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:
Oct. 09, 1979
Filed:
Sep. 01, 1977
Russel R Randall, Houston, TX (US);
Dresser Industries, Inc., Dallas, TX (US);
Abstract
A source of fast neutrons and two differently spaced detectors are utilized in a well logging instrument, each of such detectors being responsive to the thermal neutron population decay rate. The inverse of this decay rate is proportional to the measured macroscopic absorption cross section (Sigma). The measured Sigma is obtained simultaneously as a function of the radiation detected by each of two detectors. The signal generated which is indicative of the Sigma observed from one detector is subtracted from the Sigma observed by the second detector. The difference between the measured Sigma from two differently spaced detectors provides a unique function of the fluid-filled porosity of the formations giving rise to the measured Sigma values.