首页|Investigation of gravity influence on EOR and CO2 geological storage based on pore-scale simulation

Investigation of gravity influence on EOR and CO2 geological storage based on pore-scale simulation

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Gravity assistance is a critical factor influencing CO2-oil mixing and miscible flow during EOR and CO2 geological storage.Based on the Navier-Stokes equation,component mass conservation equation,and fluid property-composition relationship,a mathematical model for pore-scale CO2 injection in oil-saturated porous media was developed in this study.The model can reflect the effects of gravity assis-tance,component diffusion,fluid density variation,and velocity change on EOR and CO2 storage.For non-homogeneous porous media,the gravity influence and large density difference help to minimize the velocity difference between the main flow path and the surrounding area,thus improving the oil re-covery and CO2 storage.Large CO2 injection angles and oil-CO2 density differences can increase the oil recovery by 22.6%and 4.2%,respectively,and increase CO2 storage by 37.9%and 4.7%,respectively.Component diffusion facilitates the transportation of the oil components from the low-velocity region to the main flow path,thereby reducing the oil/CO2 concentration difference within the porous media.Component diffusion can increase oil recovery and CO2 storage by 5.7%and 6.9%,respectively.In addi-tion,combined with the component diffusion,a low CO2 injection rate creates a more uniform spatial distribution of the oil/CO2 component,resulting in increases of 9.5%oil recovery and 15.7%CO2 storage,respectively.This study provides theoretical support for improving the geological CO2 storage and EOR processes.

GravityFlow simulationCO2-oil mixingEnhanced oil recovery(EOR)Geological storage

Yong-Mao Hao、Gui-Cheng Wu、Zong-Fa Li、Zhong-Hui Wu、Yong-Quan Sun、Ran Liu、Xing-Xing Li、Bo-Xin Pang、Nan Li

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Key Laboratory of Unconventional Oil & Gas Development(China University of Petroleum(East China)),Ministry of Education,Qingdao,266580,Shandong,China

School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,266580,Shandong,China

School of Petroleum Engineering,Yangtze University,Wuhan 430100,Hubei,China

Dongsheng Jinggong Petroleum Development Group Co.,Ltd,Shengli Oilfield Company,SINOPEC,Dongying,257001,Shandong,China

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国家自然科学基金国家自然科学基金Major Scientific and Technological Projects of CNPC

5199136451974347ZD2019-184-002

2024

石油科学(英文版)
中国石油大学(北京)

石油科学(英文版)

EI
影响因子:0.88
ISSN:1672-5107
年,卷(期):2024.21(2)
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