Wells – Processes – With indicating – testing – measuring or locating
Reexamination Certificate
2011-08-30
2011-08-30
Bates, Zakiya (Department: 3676)
Wells
Processes
With indicating, testing, measuring or locating
C166S250100, C166S280200
Reexamination Certificate
active
08006754
ABSTRACT:
In one aspect, the invention relates to a method for “tagging” proppants so that they can be tracked and monitored in a downhole environment, based on the use of composite proppant compositions containing dispersed fillers whose electromagnetic properties change at a detectable level under a mechanical stress such as the closure stress of a fracture. In another aspect, the invention relates to composite proppant compositions containing dispersed fillers whose electromagnetic properties change under a mechanical stress such as the closure stress of a fracture. The currently preferred embodiments use substantially spherical thermoset nanocomposite particles where the matrix comprises a terpolymer of styrene, ethylvinylbenzene and divinylbenzene, a PZT alloy manifesting a strong piezoelectric effect or Terfenol-D manifesting giant magnetostrictive behavior is incorporated to provide the ability to track in a downhole environment, and carbon black particles possessing a length that is less than 0.5 microns in at least one principal axis direction may optionally be incorporated as a nanofiller.
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Bates Zakiya
Morgan & Lewis & Bockius, LLP
Sun Drilling Products Corporation
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