A fully coupled model for caprock sealing efficiency

Peng, Yan, Liu, Jishan, Pan, Zhejun, Connell, Luke and Chen, Zhongwei (2014). A fully coupled model for caprock sealing efficiency. In: J. F. Labuz, 48th US Rock Mechanics/Geomechanics Symposium. 48th US Rock Mechanics/Geomechanics Symposium, Minneapolis, Minn, United States, (). 1-4 June 2014.

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Name Description MIMEType Size Downloads
Author Peng, Yan
Liu, Jishan
Pan, Zhejun
Connell, Luke
Chen, Zhongwei
Title of paper A fully coupled model for caprock sealing efficiency
Conference name 48th US Rock Mechanics/Geomechanics Symposium
Conference location Minneapolis, Minn, United States
Conference dates 1-4 June 2014
Proceedings title 48th US Rock Mechanics/Geomechanics Symposium
Place of Publication Alexandria, VA, United States
Publisher American Rock Mechanics Association
Publication Year 2014
Sub-type Fully published paper
Open Access Status
ISBN 9781634395236
Editor J. F. Labuz
Volume 1
Total pages 7
Collection year 2015
Abstract/Summary The sealing integrity of a suitable low permeability caprock is one of the most important issues to the safety of long-term CO2 sequestration in a saline aquifer over long geological time periods. From the microscopic viewpoint, caprocks contain microcracks which make caprocks anisotropic in mechanical and hydraulic properties. Additionally, the growth of microcracks could lead to permeability increasing exponentially, which extremely harms caprock sealing efficiency. To assess caprock sealing efficiency accurately, a fully coupled model should include caprock deformation, two-phase flow, CO2 sorption and damage evolution of caprocks. The purpose of this paper is to present such a model for investigating caprock sealing efficiency. Firstly, a conceptual model is proposed for the CO2/water flow in a caprocks with microcracks. In this model CO2/water flow is described by two-phase flow equation with variable porosity and permeability. This provides a solid basis to the further development of numerical simulations for the caprock sealing efficiency assessment. Finally, this fully coupled mathematical model is applied to a caprock layer to investigate the combined effect of fully coupling processes on the caprock sealing efficiency. Model results demonstrate that the damage effects on the caprock sealing efficiency are significant.
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes ARMA-2014-6977

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Created: Wed, 11 Mar 2015, 10:09:30 EST by Zhongwei Chen on behalf of School of Mechanical and Mining Engineering