Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate
2006-12-19
2006-12-19
Porta, David (Department: 2884)
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
C250S266000, C166S254200, C175S050000
Reexamination Certificate
active
07151254
ABSTRACT:
A logging system for measuring parameters of earth formation penetrated by a well borehole. Measurements made with the system are not adversely affected by varying pressure encountered a borehole environment. This is accomplished by the use of a main compensation element and a detector compensation element to render source and detector geometry invariant to varying pressure. The system is particularly suited for nuclear LWD systems such as back scatter gamma ray density systems. The basic concepts of the system are, however, applicable to other types of nuclear measurement systems that comprise one or more radiation sources, and one or more axially spaced radiation detectors, where system response is a function of source-detector spacing. The basic concepts of the system are also applicable to other types of logging systems, such as electromagnetic and acoustic, where source (transmitter) and sensor (receiver) elements require invariant geometry in order to maximize accuracy of measurements.
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Porta David
Precision Drilling Technology Services Group Inc.
Rosenberger Frederick F.
Wong, Cabello, Lutsch, Rutherford & Brucculeri L.L.P.
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