Extension drilling system

Details Extension drilling system Extension drilling system

1998-06-11

2000-11-14

Neuder, William

Boring or penetrating the earth

With means movable relative to tool below ground to stop...

With longitudinally spaced valve seats

175320, E21B 1700

Patent

active

061456039

ABSTRACT:
An extension drilling system for use with a semiautomatic drilling rig. The drilling system includes a plurality of extension rods constituting a drill rod string and having cooperating male and female threaded couplings therebetween, and being right-hand rope threaded couplings. A reversible drive chuck of a drilling rig drives (either directly, or via an adaptor), the outside of the female threaded end of an associated extension rod. A gripper grips one of the extension rods to hold the drill rod string stationary when the chuck is driven in reverse. The gripper is located such that only one threaded coupling is disposed between the chuck and grippers and to ensure that when the chuck is rotated in reverse, only the desired coupling is uncoupled. The drill rods have axial passages therethrough in communication with each other and through which flushing fluid is delivered to an associated drill bit and a non-return valve is incorporated in the passage through at least one of the drill rods. A socket of the drive chuck (or adaptor) is configured to automatically lock the drill rod in the socket in response to rotation of the drive chuck.

REFERENCES:
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patent: 3096825 (1963-07-01), Clark, Jr.
patent: 3166132 (1965-01-01), Lenahan et al.
patent: 4702328 (1987-10-01), McSweeney et al.
patent: 4773490 (1988-09-01), McSweeney et al.
patent: 4834594 (1989-05-01), Morgan
patent: 4907660 (1990-03-01), Staggs et al.
patent: 5568839 (1996-10-01), Campbell

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