Drill tight curve through hard, interbedded formations
When drilling the Avalon shale play of New Mexico, Cimarex Energy wanted to drill high-dogleg-severity (DLS) curve sections with 12°/100-ft build rate while achieving maximum ROP. The play’s highly interbedded lithology includes thick sections of limestone. The unpredictable, transitional nature of the formation was unsuccessfully drilled with conventional PDC bits, and roller cone hybrid bits had low ROPs and potential reliability issues. For this operation, Cimarex wanted to maximize ROP and build rates to kick off the curve section deeper in the lithology column, landing the borehole at the precise location needed to maximize reservoir exposure in the lateral.
Accomplish drilling objectives using fit-for-purpose StingBlade bit
Using the IDEAS platform to simulate drillstring and wellbore geometry and to understand the rock-cutter interaction, Schlumberger engineers developed a custom-designed StingBlade bit with Stinger conical diamond elements across the bit face. The Stinger elements’ unique conical shape enables drilling with significantly less torque than conventional PDC cutters. This reduces reactive torque fluctuations when drilling directionally, allowing StingBlade bits to stay on target with better toolface control and achieving higher build rates with fewer adjustments by the directional driller. Stinger elements also apply a higher concentrated point load on the rock, and the thicker diamond layers enhance impact strength and wear resistance. The result is longer runs at higher ROPs in challenging applications that cause damage to conventional bits.