified to ease unsafe conditions.
REFERENCES:
patent: 2929612 (1960-03-01), Le Bus, Sr.
patent: 3693428 (1972-09-01), Le Peuvedic et al.
patent: 3982433 (1976-09-01), Stout
patent: 4134100 (1979-01-01), Funke
Barnum Dean C.
Campbell Frank L.
Corea William C.
Chevron Research Company
Dang Hoang C.
Keeling Edward J.
Messner H. D.
Novosad Stephen J.
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