Method for determining a transit time for a radioactive tracer

Details Method for determining a transit time for a radioactive tracer Method for determining a transit time for a radioactive tracer

G - Physics

01

T

354/21, 358/5.04

G01T 5/02 (2006.01) E21B 43/24 (2006.01) E21B 47/10 (2006.01) G01V 5/00 (2006.01)

Patent

CA 2032418

ABSTRACT OF THE DISCLOSURE An improved method for determining the transit time of a radioactive tracer for steam injection profiles in steam injection wells is disclosed. Radiation decay data is collected at two detectors at different depths. The data is then transformed into a new data set, consisting of time intervals between successive decay events. Tracer radiation decay events are distinguished from background radiation decay events by using statistical methods to establish a high probability that background radiation decay events are excluded. The total set of time intervals are then divided into subgroups of a specified sample size. The arrival time of the tracer is determined as the first time at which a specified minimum number of identified tracer radiation decay events occur successively.

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