Petroleum Reservoir Evaluation and Development >

2025 , Vol. 15 >Issue 4: 625 - 631

DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2025.04.011

Methodological Theory

Experimental study on supercritical CO2 huff-n-puff process for mid-deep heavy oil reservoirs

  • Silangluojia ,
  • ZHOU Xiang ,
  • SUN Xinge ,
  • ZHAO Yulong ,
  • ZHANG Liehui ,
  • WU Yang ,
  • PU Hongbin ,
  • JIANG Qi
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  • 1.Southwest Petroleum University, Chengdu, Sichuan 610500, China
    2.Exploration & Development Research Institute, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China
    3.PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China
    4.PetroChina Xinjiang Oilfield Digital Technology Company, Karamay, Xinjiang 834000, China

Received date: 2024-09-06

  Online published: 2025-07-19

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Abstract

With the exploration and development of oil and gas resources in China, heavy oil reservoirs account for more than 20% of domestic reservoir development. The efficient exploitation of heavy oil resources is crucial for China’s energy security. CO2 injection technology has been proven to be an effective method to enhance heavy oil recovery. The mid-deep heavy oil reservoirs in the study area face critical challenges including strong formation water sensitivity and difficulties in large-scale waterflooding development, necessitating a shift from current water injection strategies. To address the unclear mechanism of CO2 injection, unoptimized huff-n-puff development parameters, and lack of experimental research support in the study area, the mid-deep heavy oil reservoir in the Bei 10 well block of Xinjiang oilfield was selected as the research object. Experiments were conducted to investigate CO2 diffusion in crude oil, supercritical CO2 extraction of heavy oil, and the high-temperature and high-pressure long-core huff-n-puff tests, aiming to elucidate the mechanisms of CO2 injection in heavy oil reservoirs and the efficient CO2 huff-n-puff development mechanisms. The experimental results indicated that: (1) the diffusion coefficient of CO2 in heavy oil exhibited a positive correlation with both injection temperature and pressure, with pressure demonstrating a greater influence on the diffusion coefficient than temperature. (2) With increasing extraction cycles, the mass fraction of medium-light components (C6 to C12) decreased significantly, while the mass fraction of medium-heavy components (C14+) gradually increased, particularly evident within the first three extraction cycles. (3) For heavy oil reservoirs, the recovery rate under depletion development was only 7.01%, while CO2 huff-n-puff development proved effective in enhancing recovery, achieving a cumulative recovery rate of 36.94% and an oil replacement ratio of 0.59 t/t (oil production per ton of CO2 injected). (4) Through huff-n-puff experiments, the optimal soaking time was determined to be 1-2 hours, and the optimal pressure depletion rate was 50 kPa/min. The research findings contribute to clarifying the mechanism of enhanced oil recovery by CO2 injection in mid-deep heavy oil reservoirs, while guiding the design of CO2 injection parameters in the Bei 10 well block. Moreover, this study provides critical references for the large-scale application of CO2 huff-n-puff process in the future and offers valuable insights for CO2 injection development in similar reservoirs.

Key words： mid-deep heavy oil reservoir; CO2 huff-n-puff; diffusion; extraction; injection-production parameter optimization

Cite this article

Silangluojia , ZHOU Xiang , SUN Xinge , ZHAO Yulong , ZHANG Liehui , WU Yang , PU Hongbin , JIANG Qi . Experimental study on supercritical CO2 huff-n-puff process for mid-deep heavy oil reservoirs[J]. Petroleum Reservoir Evaluation and Development, 2025 , 15(4) : 625 -631 . DOI: 10.13809/j.cnki.cn32-1825/te.2025.04.011

