Well reamer

Details Well reamer Well reamer

E - Fixed Constructions

21

B

255/80

E21B 7/28 (2006.01) E21B 10/34 (2006.01)

Patent

CA 1335198

The well reamer comprises a sub for attaching it to the drive means, a hollow housing with a central channel and radial openings in its side wall, projectable rolling cutters with shanks, mounted in the radial openings of the housing, and a mechanism for projecting the rolling cutters, including a piston and a member for locking the rolling cut- ters in their operating positions. The annular piston is connected with the housing for joint rotation therewith, and is rigidly connected with the sub. The wall of the pis- ton has radial passages made therein, establishing communi- cation between its central channel and an annular space de- fined between the walls of the piston and of the housing. The member for locking the rolling cutters is accommodated with a clearance in the central channels of the piston and of the housing, and has an annular shoulder. The central channel of the piston defines a seat for engagement with the annular shoulder of the locking member.

610485

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