稠油注气二次泡沫油形成机理及数值模拟

发布时间：2018-05-30 02:04

本文选题：气驱 + 天然气吞吐　；参考：《石油与天然气地质》2017年02期

【摘要】：从油气形成二次泡沫油的角度出发,研究改善稠油油藏冷采后期开发效果的新方法。首先,设计泡沫油非常规注气膨胀实验,验证注气二次泡沫油形成的可行性,揭示其提高采收率机理。在此基础上,通过填砂管实验研究天然气吞吐、连续和间歇气驱过程中二次泡沫油形成过程,并建立考虑泡沫油注气特征的油藏数值模拟模型,模拟注气二次泡沫油形成机理,评价实际油藏中不同注气方式下二次泡沫油提高采收率效果。实验研究表明,注入天然气可以形成二次泡沫油,其主要的提高采收率机理为体积膨胀、粘度降低以及轻组分含量增加。天然气吞吐较衰竭开发提高采出程度7.24%,而连续与间歇气驱导致泡沫油现象减弱或消失,进而使得采出程度低于衰竭开发实验。油藏数值模拟研究表明,由于注气二次泡沫油的形成,平台12口井8轮次天然气吞吐累积产油量较衰竭开发增加14.7%。行列连续、间歇和边部气驱气窜现象严重,无法形成二次泡沫油。
[Abstract]:From the point of view of oil and gas forming secondary foam oil, a new method to improve the development effect of heavy oil reservoir in the late stage of cold recovery is studied. Firstly, the unconventional gas injection expansion experiment of foam oil was designed to verify the feasibility of the formation of gas injection secondary foam oil, and to reveal the mechanism of enhancing oil recovery. On this basis, the formation process of secondary foam oil in the process of natural gas huff and puff, continuous and intermittent gas drive is studied by filling sand pipe experiment, and a reservoir numerical simulation model considering the characteristics of gas injection of foam oil is established to simulate the formation mechanism of secondary foam oil injection. To evaluate the effect of secondary foam oil on oil recovery under different injection modes in real reservoir. The experimental results show that the secondary foam oil can be formed by injecting natural gas. The main mechanisms of increasing oil recovery are volume expansion, viscosity reduction and increase of light component content. The recovery degree of natural gas huff and puff is 7.24% higher than that of exhausted development, while continuous and intermittent gas flooding leads to the decrease or disappearance of foam oil phenomenon, which makes the recovery degree lower than that of exhausted development experiment. The reservoir numerical simulation results show that due to the formation of gas injection secondary foam oil, the accumulative oil production of natural gas huff and puff in 8 rounds of 12 wells on the platform is increased by 14.7g in comparison with the exhausted development. Row and column continuous, intermittent and edge gas drive gas channeling phenomenon is serious, can not form secondary foam oil.
【作者单位】：中国石油大学(华东)石油工程学院;中国石油塔里木油田分公司;中国石油新疆油田分公司工程技术研究院;中国石油勘探开发研究院;
【基金】：国家自然基金青年基金项目(51604293) 山东省自然科学基金项目(ZR2016EEB30) 中央高校基本科研业务费专项资金资助(17CX02009A)
【分类号】：TE357.7

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