Variation in Critical Porosity from Different Pore Fluid Compositions Evaluated Through Nuclear Magnetic Resonance
Year: 2025
Type: conference-paper
Abstract: In repurposing of wells in depleted oil reservoirs for carbon storage it is importance to ensure lasting sealing of the well annuli, which exist where the mechanical rebound of the cap rock formation was insufficient in closing the gap to the well casing. Due to the reactivity of fine (primarily clay) particles to pore water composition, well sealing through chemically induced swelling could be a viable option. To quantify this potential, the pore space of 39 soil samples from the cap rock was investigated using Nuclear Magnetic Resonance to measure both the pore volume and pore size distribution. The samples varied only in the pore water based on: Na2SO4, LiCl, NaCl, CaCl2, NaI, MgCl2, KCl, NaClO4, HCl, Na2SiO3 and NaOH at different concentrations. Na2SiO3 and NaOH were found to induce the most significant swelling for this soil, which was very reactive despite its relatively low content of constituents that are classically considered to be part of swelling soil.
Author: E. M. Kinslev
Institution: Technical University of Denmark
Language: English
Subfield: Environmental Engineering
Field: Environmental Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4409317054