Wells – Means for perforating – weakening – bending or separating pipe... – Cutter rotates circumferentially of pipe
Patent
1994-03-24
1995-07-11
Britts, Ramon S.
Wells
Means for perforating, weakening, bending or separating pipe...
Cutter rotates circumferentially of pipe
1661176, 175 81, 175 82, E21B 708, E21B 2300
Patent
active
054312205
ABSTRACT:
A starter mill adapted for use with a whipstock to mill a window through the casing of a well for deviating the direction of drilling. The starter mill includes a bearing nose which is utilized to indicate completion of the milling process. As the mill nears completion of the milling process, the bearing nose will become wedged between the whipstock face and the casing preventing further downhole movement. The bearing nose will engage whipstock and casing, allowing the work string to continue to rotate although the decreased torque resulting from the absence of milling provides a clear signal that the milling operation is complete. The cutters of the mill are spaced a predetermined distance from the bearing nose to ensure completion of the casing window.
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Bailey Thomas F.
Campbell John E.
Hebert Joseph V.
Lennon W. L.
Britts Ramon S.
Smith International Inc.
Tsay Frank S.
Upton Robert G.
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