Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate
2007-10-09
2007-10-09
Porta, David (Department: 2884)
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
C250S256000, C250S264000, C250S265000, C250S269300, C250S269700
Reexamination Certificate
active
11208831
ABSTRACT:
A method for determining the diameter of a wellbore, the wellbore being drilled by a drill string immersed in weighted mud, the weighted mud having a significant weight fraction of a heavy component. A well logging instrument having a gamma ray source and energy-sensitive gamma ray detectors rotates within the wellbore to define a transient interface with a facing portion of the wellbore wall. The instrument measures Compton-effect gamma ray scattering and photoelectric-effect gamma ray scattering of gamma rays that cross a first interface, and of later gamma rays that cross an opposite interface, at each of a plurality of locations along the wellbore to produce a group of gamma ray counts at each of a series of wellbore locations. The counts are used to determine standoffs, weight fraction, and wellbore diameter.
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Ellis Darwin V.
Fulton Charles
Kandhai Dhanoolal
Bryant Casey
DeStefanis Jody Lynn
Lee John
Loccisano Vincent
Porta David
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