References

[1] 钱兴坤, 陆如泉, 罗良才, 等. 2023年国内外油气行业发展及2024年展望[J]. 国际石油经济, 2024, 32(2): 1-13.
  QIAN Xingkun, LU Ruquan, LUO Liangcai, et al. Global oil and gas industry in 2023 and outlook for 2024[J]. International Petroleum Economics, 2024, 32(2): 1-13.
[2] 方吉超, 李晓琦, 计秉玉, 等. 中国稠油蒸汽吞吐后提高采收率接替技术前景[J]. 断块油气田, 2022, 29(3): 378-382.
  FANG Jichao, LI Xiaoqi, JI Bingyu, et al. Prospect of replacement technology for enhanced oil recovery after cyclic steam stimulation of heavy oil in China[J]. Fault-Block Oil & Gas Field, 2022, 29(3): 378-382.
[3] 许海鹏, 张新奇, 刘蕊, 等. 准噶尔盆地东部北10井区中深层稠油CO2非混相驱油技术[J]. 大庆石油地质与开发, 2024, 43(1): 142-148.
  XU Haipeng, ZHANG Xinqi, LIU Rui, et al. CO2 immiscible flooding technology for medium-deep heavy oil of Bei 10 well block in eastern Junggar Basin[J]. Petroleum Geology & Oilfield Development in Daqing, 2024, 43(1): 142-148.
[4] 夏正春, 赵健, 刘锋, 等. 吐哈探区稠油油藏注气吞吐适应性评价[J]. 新疆石油地质, 2023, 44(3): 341-346.
  XIA Zhengchun, ZHAO Jian, LIU Feng, et al. Adaptability evaluation of gas huff-n-puff in heavy oil reservoirs in tuha exploration area[J]. Xinjiang Petroleum Geology, 2023, 44(3): 341-346.
[5] 石彦, 谢俊辉, 郭小婷, 等. 新疆油田中深层稠油CO2驱/吞吐实验研究[J]. 油气藏评价与开发, 2024, 14(1): 76-82.
  SHI Yan, XIE Junhui, GUO Xiaoting, et al. Experimental study on CO2 flooding/huff and puff of medium-deep heavy oil in Xinjiang Oilfield[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(1): 76-82.
[6] 程诗胜, 刘松林, 朱苏清. 单井CO2吞吐增油机理及推广应用[J]. 油气田地面工程, 2003, 22(10): 16-17.
  CHENG Shisheng, LIU Songlin, ZHU Suqing. Mechanism of CO2 huff and puff in single well and its popularization and application [J]. Oil-Gas Field Surface Engineering, 2003, 22(10): 16-17.
[7] 武玺, 张祝新, 章晓庆, 等. 大港油田开发中后期稠油油藏CO2吞吐参数优化及实践[J]. 油气藏评价与开发, 2020, 10(3): 80-85.
  WU Xi, ZHANG Zhuxin, ZHANG Xiaoqing, et al. Optimization and practice of CO2 huff and puff parameters of heavy oil reservoir in the middle and late development stage in Dagang Oilfield[J]. Petroleum Reservoir Evaluation and Development, 2020, 10(3): 80-85.
[8] 妥宏, 马愉, 糜娜, 等. 英2井深层稠油油藏注气吞吐降黏实验[J]. 新疆石油地质, 2012, 33(1): 108-110.
  Hong TUO, MA Yu, MI Na, et al. Visbreaking experiment on Ying-2 well deep heavy oil reservoir by gas injection stimulation process [J]. Xinjiang Petroleum Geology, 2012, 33(1): 108-110.
[9] 许国晨, 王锐, 卓龙成, 等. 底水稠油油藏水平井二氧化碳吞吐研究[J]. 特种油气藏, 2017, 24(3): 155-159.
  XU Guochen, WANG Rui, ZHUO Longcheng, et al. Horizontal-well CO2 huff and puff in heavy oil reservoirs with bottom water[J]. Special Oil & Gas Reservoirs, 2017, 24(3): 155-159.
[10] 张娟, 周立发, 张晓辉, 等. 浅薄层稠油油藏水平井CO2吞吐效果[J]. 新疆石油地质, 2018, 39(4): 485-491.
  ZHANG Juan, ZHOU Lifa, ZHANG Xiaohui, et al. Effects of CO2 huff and puff in horizontal wells in shallow-burial thin heavy oil reservoirs[J]. Xinjiang Petroleum Geology, 2018, 39(4): 485-491.
