Separable drill hole transmitting device

Details Separable drill hole transmitting device Separable drill hole transmitting device

G - Physics

01

V

349/5

G01V 1/40 (2006.01) E21B 4/02 (2006.01) E21B 47/00 (2006.01) E21B 47/18 (2006.01)

Patent

CA 1178704

ABSTRACT Apparatus for transmitting information from a drill hole to the earth's surface is mounted in the drill string and comprises a plurality of axial sections or sub-units at least the uppermost of which can be separated by means of a catching tool and independently retrieved.

385941

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