Designing smart drilling fluids using modified nano silica to improve drilling operations in geothermal wells

Martin, C, Babaie, M ORCID: https://orcid.org/0000-0002-8480-940X, Nourian, A ORCID: https://orcid.org/0000-0001-8998-2300 and Nasr, GG ORCID: https://orcid.org/0000-0001-7913-5802 2022, 'Designing smart drilling fluids using modified nano silica to improve drilling operations in geothermal wells' , Geothermics, 107 (2) .

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Abstract

High pressure and high temperature (HPHT) conditions in geothermal wells have necessitated the need to develop thermally stable geothermal drilling mud systems to combat potential drilling complications. This is because mud fluids degrade under HPHT conditions due to high temperature effects. This study therefore aims to establish the optimum concentration of a cationic surfactant that would successfully modify the surface of silica nanoparticles and thereafter, evaluate the performance of modified nano silica as a rheological and filtration property enhancer in water-based muds (WBMs). The surface of silica nanoparticle was successfully modified by adding Hexadecyltrimethylammonium bromide (CTAB) to silica solution. Different mud formulations containing modified nano silica with varying zeta potential values, SNP3 -S2, SNP3 -S4, SNP3 -S5, SNP3 -S6, and SNP3 -S7 with -17.7 mV, 20 mV, 28.2 mV, 35.4 mV, and 37.1 mV respectively were investigated. Results showed that modified nano silica with the highest absolute value of zeta potential enhanced drilling mud rheology as temperature increased from 149°C to 232 °C. The optimal amount of CTAB was found to be between 1.0 and 2.0 wt.%. Filtration loss was reduced by 11.4, 17.6, and 29.5% on average for mud samples SNP3-S5, SNP3-S6, and SNP3-S7, respectively, at all temperatures. Mud cake thickness was reduced by 19.9, 11.6, and 28.7% on average by mud samples SNP3-S5, SNP3-S6, and SNP3-S7 respectively at all temperatures.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Geothermics
Publisher: Elsevier
ISSN: 0375-6505
Depositing User: Amir Nourian
Date Deposited: 28 Oct 2022 10:32
Last Modified: 28 Oct 2022 10:45
URI: https://usir.salford.ac.uk/id/eprint/65369

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