A petroleum well tracer release system comprising one or more petroleum well tracer release flow shunt chamber(s) for being arranged in an annulus space about a base pipe in a petroleum well - said one or more flow shunt chamber(s) extending generally axial-parallel with said basepipe, - said one or more flow shunt chamber(s) provided with shunt flow passage(s) for holding shunt chamber fluid(s), said flow shunt chamber(s) further comprising: - one or more tracer carrier system(s) in said shunt flow passage(s), said tracer carrying system(s) arranged for injecting shots of unique tracer molecules or particles to said shunt chamber fluids according to a control from surface and/or by a downhole state, - one or more first inlet aperture(s) to said flow shunt passage(s) for receiving one or more first fluid from outside said inlet aperture(s), - one or more outlet aperture(s), from said shunt flow passage(s) arranged downstream of said first inlet aperture(s), - said outlet aperture(s) for releasing said shunt chamber fluid to a fluid outside said outlet aperture(s), - one or more flow restrictor nozzle unit(s) arranged in said flow shunt passage between said one or more outlet aperture(s) and said inlet aperture,and downstream said tracer carrier system, allowing a pressure gradient between said one or more inlet and outlet apertures (6, 5) driving said shunt chamber fluid out via said flow restrictor nozzle unit(s). - said one or more flow shunt chamber(s) extending generally axial-parallel with said basepipe, - said one or more flow shunt chamber(s) provided with shunt flow passage(s) for holding shunt chamber fluid(s), said flow shunt chamber(s) further comprising: - one or more tracer carrier system(s) in said shunt flow passage(s), said tracer carrying system(s) arranged for injecting shots of unique tracer molecules or particles to said shunt chamber fluids according to a control from surface and/or by a downhole state, - one or more first inlet aperture(s) to said flow shunt passage(s) for receiving one or more first fluid from outside said inlet aperture(s), - one or more outlet aperture(s), from said shunt flow passage(s) arranged downstream of said first inlet aperture(s), - said outlet aperture(s) for releasing said shunt chamber fluid to a fluid outside said outlet aperture(s), - one or more flow restrictor nozzle unit(s) arranged in said flow shunt passage between said one or more outlet aperture(s) and said inlet aperture,and downstream said tracer carrier system, allowing a pressure gradient between said one or more inlet and outlet apertures (6, 5) driving said shunt chamber fluid out via said flow restrictor nozzle unit(s). - one or more tracer carrier system(s) in said shunt flow passage(s), said tracer carrying system(s) arranged for injecting shots of unique tracer molecules or particles to said shunt chamber fluids according to a control from surface and/or by a downhole state, - one or more first inlet aperture(s) to said flow shunt passage(s) for receiving one or more first fluid from outside said inlet aperture(s), - one or more outlet aperture(s), from said shunt flow passage(s) arranged downstream of said first inlet aperture(s), - said outlet aperture(s) for releasing said shunt chamber fluid to a fluid outside said outlet aperture(s), - one or more flow restrictor nozzle unit(s) arranged in said flow shunt passage between said one or more outlet aperture(s) and said inlet aperture,and downstream said tracer carrier system, allowing a pressure gradient between said one or more inlet and outlet apertures (6, 5) driving said shunt chamber fluid out via said flow restrictor nozzle unit(s).