STEERABLE DRILLING SYSTEM

摘要

A steerable drilling system comprises a bias unit 10, the bias unit 10 having at least one actuator 14 operable by pressurised drilling fluid or mud, in use, and a separator 20 arranged to remove particulate matter from the supply of pressurised drilling fluid or mud to the or each actuator 14, the separator 20 comprising a hydrocyclone 20.