Wells – Submerged well – Means removably connected to permanent well structure
Patent
1998-08-06
2000-08-15
Suchfield, George
Wells
Submerged well
Means removably connected to permanent well structure
1662422, 1662423, 166363, 166367, 166384, 4051951, E21B 33035, E21B 43013
Patent
active
061021253
ABSTRACT:
An apparatus for performing workover operations on a subsea well that has a subsea production tree with a production passage and an annulus access passageway. The subsea production tree is secured to a lower riser portion. The lower riser portion connects to the tree and has a production passage which registers with a production passage of the tree. The apparatus also has an annulus access passage which registers with the annulus access passage of the tree. The apparatus further includes a monobore riser which extends downward from the surface. A string of tubing, preferably coiled tubing, extends through the monobore riser and defines an inner riser passage and an annular riser passage. A circulation plug is secured proximate a lower end of the coiled tubing and is landed in the lower riser portion of the subsea well. The circulation plug communicates the inner riser passage with the annulus access passage. A flow-by passage is provided in the circulation plug to communicate the production passage with the annular riser passage.
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ABB Vetco Gray Inc.
Bradley James E.
Suchfield George
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