Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Reexamination Certificate
2007-10-30
2007-10-30
Neuder, William P (Department: 3672)
Wells
Valves, closures or changeable restrictors
Longitudinally movable operator
C166S332400
Reexamination Certificate
active
11010072
ABSTRACT:
One or more flapper valve assemblies are placed in a casing string extending through one or more hydrocarbon bearing intervals. The flapper valve assemblies are placed between some of the hydrocarbon bearing intervals. In an open or inoperative position, the flapper valve assemblies are full opening compared to the casing string. The hydrocarbon bearing intervals are stimulated, typically by fracing, starting with the bottom zone. The flapper valve assembly immediately above the stimulated interval is manipulated to allow it to close, preventing downward flow in the well and thereby isolating the lower stimulated interval so an upper interval can be stimulated. The well is easy to put on production because the flapper valves will normally open simply by opening the well at the surface.
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Chapman William W.
Frazier W. Lynn
Edmonds Robb D.
Edmonds PC
Neuder William P
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