Tracer injection method
AssigneeHalliburton Logging Services, Inc.
InventorDan M. Arnold
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Abstract
A tracer injection method is set forth and is practiced by using spaced end located injectors on a sonde having spaced detectors along the length of the sonde. The injectors inject radioactive isotopes which are distinguishable from one another at the detectors. The method contemplates simultaneous injection of different isotopes, making measurements to determine fluid flow velocity in the casing, and selecting peaks to obtain measurements of the fluid flow velocity in leaks through the casing into external channels along the casing.
Claims15
A method of measuring fluid flow velocity along a flowing well comprising the steps of:
- (a) injecting distinguishable first and second fluid soluble radioactive isotopes from a sonde in a well for flow along the well;
- (b) positioning a pair of spaced detectors along the sonde for detection of the isotopes flowing therepast and forming output signals indicative of the flowing isotopes forming past said detectors;
- and
- (c) locating the points of injection so that one isotope is injected above said detectors and the remaining one is below said detector wherein one of said isotopes flows past said detectors to form output signals indicative of fluid flow velocity.
Dependencies are inferred from the claim text.