DEVICE FOR CUTTING OF WINDOW IN CASING Russian patent published in 1999 - IPC

Abstract RU 2140520 C1

FIELD: well drilling. SUBSTANCE: device includes reaming mill with guide mechanism and deflecting wedge installed on hole bottom. Guide mechanism is made in form of two concentric pipes installed for rotation relative to each other. Installed on outer pipe are two retainers which during operation of device enter recess of deflecting wedge and lock the position of reaming mill so that its cutting members do not coming in contact with deflecting wedge. EFFECT: reduced material expenditures and time taken for initiating the second wellbore, increased service life of reaming mill cutting structure. 2 cl, 2 dwg

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RU 2 140 520 C1

Authors

Mikhajlov A.N.

Gajduk N.G.

Kagarmanov N.F.

Shajnurov R.S.

Samigullin V.Kh.

Dates

1999-10-27—Published

1996-11-10—Filed