| Description |
i, 37 leaves : illustrations ; 29 cm |
| Summary |
"With the advent of field research in which radioactive isotopes are used as tracers for water injected in secondary-recovery operations, knowledge of the probable transit time between wells of an injected tracer, its concentration at detection points, and the resultant optimum injection concentration has become important. Both detection and, consequently, injection concentrations of radioactive tracers are at least in part functions of the loss of tracer for various reasons, flow characteristics between wells, the rate of decay of radioactive emission, and the sensitivity of the detection apparatus. A method, based on the characteristics of a homogeneous 5-spot system, has been developed for predicting the approximate arrival time at a production well of any injected tracer, the injection concentration of tracer necessary to insure detectable concentration at the production well, and the optimum period of time over which the tracer should be injected. The basic flow equation relating reservoir parameters to first arrival time of injected tracer is solved graphically. Graphs also are used to determine the frontal advance of the tracer slug along various flow paths and to locate the position of the front and rear of the tracer slug at any time after injection. Tracer concentration at the production well is expressed as the produced-volume ratio of tracer-bearing fluid to barren fluid. Deviation of actual field concentration curves from those predicted by the described method, which assumes homogeneity, should provide information of practical value concerning reservoir heterogeneities"--Abstract, leaf 1. |
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