Gunter Lichtenberger, Sun Production Company
In secondary or tertiary recovery projects fluids are injected into the rock formations to sweep residual hydrocarbons to producing wells. To optimize this operation the fluids must be injected at specified rates into the desired depth intervals. Therefore, injection profiles are run to determine the injection rates as a function of depth. Although temperature and noise logs can provide some qualitative data, spinner surveys or radioactive (abbreviated r/a) tracer logs are run if quantitative results are desired. At the present time by far the most popular method in use is the downhole radioactive tracer ejection method. The objective of this paper is to review the basic principles underlying this technique.