Measurement while drilling

Directional drilling

Measurement while drilling (MWD) tools provide the oil and gas exploration operator on the surface with vital real-time data on the direction, tilt and positioning of the drill bit in the well bore. This data includes measurements of temperature, vibration, rotation speed, torque, pressure and mud flows around the drill bit. The sensors include accelerometers and magnetometers from which data is transmitted using mud pulse or electro-magnetic telemetry.

Batteries for very high temperatures and vibrations

On-board battery systems are essential for powering these electronics, as it is impossible to run a power cable down the drill hole. These batteries must operate for sustained periods of 20 hours or more in extreme conditions – from well below 0°C on Arctic oil rigs to very high temperatures of +150°C during deep drilling – subject to very high vibrations of 20 g rms and shock levels of 3,000 g. They must perform safely in potentially inflammable and explosive environments.

MWD is a particularly demanding area where Saft’s experience and battery performance (small VL, LSH) prove its worth time and again. Each time a drill assembly has to be brought to the surface, the cost to the exploration company runs into tens of thousands of dollars. Saft’s task is to ensure that it is never a battery problem that forces this downtime or expense.