Trajectories in Guyana are classified based on their complexity, which is defined by the amount and type of directional work being performed. Historically, drilling parameter objectives had to be controlled, such as weight on bit and rpm, had to be controlled to maximize steerability output of the push the bit system, which is usually at its maximum limit. Controlling parameters is directly linked to controlling ROP, which increases the drilling time. To solve this challenge, a new way of drilling complex trajectories in Guyana was needed.
In collaboration with ExxonMobil, SLB provided a novel solution that combined the AccuStrike bit with the PowerDrive Orbit G2 RSS. As a result, ROP was increased by 65% in the highest-complexity trajectory in ExxonMobil’s development campaign while saving 34 hours of drilling time. The AccuStrike bit incorporated a proven AxeBlade™ ridged diamond element bit with a thermal-resistant diamond element bit to reduce L1 (bit to the RSS pads) distance, resulting in increased force at the steering unit. By reducing the L1 distance, higher DLS was achieved without needing to control drilling parameters. With the AccuStrike bit, the BHA was run in a negative-displacement section with optimum drilling parameters to maximize ROP. The combination of the AccuStrike bit with the PowerDrive Orbit G2 RSS set a new record for ROP in ExxonMobil's development campaign, achieving 237% increase in hard drilling interval (HDI) ROP versus conventional technology.
