Abb Vetco Gray Incorporated

Vetco Gray Inc.

Garry R Stephen

Norman Brammer

Stephen A Cromar

Eric R Schwelm

Lawrence A Eckert

Ian D Calder

Dale B Marietta

Allan C Sharp

Casimir J Fritshe

A well completion system utilizes a seal which carries its own load ring. The seal is lowered into the bore of a wellhead housing around a tubular member. The seal carries a split load ring, which once positioned will move outward into engagement with a groove formed in the wellhead housing. A locking assembly will lock the seal to the wellhead housing. The locking assembly has a casing lock ring which will secure to the upper end of a section of casing, if the casing has been cut due to an emergency stuck condition. A tubing hanger lands over the locking assembly. The tubing hanger is retained by an actuating ring and lock ring that are independent of the tubing hanger seal.

Wellhead completion system

A wellhead housing a supports a string of casing in tension by using a load ring. The load ring mounts to the exterior of a casing hanger which secures to the upper end of the string of casing. The load ring is split, resilient and outwardly biased. The load ring is retained during the running of the casing. The running tool then releases the load ring to spring outward to support the load. The load ring has wickers on its exterior that mate with wickers in the interior of the bore.

Casing tension retainer

An emergency casing support utilizes a conventional casing hanger. Casing hanger lands on a wellhead housing internal landing shoulder. The emergency support secures to the lower end of the casing hanger. The emergency support has a body which carries a slips bowl. Body also carries a seal for sealing between the casing and the body. A sleeve nut is engaged by a setting tool lowered through the casing hanger into the body. The sleeve nut when rotated causes the bowl to move upward relative to the slips and also energizes the seal.

Emergency casing support using standard casing hanger

A mechanism mounts to a casing hanger for supporting the casing in tension. The mechanism includes a plurality of dogs mounted around the exterior of the casing hanger. Each of the dogs has wickers on its exterior which engage wickers formed in the bore of a wellhead housing. The dogs are carried within a recess. The recess has upper and lower parallel conical shoulders. A sleeve retains the dogs in a retracted position until tension has been applied. The sleeve releases the dogs by rotational movement of the running tool which runs the casing hanger.

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Aberdeen, United Kingdom

Garry R Stephen