石油学报 ›› 2013, Vol. 34 ›› Issue (2): 340-345.DOI: 10.7623/syxb201302017

• 油田开发 • 上一篇    下一篇

利用CT技术研究重力稳定注气提高采收率机理

冷振鹏 吕伟峰 马德胜 刘庆杰 严守国 李 彤   

  1. 中国石油勘探开发研究院提高石油采收率国家重点实验室 北京 100083
  • 收稿日期:2012-09-16 修回日期:2012-12-30 出版日期:2013-03-25 发布日期:2013-01-31
  • 通讯作者: 冷振鹏
  • 作者简介:冷振鹏,男,1989年2月生,2010年毕业于东北石油大学石油工程专业,现为中国石油勘探开发研究院硕士研究生,主要从事油层物理与渗流力学方面的研究工作。
  • 基金资助:

    国家高技术研究发展计划(863)项目(2013AA061102)、中国石油天然气集团公司科研项目(2011A-1003)和国家重点基础研究发展计划(973)项目(2011CB707302)资助。

Research of enhancing oil recovery mechanism of GAGD using CT scanning method

LENG Zhenpeng  LÜ  Weifeng  MA  Desheng  LIU Qingjie  YAN Shouguo  LI Tong   

  • Received:2012-09-16 Revised:2012-12-30 Online:2013-03-25 Published:2013-01-31

摘要:

重力稳定注气(GAGD)已被证明是一种低成本且能大幅提高采收率的有效技术。笔者以80~200目石英砂混填制作的填砂模型为研究对象,利用CT扫描测量三相流体饱和度技术,开展了高含水后期重力稳定注气提高采收率实验研究。实验结果表明,水驱后采用顶部垂直注气方式能进一步提高采收率7.45%以上。通过CT扫描测量流体饱和度方法可以观察到,由于气液之间的重力差异,注入气驱扫区域内的液体持续向下运移,致使之前水驱形成的残余油“聚并”而形成“富集带”,随着注入气逐渐向底部推进。

关键词: 重力稳定注气, CT扫描, 三相流体饱和度, 提高采收率, 油墙

Abstract:

Gas assisted gravity drainage (GAGD) has been proved  an effective EOR technology with low cost and high recovery percentage. In this paper we carried out an experimental investigation on the enhanced oil recovery mechanism of GAGD in high water-cut stage by means of three-phase saturation measurements based on CT scanning, which was conducted with a sand model randomly filled with 80-200 mesh quartz sands. Experimental results suggested that GAGD in high water-cut stage could enhance oil recovery at least by 7.45%. Due to the gravity difference between gas and liquid, the residual oil previously formed by waterflooding accumulating into an “oil bank”,the oil enrichment zone and advance of “oil bank” by injection gas could be observed through threephase saturation measurement using CT scanning method.

Key words: gas assisted gravity drainage (GAGD), CT scanning, three-phase fluid saturation, enhanced oil recovery (EOR), oil bank