Boring or penetrating the earth – With means movable relative to tool to receive – retain – or... – Core-retaining or severing means
Patent
1988-01-25
1989-10-24
Novosad, Stephen J.
Boring or penetrating the earth
With means movable relative to tool to receive, retain, or...
Core-retaining or severing means
175107, E21B 2502
Patent
active
048755311
ABSTRACT:
A core drilling tool with direct drive consisting of an outer pipe that can be connected to a drilling shaft, a core drilling appliance reciprocally mountable in the outer pipe which in turn includes a core barrel that carries a drill bit and an inner pipe mounted in rotatable relation therewith and for reciprocal movement therewith, and a drilling mud driven motor that is integrally coupled to the core drilling appliance and is secured against rotation in the outer pipe and having reaction faces that are put under pressure to produce a downward axial feed force acting on both the core drilling appliance and the motor, plus a capture device for pulling up the motor together with the core drilling appliance. In order to produce a sufficiently great axial feed force of an adjustable size that is essentially independent of the exposure of the core drilling appliance, the motor is connected to the core drilling appliance to form a common movable unit and devices are provided for adjusting the axial feed force.
REFERENCES:
patent: 2898086 (1959-08-01), Freeman, Jr. et al.
patent: 2915285 (1959-12-01), Deily
patent: 4518050 (1985-05-01), Sollie et al.
patent: 4518051 (1985-05-01), Sollie et al.
Biehl Johann
Ostertag Alfred
Bagnell David J.
Eastman Christensen Company
Novosad Stephen J.
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