The trigger-tube: A new apparatus and method for mixing solutes for injection tests in boreholes

摘要

The trigger-tube apparatus and method has been developed for rapid introduction of homoge-nously mixed solutes in boreholes. Tests gave a Darcy velocity 4.06 m/d, seepage velocity 122.89 rn/d and effective porosity 0.33 using NaCl as conservative tracer. The apparatus and method enables comparatively shorter test-time than is possible using traditional tracer tests by pump mixing method. The trigger-tube apparatus and method is useful for any borehole test that requires introduction of homogenous tracer at specific depths.