Influence of sulfuric and hydrochloric acid on the resistance of geopolymer cement with nano-silica additive for oil well cement application
International Journal of Structural Integrity
ISSN: 1757-9864
Article publication date: 1 October 2018
Abstract
Purpose
The purpose of this paper is to investigate the resistivity of geopolymer cement with nano-silica additive toward acid exposure for oil well cement application.
Design/methodology/approach
An experimental study was conducted to assess the acid resistance of fly ash-based geopolymer cement with nano-silica additive at a concentration of 0 and 1 wt.% to understand its effect on the strength and microstructural development. Geopolymer cement of Class C fly ash and API Class G cement were used. The alkaline activator was prepared by mixing the proportion of sodium hydroxide (NaOH) solutions of 8 M and sodium silicate (Na2SiO3) using ratio of 1:2.5 by weight. After casting, the specimens were subjected to elevated curing condition at 3,500 psi and 130°C for 24 h. Durability of cement samples was assessed by immersing them in 15 wt.% of hydrochloric acid and 15 wt.% sulfuric acid for a period of 14 days. Evaluation of its resistance in terms of compressive strength and microstructural behavior were carried out by using ELE ADR 3000 and SEM, respectively.
Findings
The paper shows that geopolymer cement with 1 wt.% addition of nano-silica were highly resistant to sulfuric and hydrochloric acid. The strength increase was contributed by the densification of the microstructure with the addition of nano-silica.
Originality/value
This paper investigates the mechanical property and microstructure behavior of emerging geopolymer cement due to hydrochloric and sulfuric acids exposure. The results provide potential application of fly ash-based geopolymer cement as oil well cementing.
Keywords
Acknowledgements
The authors express their gratitude to Universiti Teknologi PETRONAS for providing laboratory facilities and research fund under the Fundamental Research Grant Scheme (FRGS) Project No. 0153AB-K96.
Citation
Ridha, S., Abd Hamid, A.I., Setiawan, R.A. and Shahari, A.R. (2018), "Influence of sulfuric and hydrochloric acid on the resistance of geopolymer cement with nano-silica additive for oil well cement application", International Journal of Structural Integrity, Vol. 9 No. 5, pp. 616-624. https://doi.org/10.1108/IJSI-11-2017-0066
Publisher
:Emerald Publishing Limited
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