Document Type

Conference Proceeding

Publication Title

Energy Procedia

Publisher

Elsevier

School

School of Engineering

RAS ID

29531

Comments

Originally published as: Zhang, Y., Lebedev, M., Yu, H., & Iglauer, S. (2018). Experimental study of supercritical CO2 injected into water saturated medium rank coal by X-ray microCT. Energy Procedia, 154, 131-138. Original publication available here

Abstract

Carbon dioxide geosequestration into deep unmineable coal seams is a technique which can mitigate anthropogenic greenhouse gas emissions. However, coal composition is always complex, and some minerals such as calcite chemically react when exposed to the acidic environment (which is created by scCO2 mixing with formation water). These reactive transport processes are still poorly understood. We thus imaged a water-bearing heterogeneous coal (calcite rich) core before and after scCO2 injection in-situ at high resolutions (3.43 µm) in 3D via X-ray in-situ microCT flooding system. Indeed, the calcite-coal mixed layer was partially dissolved, and absolute porosity and connectivity significantly increased. We thus suggested that such process could be used as an acidizing method in CO2 ECBM. However, such dissolved damage also can significantly affect the rock mechanical properties and potentially induce geohazards.

Additional Information

Paper presented at the Applied Energy Symposium and Forum, Carbon Capture, Utilization and Storage, CCUS 2018, 27–29 June 2018, Perth, Australia.

DOI

10.1016/j.egypro.2018.11.022

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

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