Experimental study on the effect of biocompetitive exclusion chemical on the unconfined compressive strength of sandstone reservoir rock under static saturation.

Peretomode, Ebikapaye; Faisal, Nadimul; Oluyemi, Gbenga

Abstract

The potential impacts of oilfield chemical treatment on the petrophysical and geomechanical properties of reservoir rock are well known. In this paper, the effect of bio-competitive exclusion chemical (sodium nitrate) treatment on sandstone rock properties under static saturation has been examined. A combination of analytical and mechanical testing approaches was used. Analytical methods include scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (SEM/EDX), and X-ray powder diffraction (XRPD) while the mechanical testing method used was unconfined compressive strength (UCS) test. The test results suggest the dissolution and precipitation of new minerals, leading to mineralogical alterations and slightly enhanced porosity from 21.1 ± 0.3% to 21.6 ± 0.1%, indicating an increase of about 2.9%. Results from the unconfined compressive strength (UCS) test show a 0.9% reduction for sandstone. The study suggests that biocompetitive exclusion chemical treatment has an insignificant impact on the geomechanical properties of the sandstone reservoir formation.

Citation

PERETOMODE, E., FAISAL, N. and OLUYEMI, G. 2025. Experimental study on the effect of biocompetitive exclusion chemical on the unconfined compressive strength of sandstone reservoir rock under static saturation. Geomechanics and geoengineering [online], Latest Articles. Available from: https://doi.org/10.1080/17486025.2025.2484482

• Journal Article Type: Article
• Acceptance Date: Mar 20, 2025
• Online Publication Date: Apr 5, 2025
• Deposit Date: Apr 11, 2025
• Publicly Available Date: Apr 11, 2025
• Journal: Geomechanics and geoengineering
• Print ISSN: 1748-6025
• Electronic ISSN: 1748-6033
• Publisher: Taylor and Francis
• Peer Reviewed: Peer Reviewed
• DOI: https://doi.org/10.1080/17486025.2025.2484482
• Keywords: Biocompetitve exclusion; Core saturation; Geomechanical strength; Oilfield chemical; porosity analysis; Sandstone rock
• Public URL: https://rgu-repository.worktribe.com/output/2780441