Core cutter head

Details Core cutter head Core cutter head

E - Fixed Constructions

21

B

E21B 10/02 (2006.01) E21B 10/60 (2006.01)

Patent

CA 2115543

A. core bit, in particular for a reservoir evaluation coring, comprising : - a body (5) which is rotatable around a rotation axis (6), - blades (8) provided onto the body (2) at least in front of this body, - several cutters (10) divided along each blade (8) and having each a cutting edge (12), the cutting edges (12) being circumscribed together within an imaginary envelope disposed around a core (4) to be taken, - nozzles (13) which supply a jet of coring liquid and which emerge at the face of the body (5), at least one nozzle (13) having an outlet (15) deflecting the liquid jet substantially obliquely forwards with respect to the rotation axis (6) of the body, away from the core, preferably according to an angle larger than 45°, and advantageously larger than 50°.

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