E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 12/00 (2006.01) E21B 17/10 (2006.01)
Patent
CA 2207809
A cutting bed impeller (10) comprises a body portion and a plurality of paddles (24) projecting from the body portion, one or more of the paddles (24) having a recess (18) on its leading face in the direction of rotation of the impeller (10). The radially outer face (26) of one or more of the paddles (24) may be provided with one or more replaceable wear elements (30, 38). For example the elements may comprise nylon inserts (30) fitted into openings (28) in the radially outer faces (26) of the paddles (24).
Pilot Drilling Control Limited
Sim & Mcburney
Swietlik George
LandOfFree
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