Dril-quip, Inc.

Gerald W Crotwell

Bruce J Watkins

Apparatus for use in the completion and workover of a subsea well adapted for coil tubing intervention comprises a surface tree having an upper end on which a coil tubing injection unit may be mounted, a tension joint adapted to be connected to the upper end of a lower riser section extending to a subsea tree and to be suspended from a tensioning system at the surface to enable the lower riser section to be maintained in tension, an upper riser section for connection at its upper end to the surface tree and at its lower end to the tension joint, and a surface joint mounted on and surrounding the riser section in position to extend through the spider at the floor of an offshore rig. The upper riser section includes an upper portion having an upper connector intermediate the surface tree and surface joint and a lower portion having a lower connector intermediate the surface joint and tension joint, and an upper sleeve is supported by the surface joint for shifting between a lower position in which access may be had to the upper connector and an upper position extending between the surface joint and surface tree to surround the upper riser portion, and a lower sleeve is supported by the surface joint for shifting between a lower position in which access may be had to the lower riser connector and an upper position extending between the surface joint and tension joint to surround the lower riser portion.

Apparatus for use in the completion of subsea wells

There is disclosed well apparatus wherein a so-called 'backout sub' connected by right-hand threads at its lower end to a lower well pipe has both left-hand threads thereabout for connection with left-hand threads on the lower end of one upper tubular member to permit it to be released and raised from the lower tubular member, in response to right hand rotation of the upper tubular member, and right-hand threads for connection with right-hand threads on the lower end of another upper tubular member for use in tying the lower tubular member and thus the lower well pipe back to the head of the well in response to right-hand rotation.

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Sugarland, TX, United States of America

Gerald W Crotwell