Core monitoring device

Details Core monitoring device Core monitoring device

E - Fixed Constructions

21

B

349/6

E21B 25/00 (2006.01) E21B 45/00 (2006.01)

Patent

CA 1261053

ABSTRACT OF THE INVENTION A well coring apparatus is provided with the capability for monitoring the length of the core in the inner barrel of a core barrel and the rate at which the core enters the inner barrel. The device includes a Sonic Core Monitor which is disposed in the upper end of the inner barrel and a piston which is disposed in the lower end thereof. The Sonic Core Monitor generates an ultrasonic pulse that is transmitted down to the surface of the piston and reflected back up to the Sonic Core Monitor. 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 can then be determined. If the core is proceeding at too slow a rate, a valve can be opened to allow drilling fluid to bypass the core barrel. This provides the surface operator with an indication that a jam has occurred.

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