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通过大量的室内实验,筛选出可适用于中低温的稠油油藏的自生CO2泡沫驱油体系。在油藏温度下,筛选出自生CO2泡沫驱油体系,研究温度对自生CO2泡沫体系的泡沫性质的影响,同时对自生CO2泡沫驱油体系的界面张力和粘度稳定性进行评价。实验结果表明,黄原胶做稳泡剂时,能保持粘度的长期稳定稳定性;自生CO2泡沫体系比单一聚合物能提高的采收率6.2-8.4个百分点。
A large number of laboratory experiments were conducted to identify the spontaneous CO2 foam flooding system that could be applied to medium and low temperature heavy oil reservoirs. The effect of temperature on the foam properties of the spontaneous CO2 foam system was studied at the reservoir temperature, and the interfacial tension and viscosity stability of the spontaneous CO2 foam flooding system were also evaluated. The experimental results show that when xanthan gum is a foam stabilizer, the long-term stability of viscosity can be maintained. The recovery rate of spontaneous CO2 foam system is 6.2-8.4% higher than that of a single polymer.