Fracture Mechanism on Supercritical Carbon Dioxide Blasting in Low-Permeability Coal Under Various Crustal Stresses

2020 ◽  
Vol 12 (4) ◽  
pp. 570-574
Author(s):  
Liwei Xin
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Fracture Mechanism ◽  
Coalbed Methane ◽  
Theoretical Foundation ◽  
Low Permeability ◽  
Large Size ◽  
Crustal Stresses ◽  
Cbm Production ◽  
Supercritical Carbon

The low permeability of coalbed inhabits exploring coalbed methane (CBM) in China. In order to enhance CBM production, supercritical carbon dioxide (SC-CO2) blasting is used as an efficient and promising method. In the paper, the experiments of SC-CO2 blasting were performed for coal and concrete specimens in the large size (1 m × 1 m × 0.5 m) under different crustal stresses, and then the fracture mechanism was analyzed. The results show that Crushing zone, rupture zone, and vibration zone were formed in sequence around the blasting hole, which provide the experimental and theoretical foundation for the field blasting.

scholarly journals Estimation of efficiency of oil extraction with supercritical CO2 in a low-permeability reservoir

2021 ◽  
pp. 210-220
Author(s):  
A. I. Shayakhmetov ◽  
◽  
V. L. Malyshev ◽  
E. F. Moiseeva ◽  
A. I. Ponomarev ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Oil Recovery ◽  
Western Siberia ◽  
Oil Extraction ◽  
Core Model ◽  
Low Permeability ◽  
Low Permeability Reservoir ◽  
Object Of Study ◽  
Supercritical Carbon

The results of experimental study of oil extraction by supercritical carbon dioxide in a low-permeability reservoir are presented. As an object of study, we selected core samples from a low-permeability oil-saturated reservoir of one of the fields in Western Siberia, which is currently being developed in the regime of depletion of reservoir energy. The contact time of supercritical carbon dioxide with composite core models in three experiments was 8, 24, and 72 hours, respectively. Based on the results of laboratory experiments, the dynamics of the penetration of carbon dioxide along the depth of the composite core model was established. The value of the oil recovery factor and it’s distribution along the length of the core model in time is given. Keywords: carbon dioxide; low-permeability reservoir; mnimum miscibility pressure; slim-tube; extraction; oil recovery.

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