Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate
2007-12-21
2011-11-22
Kim, Kiho (Department: 2884)
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
Reexamination Certificate
active
08063356
ABSTRACT:
A more precise determination of bulk formation density is attainable using a pulsed γ-γ density tool and simultaneously compensating for interactions due to photoelectric effect and density variations caused by standoff. A source directs energetic particles at a formation having a known photoelectric factor and electron density. One or more photons either emitted or deflected from the formation are captured at a first or second detector, respectively spaced at first and second distances from the source, and separated from each other by a third distance. First and second total energies of the photons respectively striking the first and second detectors are measured during a time interval. A first filter is disposed between the first detector and formation effective to cause Pe response to match standoff influence, thereby compensating for both effects simultaneously. In some embodiments, a second filter is provided between the second detector and formation.
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Case Charles R.
Chen Felix
Ellis Darwin V.
Roscoe Bradley Albert
Zhou Tong
Greene Rachel
Kim Kiho
Laffey Brigid
Schlumberger Technology Corporation
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