This paper introduces a steam-foam drive profile modification technology for heavy oil development in Block Qi40 based on an in-depth study of the characteristics of heavy oil reservoir and cross flow characteristics of injected steam in Block Qi40 of Liaohe Oilfield. The performance evaluation was carried out indoors for foaming agents. Influencing factors affecting profile modification and foam injection mode selection are studied. The results show that the CX-4 foaming agent system has excellent foaming properties and foam stability at 300°C. The plugging pressure difference of core can be increased by more than 15 times at 240°C. When a 0.5 PV foaming agent system is injected, the oil displacement efficiency can reach more than 68%. The optimal concentration of the foaming agent is 0.5% and the change of resistance factor is the largest in the range of oil saturation between 15 and 20%. Foam has better plugging ability in high permeability and large pores. Furthermore, after field application effect analysis, it confirms that the steam-foam profile modification technology has an obvious effect on enhancing oil recovery.

中文翻译：

---

蒸汽-泡沫驱调剖技术在稠油油藏开发中的应用研究

本文在深入研究辽河油田齐40区块稠油储层特征和注入蒸汽错流特征的基础上，介绍了汽泡驱调剖技术用于齐40区块稠油开发。发泡剂的性能评价在室内进行。研究了影响调剖和泡沫注入方式选择的影响因素。结果表明，CX-4发泡剂体系在300℃下具有优异的发泡性能和泡沫稳定性。240℃时岩心堵漏压差可提高15倍以上。注入0.5PV发泡剂体系时，驱油效率可达68%以上。发泡剂的最佳浓度为0。5%，在含油饱和度在 15% 到 20% 的范围内，阻力系数的变化最大。泡沫在高渗透性和大孔隙中具有更好的堵漏能力。此外，经过现场应用效果分析，证实蒸汽泡沫调剖技术对提高采收率效果明显。