蒸汽-二氧化碳-助剂吞吐开采技术研究

针对辽河油田杜84块生产中出现的问题而进行了二氧化碳吞吐开采,总结出蒸汽-二氧化碳-助剂辅助吞吐开采稠油工艺的技术机理.利用经验方法确定了二氧化碳吞吐开采稠油的热力学物性特征,包括溶解度和粘度.采用数值模拟方法比较了二氧化碳吞吐与常规蒸汽吞吐采油速度和采收率的差别.结合杜84块油藏的实际情况,对二氧化碳吞吐参数进行了研究,确定了适宜的注汽压力、注汽量和施工工艺.最后对施工效果的统计和分析表明,蒸汽-二氧化碳-助剂吞吐工艺可加快采油速度,是开采稠油、超稠油的经济、有效的工艺技术.

Applied research of steam-carbon dioxide-auxiliary agent huff and puff technology

The steam-carbon dioxide-auxiliary agent huff and puff technology was applied to heavy oil development of Du-84 Block. The mechanism of steam-carbon dioxide-auxiliary agent huff and puff technology was discussed. The thermodynamic properties of heavy oil including solubility and viscosity were determined with the empirical methods. The production rate and recovery factor obtained by carbon dioxide huff and puff technology were compared with those by the conventional steam huff and puff method and analyzed by numerical simulation. In accordance with the real situation of Du-84 Block, carbon dioxide huff and puff parameters were analyzed, and the proper steam injection pressure, steam injection rate and operation processes were determined. The statistics of operation effectiveness show that carbon dioxide huff and puff technology can increase the rate of oil production significantly and may be the economic and effective technique for production of heavy oil and high pour point oil.