In this paper shown the results obtained in the Extra – Heavy Oil Samaria Tertary Field by Ciclic Steam Stimulation (CSS) along almost 6 years. We have identified the major variables affecting the process; the thickness of the sand has been identified as the principal parameter to affect the performance of CSS process. It has been found that the temperature decline in thermal production from 35 days to 200 days. For thin thickness loses energy about 40% and for net thickness upper 15 m loses energy about 10% from overburden and underburden formations.
Our primary interest was to optimize present operations and to find infill wells. Actually the recovery factor is 2.3; with the development plan has optimizate with the understanding of the CSS performance in the field, with recovery factor increment from 6.93 to 8.8 in the next three years.