Spear Bit for Shale

Smith Bits, a Schlumberger company, has released the next generation of its Spear shale-optimized steel-body polycrystalline-diamond-compact (PDC) drill bit (Fig. 8), tailored for unconventional shale plays. A range of application-specific features were incorporated into the next-generation bit, including improved body geometry and hydraulic enhancements. It was engineered to minimize blade packing, improve cutter cleaning, and increase rate of penetration (ROP). Cutter layouts were fine tuned with the company’s IDEAS integrated drillbit-design platform to deliver improved ROP while ensuring smooth directional control. In the Eagle Ford shale, the first-generation steel-body PDC bit established the field benchmark for drilling the lateral in one run. The next-generation bit design was introduced into the same application and set a new performance record. For one customer, the new bit drilled the entire lateral at an average rate of 79 ft/hr, compared with the median performance of 65 ft/hr, representing a 22% improvement in ROP.

Fig. 8: Smith Bits’ shale-optimized steel-body Spear PDC bit.

 


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