A multi-layered radial flow model interpretation of drill stem test data

Abstract

Five sets of drill stem test data from adjacent zones in a borehole are analysed for hydraulic conductivities using the traditional Horner method, a single-layer radial flow model and a multi-layer radial flow model. An optimised interpretation has been used in the last model. The results show that head responses resulting from tests are important in zones juxtaposed to the test zone and must be accounted for in hydraulic conductivity determinations. The most suitable method is shown to be the optimised multi-layer radial model.