[11] 王晓燕, 章杨, 张杰, 等. 稠油油藏注CO2吞吐提高采收率机制[J]. 中国石油大学学报(自然科学版), 2021, 45(6): 102-111.
  WANG Xiaoyan, ZHANG Yang, ZHANG Jie, et al. EOR mechanisms of CO2 huff and puff process for heavy oil recovery[J]. Journal of China University of Petroleum(Edition of Natural Science), 2021, 45(6): 102-111.
[12] 孙焕泉, 王海涛, 吴光焕, 等. 稠油油藏注CO2提高采收率影响因素研究[J]. 石油实验地质, 2020, 42(6): 1009-1013.
  SUN Huanquan, WANG Haitao, WU Guanghuan, et al. CO2 EOR factors in heavy oil reservoirs[J]. Petroleum Geology & Experiment, 2020, 42(6): 1009-1013.
[13] 戎凯旋, 袁玉凤, 孟小芳, 等. 海上特稠油油藏超临界CO2和蒸汽同注提高采收率研究[J]. 石油化工应用, 2022, 41(9): 16-21.
  RONG Kaixuan, YUAN Yufeng, MENG Xiaofang, et al. Study on enhanced oil recovery by co-injection of supercritical CO2 and steam in offshore extra-heavy oil reservoirs[J]. Petrochemical Industry Application, 2022, 41(9): 16-21.
[14] 杨兆臣, 卢迎波, 杨果, 等. 中深层稠油水平井前置CO2蓄能压裂技术[J]. 岩性油气藏, 2024, 36(1): 178-184.
  YANG Zhaochen, LU Yingbo, YANG Guo, et al. Pre-CO2 energy storage fracturing technology in horizontal wells for medium-deep heavy oil[J]. Lithologic Reservoirs, 2024, 36(1): 178-184.
[15] 关文龙, 蒋有伟, 郭二鹏, 等. “双碳”目标背景下的稠油开发对策[J]. 石油学报, 2023, 44(5): 826-840.
  GUAN Wenlong, JIANG Youwei, GUO Erpeng, et al. Heavy oil development strategy under the “Carbon Peaking and Carbon Neutrality” target[J]. Acta Petrolei Sinica, 2023, 44(5): 826-840.
[16] 陈欢庆. CO2驱油与埋存技术新进展[J]. 油气地质与采收率, 2023, 30(2): 18-26.
  CHEN Huanqing. New progress of CO2 flooding and storage technology[J]. Petroleum Geology and Recovery Efficiency, 2023, 30(2): 18-26.
[17] 李广超. 国内油田三次采油提高采收率主体技术进展(下)[J]. 油田化学, 2023, 40(1): 175-181.
  LI Guangchao. Progress of main enhanced oil recovery technologies for oilfields in China(Ⅱ)[J]. Oilfield Chemistry, 2023, 40(1): 175-181.
[18] 张继周, 郑强, 亓树成, 等. 火驱稠油开发对油田“双碳”目标实现的影响及分析[J]. 油气田地面工程, 2024, 43(4): 1-6.
  ZHANG Jizhou, ZHENG Qiang, QI Shucheng, et al. Influence and analysis of fire flooding heavy oil development on the realization of “dual carbon” goal in oilfields[J]. Oil-Gas Field Surface Engineering, 2024, 43(4): 1-6.
[19] 陈金星. 溶解CO2稠油的流变性能和驱替效果研究[D]. 东营: 中国石油大学(华东), 2018.
  CHEN Jinxing. Study on rheological properties and displacement effect of dissolved CO2 heavy oil [D]. Dongying: China University of Petroleum (East China), 2018.
[20] 宋新民, 王峰, 马德胜, 等. 中国石油二氧化碳捕集、驱油与埋存技术进展及展望[J]. 石油勘探与开发, 2023, 50(1): 206-218.
  SONG Xinmin, WANG Feng, MA Desheng, et al. Progress and prospect of carbon dioxide capture, utilization and storage in CNPC oilfields[J]. Petroleum Exploration and Development, 2023, 50(1): 206-218.
[21] 邹斌, 于田田, 王善堂, 等. CO2与胜利稠油相互作用微观机理研究[J]. 化学工程与装备, 2011, (6): 1-3.
