“…Although AI (Artificial Intelligence) techniques have been used in many branches of the petroleum engineering including well log interpretation (Mohaghegh et al, 1994;Al-Bulushi et al, 2012), seismic interpretation (Boerner et al, 2003), well test model recognition (Allian and Houze, 1995;Al-Kaabi and Lee, 1990;Ershaghi et al, 1993;Athichanagorn and Horne, 1995;Kumoluyi et al, 1995;Alajmi and Ertekin, 2007;Kharrat and Razavi, 2008;Adibifard et al, 2014), and fluid properties estimation (Gharbi et al, 1999;Elsharkwy and Gharbi, 2001;Osman et al, 2001;Huang et al, 2003), there are a few studies regarding the applications of AI in well test nonlinear regression analysis. Güyagüler et al (2001) used GA (Genetic Algorithm) to recognize reservoir model using nonlinear regression analysis technique.…”