Single trip milling tool

Single trip milling tool

A milling tool is provided for use in a single trip into a wellbore to cut a window through a casing wall 4 for passage of a drillstring used to drill a sidetrack borehole. The sidetrack system includes a mill 14 for both starting and cutting the window through the casing, and a whipstock having a d...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: GERALD DAVID LYNDE, MARK HOWARD LEE, KENDALL CRAIG WHITLER, JOHN LINDLEY BAUGH, ANTHONY D SELF, GEORGE J MELENYZER
Format: Patent
Sprache:eng
Schlagworte:
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Beschreibung
Zusammenfassung:A milling tool is provided for use in a single trip into a wellbore to cut a window through a casing wall 4 for passage of a drillstring used to drill a sidetrack borehole. The sidetrack system includes a mill 14 for both starting and cutting the window through the casing, and a whipstock having a deflector surface for directing the mill into the casing to cut the window. The mill 14 has fixed cutters 28 and expandable cutters 26. In use the mill is moved downwards to start cutting the window and the cutters are expanded to enlarge the window. The cutters also ream the window when the mill is withdrawn upwardly from the borehole.