Patent ID: 8973680
Filing Date: 2015-03-10
Classification: E21B

Abstract:
1. A reamer for reaming a bore of a sub-surface formation, the reamer deployable into the bore via a downhole tool, comprising: a body; a longitudinal member within the body defining an axial throughbore through the body; at least one extendable cutting member operable to cooperate with an actuatable cam member, the cam member having a first configuration in which the least one extendable cutting member is extended and a second configuration in which the least one extendable cutting member is retracted; and a cam member lock activatable downhole, the cam member lock permitting movement of the cam member from the first configuration to the second configuration and preventing movement of the cam member from the second configuration to the first configuration; wherein the axial throughbore extends through the body to allow fluid to pass through the reamer in the first and second configurations without extending the cutters when the cam member lock is activated; wherein the cam member lock is configurable to restrict movement of the cam member relative to the body.