Experimental Studies of Immiscible High-Nitrogen Natural Gas WAG Injection Efficiency in Mixed-Wet Carbonate Reservoir
| Autor: | Jerzy Kuśnierczyk, Mirosław Wojnicki, Marcin Warnecki, Sławomir Szuflita, J. Lubaś |
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| Rok vydání: | 2020 |
| Předmět: |
Control and Optimization
Gas breakthrough 020209 energy Water injection (oil production) Dolomite Energy Engineering and Power Technology 02 engineering and technology mixed-wet fractured carbonates immiscible gas injection lcsh:Technology chemistry.chemical_compound 020401 chemical engineering Natural gas High nitrogen 0202 electrical engineering electronic engineering information engineering enhanced oil recovery 0204 chemical engineering Electrical and Electronic Engineering Engineering (miscellaneous) FAWAG Petroleum engineering lcsh:T Renewable Energy Sustainability and the Environment business.industry high-nitrogen natural gas WAG chemistry Carbonate Environmental science Enhanced oil recovery Reservoir fluid business Energy (miscellaneous) |
| Zdroj: | Energies, Vol 13, Iss 2346, p 2346 (2020) Energies Volume 13 Issue 9 |
| ISSN: | 1996-1073 |
| DOI: | 10.3390/en13092346 |
| Popis: | Crucial oil reservoirs are located in naturally fractured carbonate formations and are currently reaching a mature phase of production. Hence, a cost-effective enhanced oil recovery (EOR) method is needed to achieve a satisfactory recovery factor. The paper focuses on an experimental investigation of the efficiency of water alternating sour and high-nitrogen (~85% N2) natural gas injection (WAG) in mixed-wetted carbonates that are crucial reservoir rocks for Polish oil fields. The foam-assisted water alternating gas method (FAWAG) was also tested. Both were compared with continuous water injection (CWI) and continuous gas injection (CGI). A series of coreflooding experiments were conducted within reservoir conditions (T = 126 ℃, P = 270 bar) on composite cores, and each consisted of four reservoir dolomite core plugs and was saturated with the original reservoir fluids. In turn, some of the experiments were conducted on artificially fractured cores to evaluate the impact of fractures on recovery efficiency. The performance evaluation of the tested methods was carried out by comparing oil recoveries from non-fractured composite cores, as well as fractured. In the case of non-fractured cores, the WAG injection outperformed continuous gas injection (CGI) and continuous water injection (CWI). As expected, the presence of fractures significantly reduced performance of WAG, CGI and CWI injection modes. In contrast, with regard to FAWAG, deployment of foam flow in the presence of fractures remarkably enhanced oil recovery, which confirms the possibility of using the FAWAG method in situations of premature gas breakthrough. The positive results encourage us to continue the research of the potential uses of this high-nitrogen natural gas in EOR, especially in the view of the utilization of gas reservoirs with advantageous location, high reserves and reservoir energy. |
| Databáze: | OpenAIRE |
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