Huff-n-Puff Experimental Studies of CO2 with Heavy Oil
| Autor: | Alexey Cheremisin, Evgeny Shilov, Sergey Kharlanov, Kirill Maksakov |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Control and Optimization
Petroleum engineering Renewable Energy Sustainability and the Environment 020209 energy Energy Engineering and Power Technology 02 engineering and technology Miscibility Permeability (earth sciences) Physical limitations 020401 chemical engineering Pressure increase 0202 electrical engineering electronic engineering information engineering Mixing zone Environmental science Enhanced oil recovery 0204 chemical engineering Electrical and Electronic Engineering enhanced oil recovery CO2 injection heavy oil Huff-n-Puff miscibility evaluation permeability reduction Porous medium Engineering (miscellaneous) Injection pressure Energy (miscellaneous) |
| Zdroj: | Energies; Volume 12; Issue 22; Pages: 4308 |
| ISSN: | 1996-1073 |
| DOI: | 10.3390/en12224308 |
| Popis: | This work is devoted to CO2 Huff-n-Puff studies on heavy oil. Oil recovery for heavy oil reservoirs is sufficiently small in comparison with conventional reservoirs, and, due to the physical limitation of oil flow through porous media, a strong need for better understanding of tertiary recovery mechanisms of heavy oil exists. Notwithstanding that the idea of Huff-n-Puff gas injection technology for enhanced oil recovery has existed for dozens of years, there is still no any precise methodology for evaluating the applicability and efficiency of this technology in heavy oil reservoirs. Oil recovery factor is a question of vital importance for heavy oil reservoirs. In this work, we repeated Huff-n-Puff tests more than three times at five distinct pressure points to evaluate the applicability and efficiency of CO2 Huff-n-Puff injection to the heavy oil reservoirs. Additionally, the most critical factor that affects oil recovery in gas injection operation is the condition of miscibility. Experimental data allowed to distinguish the mixing zone of the light fractions of studied heavy oil samples. The experimental results showed that the pressure increase in the Huff-n-Puff injection process does not affect the oil recovery when the injection pressure stays between miscibility pressure of light components of oil and minimum miscibility pressure. It was detected that permeability decreases after Huff-n-Puff CO2 tests. |
| Databáze: | OpenAIRE |
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