Wells – Processes – Destroying or dissolving well part
Patent
1993-10-07
1995-04-18
Britts, Ramon S.
Wells
Processes
Destroying or dissolving well part
1753253, 175326, E21B 2900
Patent
active
054070112
ABSTRACT:
A mill assembly having a mill face for milling material in a downhole milling operation is received in a casing or well bore having an internal wall having a first diameter. The mill face has a smaller diameter than the first diameter. The mill face is connected to a shaft assembly including a shaft and a stabilizing assembly for stabilizing the shaft in the casing or the well bore. The stabilizing assembly is connected at one end to the mill face and has a smaller diameter than the first diameter. The stabilizing assembly includes a stem having one or more tapered surfaces, the tapered surfaces tapering from a first diameter to a second diameter larger than the first diameter. The stabilizing assembly further includes a plurality of roller bearings circumferentially arranged in a plane around the stem, each roller bearing being in contact with one of the tapered surfaces at a first point. One of the roller bearings and the stem are moved so that each of the plurality of roller bearings contacts the tapered surface at a second point closer to the second diameter than the first point and is thereby brought into contact with the internal wall of the casing to stabilize the shaft. A method of milling is also described.
REFERENCES:
patent: 1877395 (1932-09-01), Goeser
patent: 1890530 (1932-12-01), Santiago
patent: 1913365 (1933-06-01), Bailey
patent: 2167194 (1939-07-01), Anderson
patent: 3413045 (1968-11-01), Wohlfeld
Britts Ramon S.
Tsay Frank S.
Wada Ventures
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