Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Patent
1990-09-20
1991-10-29
Dang, Hoang C.
Boring or penetrating the earth
Cutter element laterally shiftable below ground
Cutter element shifted by fluid pressure
166 558, 175286, 175406, E21D 1032
Patent
active
050607383
ABSTRACT:
An underreamer tool has a generally cylindrical body with a threaded top end for connection to a tubing string, a threaded lower portion to receive a drill bit, and a longitudinal fluid passageway extending centrally through the body. The body has three flat surfaces formed on its exterior in circumferentially spaced relation to define a generally triangular cross section intermediate the top and bottom ends of the body. A cutter blade is pivotally mounted on each of the flat surfaces. A piston is slidably received in a bore in the upper portion of the body and has central fluid passageway therethrough. Push rod members are connected to the piston inside the body and each has an exterior portion slidably mounted in a slot on the exterior of the body engaging the cutter blades for moving them between a retracted position against the body and an extended position outward therefrom. The piston and push rod members are moveable between an upper position allowing the blades to assume the retracted position and a lower position moving the cutter blades to the extended position responsive to a predetermined fluid pressure acting thereon. A continuous fluid flow path is established from the upper end of the tool to the drill bit at the lower end of the tool regardless of the position of the piston.
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Fultz Jimmy D.
Pittard Fred J.
Dang Hoang C.
Mosely Neal J.
Slimdril International Inc.
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