Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1975-11-03
1977-07-12
Willis, Davis L.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250265, 250270, G01v 500
Patent
active
040356400
ABSTRACT:
Measurement of the linear flow velocity and volume flow rate of undesired behind casing water flow is provided. A well tool having a 14 MEV pulsed neutron source is used to irradiate the earth formations behind well casing with bursts of high energy neutrons. This irradiation activates elemental oxygen nuclei comprising the molecular structure of the undesired flow. Dual spaced gamma ray detectors located above or below the neutron source detect the decay of unstable isotope nitrogen 16 produced by the oxygen activation in the time intervals between the neutron bursts. Background radiation due to prompt N-.sigma. radiation is thus largely avoided. From the detected nitrogen 16 characteristic gamma rays the linear flow velocity of the undesired flow is determined. By combining this with an estimation of the distance R to the undesired flow region from the detectors, the volume flow rate V may be deduced.
REFERENCES:
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.
Peelman Harold E.
Beard William J.
Ries Carl G.
Texaco Inc.
Whaley Thomas H.
Willis Davis L.
LandOfFree
Behind casing water flow detection using pulsed neutron oxygen a does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Behind casing water flow detection using pulsed neutron oxygen a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Behind casing water flow detection using pulsed neutron oxygen a will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-489583