| 摘要 |
A window milling device which parameters can be set, prior to running inside a casing, and once positioned at a proper location can assure accurate and constant milling parameters, independently from hole configuration and geometry. The assembly consists of an anchoring device, to which a whipstock is connected, and a milling bit attached to a motor, contained within a motor housing. The whipstock has a predetermined groove, and the motor housing is fitted with a mating key having a complimentary profile to the groove. Thus, when the mating key engages the groove, the motor housing travels down the whipstock to a predetermined location, where the milling of the wellbore casing commences.
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