Method of measuring horizontal flow speed of fluids in earth formations penetrated by a wellborehole
 The horizontal flow rate of fluid in permeable earth formations is measured by the in situ creation of a radioactive tracer isotope having a predetermined decay life time and decay mode. Measurements at different time intervals following the creation of the tracer isotope of the decay radiation may then be interpreted in terms of the horizontal movement of fluids past a well borehole. Tracer isotopes to be created are selectively provided for measuring both relatively fast and relatively slow expected values of horizontal flow speed. 
Texaco Inc.
E G
E21B G01V
inventional inventional
Hubert D. Dan M. Hans J.
Scott Arnold Paap