超深层稠油二氧化碳吞吐渗流规律

发布时间：2018-05-12 16:52

本文选题：超深层稠油 + 二氧化碳吞吐　；参考：《特种油气藏》2017年04期

【摘要】：针对超深层稠油热力降黏效果差的问题,提出了CO_2吞吐降黏的开发方案。以物理模拟实验为基础,通过人造三维岩心,模拟超深层稠油直井CO_2吞吐开发过程,研究吞吐井的压力、周期产量以及不同生产阶段的产出油形态变化,并对三维岩心不同位置处由于CO_2扩散引起的压力变化规律进行了分析和探讨。研究表明:超深层稠油CO_2吞吐开发过程中,其渗流规律会发生阶段性变化,依照渗流规律的变化可将生产过程划分为CO_2回采泄压、降压稳产、稳压泄油3个阶段;从井筒到地层远端可划分为CO_2饱和区、CO_2扩散区、压力响应区3个渗流区域。研究结果为超深层稠油降黏及开发方式的优化提供了参考。
[Abstract]:Aiming at the problem of poor thermal viscosity reduction effect of ultra deep heavy oil, the development scheme of CO_2 huff and puff viscosity reduction is put forward. On the basis of physical simulation experiment, the CO_2 huff and puff development process of ultra-deep heavy oil vertical well is simulated by artificial three-dimensional core. The pressure, periodic production rate and the variation of produced oil morphology in different production stages are studied. The variation law of pressure caused by CO_2 diffusion at different positions of three dimensional core is analyzed and discussed. The results show that during the development of ultra-deep heavy oil CO_2, the percolation law will change periodically. According to the variation of percolation law, the production process can be divided into three stages: CO_2 recovery and pressure relief, pressure reduction and stable production, and steady pressure release. From the wellbore to the far end of the formation, it can be divided into three percolation zones: CO_2 saturated area and pressure response zone. The results provide a reference for the optimization of viscosity reduction and development mode of super deep heavy oil.
【作者单位】：中国石化胜利油田分公司;
【基金】：中国石化科研项目“垦西油田罗322超深层低渗稠油有效开发技术”(P14009)
【分类号】：TE345

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