Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1975-05-22
1976-08-24
Willis, Davis L.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250269, G01V 500
Patent
active
039768791
ABSTRACT:
In accordance with an illustrative embodiment of the present invention, a method and apparatus for logging an earth formation of interest is disclosed in which repetitive bursts of a continuous energy spectrum of photons are emitted that penetrate the media surrounding a borehole traversing the earth formation. Thereafter, indications of photons resulting from the interaction of the emitted photons and the surrounding media are obtained, each indication begin obtained at a different separation from the source along the axis of the borehole. Finally, the indications are compared to determine representations of a characteristic of the media surrounding the borehole. According to one aspect of the present invention, at least one of the indications is the result of annihilation photons produced by the interaction of the emitted photons and the surrounding media.
REFERENCES:
patent: 3223968 (1965-12-01), De Shazo, Jr.
patent: 3564251 (1971-02-01), Youmans
patent: 3846631 (1974-11-01), Kehler
patent: 3864569 (1975-02-01), Tittman
patent: R23226 (1950-05-01), Bender
Olsen Kenneth
Roney Edward M.
Schlumberger Technology Corporation
Sherman William R.
Willis Davis L.
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