Mobil Oil Corporation

Charles E Jones

Thomas B Dellinger

Eugene A Hoppe

Directional drilling of a high-angle wellbore is carried out by the drilling of a vertical first portion to a kick-off point at which a high-angle, deviated second portion is initiated. The wellbore is cased to at least below the kick-off point. A casing liner is lowered through the wellbore so that it extends coextensively with the casing. The liner is spaced from the casing by a casing hanger positioned above the kick-off point. The liner is sealed in the casing and prevented from rotating during drilling by a packer bore receptacle positioned between the lower end of the liner and the casing. During the drilling of the deviated second portion of the wellbore, the casing liner protects the casing from wear due to the rotation of the drill string as it lies on the lower side of the high-angle wellbore.

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Houston, TX, United States of America

Charles E Jones