Annulus bypass peripheral nozzle jet pump pressure differential

Details Annulus bypass peripheral nozzle jet pump pressure differential Annulus bypass peripheral nozzle jet pump pressure differential

1984-12-26

1986-12-23

Novosad, Stephen J.

Boring or penetrating the earth

Processes

Boring with specific fluid

175213, 175325, 166187, E21B 700

Patent

active

046306919

ABSTRACT:
A pressure differential drilling tool and method of underbalanced pressure controlled well bore drilling, characterized by a modulating plug closely expanded to the well bore diameter to form an annulus for external bypass of well fluid immediately above the drill bit and through which the drill string continuously makes hole, and by an upwardly disposed peripheral nozzle jet pump with controlled suction of fluid from the bit so as to establish a reduced and/or underbalanced fluid pressure condition at the bit-to-bore bottom interface for operating the drill bit at an increased rate of penetration while maintaining a higher pressure condition in the well bore annulus above the modulating plug controllably expanded by hydraulic pressure applied to operate the jet pump.

REFERENCES:
patent: 2643722 (1953-06-01), Lynes et al.
patent: 2946565 (1960-07-01), Williams
patent: 3529667 (1970-09-01), Malone
patent: 3542127 (1970-11-01), Malone
patent: 3604732 (1971-09-01), Malone
patent: 4223747 (1980-09-01), Marais
patent: 4534426 (1985-08-01), Hooper

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