Evaluation of Geo-Mechanical-Chemical Impacts of Co2 Injection to Depleted Oil Reservoirs

Posted: 12 Apr 2021

See all articles by Benjamin Adu-Gyamfi

Benjamin Adu-Gyamfi

New Mexico Institute of Mining and Technology

William Ampomah

New Mexico Institute of Mining and Technology

Qian Sun

New Mexico Institute of Mining and Technology

Robert Will

New Mexico Institute of Mining and Technology

Jiawei Tu

New Mexico Institute of Mining and Technology

Date Written: February 15, 2021

Abstract

This paper presents a more holistic approach in evaluating the impacts of CO2 injection in CO2 sequestration operations in a depleted Morrow B sandstone of the Farnsworth Unit, Ochiltree County, Texas. The complex interactions between CO2 and the formation fluids (oil and brine) and the acidized brine interactions with formation rock when coupled with mechanical processes present an integrated and realistic effect of CO2 injection in the underground environment. In light of this, different coupled numerical simulation models were developed to investigate the various CO2 trapping mechanisms and the long-term fate of CO2 in a depleted Morrow B sandstone. The models include hydrodynamical model, coupled hydrodynamical-mechanical model, coupled hydrodynamical-chemical model, and coupled hydrodynamical-chemical-mechanical model. A WAG operation was carried out for 20 years after the history period and followed by a post-injection period of 1000 years to monitor and evaluate the effect of the injected CO2 on the underground environment. This work shows that geomechanics impacted the petrophysical properties of the reservoir and had significant impact on the injectivity of CO2. The chemical reactions had very little impact on the petrophysical properties of the reservoir. The different simulation scenarios resulted in variable amounts of storage within the partially depleted oil reservoir.

Keywords: Hydrodynamical model, Geomechanical model, Geochemical model, Residual trapping, Solubility trapping, Mineral trapping, Trapping mechanisms

Suggested Citation

Adu-Gyamfi, Benjamin and Ampomah, William and Sun, Qian and Will, Robert and Tu, Jiawei, Evaluation of Geo-Mechanical-Chemical Impacts of Co2 Injection to Depleted Oil Reservoirs (February 15, 2021). Proceedings of the 15th Greenhouse Gas Control Technologies Conference 15-18 March 2021, Available at SSRN: https://ssrn.com/abstract=3819285 or http://dx.doi.org/10.2139/ssrn.3819285

Benjamin Adu-Gyamfi (Contact Author)

New Mexico Institute of Mining and Technology ( email )

801 Leroy Place
Socorro, NM 87801
United States

William Ampomah

New Mexico Institute of Mining and Technology ( email )

801 Leroy Place
Socorro, NM 87801
United States

Qian Sun

New Mexico Institute of Mining and Technology ( email )

801 Leroy Place
Socorro, NM 87801
United States

Robert Will

New Mexico Institute of Mining and Technology ( email )

801 Leroy Place
Socorro, NM 87801
United States

Jiawei Tu

New Mexico Institute of Mining and Technology ( email )

801 Leroy Place
Socorro, NM 87801
United States

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