Wells – Submerged well – Means removably connected to permanent well structure
Patent
1983-10-13
1985-04-23
Novosad, Stephen J.
Wells
Submerged well
Means removably connected to permanent well structure
175 10, 414745, 166349, E21B 1502, E21B 4104
Patent
active
045124094
ABSTRACT:
A guidance system for centering and guiding various drill strings or risers within a moonpool of a floating structure, e.g. a caisson vessel. The system comprises one or more guidance vehicles. Each vehicle is movably mounted on a separate track. The tracks, in turn, are spaced about the moonpool wall and extend vertically along the wall of the moonpool from the top of the moonpool to a point near its bottom. Each vehicle has a frame and means to mount the frame on its respective track. Two side arms and a center arm are pivotably mounted on the frame and are movable between a closed position and an open position. Mounted at the outer end of each of the arms is an interchangeable workhead assembly which engages a drill string or riser to center and guide the drill string or riser when the arms are in their closed position. Individual lines controlled by winches above the moonpool are attached to each vehicle for independently raising and lowering that vehicle within the moonpool.
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Danielson Thomas R.
Eberwine Donald A.
Gregory Edward W.
Delflache Marc L.
Exxon Production Research Co.
Kisliuk Bruce M.
Lukin Mitchell D.
Novosad Stephen J.
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