A numerical simulation study of CO2 injection for enhancing hydrocarbon recovery and sequestration in liquid-rich shales

Abstract

Less than 10% of oil is usually recovered from liquid-rich shales and this leaves much room for improvement, while water injection into shale formation is virtually impossible because of the extremely low permeability of the formation matrix. Injecting carbon dioxide (CO 2 ) into oil shale formations can potentially improve oil recovery. Furthermore, the large surface area in organicrich shale could permanently store CO 2 without jeopardizing the formation integrity. This work is a mechanism study of evaluating the effectiveness of CO 2 -enhanced oil shale recovery and shale formation CO 2 sequestration capacity using numerical simulation. Petrophysical and fluid properties similar to the Bakken Formation are used to set up the base model for simulation. Result shows that the CO 2 injection could increase the oil recovery factor from 7.4% to 53%. In addition, petrophysical characteristics such as in situ stress changes and presence of a natural fracture network in the shale formation are proven to have impacts on subsurface CO 2 flow. A response surface modeling approach was applied to investigate the interaction between parameters and generate a proxy model for optimizing oil recovery and CO 2 injectivity.

Advance artificial time series forecasting model for oil production using neuro fuzzy-based slime mould algorithm

“… 2020 ; Kalra et al. 2018 ). Although multi-objective optimization issues can be addressed effectively, a perfect reservoir history matching model can trigger to cause a bad prediction.…”

Performance of free gases during the recovery enhancement of shale gas by CO2 injection: a case study on the depleted Wufeng–Longmaxi shale in northeastern Sichuan Basin, China

“…Current knowledge strongly supports CO 2 sequestration in geological formations (e.g., shale and coalbed) as a promising approach to respond to the issue of excessive anthropogenic CO 2 emissions into the atmosphere, which is treated as carbon-negative technology and thus has been receiving growing attention (Abidoye et al 2015;Zhang et al 2015;Wan and Liu 2018;Liu et al 2020;Rani et al 2020;Řimnáčová et al 2020). Therein, injecting CO 2 into shale reservoirs is becoming increasingly attractive and has been lauded as a win-win solution for meeting geological CO 2 storage and simultaneous enhanced gas recovery (CS-EGR) from shales (Liu et al 2017b(Liu et al , 2019aKalra et al 2018;Pan et al 2018;Yang et al 2019;Zhang et al 2020). However, understanding of shale-based CS-EGR is limited, with only few pilot field studies undertaken, in which strategy optimization, site characterization/monitoring, and hazard assessment & management need to be taken into account in a comprehensive manner (Chi et al 2017;Ajayi et al 2019;Zhang et al 2019;Chen et al 2020;Iddphonce et al 2020).…”

Risk assessment of corroded casing based on analytic hierarchy process and fuzzy comprehensive evaluation

“…Injecting CO 2 into the depleted oil reservoirs for storage or to enhance oil and gas production is considered as one of the effective measures to reduce the content of CO 2 in the atmosphere (Ajayi et al 2019;Kalra et al 2018;Khather et al 2019). However, as an acid gas, CO 2 is highly corrosive in water-containing environment (Zhu and Liu 2018).…”