油气藏评价与开发 ›› 2024, Vol. 14 ›› Issue (6): 975-980.doi: 10.13809/j.cnki.cn32-1825/te.2024.06.020

• 综合研究 • 上一篇    下一篇

CO2驱气提高采收率机理及发展方向

朱浩楠1,2(), 曹成1,2(), 张烈辉1,2, 赵玉龙1,2, 彭先3, 赵梓寒3, 陈星宇1,2   

  1. 1.西南石油大学油气藏地质及开发工程全国重点实验室,四川 成都 610500
    2.西南石油大学碳中和研究院,四川 成都 610500
    3.中国石油西南油气田公司勘探开发研究院,四川 成都 610041
  • 收稿日期:2023-09-05 发布日期:2024-12-10 出版日期:2024-12-26
  • 通讯作者: 曹成 E-mail:1025771222@qq.com;caochengcn@163.com
  • 作者简介:朱浩楠(2001—),男,在读硕士研究生,从事碳捕集、利用与封存(CCUS)等研究。地址:四川省成都市新都区新都大道8号,邮政编码:610500。E-mail: 1025771222@qq.com
  • 基金资助:
    国家自然科学基金项目“四川盆地有水气藏CO2驱提高采收率及其有效封存研究”(U23A2022);四川省科技计划项目“非纯二氧化碳在枯竭气藏中的运移规律及封存机制研究”(2022JDRC0098)

Mechanism and development direction of CO2-EGR

ZHU Haonan1,2(), CAO Cheng1,2(), ZHANG Liehui1,2, ZHAO Yulong1,2, PENG Xian3, ZHAO Zihan3, CHEN Xingyu1,2   

  1. 1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    2. Institute of Carbon Neutrality, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    3. Exploration and Development Research Institute, PetroChina Southwest Oil & Gas Field Company, Chengdu, Sichuan 610041, China
  • Received:2023-09-05 Online:2024-12-10 Published:2024-12-26
  • Contact: CAO Cheng E-mail:1025771222@qq.com;caochengcn@163.com

摘要:

向枯竭气藏内注入CO2,能够同时实现提高采收率与CO2地质封存,在“双碳”背景下具有广阔应用前景。目前,CO2-EGR(CO2驱气提高采收率)总体上尚处于理论研究阶段,针对其机理不明晰的问题,综述了不同气藏CO2-EGR机理。对于常规气藏,其作用机理包括压力恢复及驱替作用、重力分异作用、黏度差异辅助驱替作用、溶蚀改造储层作用;对于凝析气藏能够保压开采,还具有降低黏度作用、溶解膨胀作用、萃取解堵作用;对于页岩气藏、煤层气藏、致密气藏,更具备优势吸附置换作用;对于有水气藏,注CO2则能够有效抑制水侵的发生。各提高采收率机理对不同类型气藏的贡献程度也不尽相同。CO2-EGR已在理论层面证明了其可行性,为进一步实现其现场应用,还需在混合气体相态特征、扩散与气体混合机制、提高采收率潜力评价、提高采收率机理表征等方面攻克难关。研究表明:在枯竭气藏中注入CO2,可以恢复地层压力补充地层能量,由于物性差异形成较稳定驱替过程,在多种机理共同作用下实现提高采收率,是一种极具潜力的增产方法。

关键词: 碳捕集、利用与封存, CO2驱, 提高采收率, 机理综述, 天然气

Abstract:

Injecting CO2 into depleted gas reservoirs can simultaneously achieve enhanced oil recovery and CO2 geological storage, offering broad application prospects under the "dual carbon" background. Currently, CO2-EGR(CO2 enhanced gas recovery) is still largely in the theoretical research phase. To address the unclear mechanisms, this review summarizes the mechanisms of CO2-EGR in different gas reservoirs. For conventional gas reservoirs, the mechanisms include pressure restoration and displacement effects, gravity segregation, viscosity-difference-assisted displacement, and dissolution-enhanced reservoir modification. For condensate gas reservoirs, pressure-maintained production is possible, along with viscosity reduction, dissolution expansion, and extraction-deblocking effects. For shale gas, coalbed methane, and tight gas reservoirs, the adsorption displacement effect is more significant. In water-bearing gas reservoirs, injecting CO2 can effectively inhibit water invasion. The contributions of each enhanced recovery mechanism to different types of gas reservoirs vary. CO2-EGR has been proven feasible at the theoretical level, but to achieve field application, further breakthroughs are needed in several areas, including gas phase characteristics of mixed gases, diffusion and gas mixing mechanisms, enhanced recovery potential evaluation, and characterization of enhanced recovery mechanisms. Research shows that injecting CO2 into depleted gas reservoirs can restore formation pressure and replenish formation energy. Due to physical property differences, a stable displacement process is formed, achieving enhanced recovery under the combined action of multiple mechanisms. It is a highly promising method for increasing production.

Key words: CCUS, CO2 flooding, EGR(enhanced gas recovery), mechanism review, natural gas reservoir

中图分类号: 

  • TE357