ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,504,556, issued on Dec. 23, was assigned to CHINA PETROLEUM & CHEMICAL Corp. (Beijing).
"Method and apparatus for obtaining formation density" was invented by Sheng Zhan (Houston) and Jeremy Zhang (Houston).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for obtaining elemental concentration and determining the formation density uses a tool having multiple dual-function detectors that can detect both neutrons and gamma rays simultaneously. The method includes emitting neutrons into the formation, detecting neutron and gamma ray signals from the formation and discriminating the neutron signal and the gamma ray signal, obtaining the space, time and...