Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Reexamination Certificate
2007-08-14
2007-08-14
Bagnell, David (Department: 3672)
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
C166S055200, C166S206000, C166S207000, C083S036000, C083S054000, C029S407050, C029S557000, C029S896600
Reexamination Certificate
active
11181294
ABSTRACT:
A method of manufacturing an expandable slotted tube fabricated from at least one tubular element and at least two annular elements connected to the opposite ends of the tubular element by means of butt joints wherein axially extending slots are formed at a uniform angular spacing around the periphery of the tube and in longitudinally overlapping relation characterized by cutting said annular elements in a pattern of overlapping positionally fixed slots in accordance with invariable parameters which are pre-determined relative to the dimensions of said annular elements and cutting in said tubular element a pattern of slots that is variable in accordance with measured parameters of the tube so as to achieve the required overlap between said positionally fixed and variable slots. A machine for carrying out the method is also described.
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Bagnell David
Bomar Shane
Patterson & Sheridan L.L.P.
Weatherford / Lamb, Inc.
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