Performance Evaluation of CO2 Huff-n-Puff Gas Injection in Shale Gas Condensate Reservoirs
When the reservoir pressure is decreased lower than the dew point pressure in shale gas condensate reservoirs, condensate would be formed in the formation. Condensate accumulation severely reduces the commercial production of shale gas condensate reservoirs. Seeking ways to mitigate condensate in th...
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doaj-52459d1760734d68848eae9e9e1149132020-11-25T01:30:08ZengMDPI AGEnergies1996-10732018-12-011214210.3390/en12010042en12010042Performance Evaluation of CO2 Huff-n-Puff Gas Injection in Shale Gas Condensate ReservoirsXingbang Meng0Zhan Meng1Jixiang Ma2Tengfei Wang3Petroleum Engineering, China University of Petroleum (East China), Qingdao 266000, ChinaPetroleum Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, Regina, SK S4S 042, CanadaPetroChina Huabei Oilfield Company, Renqiu 062552, ChinaPetroleum Engineering, China University of Petroleum (East China), Qingdao 266000, ChinaWhen the reservoir pressure is decreased lower than the dew point pressure in shale gas condensate reservoirs, condensate would be formed in the formation. Condensate accumulation severely reduces the commercial production of shale gas condensate reservoirs. Seeking ways to mitigate condensate in the formation and enhance both condensate and gas recovery in shale reservoirs has important significance. Very few related studies have been done. In this paper, both experimental and numerical studies were conducted to evaluate the performance of CO2 huff-n-puff to enhance the condensate recovery in shale reservoirs. Experimentally, CO2 huff-n-puff tests on shale core were conducted. A theoretical field scale simulation model was constructed. The effects of injection pressure, injection time, and soaking time on the efficiency of CO2 huff-n-puff were examined. Experimental results indicate that condensate recovery was enhanced to 30.36% after 5 cycles of CO2 huff-n-puff. In addition, simulation results indicate that the injection period and injection pressure should be optimized to ensure that the pressure of the main condensate region remains higher than the dew point pressure. The soaking process should be determined based on the injection pressure. This work may shed light on a better understanding of the CO2 huff-n-puff- enhanced oil recovery (EOR) strategy in shale gas condensate reservoirs.http://www.mdpi.com/1996-1073/12/1/42CO2 huff-n-puffcondensate recoveryshale gas condensate reservoir |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xingbang Meng Zhan Meng Jixiang Ma Tengfei Wang |
spellingShingle |
Xingbang Meng Zhan Meng Jixiang Ma Tengfei Wang Performance Evaluation of CO2 Huff-n-Puff Gas Injection in Shale Gas Condensate Reservoirs Energies CO2 huff-n-puff condensate recovery shale gas condensate reservoir |
author_facet |
Xingbang Meng Zhan Meng Jixiang Ma Tengfei Wang |
author_sort |
Xingbang Meng |
title |
Performance Evaluation of CO2 Huff-n-Puff Gas Injection in Shale Gas Condensate Reservoirs |
title_short |
Performance Evaluation of CO2 Huff-n-Puff Gas Injection in Shale Gas Condensate Reservoirs |
title_full |
Performance Evaluation of CO2 Huff-n-Puff Gas Injection in Shale Gas Condensate Reservoirs |
title_fullStr |
Performance Evaluation of CO2 Huff-n-Puff Gas Injection in Shale Gas Condensate Reservoirs |
title_full_unstemmed |
Performance Evaluation of CO2 Huff-n-Puff Gas Injection in Shale Gas Condensate Reservoirs |
title_sort |
performance evaluation of co2 huff-n-puff gas injection in shale gas condensate reservoirs |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2018-12-01 |
description |
When the reservoir pressure is decreased lower than the dew point pressure in shale gas condensate reservoirs, condensate would be formed in the formation. Condensate accumulation severely reduces the commercial production of shale gas condensate reservoirs. Seeking ways to mitigate condensate in the formation and enhance both condensate and gas recovery in shale reservoirs has important significance. Very few related studies have been done. In this paper, both experimental and numerical studies were conducted to evaluate the performance of CO2 huff-n-puff to enhance the condensate recovery in shale reservoirs. Experimentally, CO2 huff-n-puff tests on shale core were conducted. A theoretical field scale simulation model was constructed. The effects of injection pressure, injection time, and soaking time on the efficiency of CO2 huff-n-puff were examined. Experimental results indicate that condensate recovery was enhanced to 30.36% after 5 cycles of CO2 huff-n-puff. In addition, simulation results indicate that the injection period and injection pressure should be optimized to ensure that the pressure of the main condensate region remains higher than the dew point pressure. The soaking process should be determined based on the injection pressure. This work may shed light on a better understanding of the CO2 huff-n-puff- enhanced oil recovery (EOR) strategy in shale gas condensate reservoirs. |
topic |
CO2 huff-n-puff condensate recovery shale gas condensate reservoir |
url |
http://www.mdpi.com/1996-1073/12/1/42 |
work_keys_str_mv |
AT xingbangmeng performanceevaluationofco2huffnpuffgasinjectioninshalegascondensatereservoirs AT zhanmeng performanceevaluationofco2huffnpuffgasinjectioninshalegascondensatereservoirs AT jixiangma performanceevaluationofco2huffnpuffgasinjectioninshalegascondensatereservoirs AT tengfeiwang performanceevaluationofco2huffnpuffgasinjectioninshalegascondensatereservoirs |
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