Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1974-11-04
1976-07-27
Dixon, Harold A.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250266, 250270, G01V 500
Patent
active
039719359
ABSTRACT:
In the particular embodiments of the invention described, the formation surrounding a cased borehole is irradiated with bursts of high-energy neutrons and the resulting neutron population in the formation is observed at two spaced locations along the borehole. A neutron absorption characteristic of the formation is determined from the population measurement at one location, and a ratio of the population measurements at the two locations, suitably corrected for background radiation, is formed. Preferably, the neutron population measurements at both locations are made during measurement periods which are controlled as a function of the measured value of the neutron characteristic. Cross plots of the ratio and the neutron characteristic values thus derived afford apparent values of formation porosity and formation water salinity, from which water saturation values can be estimated.
REFERENCES:
patent: 3373280 (1968-03-01), Mills
patent: 3462600 (1969-08-01), Dewan
Dixon Harold A.
Schlumberger Technology Corporation
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