Method of measuring horizontal fluid flow in cased off subsurfac

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

1977-06-20

1979-01-30

Willis, Davis L.

Radiant energy

Coded record and readers; invisible radiant energy type

G01V 500

Patent

active

041374525

ABSTRACT:
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. Manganese, 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.

REFERENCES:
patent: 3304424 (1967-02-01), Mills, Jr.
patent: 3603795 (1971-09-01), Allaud
patent: 3864569 (1975-02-01), Tittman

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