Whipstock mill

US6056056A · kind A · utility

Inventors

• Douglas Glenn Durst · Katy, US
• Robert E. Robertson · Tomball, US
• Thurman B. Carter · Spring, US
• Paul J. Johantges · Bergmolen, US
• Charles W. Pleasants · Carrollton, US
• William A. Blizzard, Jr. · Houston, US
• Dale Langford · Lafayette, US
• Guy L. McClung, III · Spring, US

Key dates

• Filing date: Jan 18, 1998
• Grant date: May 2, 2000
• Expiry date: Jan 18, 2018

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B29/00
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

Wellbore apparatus has been invented that includes a whipstock with a top and a bottom, the whipstock disposed in a wellbore extending down from an earth surface into the earth, the wellbore having an inner surface, a mill guide with a body having an upper end, a lower end, and a channel therethrough from the upper end to the lower end, and a portion of the lower end of the mill guide disposed between and held between the inner surface of the wellbore and an outer surface of the top of the whipstock. A method for stabilizing a mill guide in a wellbore extending from an earth surface into the earth has been invented, the wellbore having an inner surface, the method including setting a whipstock at a location in the wellbore, the whipstock having a top and a bottom, moving a mill guide down into the wellbore to contact the whipstock, the mill guide having a body with an upper end, a lower end, and a channel therethrough from the upper end to the lower end, and positioning the mill guide so that a portion of the lower end of the mill guide is stabilizinglyconnected to and/or received and held between the inner surface of the wellbore and an outer surface of the top of the whipstock. A…