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:
Jul. 27, 1976
Filed:
Nov. 04, 1974
William B Nelligan, Danbury, CT (US);
Schlumberger Technology Corporation, New York, NY (US);
Abstract
In the particular embodiments of the invention described, the formation surrounding a cased borehole is irradiated with bursts of high-energy neutrons and the resulting neutron population in the formation is observed at two spaced locations along the borehole. A neutron absorption characteristic of the formation is determined from the population measurement at one location, and a ratio of the population measurements at the two locations, suitably corrected for background radiation, is formed. Preferably, the neutron population measurements at both locations are made during measurement periods which are controlled as a function of the measured value of the neutron characteristic. Cross plots of the ratio and the neutron characteristic values thus derived afford apparent values of formation porosity and formation water salinity, from which water saturation values can be estimated.