steerable sleeve

When the automatic anti-deviation drilling system is in operation ,a relative rotate speed is needed between the steerable sleeve and the drill string to produce essential anti-deviation powers.
自動垂直鑽井系統(tǒng)在工作中,由於糾斜動力的需要,導曏活套與鑽桿需要保持一個相對轉(zhuǎn)速。