Visualizing Convective Mixing: An Experimental Study on the Solubility and pH of CO2 in Brine

Q: What does this research mean for the field?

Supercritical CO2 solubility in brine is promoted by increased pressure but inhibited by higher temperature and salinity, resulting in a highly acidic environment (pH 3.0-3.1) that poses significant corrosion risks to geological caprocks and wellbore equipment. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Meiheriayi Mutailipu; Xiong Yang; Tuersunayi Kuerban; Kaishuai Zuo; Yanjing Li

doi:10.3724/j.issn.1007-2802.20260143

May 1, 2026Bulletin of Mineralogy Petrology and Geochemistry

Visualizing Convective Mixing: An Experimental Study on the Solubility and pH of CO2 in Brine

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Key Points

This research aims to understand how the solubility and pH of CO2 in brine are affected by temperature and salinity.
Conducted experiments using a high-speed camera and high-pressure reactor to visualize CO2-brine mixing.
Captured the dynamic evolution of the gas-liquid interface during CO2 convective mixing and capillary invasion.
Measured solubility and pH of CO2 under varying temperatures (40-60℃) and pressures (7.5-9.5 MPa).
At 8.5 MPa, increasing brine concentration from 0.171 mol/kg to 0.513 mol/kg decreased solubility from 1.045 mol/kg to 0.976 mol/kg.
Increasing pressure from 7.5 MPa to 9.5 MPa at 60℃ improved solubility from 0.864 mol/kg to 0.985 mol/kg.
Dissolved CO2 concentrations ranged between 0.807 and 1.222 mol/kg, with pH values ranging from 3.008 to 3.145.

Implication

Experimental study examines the effects of temperature and salinity on CO2 solubility in brine, implying implications for geological carbon sequestration.

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Cite This Study

Mutailipu et al. (2026) studied this question.

synapsesocial.com/papers/6a28ff956f82f25be989c6c9 https://doi.org/10.3724/j.issn.1007-2802.20260143

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Visualizing Convective Mixing: An Experimental Study on the Solubility and pH of CO2 in Brine

Key Points

Implication

Abstract

Discussion

Cite This Study

Visualizing Convective Mixing: An Experimental Study on the Solubility and pH of CO2 in Brine

Key Points

Implication

Abstract

Discussion

Cite This Study

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