Pore-scale flow simulation of supercritical CO2 and oil flow for simultaneous CO2 geo-sequestration and enhanced oil recovery

Influence Factors and Feasibility Evaluation on Geological Sequestration of CO2 in Coal Seams: A Review

“…Roof-floor strata, a stable coal seam, is an effective guarantee for realizing the geological storage of CO 2 . In order to prevent vertical dispersion of CO 2 and reduce the percolation and diffusion of CO 2 , the overlapped effective strata ensure that more of the CO 2 is found in the coal seams within a certain geological time scale while maintaining the balance of strata pressure and phase state. , The developmental level, mechanical properties, and distribution range of caprock directly affect the advantages and disadvantages of CO 2 storage and site selection in coal seams. , Rock formations with low permeability, undeveloped fractures, certain thickness, continuity, and toughness, such as paste salts, mudstones, and shales, are suitable as caprock for CO 2 geological sequestration. , The increase of reservoir pressure after the injection of CO 2 into the coal seam can easily induce microcracking or fissions in the coal seam roof-floor strata, thus disrupting the closeness of caprock. , Simultaneously, it is easy for the CO 2 to form gas channeling when a large amount of CO 2 is injected into the coal seam. It will cause the thin caprock to be breached by the CO 2 injection pressure and cause leakage .…”

“…Porosity is a critical factor influencing the CO 2 sequestration capacity of coal seams. , Higher porosity corresponds to a greater CO 2 sequestration capacity within the coal seams . When coal seams contain a substantial amount of water, CO 2 and H 2 O within the coal seam combine to form H 2 CO 3 , which leads to the dissolution of minerals and an increase in the number and volume of pores .…”

Three-Phase Fluid Flow Interaction at Pore Scale during Water- and Surfactant-Alternating Gas (WAG/SAG) Injection Using Carbon Dioxide for Geo-Sequestration and Enhanced Oil Recovery

“…(a) Validation of CFD simulations for 4 and 6 mm bubbles; (b) time evolution of 4 mm bubble in the tank; (c) position of the meniscus with time validation from analytical solution; (d) position of the meniscus at three consecutive time steps; (e) movement of gas in liquid phase, where U G = 0.035 m/s, U L 0.09 m/s surface tension = 0.031 N/m water wall contact angle = 0° ( U G and U L are superficial velocities for gas and liquid, respectively); and (f) evolution of liquid–liquid displacement where V c = V d = 1.197 mm/s; μ c = 44.1 mPa·s, μ d = 1.05 mPa·s, Re = 0.00266, Ca = 0.0023 (μ c and μ d are viscosities of continuous and dispersed phases, respectively, R e is Reynolds number, and Ca is a capillary number) . Reproduced with permission from Chowdhury et al Copyright [2022] Publisher Springer Nature.…”

“…It was observed that ε for light oil was highly affected at lower velocities (0.0005 m/s). However, for heavy oil, the relationship was reversed that showed sensitivity at lower velocities (0.0005 m/s) compared to higher ones (0.005 m/s) . Furthermore, Chaudhary et al.…”

“…However, for heavy oil, the relationship was reversed that showed sensitivity at lower velocities (0.0005 m/s) compared to higher ones (0.005 m/s). 51 Furthermore, Chaudhary et al analyzed the trapping mechanism of supercritical CO 2 in the sc-CO 2 brine system along with the effect of grain wettability and shape. 52 Several more experimental and numerical studies have been performed by different researchers to understand CO 2 displacement in water and carbonated water system using micromodels.…”