Gas lift system for marine drilling riser

Details Gas lift system for marine drilling riser Gas lift system for marine drilling riser

1977-04-11

1978-07-11

Purser, Ernest R.

Boring or penetrating the earth

Boring a submerged formation

Boring from floating support with submerged independent...

175 25, 175 69, 175 72, E21B 1502, E21B 718

Patent

active

040995836

ABSTRACT:
An improved offshore drilling method and apparatus are disclosed which are useful in preventing formation fracture caused by excessive hydrostatic pressure in a drilling riser. Gas is injected into the riser to provide the lift necessary to return the drilling fluid to the surface and to reduce the density of the drilling fluid. The rate of gas injection overlifts the drilling fluid to the extent that the pressure of the fluid is reduced to less than that of the seawater surrounding the riser. Seawater is permitted to flow into the lower end of the riser in response to the differential pressure between the drilling fluid and seawater so that the pressures of the drilling fluid and the seawater approximately equalize.

REFERENCES:
patent: 2923531 (1960-02-01), Bauer et al.
patent: 3434550 (1969-03-01), Townsend, Jr.
patent: 3465817 (1969-09-01), Vincent
patent: 3603409 (1971-09-01), Watkins et al.
patent: 3815673 (1974-06-01), Bruce et al.
patent: 3911740 (1975-10-01), Calhoun
patent: 3955411 (1976-05-01), Lawson, Jr.

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