Boring or penetrating the earth – Processes – Boring horizontal bores
Patent
1992-05-15
1993-11-30
Britts, Ramon S.
Boring or penetrating the earth
Processes
Boring horizontal bores
175 73, E21B 708
Patent
active
052656870
ABSTRACT:
A supplemental horizontal section is drilled from a lower end of an existing well bore by a drilling tool which provides a short radius of the order of 20 feet of a curved section interconnecting the vertical initial section and the horizontal section. This enables the drilling to take place without expensive monitoring equipment since the distances involved are relatively small. The drilling tool includes a mud motor to which is attached a drilling section including a drill bit at the outer end thereof. The drilling section is connected to the mud motor by a knuckle joint which allows pivotal action about an axis at right angles to the longitudinal axis of the drill bit. A counterbore of increased diameter is formed at the lower end of the existing well bore and the knuckle and drill bit located therein. The knuckle is biased toward one side of the counter bore by a leaf spring so that the longitudinal axis of the drill bit takes up an inclined position with a knuckle bent at a shallow angle. As the drill bit forms a supplemental bore to one side of the main bore the knuckle pivots to gradually increase the angle up to a maximum angle at which the drill bit cuts a curved path. The diameter of the drill bit is selected so that the motor and drill bit section can pass through the curved section to the horizontal section.
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Adew Stanley G.
Battison Adrian D.
Britts Ramon S.
Kidco Resources Ltd.
Thrift Murray E.
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