Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – Fluid or cuttings directing or receiving means engaging bore...
Patent
1989-03-07
1990-08-21
Novosad, Stephen J.
Boring or penetrating the earth
With above-ground means for handling drilling fluid or cutting
Fluid or cuttings directing or receiving means engaging bore...
175214, 166 88, E21B 33068
Patent
active
049497960
ABSTRACT:
There is disclosed an improved drilling head which provides for the formation of a continuous seal about a drilling string, where the drilling string consists of varying diameter drill string components. A stationary bowl configured to pass a drill string is provided with an annular grove about the top so as to allow for the attachment of a connecting clamp. An assembly carrier is provided which is removably disposable within the bowl and to which a lower stripper rubber may be attached. A bearing assembly adapted for placement within the assembly carrier is provided with an upper rotatable stripper rubber of smaller diameter that the lower stripper rubber so as to form a seal on smaller diameter drilling strings.
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Melius Terry Lee
Novosad Stephen J.
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