With a temperature rating of 302°F [150°C] and providing azimuthal gamma ray measurements close to the bit for real-time detection of slip and fault boundaries, Schlumberger said the PowerDrive X5* system operates reliably in hot holes, increases time on bottom through downlink and efficient directional control and features a tangent and inclination hold function.

"The system has been designed for hot, tough drilling environments and for reservoirs in which geosteering is aided by near-bit gamma ray or where tighter total vertical depth control is required," said Paul Wand, business development manager, Schlumberger Drilling Technologies. "Typically these targets are found in offshore and high-tier markets."

Developed to increase run length, optimise wellbore placement and reduce drilling time, the PowerDrive X5 system provides significant reliability and efficiency gains. The automatic inclination hold and efficient downlink functions minimize needed interaction with the directional driller to maintain directional control while drilling ahead. Increased productive time on bottom is the result.

This fully rotational system incorporates real-time 360° azimuthal gamma ray measurement for geosteering applications and enables drillers and geologists to identify bed boundaries quickly. An MWD-type triaxial sensor package close to the bit provides accurate azimuth and inclination information and allows fast, responsive directional control in either automatic or manual operation mode, and enables tight control of TVD.

Design efficiencies gained in the area of the control and bias units, facilitates longer runs, optimum wellbore placement, and a reduction in drilling time. The system, with chassis-mounted electronics, utilises the latest Schlumberger electronics design standards.