Experimental Investigation of the Impact of Low Salinity Water and Hydrochloric Acid Solutions as Halite Precipitation Reduction Agents for Enhancing CO2 Injectivity in Deep Saline Aquifers

Darkwah-Owusu, V. and Yusof, M.A.M. and Sokama-Neuyam, Y.A. and Tackie-Otoo, B.N. and Turkson, J.N. and Radzali, I.B. and Yusof, S.R.B.M. and Fjelde, I. (2024) Experimental Investigation of the Impact of Low Salinity Water and Hydrochloric Acid Solutions as Halite Precipitation Reduction Agents for Enhancing CO2 Injectivity in Deep Saline Aquifers. In: UNSPECIFIED.

Full text not available from this repository.
Official URL: https://www.scopus.com/inward/record.uri?eid=2-s2....

Abstract

Reducing CO2 emissions from the atmosphere is one of the most important contributors in the fight against climate change. Salt precipitation, a critical challenge in CO2 storage, adversely affects CO2 injectivity by reducing formation permeability and porosity, consequently diminishing CO2 storage efficiency. This research seeks to experimentally evaluate the effectiveness of Low Salinity Water (LSW) and Hydrochloric Acid (HCl) in mitigating salt precipitation during the injection of CO2 into saline reservoirs to enhance injectivity. In a two-phase experimental approach, this study first simulates salt precipitation scenarios with varying brine salinities (70g/L and 170g/L) to mimic formation damage during continuous CO2 injection. The second phase critically evaluates the impact and effectiveness of LSW and HCl as treatment fluids, as compared to freshwater. The core flooding experiments were conducted at 60 °C and 1600 psi. The initial and final permeability and porosity of the core samples were measured to ascertain the extent of improvement or impairment pre-and post-flooding using brine. The findings reveal a reduction in both porosity (11 - 30) and permeability (28 to 75) due to salt precipitation. LSW treatment proved to be the least effective, likely due to clay swelling. Conversely, HCl treatment exhibited high dissolution potential, achieving a 67 improvement compared to initial permeability for formations with low initial brine concentrations. Interestingly, higher brine salinity during HCl treatment resulted in an increased concentration of free ions, facilitating a rapid reaction between Cl- ions and Cu2+ and Fe3+ ions of the resulting solution. These reactions led to the formation of FeCl3 and CuCl2 salts causing a green coloration in the effluent. This observation suggests the possibility of tertiary reactions that could lead to other in-situ geochemical reactions and mineral precipitation. Copyright © 2024, Offshore Technology Conference.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Additional Information: cited By 1; Conference of 2024 Offshore Technology Conference Asia, OTCA 2024 ; Conference Date: 27 February 2024 Through 1 March 2024; Conference Code:197405
Uncontrolled Keywords: Aquifers; Brines; Copper compounds; Floods; Hydrogeology; Ions; Iron compounds; Offshore oil well production; Porosity; Sodium chloride, CO 2 emission; Deep saline aquifers; Experimental investigations; Hydrochloric acid solution; Hydrochloric acid treatment; Injectivity; Low-salinity water; Permeability and porosities; Reduction agents; Salt precipitation, Carbon dioxide
Depositing User: Mr Ahmad Suhairi UTP
Date Deposited: 04 Jun 2024 14:19
Last Modified: 04 Jun 2024 14:19
URI: https://khub.utp.edu.my/scholars/id/eprint/20147

Actions (login required)

View Item
View Item