超临界CO2驱提高致密油藏采收率实验研究

doi:10.3969/j.issn.1006-6535.2021.03.018

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

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.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 Xiang^1,2, Zhou Dan³, Deng Jiasheng³, Deng Jingyi³, Ray Rui⁴, Jiang Zheren⁵

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/Abstract

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

中图分类号:

TE312

周翔, 周丹, 邓家胜, 邓靖译, Ray Rui, 姜哲人. 超临界CO₂驱提高致密油藏采收率实验研究[J]. 特种油气藏, 2021, 28(3): 118-123.

Zhou Xiang, Zhou Dan, Deng Jiasheng, Deng Jingyi, Ray Rui, Jiang Zheren. Experimental Study on Improving Recovery Efficiency of Tight Oil Reservoirs with Supercritical Carbon Dioxide Flooding[J]. Special Oil & Gas Reservoirs, 2021, 28(3): 118-123.

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超临界CO₂驱提高致密油藏采收率实验研究

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

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