Asphaltene deposition in porous media micromodels: experimental studies and comprehensive permeability-reducing mechanisms

Mahmoudi, Maedeh; Esmaeilian, Nima; Zokaee Ashtiyani, Farzin; Dabir, Bahram

doi:10.22050/ijogst.2022.327070.1626

Document Type : Research Paper

Authors

¹ M.S. Student, Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran

² Ph.D., Instructor, Department of Textile Engineering, Amirkabir University of Technology, Tehran, Iran

³ Professor, Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran

⁴ Professor, Department of Chemical Engineering School of Material Engineering and Advanced Processes Amirkabir University of Technology, Tehran, Iran

https://doi.org/10.22050/ijogst.2022.327070.1626

Abstract

Asphaltene-induced formation damage is one of the complicated processes of permeability damage in porous media, particularly in the near-wellbore area. Asphaltene particles precipitate out of the bulk fluid phase during production as a consequence of pressure drop, which may reduce permeability owing to both deposition of asphaltene nanoparticles on porous media surfaces and plugging of pore throats by larger asphaltene agglomerates. Asphaltene precipitation and deposition in production tubes and surface facilities are well-documented concerns, and many solutions for managing them are available. However, the effects of asphaltene in the reservoir, particularly in the near-wellbore zone, are little known. In this study, using an artificial porous medium, experimental data on pressure drop due to changes in parameters such as flow rate, type of precipitant n-alkane solvent (N-heptane alkane solvent and n-decane are used), and percentage of precipitant were obtained. Next, the amount of permeability reduction due to asphaltene deposition in a porous medium has been calculated. To identify the dominant mechanism in reducing clogging, experimental data was fitted with the proposed quasi-experimental models at different time intervals. One of the study's accomplishments was determining the major mechanism of permeability reduction (in vitro) using a reasonably basic model with the least dependent parameters and a decent approximation. According to the findings, pore throat plugging becomes the dominant mechanism of permeability reduction, although filtration cake formation and surface deposition may exist during the tests.

Highlights

Mechanism of asphaltene deposition and fouling in porous media have been studied
Asphaltene deposits and permeability loss in porous media have been investigated
Impact of the different parameters on asphaltene accumulation have been discussed

Keywords

Main Subjects

Chemical Engineering – Transport phenomena

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Iranian Journal of Oil and Gas Science and Technology

Asphaltene deposition in porous media micromodels: experimental studies and comprehensive permeability-reducing mechanisms

References

References

Volume 11, Issue 2 - Serial Number 39
April 2022
Pages 81-96

Asphaltene deposition in porous media micromodels: experimental studies and comprehensive permeability-reducing mechanisms

References

References

Volume 11, Issue 2 - Serial Number 39April 2022Pages 81-96

Volume 11, Issue 2 - Serial Number 39
April 2022
Pages 81-96