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:
May. 05, 1981
Filed:
Jun. 25, 1979
William R Mills, Jr, Duncanville, TX (US);
Mobil Oil Corporation, Fairfax, VA (US);
Abstract
Methods and apparatus for radioactive well logging in which the formation is irradiated with bursts of primary radiation and the resulting secondary radiation is measured during a plurality of time windows occurring subsequent to the primary radiation burst. A plurality of ratio functions are established which are representative of the radiation count rates measured during adjacent pairs of the time windows. The ratio functions are compared with each other and at least one ratio function is selected. The selected ratio function is employed to generate a signal representative of the decay rate of the secondary radiation. The invention may be employed in epithermal neutron decay logging and at least a portion of the time windows may be of successively greater lengths.