Core monitoring device with pressurized inner barrel

Details Core monitoring device with pressurized inner barrel Core monitoring device with pressurized inner barrel

1987-01-23

1988-04-05

Novosad, Stephen J.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Signaling or indicating condition of cutting in cuttings...

175 58, 175244, E21B 2500

Patent

active

047352698

ABSTRACT:
A well coring apparatus is provided with the capability for monitoring the length of the core in the inner barrel (32) of a core barrel (16) and the rate at which the core enters the inner barrel (32). The device includes a Sonic Core Monitor (78) which is disposed in the upper end of the inner barrel (32) and a piston (68) which is disposed in the lower end thereof. The inner barrel (32) is filled with a pressurized fluid. The Sonic Core Monitor (78) generates an ultrasonic pulse that is transmitted down to the surface of the piston (68) and reflected back up to the Sonic Core Monitor (78). The time between the transmitted and received pulse is then measured and distance determined therefrom. Both length of core and rate of core entry into the inner barrel (32) can then be determined. If the core is proceeding at too slow a rate, a valve (50) can be opened to allow drilling fluid to bypass the core barrel (16). This provides the surface operator with an indication that a jam has occurred.

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