Wells – Processes – Heating – cooling or insulating
Reexamination Certificate
2008-04-01
2008-04-01
Bagnell, David (Department: 3676)
Wells
Processes
Heating, cooling or insulating
C166S222000, C166S242500
Reexamination Certificate
active
07350577
ABSTRACT:
The present invention generally provides a method and apparatus for injecting a compressible fluid at a controlled flow rate into a geological formation at multiple zones of interest. In one aspect, the invention provides a tubing string with a pocket and a nozzle at each isolated zone. The nozzle permits a predetermined, controlled flow rate to be maintained at higher annulus to tubing pressure ratios. In another aspect, the present invention assures that the fluid is supplied uniformly to a long horizontal wellbore by providing controlled injection at multiple locations that are distributed throughout the length of the wellbore. In another aspect, the invention ensures that saturated steam is injected into a formation in a predetermined proportion of water and vapor by providing a plurality of apertures between a tubing wall and a pocket.
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Suzanne Griston, et al., “Field Test Of Tapered-Bore Chokes For Steam Flow Control”, Abstract, SPE #35677, May 22, 1996, pp. 269-283, XP002248011, Introduction, p. 269, col. 2, Figures 1, 2.
Howard William F.
Robinson Dudley L.
Schmidt Ronald W.
Sims Jackie C.
Bagnell David
Bomar Shane
Patterson & Sheridan LLP
Weatherford / Lamb, Inc.
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