Study On Preventing Technology And Mechanism Of Steam Channeling In Extra-heavy Oil Block Zheng411

Wang Zhuang, Zheng411block is super heavy oil reservoir with edge and bottom water.The edge well with steam stimulation rounds and fluid volume continues to increase,formation pressure drop increases ceaselessly, edge water along the high permeability zone,fingering to the bottom, resulting in high water cut in oil well, oil steam ratio decreasing. Inaddition, the block there is steam channeling phenomenon more serious in the heat of steaminjection development, seriously affect the effect of steam injection, difficult to develop work.Advanced conventional nitrogen foam plugging technology has obtained certain result, but theeffect get worse of cycle-by-cycle variation in the process of water invasion problem.Therefore on the base of the existing HDCS development technology, the oil developmentcenter combined with the effect of initial nitrogen foam profile control, developed hightemperature resistant multiphase composite plugging system. The resistance factor is morethan3times than the conventional system, greatly enhancing the plugging performance. Fieldapplication shows that: the tannin extract foam system can effectively block the edge andbottom water and steam channeling or water channeling, improve the periodic developmenteffect, and has wide application prospect.