Abstract:

The composite hot foam system is an important replacement technique for enhancing oil recovery after polymer flooding and has some properties of the foam flooding and thermal flooding techniques and also has a certain effect of carbon dioxide and nitrogen flooding. In the laboratory experiment, the HY-3 surfactant was taken as the foaming agent, and the hot flue gas was chosen as the foaming gas, and sodium carboxymethylcellulose was chosen as the foam stabilizer. The experimental results showed that the effect of foaming agent and flue gas injection at the same time was better than that of them injected alternatively. With the increase of the composite hot foam slug, the oil-displacement pressure difference and oil recovery of foam flooding increased. The optimized foam slug was 0.6 PV. Adding stabilizer into the foam system could increase the strength of the composite hot foam system and the extent of enhanced oil recovery. After polymer flooding, extent of composite hot foam flooding recovery increased with temperature increasing. Under the condition of high temperature, the extent of enhanced oil recovery reached 16.29% for the composite hot foam flooding.

Key words: composite hot foam system, foaming agent, foam stabilizer, injection pattern, displacement effect, high pressure flooding experiment

摘要：

复合热泡沫体系驱油是聚合物驱之后进一步提高原油采收率的一项重要接替技术。该体系具有泡沫驱油和热力采油的优点，又具有一定二氧化碳和氮气驱油的作用。实验选择HY-3表面活性剂为发泡剂，热烟道气为发泡气体，羧甲基纤维素纳为稳泡剂。实验结果表明，起泡体系与烟道气同时注入方式提高采收率的效果好于交替注入效果;随着复合热泡沫段塞的增大，驱替压差和泡沫驱采收率随之增加,优化出的泡沫段塞为0.6PV；复合热泡沫体系加入稳泡剂后，增加了复合热泡沫的强度，原油采收率的提高幅度增加；聚合物驱后，复合热泡沫体系驱提高采收率的幅度随温度的提高而增加，高温条件下，复合热泡沫驱油提高采收率达到16.29%。

关键词: 复合热泡沫体系, 发泡剂, 稳泡剂, 注入方式, 驱油效果, 高压驱油实验