%0 Journal Article %1 https://doi.org/10.1029/2020WR029361 %A Weinhardt, Felix %A Class, Holger %A Vahid Dastjerdi, Samaneh %A Karadimitriou, Nikolaos %A Lee, Dongwon %A Steeb, Holger %D 2021 %J Water Resources Research %K from:hsteeb mib mib_dudu mib_ls2 mib_ls2_steeb myown %N 3 %P e2020WR029361 %R https://doi.org/10.1029/2020WR029361 %T Experimental Methods and Imaging for Enzymatically Induced Calcite Precipitation in a Microfluidic Cell %U https://onlinelibrary.wiley.com/doi/abs/10.1029/2020WR029361 %V 57 %X Abstract Enzymatically induced calcite precipitation (EICP) in porous media can be used as an engineering option to achieve precipitation in the pore space, for example, aiming at a targeted sealing of existing flow paths. This is accomplished through a porosity and consequent permeability alteration. A major source of uncertainty in modeling EICP is in the quantitative description of permeability alteration due to precipitation. This report presents methods for investigating experimentally the time-resolved effects of growing precipitates on porosity and permeability on the pore scale, in a poly-di-methyl-siloxane microfluidic flow cell. These methods include the design and production of the microfluidic cells, the preparation and usage of the chemical solutions, the injection strategy, and the monitoring of pressure drops for given fluxes for the determination of permeability. EICP imaging methods are explained, including optical microscopy and X-ray microcomputed tomography (XRCT), and the corresponding image processing and analysis. We present and discuss a new experimental procedure using a microfluidic cell, as well as the general perspectives for further experimental and numerical simulation studies on induced calcite precipitation. The results of this study show the enormous benefits and insights achieved by combining both light microscopy and XRCT with hydraulic measurements in microfluidic chips. This allows for a quantitative analysis of the evolution of precipitates with respect to their size and shape, while monitoring their influence on permeability. We consider this to be an improvement of the existing methods in the literature regarding the interpretation of recorded data (pressure, flux, and visualization) during pore morphology alteration.

@article{https://doi.org/10.1029/2020WR029361, abstract = {Abstract Enzymatically induced calcite precipitation (EICP) in porous media can be used as an engineering option to achieve precipitation in the pore space, for example, aiming at a targeted sealing of existing flow paths. This is accomplished through a porosity and consequent permeability alteration. A major source of uncertainty in modeling EICP is in the quantitative description of permeability alteration due to precipitation. This report presents methods for investigating experimentally the time-resolved effects of growing precipitates on porosity and permeability on the pore scale, in a poly-di-methyl-siloxane microfluidic flow cell. These methods include the design and production of the microfluidic cells, the preparation and usage of the chemical solutions, the injection strategy, and the monitoring of pressure drops for given fluxes for the determination of permeability. EICP imaging methods are explained, including optical microscopy and X-ray microcomputed tomography (XRCT), and the corresponding image processing and analysis. We present and discuss a new experimental procedure using a microfluidic cell, as well as the general perspectives for further experimental and numerical simulation studies on induced calcite precipitation. The results of this study show the enormous benefits and insights achieved by combining both light microscopy and XRCT with hydraulic measurements in microfluidic chips. This allows for a quantitative analysis of the evolution of precipitates with respect to their size and shape, while monitoring their influence on permeability. We consider this to be an improvement of the existing methods in the literature regarding the interpretation of recorded data (pressure, flux, and visualization) during pore morphology alteration.}, added-at = {2021-10-22T16:14:53.000+0200}, author = {Weinhardt, Felix and Class, Holger and Vahid Dastjerdi, Samaneh and Karadimitriou, Nikolaos and Lee, Dongwon and Steeb, Holger}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2a6ca58265ee4954bd2ef0a397abe2684/mib_ls2}, doi = {https://doi.org/10.1029/2020WR029361}, eprint = {https://onlinelibrary.wiley.com/doi/pdf/10.1029/2020WR029361}, interhash = {c0e3dd2e4ddfbd1cec5ea0dce2dab4d0}, intrahash = {a6ca58265ee4954bd2ef0a397abe2684}, journal = {Water Resources Research}, keywords = {from:hsteeb mib mib_dudu mib_ls2 mib_ls2_steeb myown}, note = {e2020WR029361 2020WR029361}, number = 3, pages = {e2020WR029361}, timestamp = {2021-10-22T14:15:47.000+0200}, title = {Experimental Methods and Imaging for Enzymatically Induced Calcite Precipitation in a Microfluidic Cell}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1029/2020WR029361}, volume = 57, year = 2021 }