초록 ▼

There are disclosed two embodiments of a subsea drilling, completion and/or workover apparatus which includes a spar buoy having a well therethrough, and a riser which extends through the well in the buoy for connection to the subsea wellhead during the drilling and/or completion process. A buoyancy

There are disclosed two embodiments of a subsea drilling, completion and/or workover apparatus which includes a spar buoy having a well therethrough, and a riser which extends through the well in the buoy for connection to the subsea wellhead during the drilling and/or completion process. A buoyancy tank is disposed about the riser within the buoy well to support the riser, and the upper end of the tank is fee to move vertically with respect to the well deck so that it will not be placed in compression despite anticipated rise and fall of the buoyancy tank.

대표청구항 ▼

[ What is claimed is:] [9.]9. For use in drilling, completing and/or working over of a subsea well from a spar buoy having a well to receive a surface wellhead, an assembly comprising:a riser pipe whose upper end is adapted to extend through the well to connect the surface wellhead to a subsurface w

[ What is claimed is:] [9.]9. For use in drilling, completing and/or working over of a subsea well from a spar buoy having a well to receive a surface wellhead, an assembly comprising:a riser pipe whose upper end is adapted to extend through the well to connect the surface wellhead to a subsurface wellhead, anda buoyancy tank disposed about the riser within the well and having an upwardly facing shoulder at its inner wall for supporting a downwardly facing shoulder on the riser pipe when so disposed.