CO2驱气机理与提高采收率评价模型

doi:10.13809/j.cnki.cn32-1825/te.2022.05.004

摘要/Abstract

摘要：

中国天然气探明储量巨大,但实现天然气长期规模稳产,面临复杂气藏提高采收率等系列挑战,尤以页岩气、煤层气和致密气等非常规资源为甚。碳中和背景下,驱气类CCUS（碳捕集、利用与封存）技术具有广阔应用前景。将CO₂驱提高天然气藏采收率的主要机理总结为优势吸附置换、连续对流排驱、补充气藏能量3种类型,并认为吸附态、游离态和溶解态这3种天然气的赋存状态划分适用于所有类型气藏,推导获得了CO₂驱提高气藏采收率效果预测方法。应用该方法进行测算认为,CO₂驱有望提高页岩气采收率20个百分点以上。为突破大幅度提高天然气采收率技术,建议针对具有较好碳封存条件的气藏开展CO₂驱提高天然气采收率潜力评价,优选目标气藏进行经济可行性评估,并开展多种类型的CO₂驱提高气藏采收率重大开发试验,检验烟气组分协同驱替效果和扩大CO₂波及体积技术。

关键词: 非常规气藏, CO₂驱气机理, 提高采收率评价模型, 重大开发试验, 烟气组分协同驱替, 扩大波及体积

Abstract:

The proved reserves of natural gas in place in China is huge. However, realizing the long-term large scale stable production of natural gas faces a series of challenges such as enhanced gas recovery（EGR） of complex gas reservoirs, especially for those unconventional resources such as shale gas, coalbed methane and tight sand gas. Under the background of carbon neutralization, CCUS-EGR technology has broad application prospects due to owing the functions of increasing gas rate and carbon reduction. The main EGR mechanisms for CO₂ flooding are summarized into three types: substitution due to dominant adsorption of carbon dioxide, continuous convective displacement and gas reservoir energy supplement. Under the consideration that the classification of occurrence states of the adsorbed, free and dissolved natural gas are applicable to all types of the gas reservoirs. The prediction method of increased natural gas ultimate recovery factor by CO₂ flooding is further deduced. It is found that CO₂ flooding is expected to improve shale gas recovery of more than 20 percentage points by this method. In order to break through the technology of greatly improving natural gas recovery, it is suggested to evaluate the potential of CO₂ flooding to improve natural gas recovery for gas reservoirs with good geological sequestration conditions, assess the economic feasibility of CCUS-EGR technology applying in target gas reservoirs, and carry out major pilot tests of CO₂ flooding in various types of gas reservoirs. The synergistic displacement effect of flue gas components and the technology of expanding CO₂ sweeping volume should be focused especially.

Key words: unconventional gas reservoir, mechanism of CO₂ flooding, calculation model of CO₂ EGR, key field pilot test, collaborative displacement of flue gas component, expanding sweeping volume

中图分类号:

TE357

王高峰, 廖广志, 李宏斌, 胡志明, 魏宁, 丛连铸. CO₂驱气机理与提高采收率评价模型[J]. 油气藏评价与开发, 2022, 12(5): 734-740.

WANG Gaofeng, LIAO Guangzhi, LI Hongbin, HU ZhiMing, WEI Ning, CONG Lianzhu. Mechanism and calculation model of EOR by CO₂ flooding[J]. Reservoir Evaluation and Development, 2022, 12(5): 734-740.

图/表 6

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CO₂驱气机理与提高采收率评价模型

Mechanism and calculation model of EOR by CO₂ flooding

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