Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent
1995-12-11
1997-06-10
Tsay, Frank
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
166382, 1661176, 166 552, E21B 43116
Patent
active
056366922
ABSTRACT:
A new casing opening formation apparatus has been invented which includes an explosive charge and an apparatus for positioning the explosive charge in a casing in a cased wellbore at a desired location. In one aspect the apparatus includes a drill bit or other drilling device releasably connected to a bit diversion device; and in another aspect the apparatus includes milling apparatus for milling the casing. In one aspect the opening created is a radial ledge for facilitating casing penetration by a mill which mills out a window. In one aspect the opening created has such a radial ledge and includes a slot for inhibiting or preventing coring of the mill. In one aspect the opening created is such a slot alone. In one aspect the opening created is a completed window for sidetracking operations, no further milling is needed and drilling commences in the formation adjacent the explosively created opening. In one aspect the positioning apparatus is a whipstock and a mill is releasably secured to the whipstock to mill past a hole in the casing created by explosion of the explosive charge so that a desired casing window is formed in a single trip of the apparatus into the wellbore.
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McClung Guy
Tsay Frank
Weatherford Enterra U.S., Inc.
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