Guidelineless reentry system with retracting rollers

Patent · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6890320

Brammer, N; Jennings, C E

This patent describes an apparatus for connecting a riser extending from a floating vessel to a subsea well assembly of the type having an upward extending tubular mandrel with a plurality of grooves on its exterior. It comprises: a guide frame mounted to the mandrel a selected distance below the top of the mandrel; an annular hydraulic manifold mounted to the mandrel above the guide frame and below the top of the mandrel, having a plurality of hydraulic passages for communicating hydraulic fluid delivered from the floating vessel to equipment on the subsea well; a mandrel connector mounted to the lower end of the riser for landing on the top of the mandrel to communicate the interior of the mandrel with the interior of the riser; a plurality of dogs carried by the mandrel connector for radial movement between an outer retracted position and an inner locked position in engagement with the grooves on the mandrel; cam means; an annular hydraulic manifold connector; a downward facing guide funnel carried by the riser for insertion over the mandrel into engagement with the guide frame; roller means; for preventing upward movement of the funnel and for allowing rolling engagement of the funnel; and means operatively connected between the mandrel connector and funnel for moving the funnel from a lower extended position relative to the riser and mandrel connector as the funnel is being lowered into engagement with the guide frame to an upper retracted position once the funnel has landed on the guide frame.

• Assignee: Vetco Gray Inc., Houston, TX
• Patent Number(s): A; US 4893677
• Application Number: PPN: US 7-278898A
• OSTI ID: 6890320
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
DESIGN
EQUIPMENT
FABRICATION
FLUIDS
HYDRAULIC FLUIDS
JOINING
MARINE RISERS
MATERIALS HANDLING EQUIPMENT
NATURAL GAS WELLS
OFFSHORE PLATFORMS
PIPES
SHIPS
WELLS
WORKING FLUIDS