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Simulation of Thermo-Hydro-Mechanical Effects of Gas Injection in Carbonate Reservoirs on the Caprock Integrity

SEMINARIO GRUPO DE HIDROLOGÍA SUBTERRANEA (UPC-CSIC)

Día: 30 de noviembre
Hora: 12:15h
Lugar: Aula del CIHS, Modulo D2, UPC

Autor: AHMAD ZAREI
Amirkabir University of Technology - Tehran Polytechnic.

Abstract: To attain the maximum production in hydrocarbon reservoirs, the use of enhanced oil recovery (EOR) methods is required. One EOR method consists in injecting gas, e.g., methane or CO2, in order to compensate the reservoir pressure decline and subsequently improving hydrocarbon production. This method causes stress changes in the injection region and may affect the geomechanical stability of the caprock. Caprocks of the studied carbonate reservoirs present complex structures and are highly layered, with alternating marl, salt, anhydride, shale and sandstone layers. Furthermore, information on geomechanical properties of these formations is scarce. These limitations and complexities highlight the challenges of performing comprehensive geomechanical studies to assess the short- and long-term integrity of the caprock during gas injection treatments. The overall objective of this research is to gain understanding of the geomechanical response of a fractured reservoir and its caprock to gas injection and to identify the regions of the caprock which are prone to undergo tensile or shear failure during the several cycles of production-injection along the reservoir lifecycle. To this end, thermo-hydro-mechanical coupled numerical modeling of gas injection in naturally fractured carbonate reservoirs, simulating the pressure buildup and temperature change in the fractures during the gas injection procedure will be performed

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