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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Main Authors: Xingbang Meng, Zhan Meng, Jixiang Ma, Tengfei Wang
Format: Article
Language:English
Published: MDPI AG 2018-12-01
Series:Energies
Subjects:
Online Access:http://www.mdpi.com/1996-1073/12/1/42
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spelling 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
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AT zhanmeng performanceevaluationofco2huffnpuffgasinjectioninshalegascondensatereservoirs
AT jixiangma performanceevaluationofco2huffnpuffgasinjectioninshalegascondensatereservoirs
AT tengfeiwang performanceevaluationofco2huffnpuffgasinjectioninshalegascondensatereservoirs
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