Retrievable whipstock system

A whipstock assembly is provided for lowering within a cased wellbore, cutting a window through a casing for drilling a sidetrack borehole, and retrieving with conventional fishing tools. The whipstock assembly includes two separate whipstocks having different tapers, and which are releasibly couple...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: LYNDE, GERALD D, LEE, MARK H, SELF, ANTHONY D
Format: Patent
Sprache:eng
Schlagworte:
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Beschreibung
Zusammenfassung:A whipstock assembly is provided for lowering within a cased wellbore, cutting a window through a casing for drilling a sidetrack borehole, and retrieving with conventional fishing tools. The whipstock assembly includes two separate whipstocks having different tapers, and which are releasibly coupled for separately retrieving from the cased wellbore. A barrier member is provided to prevent a tapered face of one of the whipstocks from wedging debris between the whipstock and the casing.