Method for circulating and maintaining drilling mud in a wellbor

Details Method for circulating and maintaining drilling mud in a wellbor Method for circulating and maintaining drilling mud in a wellbor

1985-12-05

1987-03-31

Novosad, Stephen J.

Boring or penetrating the earth

Automatic control

Of fluid pressure below ground

175 38, 175 48, E21B 2108

Patent

active

046535977

ABSTRACT:
A method for circulating and maintaining a drilling mud in a wellbore drilled into a subterranean formation at a desired pressure during drilling operations, said method consisting essentially of;

REFERENCES:
patent: 4165903 (1979-08-01), Cobbs
patent: 4458945 (1984-07-01), Ayler et al.
patent: 4534427 (1985-08-01), Wang et al.
patent: 4535851 (1985-08-01), Kirkpatrick et al.

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