Insight into the behavior of colloidal gas aphron (CGA) fluids at elevated pressures: An experimental study

Pasdar, M.; Kazemzadeh, Ezatallah; Kamari, Ehsan; Ghazanfari, Mohammad Hossein; Soleymani, Mohammad

doi:10.1016/j.colsurfa.2017.10.001

Cited by 15 publications

(4 citation statements)

References 12 publications

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“…This thin film is made of surfactant molecules and has three layers [18]. The addition of XG polymer increases the viscosity of the outer film and so strengthens the aphron structure such that the foam can endure harsh conditions such as high pressure and temperature [45].…”

Section: Visualization Of Co2 Microbubblesmentioning

confidence: 99%

“…Bjorndalen [22] visually assessed the stability of CGAs and the corresponding bubble sizes at high pressures and found that the foams were stable but that the microbubble size decreased with increasing pressure up to 3.4 MPa. Pasdar et al [23] investigated CGAs during compression and decompression and reported that these materials were stable up to 13.7 MPa, while Bjorndalen [22] showed that CGAs became unstable at temperatures ranging from 50 to 75 °C.…”

Section: Introductionmentioning

confidence: 99%

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Bubble size distribution and stability of CO₂ microbubbles for enhanced oil recovery: effect of polymer, surfactant and salt concentrations

Sugai

Nguele

et al. 2021

Journal of Dispersion Science and Technology

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Fluids incorporating carbon dioxide (CO2) microbubbles have been utilized to promote enhanced oil recovery from hydrocarbon reservoirs. The performance of such fluids in porous media is greatly affected by both the bubble size and stability. On this basis, the present study evaluated the effects of varying the concentrations of a xanthan gum (XG) polymer, a surfactant (sodium dodecyl sulfate: SDS) and sodium chloride (NaCl) on both the stability and bubble size distribution (BSD) of CO2 microbubbles. CO2 microbubble dispersions were prepared using a high-speed homogenizer in conjunction with the diffusion of gaseous CO2 through aqueous solutions. The stability of each dispersion was ascertained using a drainage test, while the BSD was determined by optical microscopy and fitted to either normal, log-normal or Weibull functions. The results showed that a Weibull distribution gave the most accurate fit for all experimental data. Increases in either the SDS or XG polymer concentration were found to decrease the microbubble size.However, these same changes increased the microbubble stability as a consequence of structural enhancement. The addition of NaCl up to a concentration of 10 g/L (10g/1000g) decreased the average bubble size by approximately 2.7%. Stability was also reduced as the NaCl concentration was increased because of the gravitational effect and coalescence.

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Section: Visualization Of Co2 Microbubblesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bubble size distribution and stability of CO₂ microbubbles for enhanced oil recovery: effect of polymer, surfactant and salt concentrations

Sugai

Nguele

et al. 2021

Journal of Dispersion Science and Technology

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“…SDS is a frequently used surfactant for making CGAs [10,25]. But its anionic nature is a reason to be affected by the presence of ions in the system.…”

Section: Influence Of Nacl On Sds Made Cgasmentioning

confidence: 99%

Salt Effects on Formation and Stability of Colloidal Gas Aphrons Produced by Anionic and Zwitterionic Surfactants in Xanthan Gum Solution

Keshavarzi

Mahmoudvand

Javadi

et al. 2020

Colloids and Interfaces

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This work is devoted to the influence of NaCl salt concentration on the formation and stability of colloidal gas aphrons (CGA) produced by the anionic surfactant sodium dodecyl sulfate (SDS) and zwitterionic surfactant coco amido propyl betaine (CAPB) in the presence of xanthan gum (XG) as a stabilizer. Dynamic surface tension measurements as well as volume and half-life time of the produced foams are considered for stability analysis. A sharp decrease of the half-life time and volume of the CGAs at NaCl concentrations larger than 20,000 ppm was observed, which was attributed to the precipitation of SDS in the solution. The mentioned SDS precipitation altered the dynamic surface tension behavior, dilational surface elasticity, and turbidity of the solution. The main reason for the precipitation of SDS is the increased Krafft point caused by the addition of salt. However, for the zwitterionic surfactant CAPB, the effects of added NaCl on the interfacial properties required for CGAs production was negligible due to the simultaneous effects on the cationic and anionic head groups in the CAPB leading to negligible changes in the net repulsion forces. Yet, an overall reduction in the half-life time of CGAs with increasing salt concentration, even when we have no precipitation, was observed for both surfactants, which could be explained by the reduction in the ability of XG to increase the viscosity with increasing salt concentration.

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“…Moreover, aphrons can be cleaned up to the ground easily in the production stage, which can reduce the cost associated with stimulation processes. CGA drilling fluids also presents several advantages such as high cutting carrying capacity and an increase in drilling speed [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Study on the Rheological Properties of Ultra-High Temperature CGA Drilling Fluids

Zhu

Zheng

2021

Advances in Transdisciplinary Engineering

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Colloidal gas aphron (CGA) drilling fluids are a kind of environmentally-friendly underbalanced drilling technique, which has attracted more attention in depleted reservoirs and other low-pressure areas. With the shortage of global oil/gas resources, drilling has gradually shifted to high-temperature and deep wells. Hence, a study on the ultra-high temperature rheology properties of CGA fluids is lacking and urgently needed. In this study, a novel CGA drilling fluid system was prepared by modified starch and amino acid surfactant, and rheological properties after 120-300°C aged was investigate. Results show that: (1) Herschel-Bulkley model is the preferred model to predict CGA drilling fluid at ultra-high temperatures; (2) It was proved that CGA drilling fluid is a high-quality drilling fluid with extremely high value of LSRV and shear thinning property within 280°C. Compared to the traditional XG-based CGA drilling fluid, the improvement of LSRV at ultra-high temperatures is a significant advantage of EST-based CGA drilling fluid which is conducive to carrying cuttings and sealing formation pores.

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Insight into the behavior of colloidal gas aphron (CGA) fluids at elevated pressures: An experimental study

Cited by 15 publications

References 12 publications

Bubble size distribution and stability of CO₂ microbubbles for enhanced oil recovery: effect of polymer, surfactant and salt concentrations

Bubble size distribution and stability of CO₂ microbubbles for enhanced oil recovery: effect of polymer, surfactant and salt concentrations

Salt Effects on Formation and Stability of Colloidal Gas Aphrons Produced by Anionic and Zwitterionic Surfactants in Xanthan Gum Solution

Study on the Rheological Properties of Ultra-High Temperature CGA Drilling Fluids

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Insight into the behavior of colloidal gas aphron (CGA) fluids at elevated pressures: An experimental study

Cited by 15 publications

References 12 publications

Bubble size distribution and stability of CO2 microbubbles for enhanced oil recovery: effect of polymer, surfactant and salt concentrations

Bubble size distribution and stability of CO2 microbubbles for enhanced oil recovery: effect of polymer, surfactant and salt concentrations

Salt Effects on Formation and Stability of Colloidal Gas Aphrons Produced by Anionic and Zwitterionic Surfactants in Xanthan Gum Solution

Study on the Rheological Properties of Ultra-High Temperature CGA Drilling Fluids

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Bubble size distribution and stability of CO₂ microbubbles for enhanced oil recovery: effect of polymer, surfactant and salt concentrations

Bubble size distribution and stability of CO₂ microbubbles for enhanced oil recovery: effect of polymer, surfactant and salt concentrations