Non-magnetic downhole motor is a kind of specially designed small size downhole motor. The cross-over sub, power section are all made of non-magnetic material which is usually beryllium bronze. Specially designed material makes the downhole motor is allowed to work with the measuring instrument directly without any connection sub and this also shortens the distance from measuring point to the bit making the measurement more accurate. And beryllium bronze is a very good anti-explosive material which allows the motors works in coal mine directly without any safety crisis.
