Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate
2006-09-26
2006-09-26
Porta, David (Department: 2884)
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
C250S269600, C250S269700
Reexamination Certificate
active
07112783
ABSTRACT:
The invention concerns a neutron measurement method for determining porosity of an earth formation surrounding a borehole comprising:conveying a tool along said borehole, wherein said tool comprises a source of neutron radiation and at least one detector axially spaced from said source;generating measured detector response for said at least one detector that is indicative of neutron radiation from said source interacting with said earth formations;operating said measured detector response with a predetermined mathematical equation and thereby obtaining corrected detector response that is independent of the density of said earth formation; anddetermining porosity of the earth formation surrounding the borehole from said corrected detector response.The invention also relates to a system implementing said method.
REFERENCES:
patent: 4910397 (1990-03-01), Mills et al.
patent: 5767510 (1998-06-01), Evans
patent: 6207953 (2001-03-01), Wilson
Allioli Françoise
Case Charles R.
Couet Benoit
Ellis Darwin
Evans Michael
Echols Brigitte L.
Porta David
Schlumberger Technology Corporation
Segura Victor H.
Vu Mindy
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