Imperial College London
Portrait Picture

Prof. J. P. Martin Trusler

Faculty of Engineering, Department of Chemical Engineering

Professor of Thermophysics
 
 
 
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Contact

 

+44 (0)20 7594 5592m.trusler Website

 
 
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Assistant

 

Miss Jessica Baldock +44 (0)20 7594 5699

 
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Location

 

409ACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Anabaraonye:2019:10.1016/j.chemgeo.2019.01.014,
author = {Anabaraonye, BU and Crawshaw, JP and Trusler, JPM},
doi = {10.1016/j.chemgeo.2019.01.014},
journal = {Chemical Geology},
pages = {92--102},
title = {Brine chemistry effects in calcite dissolution kinetics at reservoir conditions},
url = {http://dx.doi.org/10.1016/j.chemgeo.2019.01.014},
volume = {509},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Understanding the chemical interactions between CO 2 -saturated brine systems and reservoir rocks is essential for predicting the fate of CO 2 following injection into a geological reservoir. In this work, the dissolution rates of calcite (CaCO 3 ) in CO 2 -saturated brines were measured at temperatures between 325 K and 373 K and at pressures up to 10 MPa. The experiments were performed in batch reactors implementing the rotating disk technique in order to eliminate the influence of fluid-surface mass transport resistance and obtain surface reaction rates. Three aqueous brine systems were investigated in this study: NaCl at a molality m = 2.5 mol·kg −1 , NaHCO 3 with m ranging from (0.005 to 1) mol·kg −1 and a multicomponent Na-Mg-K-Cl-SO 4 -HCO 3 brine system with an ionic strength of 1.8 mol·kg −1 . Measured dissolution rates were compared with predictions from previously published models. Activity calculations were performed according to the Pitzer model as implemented in the PHREEQC geochemical simulator. Calcite dissolution rates in NaCl and the multicomponent brine system showed minor increases when compared to the (CO 2 + H 2 O) system at identical conditions, despite the lower concentration of dissolved CO 2 . These trends are consistent with the expected minor decreases in solution pH. In NaHCO 3 systems, consistent with increase in solution pH, significant decreases in dissolution rates were observed. In addition, these systems significantly deviated from model predictions at higher salt molalities. Vertical scanning interferometry (VSI) was used to examine the mineral surfaces before and after dissolution experiments to provide qualitative information on saturation states and dissolution mechanism.
AU  - Anabaraonye,BU
AU  - Crawshaw,JP
AU  - Trusler,JPM
DO  - 10.1016/j.chemgeo.2019.01.014
EP  - 102
PY  - 2019///
SN  - 0009-2541
SP  - 92
TI  - Brine chemistry effects in calcite dissolution kinetics at reservoir conditions
T2  - Chemical Geology
UR  - http://dx.doi.org/10.1016/j.chemgeo.2019.01.014
UR  - http://hdl.handle.net/10044/1/67803
VL  - 509
ER  -
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