Improving oil recovery in the CO2 flooding process by utilizing nonpolar chemical modifiers

Yang, Yong; Li, Xiangliang; Guo, Ping; Zhuo, Yayun; Sha, Yong

doi:10.1016/j.cjche.2015.12.002

Cited by 23 publications

(4 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When conditions such as temperature, pressure, CO 2 concentration, etc., change, the phase behavior of crude oil will also change (e.g., bubble point pressure, volume coefficient, viscosity, gas-liquid composition, and composition), and the minimum miscibility pressure will vary, thereby affecting the efficiency of the oil recovery process [13][14][15][16]. To overcome these challenges, researchers employ co-solvents to regulate the phase behavior between CO 2 and crude oil, enhance the solubility of CO 2 , and promote the miscibility of CO 2 with crude oil, ultimately achieving the goal of increased production [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Tributyl Citrate as a Cosolvent on the Phase Behavior of Crude Oil during CO2 Injection Process

Xue,

Yang,

et al. 2024

Energies

View full text Add to dashboard Cite

The current research on CO2 cosolvent primarily focuses on reducing the minimum miscibility pressure and improving oil recovery. However, investigations into the impact of additive agents on the phase behavior of crude oil during the CO2 injection process are relatively limited. In this study, we introduced tributyl citrate as a cosolvent to the CO2 injection process. By comparing the phase parameters of crude oil and changes in component composition in the residual oil before and after the addition of tributyl citrate, we explored the influence patterns of this cosolvent during CO2 injection. The experiments show that the optimum concentration of tributyl citrate is 0.3%. After the addition of tributyl citrate, the bubble point pressure of crude oil is reduced from 14.28 MPa to 13.36 MPa, and the density is decreased from 1.00 g/cm3 to 0.95 g/cm3. These alterations of bubble point pressure and density indicate an enhanced solubility of CO2 and improved miscibility with the oil, coinciding with an increased volume expansion coefficient rising from 1.12 to 1.18 under 20 MPa and a decrease in viscosity from 0.73 mPa·s to 0.64 mPa·s. Tributyl citrate primarily affects the properties of crude oil by reducing interfacial tension and the content of heavy components in the dissolution system. The addition of tributyl citrate stabilizes the deposition trend of heavy components in crude oil and promotes the transformation of heavy components into light components, thereby enhancing the efficiency of CO2 extraction. This study provides valuable insights into a novel and simple method to further increase oil recovery in the CO2 injection process.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Tributyl Citrate as a Cosolvent on the Phase Behavior of Crude Oil during CO2 Injection Process

Xue,

Yang,

et al. 2024

Energies

View full text Add to dashboard Cite

show abstract

“…Research reagents that have been reported include low carbon alcohol, toluene, benzene, DYJ, methyl carbonate, dimethyl carbonate, diethyl carbonate, sec -butyl acetate, and so on. The most obvious effect is the injection of high concentration of preslug toluene (29 wt %), which can increase the oil displacement efficiency by 25 , The study found that after adding a chemically modified solvent, the CO 2 extraction capacity was increased 3 times . In addition, the use of surfactants to change the properties of oil and gas in the process of CO 2 flooding has gradually become an important research direction.…”

Section: Introductionmentioning

confidence: 99%

Study on Oil and Gas Amphiphilic Surfactants Promoting the Miscibility of CO₂ and Crude Oil

et al. 2021

View full text Add to dashboard Cite

In order to cope with the global climate crisis, carbon capture, utilization, and storage are the key technologies to achieve carbon neutrality, and it is an elegant geological utilization method for the oil and gas industry to improve the recovery rate of crude oil by using CO2. However, in practical applications, the problem of low miscibility of CO2 and crude oil, resulting in low oil displacement efficiency, cannot be avoided. Thus, finding an appropriate method to increase the utilization rate of CO2 is a worth in-depth study. In light of this, this paper carries out the study on improving the CO2 flooding efficiency by using oil and gas amphiphilic surfactants. First of all, according to the molecular structure theory and the solubility experiment of surfactants in CO2, five kinds of surfactants and two kinds of additives with good performance of oil and gas were selected. Then, three experiments were conducted to explore the mechanism of the selected surfactants. The main mechanism of promoting the miscibility of CO2–crude oil is to reduce the interfacial tension of the oil and gas phases, followed by increasing the volume expansion of crude oil and reducing the viscosity of crude oil. Finally, through the slim tube displacement experiment, the oil displacement efficiency effect of adding the compound systems of SPO5/n-pentanol was simulated. The results show that the oil displacement efficiency is significantly higher than that of pure CO2 flooding, and the pressure of miscibility reduces at the same time. The selected reagents have a good effect of promoting miscibility. Therefore, this is an effective method to improve the geological utilization of CO2.

show abstract

“…[8][9][10][11] The dissolution of CO 2 in crude oil and the resulting volume expansion are considered to be the two major mechanisms responsible for improving oil recovery. [12][13][14][15][16] It is well known that both supercritical uid extraction and CO 2 ooding are essentially equilibrium processes that occur between CO 2 and organic liquid systems under high temperatures and high pressures. Therefore, many researchers have studied the CO 2 -organic liquid phase and accumulated various experimental data on the phases of CO 2 and the organic liquid systems.…”

Section: Introductionmentioning

confidence: 99%

Investigation on dispersion properties of CO₂and ester solvent mixtures usingin situFTIR spectroscopy

et al. 2020

View full text Add to dashboard Cite

show abstract

Improving oil recovery in the CO2 flooding process by utilizing nonpolar chemical modifiers

Cited by 23 publications

References 12 publications

Effect of Tributyl Citrate as a Cosolvent on the Phase Behavior of Crude Oil during CO2 Injection Process

Effect of Tributyl Citrate as a Cosolvent on the Phase Behavior of Crude Oil during CO2 Injection Process

Study on Oil and Gas Amphiphilic Surfactants Promoting the Miscibility of CO₂ and Crude Oil

Investigation on dispersion properties of CO₂and ester solvent mixtures usingin situFTIR spectroscopy

Contact Info

Product

Resources

About

Improving oil recovery in the CO2 flooding process by utilizing nonpolar chemical modifiers

Cited by 23 publications

References 12 publications

Effect of Tributyl Citrate as a Cosolvent on the Phase Behavior of Crude Oil during CO2 Injection Process

Effect of Tributyl Citrate as a Cosolvent on the Phase Behavior of Crude Oil during CO2 Injection Process

Study on Oil and Gas Amphiphilic Surfactants Promoting the Miscibility of CO2 and Crude Oil

Investigation on dispersion properties of CO2and ester solvent mixtures usingin situFTIR spectroscopy

Contact Info

Product

Resources

About

Study on Oil and Gas Amphiphilic Surfactants Promoting the Miscibility of CO₂ and Crude Oil

Investigation on dispersion properties of CO₂and ester solvent mixtures usingin situFTIR spectroscopy