特种油气藏 ›› 2021, Vol. 28 ›› Issue (1): 130-135.DOI: 10.3969/j.issn.1006-6535.2021.01.019

• 油藏工程 • 上一篇    下一篇

致密油藏超临界二氧化碳吞吐开发特征实验研究

张越琪1, 苟利鹏2, 乔文波2, 鱼耀2, 王庆珍2, 陈明2, 于莹2, 张茂林1   

  1. 1.长江大学,湖北 武汉 451199;
    2.中国石油长庆油田分公司,陕西 西安 710200
  • 收稿日期:2020-03-04 修回日期:2020-07-13 出版日期:2021-02-25 发布日期:2021-04-27
  • 通讯作者: 张茂林(1965—),男,教授,1985年毕业于西南石油学院采油工程专业,2000年毕业于中国科学技术大学流体力学专业,获博士学位,现主要从事油气藏工程、流体相态、渗流力学和数值模拟研究。
  • 作者简介:张越琪(1995—),男,2018年毕业于长江大学石油工程专业,现为该校石油与天然气工程专业在读硕士研究生,主要从事油气田开发方向研究工作。
  • 基金资助:
    国家科技重大专项“大型油气田及煤层气开发”(2016X05047-003)

Experimental Study on Development Characteristics of Supercritical CO2 Huff and Puff in Tight Oil Reservoirs

Zhang Yueqi1, Gou Lipeng2, Qiao Wenbo2, Yu Yao2, Wang Qingzhen2, Chen Ming2, Yu Ying2, Zhang Maolin1   

  1. 1. Yangtze University, Wuhan, Hubei 451199, China;
    2. PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710200, China
  • Received:2020-03-04 Revised:2020-07-13 Online:2021-02-25 Published:2021-04-27

摘要: 针对鄂尔多斯盆地致密油藏采油速度快速递减、油藏压力无法保持的问题,探索采用超临界CO2吞吐开发方式开展超临界CO2吞吐长岩心实验研究,探讨了超临界CO2吞吐方式提高致密油采收率的作用机理、开发特征、影响因素等,探究了注气速度、注气相态、N2辅助保压、衰竭压力等重要操作参数对提高致密油采收率的影响。研究表明:超临界CO2吞吐能有效提高致密油采收率,效果优于常规CO2吞吐;注气速度对采收率影响较小;注N2辅助保压能大幅度提高致密油采收率及换油率;吞吐前3个周期开发效果最佳,占总采收率的91.5%。研究成果证实了注超临界CO2吞吐提高致密油采收率的可行性及巨大应用潜力,可为鄂尔多斯盆地致密油藏高效开发提供理论基础和技术支持。

关键词: 超临界二氧化碳, 吞吐实验, 致密油藏, 提高采收率, 影响因素, 鄂尔多斯盆地

Abstract: In view of the rapid decline in oil recovery rate in tight oil reservoirs of the Ordos Basin and the inability to maintain reservoir pressure, the development method with CO2 huff and puff was discussed, and the experimental study on supercritical CO2 huff and puff with long core was carried out. The mechanism, development characteristics and influencing factors of supercritical CO2 huff and puff in enhancing tight oil recovery were explored. The influence of key operating parameters, such as gas injection rate, gas injection phase, pressure holding with N2, and depletion pressure, on tight oil recovery was discussed. The study shows that: supercritical CO2 huff and puff can effectively improve tight oil recovery, with effect better than conventional CO2 huff and puff. Gas injection rate has little effect on oil recovery. Injection N2 to hold pressure can significantly improve tight oil recovery and oil exchange rage. The first three cycles of huff and puff are of best effect, accounting for 91.5% of the total oil recovery. The research result confirmed the feasibility and huge application potential of supercritical CO2 huff and puff in improving tight oil recovery, and can provide theoretical basis and technical support for the efficient development of tight oil reservoirs in the Ordos Basin.

Key words: supercritical CO2, huff and puff experiment, tight oil reservoir, enhancing oil recovery, influencing factor, ordos Basin

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