The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 1991
Filed:
Dec. 20, 1989
Suzanne Griston, San Dimas, CA (US);
Frank L Cire, Pomona, CA (US);
Chevron Research and Technology Company, San Francisco, CA (US);
Abstract
An improved method for deteriming 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.