SAGD过程注氮气改善开发效果实验研究

针对辽河油田先导试验区蒸汽辅助重力泄油（SAGD）过程热损失严重的情况，根据SAGD物理模拟的相似准则将该试验区的一个实际SAGD井组转化为物理模型，进行了SAGD比例物理模拟实验，并在SAGD实验过程中注入蒸汽与氮气混合气体，得到了其开发指标的变化规律。研究结果表明：在SAGD过程添加氮气后，蒸汽腔的横向扩展加快，垂向扩展减缓；在SAGD的注入蒸汽中添加氮气能减少蒸汽注入量，增大热效率，提高油汽比，改善蒸汽辅助重力泄油的开发效果；SAGD过程一开始就注入氮气能得到更好的经济效益。

EXPERIMENT OF INJECTING NON-CONDENSABLE GAS DURING SAGD PROCESS TO IMPROVE DEVELOPMENT PERFORMANCE

Because there is severe heat loss during the process of steam assisted gravity drainage (SAGD) in the pilot test area of Liaohe Oilfield，a practical SAGD well group in the area is simulated into physical model according to similarity criterion of SAGD physical simulation，scaled SAGD physical simulation experiment is conducted，during the process of SAGD experiment，the mixed gas of steam and N2 is injected and the change law of production index is acquired.Research result indicates that when N2 is added in SAGD，the lateral expansion of steam chamber is faster and vertical expansion lower.Adding N2 in injected steam in SAGD can reduce the steam-injected amount and enhance heat efficiency and oil/steam ratio，improve the development effectiveness by SAGD.Better economic efficiency can be acquired