超稠油油藏蒸汽与非凝析气驱油数字化实验

在蒸汽辅助重力驱油（SAGD）工艺物理模拟相似准则的基础上，以辽河油田某区块地质特征为原型建立比例物理模型，进行了蒸汽辅助重力驱油（SAED）与蒸汽与非凝析气驱油（SAGP）物理模拟数字实验。得到了两种工艺开采过程的温度场和生产指标结果，对比分析了其开发效果的优劣，并对SAGP过程注非凝析气的种类进行了优化。研究表明：SAGP过程添加非凝析气后，使得蒸汽腔的横向扩展加快，垂向扩展减缓；SAGP过程能减少蒸汽注入量和热损失，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；SAGP过程注二氧化碳的开发效果优于注烟道气，注烟道气优于注氮气；SAGP技术可在提高采收率的同时减少开采过程能量消耗，并有效利用温室气体。

Digital experiment on steam and in-condensable gas push for extra heavy oil reservoir

On the basis of the similarity criterion of steam assisted gravity drainage (SAGD) technology and taking a typical block in Liaohe Oilfield as prototype, a scaled physical model was established. The physical simulations of SAGD and steam and in-condensable gas push (SAGP) technologies were conducted. The expansion of steam chamber and the production indexes of the two technologies were obtained, and the species of in-condensable gas for SAGP technology was optimized. During the injection of in-condensable gas in SAGP process, the vertical expansion speed of steam chamber was slower, but the steam chamber expanded more quickly in the horizontal direction. The quantity of steam and the energy loss were reduced. The heat efficiency and steam-oil ratio were enhanced, and the development performance of SAGD could be improved. The injection efficiency of carbon dioxide in SAGP was better than that of flue gas, and the injection efficiency of flue gas was better than that of nitrogen. The SAGP technology can reduce the energy consumption and the emissions of green house gas in the process of enhanced oil recovery. SAGP technology will be a more promising method for thermal recovery of oilfields.