Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1990-02-16
1991-08-06
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
166247, 166250, G01V 504, G01V 900
Patent
active
050380338
ABSTRACT:
In order to properly treat the tubing of an oil producing borehole, and prevent hazard to personnel at the oil production site, the contamination of tubing by the formation of scale or radioactive deposits on the inner wall thereof is determined by measurement of the low-level radiation emitted by the scale and calculation of the radiation level which would be detected in the vicinity of the outer wall of the tubing in the absence of contributions by the radioactivity of surrounding earth formations. This is accomplished by a logging tool and method which includes a sonde which includes a detector and is lowered in the tubing to detect and count the gamma rays emitted by the scale or radioactive deposits at different depths in the borehole tubing. Data processing determines the radioactivity level within the tubing from the measured gamma rays, and calculates from that level the level of radioactivity which would have been detected outside and in the vicinity of the tubing by applying a first tubing thickness attenuation factor. In a preferred embodiment, data processing corrects for the natural background radioactivity level by subtracting a reference natural radio activity level, itself corrected for tubing thickness by applying a second tubing thickness attenuation factor.
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"Radioactivity Well Logging Anomalies", from John L. P. Campbell, The Petroleum Engineer, Jun. 1951, pp. B-7 to B-12, See Page B-7, column 2, line 21 to column 3, line 18.
"Radioactive-Scale Formation", from A. L. Smith, Journal of Petroleum Technology, Jun. 1987, pp. 697-706.
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Carroll James F.
Scott Hugh D.
Garrana Henry N.
Glick Edward J.
Hannaher Constantine
Schlumberger Technology Corporation
Wagret Frederic C.
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