Method of measuring horizontal fluid flow in cased off...

Details Method of measuring horizontal fluid flow in cased off... Method of measuring horizontal fluid flow in cased off...

G - Physics

01

V

358/4

G01V 5/00 (2006.01)

Patent

CA 1106079

METHOD OF MEASURING HORIZONTAL FLUID FLOW IN CASED OFF SUBSURFACE FORMATIONS WITH MANGANESE COMPENSATION (D#76,046) ABSTRACT OF THE DISCLOSURE Fluid in permeable earth formations adjacent well casing is irradiated with neutrons to form radioactive tracer isotopes in the chemical elements comprising the fluid, typically sodium 24 in saline subsurface formation water, which decays by emission of gamma rays. By measuring the rate of decay of the radioactive isotope, a measure of horizontal fluid flow in the formation is obtained. Manga- nese, present in the steel well casing, has been found to also respond to the neutron irradiation by forming the isotope manganese 56 which emits gamma rays which interfere with the gamma radiation measurements of the trace element indicative of water flow. A method of measuring horizontal fluid flow while compensating for the presence of manganese 56 gamma rays is disclosed. -I-

318994

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