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SAGD技术的规模实施,使杜84块超稠油实现了高速、高效开发。随开发深入,部分井组以进入中后期生产,各种开发矛盾逐渐显现,经济技术指标呈下降趋势,其主要原因是蒸汽热利用率低和热量散失大,为提高开发效果,探索一种新技术势在必行。国外开发实践表明,向汽腔内注入非凝析气体可有效提高SAGD开发效果。近两年特油公司也在该方面进行了探索实践,将非凝析气体作为SAGD蒸汽腔的充填介质,与蒸汽共同注入到蒸汽腔中,注入的非凝析气体在重力分异及蒸汽凝结的双重作用下趋向于不断的向上运动,并在蒸汽腔顶部聚集,使得汽腔上覆油层逐渐被非凝析气体所占据,从而起到隔挡作用,减少了向盖层的热散失,大幅提高蒸汽热效率,减少蒸汽用量,提高油汽比,并利用理论研究和数值模拟等方法,对注入时机、注入位置、注入气体及注入量进行研究。实施后取得阶段成果,使之成为SAGD开发中后期提高开发效果的核心技术。
SAGD technology implementation of the scale, so that Du 84 ultra-heavy oil to achieve high-speed, efficient development. With the deepening of development, some well groups to enter the late production, various development contradictions gradually appear, economic and technical indicators showed a downward trend, the main reason is the steam utilization rate is low and heat loss, in order to improve the development effect, to explore a new Technology is imperative. Practice abroad shows that the injection of non-condensable gas into the steam chamber can effectively improve the development of SAGD. In the past two years, the special oil company also explored and practiced in this area. The non-condensable gas is used as the filling medium of the SAGD steam chamber and co-injected with the steam into the steam chamber. The injected non-condensable gas is separated by gravity and condensed by steam Of the dual role tends to move up and up, and gathered in the top of the steam chamber, making the steam chamber overlying oil layer is gradually occupied by non-condensable gases, which play a barrier role to reduce the heat loss to the cover, a substantial Improve the steam thermal efficiency, reduce the steam consumption, increase the oil-steam ratio, and use the methods of theoretical research and numerical simulation to study the timing of injection, injection location, injection gas and injection volume. Achieve the stage after the implementation of the results, making SAGD development in the late development to improve the core technology.