Experimental Study on Two-Dimensional Physical Simulation of CO 2 Flooding in Daqingzijing Oilfield

Jinlong Li, Sijie He (), Feifei Fang, Yu Zhan, Weixiang Jin, Yue Gong, Chuxiang Xia and Mingda Dong
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Jinlong Li: Research Institute of Exploration and Development, PetroChina Jilin Oilfield Company, Songyuan 138000, China
Sijie He: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Feifei Fang: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Yu Zhan: New Energy Business Department, PetroChina Jilin Oilfield Company, Songyuan 138000, China
Weixiang Jin: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Yue Gong: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Chuxiang Xia: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Mingda Dong: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China

Energies, 2025, vol. 18, issue 5, 1-32

Abstract: As global energy demand continues to grow, the difficulty and cost of extracting oil and gas resources are gradually increasing, making enhanced oil recovery (EOR) one of the key issues in oil and gas field development. CO 2 flooding, as an effective tertiary oil recovery technique, has significant advantages in improving recovery rates due to its ability to significantly reduce crude oil viscosity, increase formation energy, and expand the swept volume. However, the effectiveness of CO 2 flooding is influenced by various factors, including flooding methods, well patterns, and formation parameters. In this study, a two-dimensional high-temperature and high-pressure simulation device was used to simulate the CO 2 flooding process under various flooding methods, including water flooding followed by continuous gas flooding, water–gas alternating flooding, and foam flooding, for two types of injection–production well patterns based on the formation oil parameters of the Hei 125 block in the Daqingzijing Oilfield. The results indicate that during the transition from water flooding to continuous gas flooding, gas breakthrough channels form rapidly, leading to a rapid increase in the produced gas–oil ratio (GOR). Alternatively, alternating injection of gas and liquid can effectively control gas mobility, reduce gas phase permeability, delay gas breakthrough time, and improve oil displacement efficiency. Water–gas alternating flooding forms water–gas slugs, allowing CO 2 to enter the tiny pores to contact crude oil, reducing resistance in the pores, and enhancing crude oil displacement efficiency. Although the foam system can expand the fluid sweep range, excessive gas injection can lead to premature gas breakthrough. Furthermore, the type of injection–production well pattern has a significant impact on the overall reservoir recovery for foam system and gas alternating flooding with a 1:1 ratio; adjusting the well pattern can increase the sweep efficiency and improve ultimate recovery. This study reveals the mechanisms by which different flooding methods and well patterns affect the effectiveness of CO 2 flooding, providing important theoretical and practical guidance for optimizing flooding strategies and improving oil recovery in oil and gas fields. It is of great significance for promoting the application of CO 2 flooding technology in oil and gas field development.

Keywords: Daqingzijing Oilfield; CO 2 flooding; injection–production well pattern; production performance; recovery rate (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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