Under reamer

Details Under reamer Under reamer

E - Fixed Constructions

21

B

E21B 10/26 (2006.01) E21B 10/32 (2006.01)

Patent

CA 2388793

An under reamer for expanding a borehole through an earthen formation, the under reamer comprising: a mandrel including an end for connection into a drill string and an opposite end; a housing including an inner bore, telescopically disposed over the mandrel and axially moveable relative to the mandrel, the housing being rotationally moveable with the mandrel; and a plurality of under reamer arms carried on the housing, the under reamer arms formed as blocks including cutter-supporting portions in which poly-crystalline diamond compact cutters are mounted, the under reamer arms being moveable by driving the housing axially over the mandrel between a stored position extending into the bore the housing and an expanded position wherein the under reamers arms are pivoted out of the housing inner bore and support by the mandrel such that the cutter-supporting portions are exposed for use to enlarge a borehole.

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