Air injection sub

Details Air injection sub Air injection sub

1977-07-28

1979-10-16

Purser, Ernest R.

Pumps

One fluid pumped by contact or entrainment with another

Jet

175213, 175215, 417108, 175324, F04F 546, E21B 2100

Patent

active

041711874

ABSTRACT:
An air injection sub for use with a dual conduit drill pipe string is provided having inner and outer concentric tubular members which are connected to the corresponding inner and outer conduits of a dual conduit string to provide isolated annular and central passageways and is particularly characterized by improved injection means in the inner tubular member which allows fluid to pass from the annular passageway into the central passageway through a plurality of apertures which open into the central passageway at a plurality of levels and angular positions, is field adjustable and provides improved erosion resistance.

REFERENCES:
patent: 302182 (1884-07-01), Zotoff
patent: 1071199 (1913-08-01), Andrews
patent: 1209505 (1916-12-01), Sinclair
patent: 3672790 (1972-06-01), White et al.
patent: 3795283 (1974-03-01), Oughton
patent: 3807514 (1974-04-01), Murrell
patent: 3978923 (1976-09-01), Ford

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