DRILLING APPARATUS USING A SEALED SELF-ADJUSTING DEFLECTION DEVICE FOR DRILLING DIRECTIONAL WELLS

• Main Authors: PETERS, Volker, GRIMMER, Harald, FULDA, Christian, PETER, Andreas, EGGERS, Heiko
• Format: Patent
• Language: English; French; German
• Published: 06.09.2023
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

An apparatus for drilling directional wellbores is disclosed that in one non-limiting embodiment incudes a drive for rotating a drill bit, a deflection device that enables a lower section of a drilling assembly to tilt about a member of the deflection device within a selected plane when the drilling assembly is substantially rotationally stationary to allow drilling of a curved section of the wellbore when the drill bit is rotated by the drive and wherein the tilt is reduced when the drilling assembly is rotated to allow drilling of a straighter section of the wellbore, and at least one seal that isolates at least a surface of the member from outside environment. The at least one seal is lubricated by a sealed hydraulic unit