Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1975-11-03
1977-11-08
Willis, Davis L.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250270, G01V 500
Patent
active
040577201
ABSTRACT:
Methods are provided for locating and measuring the linear flow velocity and volume flow rate of undesired water production behind casing in a producing well operating on gas lift while the well remains in a producing configuration. A well logging tool sized and adapted for passing through production tubing is lowered through the tubing string into the producing zone. The tool contains a source of 14 MEV neutrons and two longitudinally spaced gamma ray detectors. The detector may be placed alternately above or below the neutron source on the tool while maintaining the same source to detector spacing. With the well on production under gas lift the earth formations behind the casing are irradiated with 14 MEV neutrons, either continuously or in bursts, to activate elemental oxygen nuclei comprising the molecular structure of the undesired water flow. The decay of unstable isotope nitrogen 16 produced thereby is detected by the detection of its characteristic gamma rays at the dual spaced detectors. These measurements may then be interpreted in terms of the linear flow rate and volume flow rate of the undesired water flow.
REFERENCES:
patent: 3075077 (1963-01-01), Staker et al.
patent: 3239663 (1966-03-01), Oshry et al.
patent: 3603795 (1971-09-01), Allaud
patent: 3930153 (1975-12-01), Scott
Arnold Dan M.
Paap Hans J.
Beard William J.
Ries Carl G.
Texaco Inc.
Whaley Thomas H.
Willis Davis L.
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