Artificial lift system for marine drilling riser

Details Artificial lift system for marine drilling riser Artificial lift system for marine drilling riser

1977-04-11

1978-05-30

Purser, Ernest R.

Boring or penetrating the earth

Boring a submerged formation

Boring from floating support with submerged independent...

175 72, 175 25, 175 48, E21B 1502

Patent

active

040918815

ABSTRACT:
An improved offshore drilling method and apparatus are disclosed which are particularly useful in preventing formation fracture caused by excessive hydrostatic pressure of the drilling fluid in a drilling riser. One or more flow lines are used to withdraw drilling fluid from the upper portion of the riser pipe. Gas injected into the flow lines substantially reduces the density of the drilling fluid and provides the lift necessary to return the drilling fluid to the surface. The rate of gas injection and drilling fluid withdrawal can be controlled to maintain the hydrostatic pressure of the drilling fluid remaining in the riser and wellbore below the fracture pressure of the formation.

REFERENCES:
patent: 2923531 (1960-02-01), Bauer et al.
patent: 3603409 (1971-09-01), Watkins
patent: 3809170 (1974-05-01), Ilfrey
patent: 3815673 (1974-06-01), Bruce et al.

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