Laboratory Experiment of Tracer Test with Vertical Two-dimensional Porous Media

In the course of geothermal reservoir development, tracer tests can be one of the most useful methods for evaluating hydrogeo logical characteristics of the reservoir. Laboratory experimental apparatus of tracer test with vertical two -dimensional porous media of 150 cm length, 60 cm height and 2 cm thickness filled with glass beads of 1 mm diameter was manufactured Wells were simulated by injecting and extracting fluid with gear pumps from holes. Twenty holes were made on the outer plastic wall such that the hole can represent wells pen etrating perpendicularly the porous media. In the experiments, 1.2 wt% NaCl solution was used as a tracer. Tracer concentration was measured using conductivity sensor at the production well. We conducted four experiments by changing its positions of the wells. Both flowrates of injection and production were kept constant to be 100 ml/min. When the distance between the reinjection and production wells was increased, the peak values of the tracer concentration became lower and its arriving time grew later.