Patent Number: 6,332,498

Title: Deviated borehole drilling assembly

Abstract: An assembly for formation and completion of deviated wellbores is disclosed which includes a toolguide and a casing section which can be used together or separately. The toolguide includes a lower orienting section and a whipstock having a sloping face, commonly known as the directional portion of a whipstock. The toolguide is coated with a material such as epoxy or polyurethane to provide a repairable surface and one which can be removed to facilitate removal of the toolguide from the well bore. The lower orienting section has a latch which extends radially outwardly from the section and can be locked in the outwardly biased position. The casing section of the present invention includes a sleeve which can be moved between a first position in which access to the window opening of casing section is not affected and a second position in which the main casing is sealed from the liner section of a deviated wellbore to provide a hydraulic seal against passage of fluids from outside the casing of the wellbore into the main casing.

Inventors: George; Grand E. E. (Edmonton, CA)

Assignee: Schlumberger Technology Corp.

International Classification: E21B 23/04 (20060101); E21B 7/06 (20060101); E21B 23/02 (20060101); E21B 23/00 (20060101); E21B 34/00 (20060101); E21B 7/04 (20060101); E21B 23/12 (20060101); E21B 47/00 (20060101); E21B 41/00 (20060101); E21B 43/02 (20060101); E21B 43/10 (20060101); E21B 34/14 (20060101); E21B 47/09 (20060101); E21B 017/00 (); E21B 043/14 (); E21B 034/14 ()

Expiration Date: 12/25/2018