The potential and mechanism of nonionic polyether surfactants dissolved in CO2 to improve the miscibility of CO2–hydrocarbon systems

Lv, Wei; Gong, Hongyu; Li, Yajun; Li, Zijin; Dong, Mingzhe

doi:10.1016/j.fuel.2022.125012

Cited by 19 publications

(5 citation statements)

References 52 publications

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“…Furthermore, the inclusion of surfactants can significantly decrease the MMP of the CO 2crude oil system, with a reduction range of approximately 2.3− 27.4%. 98 Therefore, numerous domestic and international scholars have conducted extensive experimental studies to verify the effectiveness of adding surfactants to the CO 2 -crude oil system. The following are some of the research findings: Wu et al 99 conducted a study to address the issue of high MMP preventing CO 2 miscible flooding in certain blocks of Zhongyuan Oilfield.…”

Section: Mmp Reducing Techniquesmentioning

confidence: 99%

“…The method of adding surfactants has gained attention due to its small dosage, low economic cost, and wide field application. Furthermore, the inclusion of surfactants can significantly decrease the MMP of the CO 2 -crude oil system, with a reduction range of approximately 2.3–27.4% . Therefore, numerous domestic and international scholars have conducted extensive experimental studies to verify the effectiveness of adding surfactants to the CO 2 -crude oil system.…”

Section: Mmp Reducing Techniquesmentioning

confidence: 99%

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Comprehensive Review of the Determination and Reduction of the Minimum Miscibility Pressure during CO₂ Flooding

Song,

Meng,

Zhang

et al. 2024

ACS Omega

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With the increasing oil demand, more attention has been paid to enhancing oil recovery in old oil fields. CO 2 flooding is popular due to its high oil displacement efficiency and ability to reduce greenhouse gas emissions. Laboratory experiments and on-site application cases have shown that the minimum miscibility pressure has a greater impact on CO 2 flooding than other factors. If the reservoir pressure is below the minimum miscible pressure, then there is CO 2 immiscible flooding. Both theoretical analysis and experimental results show that the recovery rate of CO 2 miscible flooding is 2−5 times higher than that of immiscible flooding. If the reservoir pressure is increased by water flooding before CO 2 injection, it is easily limited by the physical property parameters. Therefore, accurately determining and effectively reducing the minimum mixing pressure has become the focus of research. Currently, there are two types of methods for determining the minimum miscible pressure: experimental and theoretical methods. The experimental method is generally considered more accurate, including the slim tube test, rising bubble apparatus, and vanishing interfacial tension, etc. However, it is worth noting that the minimum miscibility pressure is dynamically changing, and there will be high economic costs if measured repeatedly through experimental methods during reservoir development. Therefore, it is recognized that the minimum mixing pressure can be determined at any time using theoretical calculation of initial data, which will reduce economic and time costs to a high degree. In this paper, the theoretical calculation method is divided into empirical correlation, state equation, and artificial intelligence algorithm. The techniques for reducing the minimum miscibility pressure can be classified into two categories: miscible solvents and surfactant methods. The miscible solvent method can be further divided into monocomponent and polycomponent methods. This paper compares the advantages and disadvantages of the existing techniques for measuring and reducing MMP and selects the best method.

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Section: Mmp Reducing Techniquesmentioning

confidence: 99%

Section: Mmp Reducing Techniquesmentioning

confidence: 99%

Comprehensive Review of the Determination and Reduction of the Minimum Miscibility Pressure during CO₂ Flooding

Song,

Meng,

Zhang

et al. 2024

ACS Omega

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“…After the addition of a surfactant, the solubility of CO 2 in crude oil under high pressure conditions increases, but the increase is not significant. The main reason is that CO 2 is a non-polar substance, while surfactants have the capability to alter the properties of CO 2 , thereby increasing its solubility in crude oil [ 151 , 152 ]. In general, the carbon atoms on the carbon chain of surfactants (C 12 –C 18 ) belong to the light components of crude oil.…”

Section: Research Progress On the Mechanism Of Co 2 ...mentioning

confidence: 99%

Research Progress on Displacement Mechanism of Supercritical CO2 in Low-Permeability Heavy Oil Reservoir and Improvement Mechanism of Displacement Agents

