CO2交替烷烃气吞吐提高致密油采收率实验

doi:10.3969/j.issn.1006-6535.2025.03.009

特种油气藏 ›› 2025, Vol. 32 ›› Issue (3): 76-85.DOI: 10.3969/j.issn.1006-6535.2025.03.009

CO₂交替烷烃气吞吐提高致密油采收率实验

李志浩, 皮彦夫, 刘丽, 杨佳雯, 蔡冬蕊

东北石油大学,黑龙江大庆 163318

收稿日期:2024-01-31 修回日期:2025-02-17 出版日期:2025-06-25 发布日期:2025-07-08
通讯作者: 皮彦夫(1976—),男,研究员,2002年毕业于大庆石油学院石油工程专业,2014年毕业于东北石油大学石油与天然气工程专业,获博士学位,现从事提高油气采收率理论与技术方面的研究工作。
作者简介:李志浩(1999—),男,2021年毕业于东北石油大学石油工程专业,现为该校石油与天然气工程专业在读博士研究生,主要从事CO₂驱提高采收率方面的研究。
基金资助:
国家自然科学基金“低渗砂岩储层水盾对CO₂-原油最小混相压力的影响机理与规律”(52174023);黑龙江省自然科学基金“低渗砂岩油藏水盾阻隔效应对CO₂-原油MMP影响机理”(LH2021E015)

Experimental study on enhancing tight oil recovery by CO₂-alternating-alkane huff-n-puff

LI Zhihao, PI Yanfu, LIU Li, YANG Jiawen, CAI Dongrui

Northeast Petroleum University,Daqing,Heilongjiang 163318,China

Received:2024-01-31 Revised:2025-02-17 Online:2025-06-25 Published:2025-07-08

摘要/Abstract

摘要： 针对气体吞吐后期单周期采收率降低,累计采收率增幅减缓的问题,选取CO₂、甲烷、乙烷、丙烷,利用高温高压反应釜开展萃取实验,利用气相色谱测定不同气体萃取的原油组分,结合萃取后剩余油黏度变化,比较了不同气体对原油的分子质量选择性,开展CO₂吞吐和CO₂交替烷烃吞吐实验,对比了不同注入方式提高采收率的效果。实验结果表明:丙烷对原油的萃取率最高,在30 MPa时能够达到62.60%,乙烷和CO₂在30 MPa时对原油的萃取率分别为53.07%和49.25%,甲烷的萃取能力最差,在30 MPa时仅为20.47%;丙烷对原油的分子质量选择最为均匀,能够萃取原油中所有组分,乙烷则对轻质组分和中质组分的选择性更强,主要萃取C₂₅以内的组分,而CO₂和甲烷主要萃取C₁₅以内的轻质组分;CO₂交替烷烃吞吐较单纯CO₂吞吐提高采收率10.0个百分点以上,并且吞吐后期各周期采收率也得到了显著提高。研究成果对提高致密油采收率具有一定借鉴意义。

关键词: 致密油, 气体吞吐, 分子质量选择性, 提高采收率, 萃取率

Abstract: To address the decline in single-cycle recovery and the slowdown in cumulative recovery increase during the later stage of gas huff-n-puff,CO₂,methane,ethane,and propane were selected to carry out extraction experiments using a high-temperature and high-pressure reactor,and gas chromatography was employed to determine the oil components extracted with different gases.Combined with the viscosity changes of the remaining oil after extraction,the molecular mass selectivity of different gases was compared.Moreover, CO₂ huff-n-puff and CO₂-alternating-alkane huff-n-puff experiments were conducted to evaluate the recovery enhancement effects of different injection methods.The experiments revealed that propane has the highest extraction rate,reaching 62.60% at 30 MPa,ethane andCO₂ achieve 53.07% and 49.25% respectively at 30 MPa,and methane has the poorest extraction ability,only 20.47% at 30 MPa.Propane shows the most uniform molecular mass selectivity,extracting all oil components,and ethane preferentially extracts light and medium components,mainly those within C₂₅,while CO₂ and methane mainly extract light components within C₁₅.The huff-n-puff experimental results showed that CO₂-alternating-alkane huff-n-puff enhances recovery by over 10% compared to CO₂-only huff-n-puff,with significant improvements in later-stage recovery per cycle.This research offers valuable insights for enhancing tight oil recovery.

Key words: tight oil, gas huff-n-puff, molecular mass selectivity, recovery enhancement, extraction rate

中图分类号:

TE135

李志浩, 皮彦夫, 刘丽, 杨佳雯, 蔡冬蕊. CO₂交替烷烃气吞吐提高致密油采收率实验[J]. 特种油气藏, 2025, 32(3): 76-85.

LI Zhihao, PI Yanfu, LIU Li, YANG Jiawen, CAI Dongrui. Experimental study on enhancing tight oil recovery by CO₂-alternating-alkane huff-n-puff[J]. Special Oil & Gas Reservoirs, 2025, 32(3): 76-85.

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CO₂交替烷烃气吞吐提高致密油采收率实验

Experimental study on enhancing tight oil recovery by CO₂-alternating-alkane huff-n-puff

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