METHODS AND APPARATUS FOR FORMING A LATERAL WELLBORE

WIPO Patent Application WO2002023008

A3

In one aspect of the invention, a thermite containing apparatus (160) is run into the wellbore (105) on a wire line and a window is subsequently formed in casing wall. In another aspect of the invention, the apparatus includes a run-in string or drill stem (110) with a drill bit (120) attached to a lower end thereof. A diverter (130), like a whipstock is attached temporarily to the drill bit with a mechanically shearable connection (132). At a lower end of the whipstock, a container (160) is formed and connected thereto. A telescopic joint (200) extends between the bottom of the container and an anchor (280) therebelow. The assembly allow to form a window and drill a lateral in a single trip.

HAUGEN DAVID MICHAEL (US)
TILTON FREDERICK THOMAS (US)
GRAY KEVIN LEON (US)
BRUNNERT DAVID (US)
BADRAK ROBERT (US)
SIMPSON NEIL ALEXANDER ABERCRO (GB)

PCT/GB2001/004045

September 19, 2002

September 10, 2001

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WEATHERFORD LAMB (US)
HAUGEN DAVID MICHAEL (US)
TILTON FREDERICK THOMAS (US)
GRAY KEVIN LEON (US)
BRUNNERT DAVID (US)
BADRAK ROBERT (US)
SIMPSON NEIL ALEXANDER ABERCRO (GB)

E21B7/06; E21B7/08; E21B17/07; E21B27/00; E21B29/02; E21B29/06; (IPC1-7): E21B29/02; E21B29/06; E21B7/08; E21B17/07; E21B27/00

WO1999064715A1	1999-12-16
WO2000066876A1	2000-11-09
WO2000050727A1	2000-08-31

GB2346633A	2000-08-16
US5791417A	1998-08-11
US5135050A	1992-08-04
US6016753A	2000-01-25
EP0846838A2	1998-06-10
US2506799A	1950-05-09
US4905759A	1990-03-06
US5435394A	1995-07-25
GB2177740A	1987-01-28

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