Resolution of through tubing fluid flow and behind casing fluid

Details Resolution of through tubing fluid flow and behind casing fluid Resolution of through tubing fluid flow and behind casing fluid

1975-11-03

1977-09-06

Willis, Davis L.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250265, 250270, G01V 500

Patent

active

040470288

ABSTRACT:
A method is provided for resolving undesired fluid flow in cement channels behind casing in one producing zone of a multi zone completion well operating on gas lift from the fluid flow from lower producing zones in the same well which is contained in production tubing passing through the producing zone being investigated. Gamma rays which are characteristic of the decay of the unstable isotope nitrogen 16 produced by activation of elemental oxygen nuclei comprising the molecular structure of both the tubing fluid flow and the undesired fluid flow are detected in at least two energy bonds at two longitudinally spaced detectors in a well borehole. By appropriately combining the four count rate signals so producing according to predetermined relationships the two fluid flow components in the same direction may be uniquely distinguished on the basis of their differing distances from the gamma ray detectors.

REFERENCES:
patent: 3075077 (1963-01-01), Staker et al.
patent: 3603795 (1971-09-01), Allaud
patent: 3930153 (1975-12-01), Scott

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