Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent
1989-12-04
1991-01-22
Dang, Hoang C.
Boring or penetrating the earth
With tool shaft detail
Helix or helically arranged structure
175325, 175394, 175401, E21B 1722, E21B 1200
Patent
active
049863754
ABSTRACT:
A device for facilitating the retrieval of a drill bit from a crooked hole, a soft rock or a broken rock formation is disclosed. The device is secured to a drill string at one end and to a drill bit an an opposite end. The device includes a cylindrical member having a helical member of gradually increasing radial thickness secured about its periphery. The helical member has a plurality of hardened cutter members secured to and projecting from its periphery. The radial thickness of the helical member is greatest at that section of the device closest to the drill bit and least at that section of the device closest to the drill string. The device clears obstructions in the bore hole above the drill bit to ease the removal of the bit from the hole, while at the same time, the device avoids enlarging the bore hole on either the advancing or retrieving trip of the drill string. The device further serves to maintain alignment of the drill string during advancement into and retrieval from the bore hole.
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patent: 4385669 (1983-05-01), Knutsen
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Dang Hoang C.
Poff Clifford A.
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