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Developing a Thermally Stable Ester-Based Drilling Fluid for Offshore Drilling Operations by Using Aluminum Oxide Nanorods

Author

Listed:
  • Alaa Ahmed

    (School of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UK)

  • Amin Sharifi Haddad

    (School of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UK)

  • Roozbeh Rafati

    (School of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UK)

  • Ahmed Bashir

    (School of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UK)

  • Ahmed M. AlSabagh

    (Petroleum Application Department, Egyptian Petroleum Research Institute, Cairo, Egypt)

  • Amany A. Aboulrous

    (Production Department, Egyptian Petroleum Research Institute, Cairo, Egypt)

Abstract

Esters were found to be promising alternatives to oil, as a constituent of drilling fluids, due to their biodegradability and bioaccumulation attributes. In this study, we used ethyl octanoate ester (EO) as a low molecular weight synthetic oil for formulating an ester-based drilling fluid (EBDF). Aluminum oxide nanorods (nanoparticles) were introduced as a Pickering emulsion stabilizer. Like the commercial emulsifiers, they showed that they stabilized the invert emulsion drilling fluid in our study. The rheological and filtration properties of the EBDF were tested at normal pressure and three temperatures: low temperature deepwater (LT) conditions of 2.6 °C, normal pressure and normal temperature (NPNT) conditions of 26.8 °C, and elevated temperature conditions of 70 °C. To enhance the stability and filtration properties of the drilling fluid, aluminum oxide nanoparticles (NPs) were used. An optimum concentration of 1 wt% was found to provide superior rheological performance and higher stability than samples without NPs at NPNT, LT, and elevated temperature conditions. Steadier gel rheology was exhibited at elevated temperature conditions, and a slow rate of an increasing trend occurred at the lower temperatures, with increasing NP concentrations up to 1.5 wt%. Filtration loss tests presented a reduction of fluid loss with increasing the NP concentration. The results demonstrate that a reduction of up to 45% was achieved with the addition of 1 wt% NP. These results show that nano-enhancement of ethyl octanoate drilling fluids would suffice to provide a wider range of operational temperatures for deepwater drilling operations by providing better thermal stability at elevated temperatures and maintaining stability at lower temperatures.

Suggested Citation

  • Alaa Ahmed & Amin Sharifi Haddad & Roozbeh Rafati & Ahmed Bashir & Ahmed M. AlSabagh & Amany A. Aboulrous, 2021. "Developing a Thermally Stable Ester-Based Drilling Fluid for Offshore Drilling Operations by Using Aluminum Oxide Nanorods," Sustainability, MDPI, vol. 13(6), pages 1-18, March.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:6:p:3399-:d:520203
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    References listed on IDEAS

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    1. Razali, S.Z. & Yunus, R. & Abdul Rashid, Suraya & Lim, H.N. & Mohamed Jan, B., 2018. "Review of biodegradable synthetic-based drilling fluid: Progression, performance and future prospect," Renewable and Sustainable Energy Reviews, Elsevier, vol. 90(C), pages 171-186.
    2. Zisis Vryzas & Vassilios C. Kelessidis, 2017. "Nano-Based Drilling Fluids: A Review," Energies, MDPI, vol. 10(4), pages 1-34, April.
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