Spear Bit Sets ROP Record Drilling for Shale Gas in Argentina

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:

• IDEAS integrated drillbit design platform
• DBOS drillbit optimization system for rock strength analysis
• DRS drilling record system, a collection of nearly 3 million bit runs.