Alarm means for use with apparatus protecting a device situated

Details Alarm means for use with apparatus protecting a device situated Alarm means for use with apparatus protecting a device situated

1981-01-29

1983-11-08

Pate, III, William F.

Wells

With heating, refrigerating or heat insulating means

166 66, 166179, E21B 3312

Patent

active

044136781

ABSTRACT:
Apparatus situated in a borehole traversing an earth formation is protected from closing of the borehole by being encased in an inflatable device. Surface equipment inflates and maintains the inflatable device at a sufficient pressure so as to prevent the earth formation from closing in and contacting the apparatus. A pressure sensor senses the maintenance pressure and provides a corresponding signal. An alarm circuit provides an alarm when the pressure decreases below the sufficient maintenance pressure level.

REFERENCES:
patent: 2564198 (1951-08-01), Elkins
patent: 3141099 (1964-07-01), Brandon
patent: 3753257 (1973-08-01), Arnold
patent: 3995694 (1976-12-01), Freiburger
patent: 4140179 (1979-02-01), Kasevich et al.
patent: 4185691 (1980-01-01), Tubin
patent: 4236113 (1980-11-01), Wiley

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