Experimental investigation of tertiary CO 2 injection for enhanced heavy oil recovery

N2-foam-assisted CO2 huff-n-puff process for enhanced oil recovery in a heterogeneous edge-water reservoir: experiments and pilot tests

“…When the pressure is less than the MMP, the oil recovered by CO 2 is mainly through oil swelling, viscosity reduction, light components of oil extraction, and relative permeability of water and gas reduction. [13][14][15][16][17] When the pressure approaches or exceeds the MMP, the interfacial tension (IFT) between CO 2 and oil can be sharply reduced to form a nearmiscible or miscible CO 2 huff-n-puff process, which will drastically enhance the oil recovery. 18,19 The CO 2 huff-n-puff process has been applied in North Gaoqian Block, China since 2010, and more than 16 Â 10 4 tons of crude oil was recovered by CO 2 until the end of 2017.…”

Isolating, identifying and evaluating of oil degradation strains for the air-assisted microbial enhanced oil recovery process

“…Microbial enhanced oil recovery (MEOR) is an effective method for improving oil recovery at the late stage of oilfield development [4]. It offers many advantages, such as low cost, powerful adaptability, simple construction, harmless reservoir and no-pollution [5][6][7]. [8] reported that in comparison to chemical and physical treatments, microbial treatments may offer a non-hazardous and economically viable strategy for the prevention of paraffin deposition.…”

Experimental investigation on influencing factors of CO2huff and puff under fractured low‐permeability conditions

“…4,5 Accordingly, artificial fractures need to be formed through hydraulic fracturing to enhance the fluid flowability in low-permeability oil reservoirs. [9][10][11][12] Today, methods of CO 2 injection enhanced oil recovery (EOR) are used widely in oil field practice, including CO 2 flooding (CO 2 miscible flooding, CO 2 near-miscible flooding, and CO 2 immiscible flooding), CO 2 huff and puff, and CO 2 -water alternate injection. As a consequence, more oil can be produced and oil recovery can be enhanced by reducing oil viscosity, expanding oil volume, and extracting the light components of crude oil.…”

“…As a consequence, more oil can be produced and oil recovery can be enhanced by reducing oil viscosity, expanding oil volume, and extracting the light components of crude oil. [9][10][11][12] Today, methods of CO 2 injection enhanced oil recovery (EOR) are used widely in oil field practice, including CO 2 flooding (CO 2 miscible flooding, CO 2 near-miscible flooding, and CO 2 immiscible flooding), CO 2 huff and puff, and CO 2 -water alternate injection. Among above methods, CO 2 huff and puff has attracted more attention as an efficient and important technique.…”