Patent ID: 9328563
Filing Date: 2016-05-03
CPC Classification: E21B

Claim Text:
1. An underreamer for increasing a diameter of a wellbore, comprising: a body having an axial bore extending at least partially therethrough; a sleeve coupled to the body and adapted to move with respect to the body, wherein the sleeve includes a plurality of grooves and a transition path formed therein, the plurality of grooves being circumferentially offset from one another and extending in a same axial direction away from the transition path and toward respective end portions, and wherein the end portions of at least first, second, and third grooves of the plurality of grooves are axially offset from each other; a pin coupled to the body, wherein the sleeve is adapted to rotate and move axially with respect to the pin while the pin follows the transition path, and to move only axially while the pin moves away from the transition path while within the first, second, and third grooves, the transition path serving to transition the pin from the first groove to the second groove to the third groove, and wherein the sleeve is in a first axial position with respect to the body when the pin is positioned in the first groove, the sleeve is in a second axial position with respect to the body when the pin is positioned in the second groove, and the sleeve is in a third axial position with respect to the body when the pin is positioned in the third groove; and a cutter block coupled to the body, wherein the cutter block slides outwardly from the axis of the bore from at least a first outer diameter when the sleeve is in the first axial position to a second outer diameter when the sleeve is in the second axial position.