Drilling fluid bypass for marine riser

Details Drilling fluid bypass for marine riser Drilling fluid bypass for marine riser

1980-03-25

1981-09-29

Novosad, Stephen J.

Boring or penetrating the earth

Boring a submerged formation

175 7, 175 38, 175 40, 175 25, E21B 712, E21B 1701, E21B 2108

Patent

active

042917727

ABSTRACT:
Method and apparatus are described to reduce the tension required on a riser pipe used in offshore drilling between a floating vessel and a subsea wellhead. Heavy drilling fluid is circulated down a drill pipe and up the annulus between the drill pipe and the borehole wall to a point just above a subsea wellhead. From this point, a separate drilling fluid return conduit extends to the floating vessel. Means are provided to maintain a constant level of an interface between the heavy returning drilling fluid and the lightweight fluid which can be confined within the riser pipe.

REFERENCES:
patent: 3465817 (1969-09-01), Vincent
patent: 3601187 (1971-08-01), Tidwell
patent: 3791442 (1974-02-01), Watkins
patent: 3815673 (1974-06-01), Bruce et al.
patent: 3825065 (1974-07-01), Lloyd et al.
patent: 4063602 (1977-12-01), Howell et al.
patent: 4091881 (1978-05-01), Maus
patent: 4099583 (1978-07-01), Maus
patent: 4149603 (1979-04-01), Arnold

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