特种油气藏 ›› 2021, Vol. 28 ›› Issue (3): 118-123.DOI: 10.3969/j.issn.1006-6535.2021.03.018

• 油藏工程 • 上一篇    下一篇

超临界CO2驱提高致密油藏采收率实验研究

周翔1,2, 周丹3, 邓家胜3, 邓靖译3, Ray Rui4, 姜哲人5   

  1. 1.西南石油大学,四川 成都 610500;
    2.油气藏及地质开发工程国家重点实验室,四川 成都 610500;
    3.中国石油新疆油田分公司,新疆 克拉玛依 834000;
    4.Massachusetts Institute of Technology, Cambridge MA 02139, USA;
    5.中国石油长城钻探工程有限公司,辽宁 盘锦 124010
  • 收稿日期:2020-09-07 修回日期:2021-03-12 出版日期:2021-06-25 发布日期:2022-02-16
  • 作者简介:周翔(1986—),男,副研究员,2009年毕业于长江大学石油工程专业,2019年毕业于加拿大University of Regina石油系统工程专业,获博士学位,现主要从事注CO2开发稠油、致密油油藏研究工作。
  • 基金资助:
    四川省科学技术厅重点研发项目“溶剂辅助SAGD改善开发效率技术研究”(2018FZ0070)

Experimental Study on Improving Recovery Efficiency of Tight Oil Reservoirs with Supercritical Carbon Dioxide Flooding

Zhou Xiang1,2, Zhou Dan3, Deng Jiasheng3, Deng Jingyi3, Ray Rui4, Jiang Zheren5   

  1. 1. Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Chengdu, Sichuan 610500, China;
    3. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China;
    4. Massachusetts Institute of Technology, Cambridge, MA 02139, USA;
    5. Engineering Services Company of CNPC Great Wall Drilling Company, Panjin, Liaoning 124010, China
  • Received:2020-09-07 Revised:2021-03-12 Online:2021-06-25 Published:2022-02-16

摘要: 针对玛湖地区致密油藏衰竭式开发后期采油速度快速递减的问题,提出利用超临界CO2驱替开发致密油藏的研究思路,通过开展超临界CO2萃取致密油实验、最小混相压力实验及长岩心驱替实验,探究了超临界CO2驱替提高致密油采收率的作用机理、开发特征及影响因素,优选了注气速度、CO2转注时机等重要操作参数。实验结果表明:CO2萃取轻质组分能力随萃取次数的增加而减弱;注气速度对最终采收率影响较大,最优注气速度为0.10 cm3/min;原油与超临界CO2最小混相压力为34.18 MPa;当前油藏压力条件为最佳CO2转注时机。该研究成果对致密油藏高效开发具有一定指导意义。

关键词: 超临界CO2, 致密油藏, 提高采收率, CO2驱, 转注时机优选, 玛湖地区

Abstract: In view of rapid decline in oil recovery rate in the late stage of natural depletion of tight oil reservoirs in the Mahu area, a study design of developing tight oil reservoirs with supercritical CO2 displacement was put forward. The experiments on tight oil extraction with supercritical CO2, minimum miscibility pressure and long core displacement were conducted to study the mechanism, development characteristics and influence factors of improving recovery efficiency of tight oil reservoirs with supercritical CO2 displacement, and optimize important operating parameters such as gas injection rate and CO2 injection occasion. The experimental results show that the capacity of light component after CO2 extraction decreased with the increase of extraction times; the gas injection rate had a greater impact on the final recovery efficiency, and the optimal gas injection rate was 0.10 cm3/min; the minimum miscibility pressure of crude oil and supercritical CO2 was 34.18 MPa; the current pressure in the reservoir was the best occasion for CO2 injection. The study results play a guiding role in the efficient development of tight oil reservoirs.

Key words: supercritical carbon dioxide, tight oil reservoirs, improve recovery efficiency, carbon dioxide flooding, optimization of injection occasion, Mahu Area

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