Apparatus and method for hard rock sidewall coring in a...

Details Apparatus and method for hard rock sidewall coring in a... Apparatus and method for hard rock sidewall coring in a...

E - Fixed Constructions

21

B

255/2

E21B 25/02 (2006.01) E21B 49/06 (2006.01)

Patent

CA 1258848

ABSTRACT A core drilling mechanism in an elongate housing is rotated from a vertical storage position to a horizontal operable position. This permits the transport downhole of a drilling mechanism of sufficient longitudinal dimension to drill a core sample of substantial length perpendicular to the borehole sidewall. A fixed slotted plate and hydraulically actuated rotatable drive plate control the motion of the drilling mechanism, which is stored vertically for descent and ascent, and rotated 90-degrees and moved outward for core drilling. After a core sample is drilled, the drilling mechanism is tilted upward to break off the core, and then returned to its vertical storage position.

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