Impact of Brine/CO2 exposure on the transport and mechanical properties of the Mt Simon sandstone

Shi, Z.; Sun, L.; Haljasmaa, I.; Harbert, W.; Sanguinito, S.; Tkach, M.; Goodman, A.; Tsotsis, T. T.; Jessen, K.

doi:10.1016/j.petrol.2019.01.112

Impact of Brine/CO₂ exposure on the transport and mechanical properties of the Mt Simon sandstone

Journal Article · Sat Jun 01 04:00:00 EDT 2019 · Journal of Petroleum Science and Engineering

DOI:https://doi.org/10.1016/j.petrol.2019.01.112· OSTI ID:1566474

Shi, Z.; Sun, L.; Haljasmaa, I.; Harbert, W.; Sanguinito, S.; Tkach, M.; Goodman, A.; Tsotsis, T. T.; Jessen, K.

When sandstone rocks are exposed to CO₂-saturated brine, their transport and mechanical properties can change due to brine/CO₂-induced chemical reactions. The present study investigates the change in the flow-through characteristics, porosity, and the mechanical behavior of Mt. Simon Sandstone samples caused by exposure to brine/CO₂. The cores, extracted from a depth interval of 2110.4–2111.4 m (6924–6927 ft) in the Mt. Simon formation, were first characterized for their mechanical and transport properties, and then aged in CO₂-saturated brine at pressures of 17.24 MPa (2500 psi) and temperature of 50 °C for one to two weeks. Following that, the changes in the transport and mechanical properties of the samples were analyzed using He pycnometry, flow perporometry and triaxial testing. Our experiments show that the porosity of the Mt. Simon samples slightly increases after exposure to CO₂/brine, while the permeability increases more substantially depending on the stress state. Measurements of the flow-through pore size distribution (PSD) are indicative of the changes occurring and are consistent with the observed increases in permeability. Nitrogen adsorption tests (BET), before and after incubation, show a significant loss of pore volume in the mesoporous range that is indicative of clay dissolution. Weakening of the materials was observed based on the mechanical properties studied, a result that is consistent with the observed dissolution of clays that play a central role in the cementation of the quartz grains. Finally, the analysis of the brine compositions reveals an increase in concentration of most cations after incubation with the Mt. Simon cores. This is also consistent with mineral/clay dissolution, confirmed by the porosity, transport, and mechanical property measurements as well as electron microscopy analysis of the same samples.

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Geologic Storage of CO2 (GSCO2); Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE SC Office of Basic Energy Sciences (SC-22)

DOE Contract Number:: SC0012504

OSTI ID:: 1566474

Journal Information:: Journal of Petroleum Science and Engineering, Journal Name: Journal of Petroleum Science and Engineering Journal Issue: C Vol. 177; ISSN 0920-4105

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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