Boring or penetrating the earth – Processes – Boring horizontal bores
Patent
1996-02-20
1997-11-18
Bagnell, David J.
Boring or penetrating the earth
Processes
Boring horizontal bores
175 78, 175 81, E21B 416, E21B 708, E21B 1720
Patent
active
056878060
ABSTRACT:
An apparatus and method are disclosed for applying thrust (weight on bit) to a drill bit when drilling with a flexible drilling shaft while creating perforations in a cased well. The thrust is applied directly to the drill bit instead of applying it to the drill bit through the flexible drilling shaft. A support bracket is also in contact with a piston and is in slidable contact with the tool housing. A portion of the piston is positioned inside a chamber in the housing and is slidably attached to the chamber walls. As hydraulic fluid flows into the chamber opposite the piston, the piston is forced toward the drill bit. As the piston moves toward the drill bit, force is exerted on the support bracket which causes the bracket to move toward the drill bit. This force is transferred to the drill bit during the drilling process, thereby supplying the force (weight on bit) needed by the drill bit to effectively drill through a desired material.
REFERENCES:
patent: 2516421 (1950-07-01), Robertson
patent: 4062412 (1977-12-01), McIlvanie
patent: 4658916 (1987-04-01), Bond
patent: 5195588 (1993-03-01), Dave
"Longer-Than-Seam-Height Drill Development Program", Derby et al, United States Department of the Interior Bureau of Mines, 1978.
Flores Mario
Havlinek Kenneth
Hinton Mark L.
Jaroska Miles
LaDue Duane
Bagnell David J.
Gas Research Institute
Jeffery Brigitte L.
Ryberg John J.
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