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为满足吉林油田特低渗透区块CO2泡沫驱的要求,利用法国ST公司生产的高温高压全可视PVT测试仪,将室内静态实验筛选出的泡沫体系,进行高温P-V特性实验测定,以判断在地层的高温高压环境该泡沫体系是否能够稳定存在。实验结果表明:温度一定时,低压与高压时,PVT筒内形成泡沫的尺寸不同;低压时泡沫尺寸较大,且体系不稳定,停止搅拌立即析液;随着压力升高,PVT筒内形成的泡沫越来越细小,稳定性提高,停止搅拌析液速度减慢。通过实验观测发现,100℃时形成稳定泡沫的临界压力为30 MPa;同时该压力也是泡沫体系的P-V、P-ρ关系曲线的变化趋势变缓的转折点。最后研究发现,通过地面检测泡沫体系的密度可以判断地面发泡时是否已形成稳定的泡沫。
In order to meet the requirement of CO2 foam flooding in ultra-low permeable blocks in Jilin Oilfield, the high temperature and high pressure all-visual PVT tester produced by ST Company of France was used to determine the foam system which was screened by static experiment in the room. Stratum high temperature and high pressure environment whether the foam system can exist stably. The experimental results show that when the pressure is high, the size of foams formed in PVT is different at low pressure and high pressure. When the pressure is low, the size of foams is large and the system is unstable. The liquid is stopped immediately after stirring. With the increase of pressure, The foam is getting smaller and smaller, the stability is improved, and the speed of stopping the stirring is slowed down. The experimental observation shows that the critical pressure for the formation of a stable foam at 100 ° C is 30 MPa. At the same time, this pressure is also a turning point for the change trend of the P-V and P-ρ curves of the foam system to slow down. The final study found that the density of the foam system can be detected by the ground to determine whether a stable foam has formed on the ground during foaming.