泡沫油稳定性主控因素实验研究

泡沫油在天然能量开采过程中具有"原油粘度高、生产气油比低、原油日产水平高、产量递减慢、天然能量开采采收率高"等特有的开采特征;而泡沫的稳定性是决定"泡沫油现象"存在时间长短的最关键因素。为定量描述泡沫稳定性的主控因素,自主研制了高温高压泡沫油可视化稳定性测试模型,并利用该模型开展了温度、溶解气油比、降压速度及孔隙尺寸对泡沫稳定性的单因素影响规律评价实验。实验结果表明,泡沫油中泡沫稳定存在的最高温度为60℃,最低极限原始溶解气油比为5 m3/m3,最低降压速度为0.08 MPa/min;同时发现,在越接近油藏实际孔隙尺寸的多孔介质中,泡沫的存在时间越长,表明在实际油藏天然能量开发过程中,"泡沫油现象"将会长期存在。以上认识有效地指导了MPE-3油藏天然能量开发,对于类似稠油/超稠油油藏确定合理的开发操作策略,实现经济高效开发具有重要指导意义。

Experimental Study on Controlling Factors of Foamy Oil Stability

In the process of natural energy depletion, particularly,the foamy oil is a characteristic of "high oil viscosity,low produced gas & oil ratio,high level of oil rate,low production decline rate,and high natural depletion recovery factor",and the foamy oil stability is a crucial factor to determine the time of "foamy oil phenomenon".Aimed at quantifying the controlling factors affecting the foamy oil stability,the high-temperature-high-pressure(HTHP) visualized foamy oil stability test model is designed and used to test foamy oil stability under conditions of different temperature,original dissolved gas & oil ratio(GOR),pressure decline rate and pore size.Experimental results indicate that the highest temperature for stable existence of foamy oil is 60 ℃,the least original dissolved gas & oil ratio(GOR) is 5 m3/m3,the lowest pressure decline rate is 0.08 MPa/min;and it is found that the stability time of foamy oil becomes longer where porous media gets similar to the real reservoir condition,which indicates that during practical natural energy depletion phase,the "foamy oil phenomenon" will exist for a long time.The findings above effectively guided the development of MPE-3 reservoir by natural energy depletion,and played an important guidance for choosing rational operation strategy and realizing economic and efficient development for similar heavy oil reservoirs.