Performance of CO2 Huff-and-Puff Process in Fractured Media (Experimental Results)
Notice bibliographique
Résumé
Abstract In this study, the performance and efficiency of CO2 huffand-puff process for improving oil recovery and subsequent storage of CO2 in fractured porous media is examined and the results of experimental tests are presented. The experimental set up consisted of a high-pressure stainless steel cell made specially to hold a cylindrical core with spacing around it to simulate fractures surrounding matrix. The matrix was saturated with normal decane, which was used as oil during these experiments. Total six sets of huff-and-puff experiments, using CO2 as solvent, were conducted for pressures of 250, 500, 750, 1000, 1250, and 1500 psi. Each set of the huff-and-puff experiments were conducted by injecting CO2 in fracture system surrounding the core (injection step). Then, the system was shut-in for a period of 24 hours to allow CO2 to diffuse from fracture into the oil in matrix (soaking period step). At the end of soaking period, the pressure was released and the oil production was measured (production step). The above cycle was repeated until no more oil was produced. The results obtained show that CO2 huff-and-puff process improves the oil production from fractured reservoirs, significantly. These results also indicate that the oil recovery is higher for huff-andpuff experiments conducted at higher pressures. Introduction Implementing huff-and-puff processes, through utilizing various miscible and immiscible solvents, for improving oil recovery from oil reservoirs has been tested by various researchers through laboratory investigations, as well as field tests. Most of the works reported, either in the laboratory or field trials, are limited to the conventional single porosity reservoirs. Cyclic CO2 injection was originally proposed as an alternative to cyclic steam stimulation for heavy oil reservoirs. However, it has found wide applications in light-oil reservoirs (1). An immiscible CO2 huff-and-puff pilot project was carried out by Turkish Petroleum Corporation in Camurla Field that has a heavy crude oil of 11–12 °API (2). The laboratory tests, reservoir studies, and design of injection and production facilities were done by IFP (Institute Fran?ois du Petrole). The results of this early application of huff-and-puff immiscible CO2 project were not economical in all stages due to the lack of equipments and some field problems. However, significant reduction in the oil viscosity and interfacial tension resulted in improving oil recovery in some stages of this project. Also, there was an evidence of dissolution of calcium carbonate by carbonic acid which resulted in improving permeability. Another study by Monger and Coma showed that waterflood residual oil can be displaced by CO2 huff-and-puff process in a light crude oil Berea core (3). They also pointed out that, there is less sensitivity to the soak period, and operating at the minimum miscibility pressure (MMP) is not critical to the ultimate recovery. Later on, an evaluation of CO2 huff-and-puff tests on 28 wells in Texas by Haskin and Alston confirmed that soak time period has not significant impact on the oil recovery under immiscible condition (4).
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| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
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| 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 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 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.
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