Marshall Hartung, Youssef Elkady, Anthony Kovscek
Methods of Enhanced Gas Recovery (EGR) have facilitated the increased production of natural gas from unconventional reservoirs in recent years. Two developing forms of EGR, continuous gas injection and huff-n-puff, show potential due to their monetary benefits through either carbon sequestration with the implementation of a carbon tax or increased CH4 production. This research project explores the effects of varying multiple operational decisions and reservoir characteristics on the success of these two EGR methods. This research used CMG GEM software to design multiple field scenarios and create CH4 production and CO2 injection and production curves for these cases. To determine baseline measurement for permeability, porosity, and gas adsorption of unconventional shale, pulse decay experiments were conducted on core samples initially. These properties served as the reservoir variables in the field scale models for both continuous gas injection and huff-n-puff. As for operational decisions, the duration of the production/injection schedule were varied. The simulations showed increased CH4 production providing the main benefit for huff-n-puff EGR. This, however, appears to be the opposite for continuous injection, which finds economic benefits largely from CO2 storage. Reservoir permeability for continuous gas injection and operational decisions for huff-n-puff produced the greatest movement towards profitable revenue streams. The benefits drawn from opposing aspects suggest viability for only one of the EGR methods depending on future market values and the possibility of a carbon tax.
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