Title:
METHOD AND APPARATUS FOR ACCURATE MILLING OF WINDOWS IN WELL CASINGS
Document Type and Number:
WIPO Patent Application WO2000063521
Kind Code:
A9
Abstract:
A method and apparatus for predictable downhole milling of a casing window having predetermined location, orientation, dimension and contour geometry. An elongate substantially rigid milling shaft (62) has at least one casing window milling element (88, 90) in fixed relation therewith and has a pilot mill (34) in articulated and rotary driven connection with the milling shaft (62). The milling shaft (62) is in articulated and rotary driven connection with a rotary drive mechanism. The articulated connection (56, 58) of the pilot mill (34) and milling shaft (62) may incorporate an articulation control system to permit the pilot mill (34) to be maintained substantially coaxial with the milling shaft (62) so that its trajectory at a predetermined stage of window milling can be controlled by the milling shaft (62) when positive guiding by a deflecting tool (12) can no longer be ensured.
Inventors:
OHMER HERVE
BROCKMAN MARK W
KOPTILOV PLATON
VUYK ADRIAN
BROCKMAN MARK W
KOPTILOV PLATON
VUYK ADRIAN
Application Number:
PCT/US2000/010281
Publication Date:
April 04, 2002
Filing Date:
April 14, 2000
Export Citation:
Assignee:
SCHLUMBERGER TECHNOLOGY CORP (US)
International Classes:
E21B7/06; E21B7/08; E21B29/06; (IPC1-7): E21B29/06; E21B7/08; E21B10/04; E21B17/04; E21B17/20; E21B23/00
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