低渗透油藏调驱用凝胶泡沫体系的应用

Oil displacement-gel foam system applying to low permeable reservoir

以铝盐为主剂,尿素为助剂得到无机凝胶体系,并加入复配泡沫剂在一定条件下反应生成凝胶泡沫体系。分析了影响凝胶体系成胶的因素,考察了成胶后凝胶的性能。实验结果表明,无机凝胶体系随主剂用量的增大,成胶时间延长,凝胶强度增大;随助剂用量的增大,成胶时间缩短,凝胶强度增大;随温度的升高和矿化度的增大,成胶时间缩短。泡沫剂的加入对凝胶的成胶性能没有影响。该凝胶泡沫体系能够耐温130℃,耐盐20×10~4 mg/L,耐钙、镁离子5000 mg/L,成胶时间和成胶强度可控。中原油田采油一厂文13-195等7个井组现场应用表明,该体系具有良好的调驱效果,可用于低渗透油藏深部调驱。利用凝胶成胶强度模型,可指导现场凝胶成胶强度的预测和配方优化,平均相对偏差为0.51%。

The inorganic gel system was obtained by using the aluminum salt as the main agent and carbamide as the additive agent.The mixed gel foam system was added to the gel foam system under certain condition.The affecting factors of gelling and the properties of gelled system were investigated.The results show that with the main agent increases the gel time is extended and the gel strength increases.With the increase of temperature and salinity,the gelling time becomes shorter.The addition of foam agent has no effect on the performance of gel system.The inorganic gel foam system can endure 130℃,salt 20×104 mg/L and Ca2++Mg2+5 000 mg/L.It has characteristics such as controllable gel time and controllable gel strength.The field application result of this system applied to well groups Wen 13-195 oil production plant in Zhongyuan oilfield showed that this system has good profile control and oil flood effect.It is suitable for deep profile control of low permeable reservoir.Gel gelling strength model is established which can be used to guide the field application and the average relative deviation is smaller than 0.51%.