Significance of polymer on emulsion stability in surfactant‐polymer flooding

Xuan, Yinglong; Ma, Dawei; Zhou, Minghui; Gao, Ming

doi:10.1002/app.42171

Cited by 12 publications

(7 citation statements)

References 29 publications

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“…46 Degradation of polymers is crucial for polymer flooding to improve crude oil recovery, because polymer degradation decreases polymer solution viscosity and leads to an increase in water-oil viscosity ratio, thus seriously impacting polymer flooding effectiveness. 47,48 The researchers investigated polymer degradation under static conditions and different reservoir conditions. 49,50 These studies were mainly based on xanthan gum and polyacrylamide, and the results showed that the viscosity was only a little higher than that of water after mechanical shear degradation.…”

Section: Introductionmentioning

confidence: 99%

Simulated evaluation of the degradation of hydrophobically associative polymers in the formation

Qi,

Shu,

Luo

2023

J of Applied Polymer Sci

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In this work, indoor physical simulation experiments were used to examine the effects of shear, thermal, chemical, and microbial degradation on the properties of the hydrophobic associative polymer AP‐P4. It was discovered that the viscosity of the polymer solution generally decreased as the shear time was extended. The larger the shear strength, the lower the solution viscosity. Fitting of the nonlinear equation of solution viscosity with shear time, η = 12,988 t−1.08. When thermal degradation started, the solution viscosity first started to rise, however, this phase was just a short one. The viscosity of the solution gradually started to decrease as the thermal degradation period grew. In addition, the trends of properties like hydrokinetic radius, hydrophobic connectivity, and hydrolysis essentially followed the same patterns as those of solution viscosity. At the beginning of the degradation process, the viscosity retention of the polymer solution without oxygen is significantly higher than that of the aerobic environment. However, the difference between the two becomes smaller as the degradation time increases. In addition, the AP‐P4 had good temperature resistance and aging resistance capabilities when iron ions were present. Finally, it was discovered that AP‐P4 had a strong antibacterial effect, which decreased the viscosity brought on by microbial action.

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Section: Introductionmentioning

confidence: 99%

Simulated evaluation of the degradation of hydrophobically associative polymers in the formation

Qi,

Shu,

Luo

2023

J of Applied Polymer Sci

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“…9,10 However, after these two stages of oil recovery, more than 50% of the crude oil is waiting to be developed. 11,12 Therefore, a tertiary oil recovery technology called chemical flooding, which has a higher oil recovery efficiency than primary oil recovery and secondary oil recovery, is gradually emerging. 13,14 It includes thermal flooding, gas flooding, and chemical flooding.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of oil recovery by surfactant-polymer synergy flooding: A review

Yao

Zhong

et al. 2022

Polymers and Polymer Composites

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With the depletion of conventional resources, it is necessary to enhance the recovery of remaining oil. The tertiary oil recovery chemical flooding is the most promising for enhanced oil recovery (EOR). The use of alkali in chemical flooding produces fouling with the formation, which brings new challenges to chemical flooding EOR. So, alkali-free surfactant-polymer (SP) flooding is used as a new solution for EOR. The polymer makes the displacing fluid have a high viscosity and increases the swept volume. The surfactant can decrease the interfacial tension and emulsify the crude oil while the displacing fluid reaches the corresponding area. The synergistic effect of the two is more conducive to the recovery of the remaining oil. As a result, SP flooding is a more practical approach to enhance oilfield EOR. The research status of several surfactant and polymer types for EOR is reported in this work. According to the study, complex and anionic surfactants are better for EOR. For difficult formations, SP flooding is more suited because of the presence of polymers. Additionally, study analysis demonstrates that SP flooding and alternative polymer injection, when employed at the same cost, can enhance EOR and assist in resolving issues brought on by low oil prices.

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“…The results showed that the alkali solution penetrated into the crude oil and formed a W/O emulsion with the crude oil, which reduced the flow capacity of the water phase and increased the sweep efficiency. In 2015, Xuan 17 studied the effect of polymers on emulsion stability in poly-surface binary composite flooding. The polymer was found to be beneficial to the stability of the emulsion.…”

Section: Introductionmentioning

confidence: 99%

Testing and Evaluation of the Emulsifying Properties of Compound Oil Displacement Agents

Zhang

Wang

et al. 2022

ACS Omega

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Aiming at the phenomenon that the emulsification degree of the composite oil displacement agents affects the recovery factor, composite oil displacement agents of the P/S binary system and the A/S/P ternary system were taken as research objects. Emulsion particle size and stability were tested and evaluated, and the effects of the surfactant and alkali content on the emulsification degree of emulsion were investigated. The concept of the emulsification stability index and its measuring method were put forward, and a method was used to test and evaluate the emulsification stability of the emulsion. The results showed that the emulsion formed by the ternary system had the smallest average particle size, the best stability, and the best emulsification stability. The binary composite system was second, and the polymer solution did not form an emulsion. The emulsification stability index method could effectively quantify the emulsification degree of the emulsion. Within a certain range, the increase of the surfactant and alkali content in the composite oil displacement agent was beneficial to the improvement of the emulsification degree of the emulsion.

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Significance of polymer on emulsion stability in surfactant‐polymer flooding

Cited by 12 publications

References 29 publications

Simulated evaluation of the degradation of hydrophobically associative polymers in the formation

Simulated evaluation of the degradation of hydrophobically associative polymers in the formation

Enhancement of oil recovery by surfactant-polymer synergy flooding: A review

Testing and Evaluation of the Emulsifying Properties of Compound Oil Displacement Agents

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