Perform kickoff with rathole extension while reducing collision risk
due to tracking casing
In a field offshore Russia, an operator wanted to kick off an existing
wellbore to drill a new ERD well. The operation typically requires 3 different
BHAs: one to set the whipstock and mill the window, followed by a motor BHA to
perform the kick off, and a third BHA embarking an RSS to drill the rest of the
section.
Couple advanced whipstock technology with precision gyro steering
capability
Schlumberger recommended using the TrackMaster Select system and a
PowerDrive Xcel RSS. The mill behavior and cutting structure of the TrackMaster
Select system were modeled to provide the optimal configuration for drilling
the required window to exit casing at the planned dogleg severity of
2.5°/30 m. The TrackMaster Select system was set at 81° inclination,
which is the highest achieved by a 13 3/8-in TrackMaster comprehensive
whipstock sidetracking solution.
The PowerDrive Xcel RSS would incorporate gyro technology, enabling the
BHA to kick off from the whipstock, despite the magnetic interference caused by
the casing and the whipstock, and then precisely follow the planned trajectory
to TD.
Eliminated planned trip while mitigating magnetic interference
The TrackMaster Select system completed the whipstock milling and
rathole extension in a single run. The operator eliminated a planned motor run
using PowerDrive Xcel RSS with gyro technology, saving a cumulative 5 days of
rig time. Drilling followed the planned trajectory without incident due to the
gyro technology. Additionally, the near-bit continuous inclination enabled
dogleg severity control at 3.6°/30 m. The customer estimated that
application of the combined technology and workflow in future planned
operations could result in significant savings.
