Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Patent
1975-10-02
1977-11-08
Novosad, Stephen J.
Boring or penetrating the earth
With above-ground means for handling drilling fluid or cutting
With tool shaft having plural passages for drilling fluid
166152, 166334, 175243, 175317, 175325, E21B 1700, E21B 1704, E21B 2100
Patent
active
040571181
ABSTRACT:
A bit packer for use with a string of dual concentric drill pipe, having inner and outer tubular members concentrically arranged to mate with the inner and outer pipes of the drill string to provide an annular conduit for fluid from surface to bit and a central conduit for fluid and cuttings from bit to surface, is particularly characterized by flexible packing means mounted slidably and rotatably on the outer tubular member. The packing means deform against the hole wall to seal the annular space between the outer member and the hole wall. Upper and lower ports provide fluid communication between the annular conduit and the annular space; when the packer is moved downwardly in the hole the packing means slides upwardly to close the upper port and open the lower port; when the packer is moved upwardly in the hole, the converse occurs. A milling collar is provided above the packing means.
REFERENCES:
patent: 2602516 (1952-07-01), Gray
patent: 2663545 (1953-12-01), Grable
patent: 2882019 (1959-04-01), Carr et al.
patent: 2942667 (1960-06-01), Blood et al.
patent: 3094176 (1963-06-01), Cook
patent: 3151690 (1964-10-01), Grable
patent: 3155179 (1964-11-01), Hunt et al.
patent: 3283835 (1966-11-01), Kellner
patent: 3722608 (1973-03-01), Faulk
patent: 3823788 (1974-07-01), Garrison et al.
Harmon Robert L.
Novosad Stephen J.
Walker-Neer Manufacturing Co. Inc.
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