Wells – With below and above ground modification – Eduction pump or plunger in well
Patent
1976-03-15
1978-07-11
Purser, Ernest R.
Wells
With below and above ground modification
Eduction pump or plunger in well
61 86, 138106, E21B 712
Patent
active
040995607
ABSTRACT:
A marine riser, which is hung from a drilling platform floating on a body of water and connected at its lower end to a wellhead, is buoyantly tensioned by one or more float cans with open bottoms. These float cans are connected at their upper end to the riser to which air under pressure is controllably supplied. The pressurized air blows out the water in each can to achieve the desired buoyancy. The float can may having an air dump valve interconnected with similar valves in the other cans. The function of these valves is to release the pressurized air in the can if the riser parts. At the upper end of the riser is a slip joint, which may include safety water-dampening gear to further reduce upward motion of a parted riser. The optional dampening gear comprises an annular piston formed by the upper section of the slip joint that forces water through ports in the exterior of the lower section of the slip joint as the riser below the slip joint moves upward. A method of running this riser includes the steps of lowering the riser with or without: the air under pressure flowing into the float cans, a ballast weight at the bottom end of the riser, and supplementary tensioning or motion compensating equipment. The riser's descent may be stopped at a point above a water bottom connector at which time motion compensating equipment may be engaged and then gradually lowered to make the connection. The foregoing is reversed when removing the riser from the water bottom connection.
REFERENCES:
patent: 2684575 (1954-07-01), Pryor et al.
patent: 3017934 (1962-01-01), Rhodes et al.
patent: 3256936 (1966-06-01), Johnson et al.
patent: 3265130 (1966-08-01), Watkins
patent: 3313345 (1967-04-01), Fischer
patent: 3313347 (1967-04-01), Crain
patent: 3359741 (1967-12-01), Nelson
patent: 3456745 (1969-07-01), Peri
patent: 3556231 (1971-01-01), Henderson
patent: 3855656 (1974-12-01), Blenkarn
patent: 3858401 (1975-01-01), Watkins
Fischer William
Rogge Virgil D.
Chevron Research Company
Favreau Richard E.
Freeland, Jr. R. L.
Keeling Edward J.
Purser Ernest R.
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