Single bit suitable for both curve and lateral sections of shale gas well required
An operator planning to drill shale oil and shale gas exploratory wells in the Neuquen basin required an 8 1/2-in PDC bit that would drill curve and lateral sections at maximum penetration rates while providing good directional control. Traditionally, bits designed for the curve section have strong build tendencies and predictable toolface control but often deliver low ROP in the lateral. Conversely, bits that target the lateral section are built for aggressive, fast ROP with less directional control. A PDC bit was needed that could be run on a positive displacement motor (PDM) with a lower bend angle, enabling rotation and a high ROP in the lateral. At the same time, the bit had to be capable of producing the required rates.
Application-specific shale-optimized steel-body PDC bit selected
Using knowledge and experience gained from US shale plays, Smith Bits designed the Spear PDC bit specifically for shale drilling. BHA data, directional profile, mud properties, offset run information, and other application factors were analyzed using several proprietary modeling and database tools:
