ARRANGEMENT TO CUT WINDOWS IN OIL STRING Russian patent published in 2002 - IPC

Abstract RU 2180388 C2

FIELD: drilling of wells. SUBSTANCE: invention is intended to return to service off-stream or low discharge wells by method of drilling of additional shafts from oil strings. Characteristic feature of invention lies in manufacture of gear for attachment of starting milling cutter on wedge-deflecting tool in the form of release located in holes of starting milling cutter and guiding stopper of chute of wedge-deflecting tool. Pusher of anchor of wedge deflecting tool is positioned inside case of the latter and has conical surfaces for interaction with extending dies. Rod of pusher can rest against face in this case. EFFECT: fast and reliable release of starting milling cutter from wedge-deflecting tool. 1 dwg

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RU 2 180 388 C2

Authors

Mazein V.E.

Azanov E.A.

Gur'Janov E.V.

Dates

2002-03-10—Published

1999-10-22—Filed