An Experimental Study on the Effects of Competitive Adsorption During Huff-N-Puff Enhanced Gas Recovery
Notice bibliographique
Résumé
Abstract Gas is stored in tight reservoirs both as a free gas occupying the pores, and as an adsorbed gas on the rock matrix. Adsorbed gas exhibits liquid-like densities resulting in significantly more gas being stored on the rock surface. This research aims to highlight the effects of competitive adsorption during Huff-n-Puff enhanced gas recovery (EGR) on activated carbon to achieve maximum gas recovery. Pure methane was initially adsorbed by the activated carbon sample in four simple pure component adsorption stages. The methane was then produced in a primary production stage, allowing some methane to desorb from the activated carbon. The free and adsorbed methane was then displaced in five subsequent cyclical injection/production stages with a displacing gas, either nitrogen or carbon dioxide. The experiments were conducted at 30 °C, 45 °C, and 80 °C, and the temperature was maintained using a water bath. The purpose of testing a variety of temperatures was to highlight the effect of temperature on competitive adsorption and recovery factors. From the experiments, adsorption capacity was plotted as a function of the isothermal pressure and methane composition. This data was then fitted with the Extended Langmuir model because of its popularity and simplistic approach for multicomponent gas mixtures. It was observed that total adsorption capacity decreased as a function of temperature for both the nitrogen and carbon dioxide displacement experiments. Selectivity ratios were also determined for each experiment. At all temperatures, carbon dioxide had a higher selectivity ratio over methane compared to the selectivity ratio between nitrogen and methane. Selectivity ratios did not correlate with changing temperatures in both sets of experiments. Recovery factors were also determined for each experiment. Incremental recovery factors progressively decreased with each subsequent production stage. Cumulatively, the carbon dioxide experiments exhibited higher recovery at each temperature tested. For these experiments, irreversibilities were not considered due to the authors’ previous experience with single-component adsorption and desorption experiments on activated carbon [1]. To date, there have not been any EGR Huff-n-Puff experiments conducted on highly porous activated carbon samples with a primary focus on the effect of competitive adsorption. This research aims to highlight the effects of temperature and displacement gas type on the competitive adsorption between methane and nitrogen/carbon dioxide and its impact on the recovery factors. By doing so, EGR schemes can be better understood and modeled with improved inputs for competitive adsorption in each injection and production cycle. This will allow for more accurate production forecasting and help minimize the financial risk of costly EGR projects.
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Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,001 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,002 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».