Abstract: A 3?D scaled physical model was designed and developed for high temperature and high pressure steam injection process. Pujol and Boberg’s scaling criteria and horizontal well similarity criterion were used for the modeling of the reservoir parameters and horizontal well parameters influencing steam injection recovery. Three alternative processes with different well patterns following steam stimulation were studied, including vertical well steam drive, vertical well steam injection and horizontal well production, horizontal well steam injection and vertical well production. The experimental results show that the vertical well steam injection and horizontal well production process (or vertical injector?horizontal producer combination) is of longer high?yield period and high oil rate, with experimental recovery percent of 70%. For a shallow extra?heavy oil reservoir with thickness of 10~15 m, the vertical injector?horizontal producer combination is an option for alternative development process after single well steam stimulation