Patent ID: 9534448
Date: 2017-01-03
CPC Classifications: E21B

Claim:
1. A bottom hole assembly, comprising: a drill bit arranged at a distal end of a drill string and rotatable about a first central axis, the drill bit exhibiting a first unbalance force component that acts laterally on the drill bit and perpendicular to the first central axis at a first angular orientation; a first unbalance force marking physically applied to the drill bit and corresponding to the first angular orientation of the first unbalance force component; a tool arranged axially from the drill bit and rotatable about a second central axis, the tool exhibiting a second unbalance force component that acts laterally on the tool and perpendicular to the second central axis at a second angular orientation; a second unbalance force marking physically applied to the tool and corresponding to the second angular orientation of the second unbalance force component, wherein an angular offset between the first and second unbalance force markings is able to be manipulated in order to obtain a desired tandem unbalance force between the first and second unbalance force components; and at least one of a free-lock system and an actuation device arranged in the drill string to adjust an angular orientation of the first unbalance force marking with respect to the second unbalance force marking, wherein the free-lock system is associated with at least one of the drill bit and the tool and is operable to disengage the drill bit or the tool from the drill string such that the first or second unbalance force markings may be angularly rotated until locating a desired angular orientation, and wherein the actuation device is arranged in the drill string between the drill bit and the tool.