Sun,

Zhang,

Tian

et al. 2023

Molecules

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With the continuous growth of global energy demand and the late stage of conventional oilfield exploitation, the demand for developing and utilizing low-permeability heavy oil reservoirs is becoming increasingly urgent. However, the exploitation of low-permeability heavy oil reservoirs faces many challenges due to their high viscosity, low permeability, and complex geological conditions. To overcome these challenges, researchers have gradually introduced SC-CO2 as an oil displacement agent in the exploitation of heavy oil reservoirs. However, the oil displacement mechanism of SC-CO2 in low-permeability heavy oil reservoirs and its improvement mechanism are still not completely understood. The article provides a detailed study and understanding of the oil displacement mechanism of SC-CO2, which involves the expansion of heavy oil volume through SC-CO2 dissolution. This mechanism reduces the capillary resistance and flow resistance during the oil flow process. The permeation of CO2 disrupts the internal structure and arrangement of heavy oil, reducing its viscosity. CO2 extracts both light and heavy components from the heavy oil, reducing the residual oil saturation. In addition, the mechanism of improving the effect of oil displacement agents such as nanoparticles, polymers, and surfactants on SC-CO2 displacement was also explored. By further exploring the mechanisms and improvement mechanisms of SC-CO2 displacement for heavy oil, it can guide the selection and optimization of oil displacement agents. Furthermore, understanding the mechanism can also provide a theoretical basis for engineering practice and technical innovation. While the research on CO2 flooding is analyzed and evaluated, the obstacles and challenges that still exist at this stage are indicated, and future research work on CO2 in low-permeability heavy oil reservoirs is proposed.

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“…Lv et al [131,132] treated different nonionic polyether surfactants for their solubility in CO 2 and their potential to improve oil-gas miscibility. The results showed that polyoxypropylene alkyl ethers, especially those with low molecular weights and high PO groups, significantly improved the oil-gas miscibility.…”

Section: Reducing Miscibility Pressurementioning

confidence: 99%

Research of CO2-Soluble Surfactants for Enhanced Oil Recovery: Review and Outlook

Liang,

Luo,

Luo

et al. 2023

Molecules

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CO2 foam injection has been shown to be effective under reservoir conditions for enhanced oil recovery. However, its application requires a certain stability and surfactant absorbability on rock surface, and it is also associated with borehole corrosion in the presence of water. Adding surfactants to CO2 can enhance the interaction between CO2 and crude oil and control the CO2 mobility, thereby improving the performance of CO2 flooding. This paper presents a review of the research of CO2-soluble surfactants and their applications. Molecular dynamics simulation is introduced as a tool for analyzing the behavior of the surfactants in supercritical CO2 (scCO2). The applications of CO2-soluble surfactants, including CO2 thickening, reducing miscibility pressure, and generating supercritical CO2 foam, are discussed in detail. Moreover, some opportunities for the research and development of CO2-soluble surfactants are proposed.

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The potential and mechanism of nonionic polyether surfactants dissolved in CO2 to improve the miscibility of CO2–hydrocarbon systems

Cited by 19 publications

References 52 publications

Comprehensive Review of the Determination and Reduction of the Minimum Miscibility Pressure during CO₂ Flooding

Comprehensive Review of the Determination and Reduction of the Minimum Miscibility Pressure during CO₂ Flooding

Research Progress on Displacement Mechanism of Supercritical CO2 in Low-Permeability Heavy Oil Reservoir and Improvement Mechanism of Displacement Agents

Research of CO2-Soluble Surfactants for Enhanced Oil Recovery: Review and Outlook

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The potential and mechanism of nonionic polyether surfactants dissolved in CO2 to improve the miscibility of CO2–hydrocarbon systems

Cited by 19 publications

References 52 publications

Comprehensive Review of the Determination and Reduction of the Minimum Miscibility Pressure during CO2 Flooding

Comprehensive Review of the Determination and Reduction of the Minimum Miscibility Pressure during CO2 Flooding

Research Progress on Displacement Mechanism of Supercritical CO2 in Low-Permeability Heavy Oil Reservoir and Improvement Mechanism of Displacement Agents

Research of CO2-Soluble Surfactants for Enhanced Oil Recovery: Review and Outlook

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Product

Resources

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Comprehensive Review of the Determination and Reduction of the Minimum Miscibility Pressure during CO₂ Flooding

Comprehensive Review of the Determination and Reduction of the Minimum Miscibility Pressure during CO₂ Flooding