Pressure-compensated dual marine riser

Details Pressure-compensated dual marine riser Pressure-compensated dual marine riser

1976-10-18

1977-11-22

Purser, Ernest R.

Wells

With below and above ground modification

Eduction pump or plunger in well

175 27, 175 7, 166208, E21B 712

Patent

active

040591484

ABSTRACT:
A dual marine riser for use in drilling deepwater oil and gas wells from a floating vessel, the marine riser incorporating concentric inner and outer risers, the outer riser being provided with one or more remotely-actuatable valves adapted to bring the annular space between the risers into communication with surrounding sea water in order to equalize pressures over the wall of the outer riser when the inner riser has been installed.

REFERENCES:
patent: 2607422 (1952-08-01), Parks et al.
patent: 3055429 (1962-09-01), Tausch et al.
patent: 3137348 (1964-06-01), Ahlstone et al.
patent: 3259198 (1966-07-01), Montgomery et al.
patent: 3310107 (1967-03-01), Yancey
patent: 3486555 (1969-12-01), Vincent
patent: 3572014 (1971-03-01), Graaf
patent: 3721292 (1973-03-01), Ahlstone

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