Split wear bushing for a drilling rig

Details Split wear bushing for a drilling rig Split wear bushing for a drilling rig

1991-12-30

1993-04-06

Dang, Hoang C.

Wells

Submerged well

Connection or disconnection of submerged members remotely...

166 85, 166340, 166379, 175 5, 175 7, E21B 712, E21B 1710

Patent

active

051994950

ABSTRACT:
A split wear bushing for a subsea well assembly provides a standoff for the drill pipe to avoid damage to the casing near where it secures to the casing hanger. The split wear bushing has an outer wear bushing that locks into the casing hanger. An inner wear bushing lands in the bore of the outer wear bushing. The inner wear bushing has an inner diameter that is smaller than the inner diameter of the casing to provide a standoff. The inner wear bushing is carried on a wear bushing sub. An engaging shoulder on the wear bushing sub contacts the inner wear bushing during each trip of the drill string to pull the inner wear bushing from the outer wear bushing. The inner wear bushing relocks to the outer wear bushing on the return trip. A retrieval lock enables the outer wear bushing to be retrieved along with the inner wear bushing for the final trip.

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