Detection of behind casing water flow at an angle to the axis of

Details Detection of behind casing water flow at an angle to the axis of Detection of behind casing water flow at an angle to the axis of

1976-06-21

1978-01-31

Willis, Davis L.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250270, G01V 500

Patent

active

040717577

ABSTRACT:
Methods and apparatus are disclosed herein for detecting undesired water flow at an angle to the axis of a well borehole. The borehole envisons is irradiated with 14 MEV neutrons resulting in the in situ creation of the radioactive tracer element N.sup.16 in the flowing water. Two spaced gamma ray detectors are used to sense gamma rays produced by the decay of this radioactive isotope. The distance from the center of each detector to the center of the flowing water is used to establish the angle of flow with respect to the well tool, the linear flow rate of the flow v and the volume flow rate V of the undesired water flow.

REFERENCES:
patent: 3603795 (1971-09-01), Allaud
patent: 3851171 (1974-11-01), Saniford et al.

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