Hydraulic operated reamer

Details Hydraulic operated reamer Hydraulic operated reamer

E - Fixed Constructions

21

B

255/80

E21B 7/28 (2006.01) E21B 10/32 (2006.01)

Patent

CA 1330434

Abstract Hydraulic operated underreamer (1) for enlargement of boreholes. The underreamer comprises a cylindrical body which is arranged for connec- tion to a rotating drill string. The reamer (1) has an outer movable cylinder (2) which is streching out in the whole length of the reamer for protection of the inner parts. The reamer has cutter support arms (5) which in operative state are extending out from the body and in closed state are completely retracted within the cylindrical body. Cutters are mounted on the support arms (5), which are axially movable. The outer cylindres (2) have openings for passage of the support arms.

572898

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