Casing exit systems are used to sidetrack a
wellbore for many reasons, including re-entry of an existing wellbore, drilling
a bottomhole assembly that has become stuck and is too costly to fish out,
severe formation or drilling problems, the need to change the direction of a
wellbore, or the need to drill multiple exits from a single wellbore.
Big Rig one-mill casing exit system is
retrievable and has two retrieval tool options to accommodate severe hole
conditions. A complete system includes a whipstock combination, an orientation
device, an anchoring device, and a milling tool. This system provides a quicker
kickoff with a higher build rate in short-radius drilling applications. Decreased
length of the whipstock and a milling assembly consisting of only one multi-section mill form a significantly shorter window exit bottomhole assembly
(BHA). The reduced-length BHA is capable of passing through higher doglegs in
the wellbore. Our whipstock system provides an effective means to exit casing
and provide a window to run drilling BHA, liners, and completion equipment
through.
Big Rig field-proven retrievable whipstock combination
comes with a built-in detachable deploy tool on top. The whipstock can be set
with an inflatable bottom anchor. Orientation can be performed using the lock
and orientation plug. Retrieving slot on the center of the whipstock is used
with the fixed lug retrieving hook for retrieval purpose and taper tap at the
upper section of the whipstock is used with the special taper box tap for
remedial retrieval in case the retrieving hook fails.