  ZOU Bin, YU Tiantian, WANG Shantang, et al. Study on microscopic mechanism of interaction between CO2 and Shengli heavy oil[J]. Chemical Engineering & Equipment, 2011, (6): 1-3.
[22] 范盼伟, 朱维耀, 林吉生, 等. 超临界CO2萃取稠油影响因素及规律研究[J]. 科学技术与工程, 2017, 17(6): 31-36.
  FAN Panwei, ZHU Weiyao, LIN Jisheng, et al. Factors and regularity of supercritical CO2 extraction of heavy oil impact[J]. Science Technology and Engineering, 2017, 17(6): 31-36.
[23] 刘经纬, 黄亮, 仲学哲, 等. 超临界CO2对稠油物理化学性质影响实验: 以G24-P21井为例[J]. 石油地质与工程, 2020, 34(4): 84-89.
  LIU Jingwei, HUANG Liang, ZHONG Xuezhe, et al. Experimental study on the effect of supercritical CO2 on the physicochemical properties of heavy oil: By taking G24-P21 well as an example[J]. Petroleum Geology and Engineering, 2020, 34(4): 84-89.
[24] 葛薇. S7区块致密储层复杂缝网模拟及CO2吞吐参数优选[D]. 大庆: 东北石油大学, 2023.
  GE Wei. Simulation of complex fracture network and optimization of CO2 huff-n-puff parameters for compact reservoir in block S7[D]. Daqing: Northeast Petroleum University, 2023.
[25] 赵红妍. 不同类型稠油油藏CO2吞吐提效工程参数优化研究[D]. 北京: 中国石油大学(北京), 2023.
  ZHAO Hongyan. Optimization of CO2 huff and puff efficiency improvement engineering parameters in different types of heavy oil reservoirs[D]. Beijing: China University of Petroleum(Beijing), 2023.
[26] 张朝富, 刘滨, 蒲玉娥, 等. 稠油油藏CO2吞吐参数优化[J]. 新疆石油地质, 2011, 32(5): 528-530.
  ZHANG Chaofu, LIU Bin, PU Yu’e, et al. Optimization of CO2 huff and puff parameter of heavy oil reservoirs[J]. Xinjiang Petroleum Geology, 2011, 32(5): 528-530.
[27] 史英, 盖长城, 颜菲, 等. 稠油油藏CO2吞吐合理吞吐轮次[J]. 大庆石油地质与开发, 2017, 36(1): 129-133.
  SHI Ying, GAI Changcheng, YAN Fei, et al. Reasonable cyclic times of CO2 huff and puff for heavy oil reservoirs[J]. Petroleum Geology & Oilfield Development in Daqing, 2017, 36(1): 129-133.
[28] 张超. 超临界CO2对油藏物性影响规律的研究[D]. 东营: 中国石油大学(华东), 2012.
  ZHANG Chao. Study on the effect of supercritical CO2 on the physical properties of reserves[D]. Dongying: China University of Petroleum (East China), 2012.
[29] 敖文君, 赵仁保, 黎慧, 等. CO2在原油与盐水中的溶解扩散规律研究[J]. 复杂油气藏, 2019, 12(3): 51-55.
  AO Wenjun, ZHAO Renbao, LI Hui, et al. Solution-diffusion law of CO2 in crude oil and brine[J]. Complex Hydrocarbon Reservoirs, 2019, 12(3): 51-55.
[30] 李东东, 侯吉瑞, 赵凤兰, 等. 二氧化碳在原油中的分子扩散系数和溶解度研究[J]. 油田化学, 2009, 26(4): 405-408.
  LI Dongdong, HOU Jirui, ZHAO Fenglan, et al. Study of molecular diffusion coefficients and solubility of carbon dioxide in a Jinlin crude oil[J]. Oilfield Chemistry, 2009, 26(4): 405-408.
[31] 王志兴, 侯吉瑞, 李妍, 等. 气体在原油中扩散系数影响因素研究进展[J]. 油田化学, 2019, 36(3): 558-563.
  WANG Zhixing, HOU Jirui, LI Yan, et al. Proceedings of influencing factors of gas diffusion coefficient in crude oil[J]. Oilfield Chemistry, 2019, 36(3): 558-563.
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