Boring or penetrating the earth – With signaling – indicating – testing or measuring – Signaling or indicating condition of cutting in cuttings...
Patent
1984-08-31
1986-07-22
Levy, Stuart S.
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
046013547
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. The sensor includes a reed switch mechanically imbedded in a support sleeve of a custom safety sub attached to the outer core barrel and electrically actuated by an adjacently positioned signature magnet fitted to the inner barrel to connect a power source uphole from the core barrels with a driver valve of a mud pulser system.
During coring, circumferential passage of the reed switch adjacent to the signature magnet (during rotation of the outer core barrel to generate a core), allows the power source to periodically activate the valve driver to produce a series of mud pulses of constant repetition rate. But with the occurrence of rotation of the inner core barrel irregular repetition rates are produced at uphole indicating 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: 3982433 (1976-09-01), Stout
patent: 4134100 (1979-01-01), Funke
patent: 4492275 (1985-01-01), Campbell et al.
patent: 4499955 (1985-02-01), Campbell et al.
patent: 4499956 (1985-02-01), Campbell et al.
Barnum Dean C.
Campbell Frank L.
Corea William C.
Chevron Research Company
Hannon Thomas R.
Keeling Edward J.
Levy Stuart S.
Messner H. D.
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