The effect of CO2-enriched water salinity on enhancing oil recovery and its potential formation damage: an experimental study on shaly sandstone reservoirs
Abstract Many experimental investigations on carbonated water injection (CWI) have shown an increase in oil recovery which CWI is defined as the process of injecting CO2-saturated water in oil reservoirs as a displacing fluid. In every enhanced oil recovery method, the potential formation damage of...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2020-04-01
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| Series: | Journal of Petroleum Exploration and Production Technology |
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| Online Access: | https://doi.org/10.1007/s13202-020-00888-3 |
| _version_ | 1818027048009990144 |
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| author | Ehsan Yazdani Sadati Eghbal Sahraei Milad Rahnema Sohail Rashidi Aghdam Mahsheed Reyhani |
| author_facet | Ehsan Yazdani Sadati Eghbal Sahraei Milad Rahnema Sohail Rashidi Aghdam Mahsheed Reyhani |
| author_sort | Ehsan Yazdani Sadati |
| collection | DOAJ |
| description | Abstract Many experimental investigations on carbonated water injection (CWI) have shown an increase in oil recovery which CWI is defined as the process of injecting CO2-saturated water in oil reservoirs as a displacing fluid. In every enhanced oil recovery method, the potential formation damage of the injected fluid is considered. This is due to the fact that the injection of incompatible fluids often causes clay swelling and fines migration and thus impairs the formation permeability. Permeability reduction by clay particles mostly depends on its distribution which can be pore lining, pore bridging, dispersed or combination of these causing pore blocking or pore-throat diameter reduction. Besides, fine migration is considered as an important mechanism of recovery improvement during injection of low-salinity water in sandstone oil reservoirs. The present paper investigates the impact of injection of carbonated water and brines with the different salt concentrations on oil recovery and formation damage focusing on permeability variation. The investigation has been done on 12 relatively homogeneous clay-containing sandstone cores, while the compositions of the injection water were varied from 40,000 to 1000 ppm, at 176° F and 2000 psi. The amount of recovery improvement and permeability drop recorded in all tests and the fine effluent of two experiments were analysed using XRD, one for CWI and one for WF (water flooding). In all salinities, CWI has shown more oil recovery improvement than conventional water. CWI of 40,000 ppm showed the minimum permeability reduction of 6 percent, while the highest permeability was obtained by injection of water with 1000 ppm. Maximum ultimate oil recoveries of 61.2% and 42% were achieved by 1000 ppm both for CWI and WF, respectively. In comparison with brine injection, CWI resulted in more permeability drop in salinity above critical salt concentration (CSC), while below CSC, WF has caused more formation damage than CWI. Experimental results also showed that fine migration was the main reason behind formation damage. It was also revealed that permeability was significantly reduced due to fine production in the effluent. |
| first_indexed | 2024-12-10T04:41:42Z |
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| id | doaj.art-5095574cd9284175acf39bf4a926bde6 |
| institution | Directory Open Access Journal |
| issn | 2190-0558 2190-0566 |
| language | English |
| last_indexed | 2024-12-10T04:41:42Z |
| publishDate | 2020-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of Petroleum Exploration and Production Technology |
| spelling | doaj.art-5095574cd9284175acf39bf4a926bde62022-12-22T02:01:52ZengSpringerOpenJournal of Petroleum Exploration and Production Technology2190-05582190-05662020-04-011083791380210.1007/s13202-020-00888-3The effect of CO2-enriched water salinity on enhancing oil recovery and its potential formation damage: an experimental study on shaly sandstone reservoirsEhsan Yazdani Sadati0Eghbal Sahraei1Milad Rahnema2Sohail Rashidi Aghdam3Mahsheed Reyhani4Sahand Oil and Gas Research Institute, Petroleum and Natural Gas Engineering Faculty, Sahand University of TechnologySahand Oil and Gas Research Institute, Petroleum and Natural Gas Engineering Faculty, Sahand University of TechnologySahand Oil and Gas Research Institute, Petroleum and Natural Gas Engineering Faculty, Sahand University of TechnologySahand Oil and Gas Research Institute, Petroleum and Natural Gas Engineering Faculty, Sahand University of TechnologySahand Oil and Gas Research Institute, Petroleum and Natural Gas Engineering Faculty, Sahand University of TechnologyAbstract Many experimental investigations on carbonated water injection (CWI) have shown an increase in oil recovery which CWI is defined as the process of injecting CO2-saturated water in oil reservoirs as a displacing fluid. In every enhanced oil recovery method, the potential formation damage of the injected fluid is considered. This is due to the fact that the injection of incompatible fluids often causes clay swelling and fines migration and thus impairs the formation permeability. Permeability reduction by clay particles mostly depends on its distribution which can be pore lining, pore bridging, dispersed or combination of these causing pore blocking or pore-throat diameter reduction. Besides, fine migration is considered as an important mechanism of recovery improvement during injection of low-salinity water in sandstone oil reservoirs. The present paper investigates the impact of injection of carbonated water and brines with the different salt concentrations on oil recovery and formation damage focusing on permeability variation. The investigation has been done on 12 relatively homogeneous clay-containing sandstone cores, while the compositions of the injection water were varied from 40,000 to 1000 ppm, at 176° F and 2000 psi. The amount of recovery improvement and permeability drop recorded in all tests and the fine effluent of two experiments were analysed using XRD, one for CWI and one for WF (water flooding). In all salinities, CWI has shown more oil recovery improvement than conventional water. CWI of 40,000 ppm showed the minimum permeability reduction of 6 percent, while the highest permeability was obtained by injection of water with 1000 ppm. Maximum ultimate oil recoveries of 61.2% and 42% were achieved by 1000 ppm both for CWI and WF, respectively. In comparison with brine injection, CWI resulted in more permeability drop in salinity above critical salt concentration (CSC), while below CSC, WF has caused more formation damage than CWI. Experimental results also showed that fine migration was the main reason behind formation damage. It was also revealed that permeability was significantly reduced due to fine production in the effluent.https://doi.org/10.1007/s13202-020-00888-3EORCWI (Carbonated Water Injection)Formation damageClay fine migration |
| spellingShingle | Ehsan Yazdani Sadati Eghbal Sahraei Milad Rahnema Sohail Rashidi Aghdam Mahsheed Reyhani The effect of CO2-enriched water salinity on enhancing oil recovery and its potential formation damage: an experimental study on shaly sandstone reservoirs Journal of Petroleum Exploration and Production Technology EOR CWI (Carbonated Water Injection) Formation damage Clay fine migration |
| title | The effect of CO2-enriched water salinity on enhancing oil recovery and its potential formation damage: an experimental study on shaly sandstone reservoirs |
| title_full | The effect of CO2-enriched water salinity on enhancing oil recovery and its potential formation damage: an experimental study on shaly sandstone reservoirs |
| title_fullStr | The effect of CO2-enriched water salinity on enhancing oil recovery and its potential formation damage: an experimental study on shaly sandstone reservoirs |
| title_full_unstemmed | The effect of CO2-enriched water salinity on enhancing oil recovery and its potential formation damage: an experimental study on shaly sandstone reservoirs |
| title_short | The effect of CO2-enriched water salinity on enhancing oil recovery and its potential formation damage: an experimental study on shaly sandstone reservoirs |
| title_sort | effect of co2 enriched water salinity on enhancing oil recovery and its potential formation damage an experimental study on shaly sandstone reservoirs |
| topic | EOR CWI (Carbonated Water Injection) Formation damage Clay fine migration |
| url | https://doi.org/10.1007/s13202-020-00888-3 |
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