Immiscible carbon dioxide (CO2) injection is an enhanced oil recovery (EOR) used to increase oil recovery from heavy oil reservoirs. This method has many advantages including the ability of the CO2 to interact with the crude oil and reduce its viscosity to mobilize the crude oil by increasing its mobility. Understanding the conditions at which immiscible CO2 injection can be injected into oil reservoirs and how it can interact with the crude oil to mobilize it is extremely important in optimizing this EOR process and also to help increase the overall effectiveness in both oil recovery and CO2 storage. This research performs a data analysis on the laboratory studies conducted using immiscible CO2 injection using more than 1000 experimental data points. The research then develops a screening criterion based on the data analysis developed in order to be able to function as a guideline to the application of immiscible CO2 injection in laboratory studies. The histograms developed include crude oil properties, reservoir thermodynamic conditions, injected fluid conditions, and CO2-Oil interactions. The data analysis was performed on all core and porous media type.

1. INTRODUCTION

CO2 injection is a highly applicable EOR method that is used to increase oil recovery from oil reservoirs (Fakher, 2020; Fakher et al. 2019; Sugai et al. 2014; Motahhari et al. 2013; Fakher et al. 2020). CO2 can be injected in many ways at different phases and states based on the reservoir rock and fluid properties, thermodynamics, and the treatment methods. Understanding the conditions at which CO2 injection can result in the highest oil recovery and how to optimize this method can result in increasing the oil recovery potential for immiscible CO2 injection and can also increase the CO2 storage potential significantly (Mullken and Sandler, 1980; Fakher et al. 2019).

During its interaction with the crude oil, several mechanisms will help increase the crude oil recovery. These include oil swelling due to partial CO2 dissolution in the crude oil, oil viscosity reduction, which is a highly advantageous interaction especially in heavy oils, mobility improvement, and oil relative permeability increase (Honarpour et al. 2010; Martin and Taber, 1992; Mehana et al. 2018).

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