Air and mud control system for underbalanced drilling

Details Air and mud control system for underbalanced drilling Air and mud control system for underbalanced drilling

1997-05-27

1999-02-23

Neuder, William

Boring or penetrating the earth

Automatic control

Of fluid pressure below ground

175 69, E21B 2100

Patent

active

058734201

ABSTRACT:
A method and apparatus for drilling a well is set forth. In one aspect, a typical drill stem is assembled from a set of drill pipe and delivers a flow of drilling mud to the drill bit. A smaller tubing string is placed on the interior and connects to a mixing valve just above the drill bit. A gas flow is placed in the tubing which flows to the mixing valve where the gas is mixed in a desired ratio with the drilling mud so the mud weight is reduced, and thereby enables drilling, at a faster rate with an underbalanced condition. Steps are set forth in which the pressure is changed to an overbalanced condition.

REFERENCES:
patent: 1346939 (1920-07-01), Carmichael
patent: 2726063 (1955-12-01), Ragland et al.
patent: 3497020 (1970-02-01), Kammerer, Jr.
patent: 3534822 (1970-10-01), Campbell et al.
patent: 3827511 (1974-08-01), Jones

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