Kappa
Ecrin is a dynamically linked well test module to design and
analyze either rate-time (TOPAZE) or pressure-time (SAPHIR)
transient tests   These modules can accommodate a variety of
well and reservoir models, offset well interference and
performance of multiple layers with differing initial pressures.  
They can be run in either analytic or numerical mode.  NL will model
unconventional performance.  Well modules include horizontal wells
with multiple transverse fractures.