Law of interaction and mass transfer of CO<sub>2</sub> and crude oil during gas injection huff and puff in low permeability tight reservoirs

Wang Jing; Zhang Hongquan; Ji Zemin; Liu Zilong; Liu Huiqing

doi:10.7623/syxb202501018

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Law of interaction and mass transfer of CO₂ and crude oil during gas injection huff and puff in low permeability tight reservoirs

更新时间：2025-10-10

- Law of interaction and mass transfer of CO₂ and crude oil during gas injection huff and puff in low permeability tight reservoirs
- ACTA PETROLEI SINICA Vol. 46, Issue 1, Pages: 265-278(2025)
- 作者机构：
  
  1. 油气资源与工程全国重点实验室, 中国石油大学(北京),北京,102249
  2. 中国石油大学(北京)石油工程教育部重点实验室,北京,102249
  3. 中国石油勘探开发研究院,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.7623/syxb202501018
  CLC： TE135
- Published Online：15 February 2025，
  
  Published：2025
- 稿件说明：
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王敬, 张洪权, 姬泽敏, 刘子龙, 刘慧卿. 低渗-致密油藏注气吞吐CO

Wang Jing, Zhang Hongquan, Ji Zemin, et al. Law of interaction and mass transfer of CO₂ and crude oil during gas injection huff and puff in low permeability tight reservoirs[J]. Acta petrolei sinica, 2025, 46(1): 265-278.
王敬, 张洪权, 姬泽敏, 刘子龙, 刘慧卿. 低渗-致密油藏注气吞吐CO DOI： 10.7623/syxb202501018.

Wang Jing, Zhang Hongquan, Ji Zemin, et al. Law of interaction and mass transfer of CO₂ and crude oil during gas injection huff and puff in low permeability tight reservoirs[J]. Acta petrolei sinica, 2025, 46(1): 265-278. DOI： 10.7623/syxb202501018.

摘要

微米—纳米级孔隙中CO

与原油的相互作用决定了原油的开发效果

而注CO

吞吐的注排方式则直接影响着二者的相互作用。基于核磁共振与分子模拟相结合的方法

系统研究了不同注排方式下CO

与原油相互作用规律及其对开发的影响特性

分析了注CO

吞吐过程中原油微观动态演化过程及分子作用机制。研究结果表明:在相同的压力变化条件下

线性增压比脉冲增压注入能够获得更好的CO

与原油作用效果

充分的对流传质作用使得CO

与原油相互溶解和混相;对比吐气前与吐气后的原油采出情况

线性降压比脉冲降压排采能更有效地携带出原油

线性增压+线性降压注排组合实验的采收率为37.52 %

高于脉冲增压+脉冲降压注排组合的32.49 % 。此外

建立了注气吞吐CO

—原油相互作用的微观机理模型

明确了CO

与原油的分子间作用力及溶解特性。线性增压注入和线性降压排采时

—原油的促溶效果更佳

—原油交汇点数密度值均高于脉冲增压注入和脉冲降压排采

而溶解度参数差均低于脉冲增压注入和脉冲降压排采

呈现出更好的混溶特性与原油剥离效果。

Abstract

The interaction between CO

and crude oil in micro-nano pores is a decisive factor determining the crude oil development effect

which is directly influenced by the injection and discharge method of CO

huff and puff. Based on the combined use of nuclear magnetic resonance and molecular simulation

the paper systematically investigates the law of the interact

ion between CO

and crude oil under different injection and discharge methods and its influencing characteristics on oil development

and analyzes the micro dynamic evolution process and molecular mechanism of crude oil during CO

injection huff and puff. The findings show that under the same pressure change conditions

linear pressurization injection can achieve better effect of interaction between CO

and crude oil than pulse pressurization injection

and sufficient convective mass transfer effect enable CO

and crude oil to dissolve and be miscible with each other. Through comparison of the crude oil recovery before and after huff

it is found that linear depressurization is more efficient in carrying and discharging crude oil than pulse depressurization extraction. The recovery rate of the injection and discharge combination experiment of linear pressurization and linear depressurization is 37.52 %

which is higher than 32.49 % achieved by the combination of injection and discharge through pulse pressurization and pulse depressurization. In addition

a micro mechanism model has been established for the interaction between CO

and crude oil during gas injection huff and puff

and the intermolecular forces and dissolution characteristics between CO

and crude oil have also been clarified. Under linear pressurization injection and linear depressurization extraction

the solubility promoting effect of CO

- crude oil is better

the number density value of CO

- crude oil intersection points is higher than that of pulse pressurization injection and pulse depressurization extraction

while the difference in solubility parameters is lower than that of pulse pressurization injection and pulse depressurization extraction

showing better miscible characteristics and crude oil stripping effect.

关键词

Keywords

references

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Law of interaction and mass transfer of CO2 and crude oil during gas injection huff and puff in low permeability tight reservoirs

DOI：10.7623/syxb202501018

摘要

Abstract

关键词

Keywords

references

Law of interaction and mass transfer of CO₂ and crude oil during gas injection huff and puff in low permeability tight reservoirs