Enhanced oil recovery application in low permeability formations by the injections of CO2, N2 and CO2/N2 mixture gases
نویسندگان
چکیده
Abstract Low oil recovery which is very predominant in shale reservoirs has stimulated petroleum engineers to investigate the applications of enhanced methods these formations. One such application injection gases into formation stimulate increased recovery. In many gas flooding projects performed field, miscibility injected usually most desired displacement mechanism, and carbon dioxide (CO 2 ) been recognized be best performing for due its ability miscible with reservoir at low pressures compared other as nitrogen. This minimum pressure (MMP) crucial importance because it primary limiting factor feasibility a project. However, there are factors cost availability and, instances, nitrogen (N lean more preferred candidate opposed gas. Mixing or required ratio can allow us design an that will suitable enough satisfy both constraints same time achieve reachable reasonable pressure. The objective this paper effect mixing 50:50 on tight experiment was controlled core sample, crude cleaning saturation process repeated each trial. used live from Eagle ford formation, were (99.9% purity), mixture ratio. ranged 1000 5000 psi increments psi, 6 h. potential N , CO –CO improving assessed along breakthrough time. results showed had highest followed by lowest longest time, shortest significantly longer than pure RF increasing pressure, but decreased incremental all three cases when above 3000 psi.
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ژورنال
عنوان ژورنال: Journal of Petroleum Exploration and Production Technology
سال: 2021
ISSN: ['2190-0566', '2190-0558']
DOI: https://doi.org/10.1007/s13202-021-01113-5