- Cet évènement est passé.
Café thésard : Enhanced Coalbed Methane recovery by CO2 injection
1 avril 2021 @ 14h00 - 15h00
Le prochain café thésard sera présenté par Quoc Dat Ha, doctorant en Transport en Milieux Complexes. Il aura lieu jeudi 1er avril à 14h par visio avec Microsoft Teams en cliquant sur ce lien.
Résumé :
Enhanced Coalbed Methane Recovery (ECBM) is the combination of the exploitation of an unconventional gas resource and an environmentally sustainable process that combines methane (CH4) production and CO2 sequestration (see Figure 1a). The exploitation of coal gas consists of recovering the coal gas contained in the coal seams. Desorption of the methane takes place simply by lowering the pressure of the gas in the vicinity of the extraction well. The depth of coal seams in Lorraine varies from 100 to 2500 meters.
Coalbed methane is a form of natural gas that consists primarily of methane (CH4) extracted from coal deposits. The term refers to methane adsorbed in the solid matrix of coal. The presence of this gas is well known in reference to the firedamp accidents that can occur during underground coal mining operations where it presents a serious safety hazard. Coalbed methane is stored in coal by adsorption: it is in a quasi-liquid state, at the surface of nanometer-sized pores in the coal (called matrix). There is a second level of porosity consisting of open fractures of submillimeter size (called cleats) which are initially saturated with water (see Figure 1b).
My thesis project aims to build a rigorous multi-scale model of CO2 injection-enhanced coalbed gas recovery able to combine multiple scale and physical phenomena:
- coupling poromechanics induced by gas adsorption in single and double porosity media considering the solvation force due to gas absorption for a mixture CH4 and CO2,
- describing the water and gases transport in the system: the transport in submillimeter size cleats,
- implementing a numerical code to perform realistic large-scale simulations.