While drilling the 6 1⁄8-in section, an abrupt formation change
caused the BHA to exit the target zone. The SlimPulse retrievable MWD service
delivered real-time gamma ray data that enabled the well placement team to
quickly reenter the zone. A conventional drive system might have deflected on
reentry, but the PowerDrive Archer system with full directional control
corrected to the well plan without issue.
Landed curve, drilled lateral to TD in one run
Using the PowerDrive Archer RSS, the Schlumberger team drilled the build
section at 10°/100 ft to land in the Third Bone Spring formation according
to plan. After landing the curve, the BHA continued on to drill the 4,300-ft
lateral to TD. The two sections were successfully drilled in one run despite
the abrupt formation change that caused a zone exit. The PowerDrive Archer BHA
drilled 4,787 ft total in only 110.3 hours, saving Cimarex an estimated 26
hours by eliminating the need for multiple trips.