Wells – Submerged well – Means removably connected to permanent well structure
Patent
1998-12-10
2000-10-10
Taylor, Dennis L.
Wells
Submerged well
Means removably connected to permanent well structure
166350, 4051951, E21B 712, E02B 1138
Patent
active
06129151&
ABSTRACT:
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.
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API Recommended Practice For Design And Operation of Completion/Workover Riser Systems, API RP 17G, 42 pages, Oct. 7, 1993.
Ian Calder, New Concerns In Deepwater and Harsh Environment Coiled Tubing and Workover Riser Operations, ABB Vetco Gray Ltd., 30 pages, Aberdeen, Great Britain.
Dril-Quip Inc.
Taylor Dennis L.
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