Application of SAGD in ultra heavy oil development

SAGD feasibility and reservoir engineering have been studied through investigation of ultra heavy oil development in foreign countries as well as numerical simulation for ultra heavy oil reservoirs in Liaohe oil province. It had been determined to conduct SAGD test in 4 well groups involving vertical and horizontal wells in Guantao formation of Block Du84. After two years of field application, the SAGD test in Guantao reservoir is successful. The steam chamber is expanding at present, and daily oil production of the well groups has increased 72t than that in cyclic steam stimulation stage. It is predicted that SAGD can improve the recovery factor by 27%. SAGD technology is an effective way of converting development scheme of ultra heavy oil reservoir and realizing production substitution in the late stage of cyclic steam stimulation.