Definition
Sidetrack — A sidetrack is a new wellbore drilled off to the side of an existing hole, either to bypass an obstruction or junk that cannot be recovered or to redirect the well toward a new target, typically started with a whipstock or by drilling off a cement plug.
Also known as: sidetrack, sidetracking, side-track
What a sidetrack is
A sidetrack departs from an existing wellbore to drill a new hole alongside the original path. Operators sidetrack to get around an unrecoverable fish or junk, to steer away from a collapsed or problem section, to correct a well that drifted off target, or to reach a new geological objective from an existing well. The point where the new hole leaves the old one is the kickoff, and from there a directional assembly builds the new trajectory.
How a sidetrack is started
In open hole or cased hole, a whipstock — a wedge-shaped deflection tool — is set to force the bit or mill into the wall and start the new hole. Alternatively, a cement plug is set and the bit is kicked off the plug. A mud motor or rotary steerable system with MWD then steers the sidetrack along its planned path, controlling dogleg severity so the new hole is drillable and completable.
Why it matters for rentals
Sidetracking needs whipstocks, mills, motors, and directional tools assembled for the specific well.
Rent the downhole tools and BHA components for a sidetrack, or contact us to plan a kickoff and steering assembly.