Expandable eccentric reamer and method of use in drilling

Details Expandable eccentric reamer and method of use in drilling Expandable eccentric reamer and method of use in drilling

E - Fixed Constructions

21

B

E21B 10/32 (2006.01) E21B 7/28 (2006.01) E21B 10/34 (2006.01)

Patent

CA 2482122

An expandable eccentric reamer for placement in a drill string up-hole of a conventional drill bit. The reamer blade is actuated by drilling fluid pressure to radially extend to a drill out diameter greater than a pass-through diameter. The reamer body is shaped to have an eccentric outer surface configuration to accommodate the reamer blade therein. The reamer blade acts as a piston arm in response to drilling fluid pressure and moves along a shaft anchored in a hump region that forms an eccentricity in the outer surface configuration of the body. The reamer blade has an outer edge configuration that positions the cutters hereon to prevent them from engaging a casing of a well borehole upon deployment.

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