Effects of Correlation Length and Lamination Direction on CO2 Residual Trapping Ability for Different Sandstone Types

9 Pages Posted: 4 Apr 2019 Last revised: 24 Apr 2019

See all articles by Hailun Ni

Hailun Ni

Stanford University

Maartje Boon

Stanford University

Charlotte Garing

Stanford University - Department of Energy Resources Engineering

Sally Benson

Stanford University - Global Climate and Energy Project

Abstract

To better understand what factors affect CO2 residual trapping is essential for CO2 geologic storage purposes. In this study, nine CO2/water coreflooding experiments have been conducted at reservoir conditions on five different types of sandstone core samples to investigate whether correlation length and lamination direction have a significant influence on CO2 residual trapping ability. Using a medical CT scanner, accurate voxel-level porosity and CO2 saturation map can be extracted. By fitting a theoretical variogram model to the directional experimental variogram, one can then obtain an estimate of the correlation length for the core porosity field. Then by correlating the correlation length parameter to the linear trapping coefficient for the nine experiments, we can evaluate whether correlation length affects residual trapping. By comparing the CO2 residual trapping measurements obtained from one set of Berea core samples with lamination direction parallel to the flow and another set of Berea core samples with lamination direction perpendicular to the flow, we can evaluate lamination direction’s influence on residual trapping. Experimental results from this study show that while correlation length and lamination direction significantly affect post-drainage CO2 saturation distribution, their influence is much weaker on post-imbibition CO2 saturation distributions. Consequently, for laminations of the spatial scale examined here, CO2 residual trapping ability is unaffected by correlation length and lamination direction.

Keywords: Trapping mechanisms, CO2 residual trapping, capillary trapping, CO2 sequestration, multiphase flow, GHGT-14

Suggested Citation

Ni, Hailun and Boon, Maartje and Garing, Charlotte and Benson, Sally, Effects of Correlation Length and Lamination Direction on CO2 Residual Trapping Ability for Different Sandstone Types. 14th Greenhouse Gas Control Technologies Conference Melbourne 21-26 October 2018 (GHGT-14) , Available at SSRN: https://ssrn.com/abstract=3366071

Hailun Ni (Contact Author)

Stanford University ( email )

Maartje Boon

Stanford University ( email )

Stanford, CA 94305
United States

Charlotte Garing

Stanford University - Department of Energy Resources Engineering

United States

Sally Benson

Stanford University - Global Climate and Energy Project

Jerry Yang & Akiko Yamazaki Environment & Energy B
473 Via Ortega
Stanford, CA 94305
United States

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