An Experimental Study of CO2-low Salinity Water Alternating Gas Injection in Sandstone Heavy Oil Reservoirs
Several studies have shown that oil recovery significantly increased by low salinity water flooding (LSWF) in sandstones. However, mechanism of oil recovery improvement is still controversial. CO2 that develops buffer in presence of water is expected as a deterrent factor in LSWF efficiency based on...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Petroleum University of Technology
2013-07-01
|
Series: | Iranian Journal of Oil & Gas Science and Technology |
Subjects: | |
Online Access: | http://ijogst.put.ac.ir/article_3643_c74d46ffe98d817b6eca81f0c1dc9cce.pdf |
id |
doaj-7d9405a75dc14627ab40ae8685e37768 |
---|---|
record_format |
Article |
spelling |
doaj-7d9405a75dc14627ab40ae8685e377682020-11-24T23:16:16ZengPetroleum University of TechnologyIranian Journal of Oil & Gas Science and Technology2345-24122345-24202013-07-0123374710.22050/ijogst.2013.36433643An Experimental Study of CO2-low Salinity Water Alternating Gas Injection in Sandstone Heavy Oil ReservoirsHadi Zolfaghari0Alireza Zebarjadi1Omid Shahrokhi2Mohammad Hosein Ghazanfari3Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, IranDepartment of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, IranInstitute of Petroleum Engineering, Heriot-Watt University, Edinburgh, ScotlandDepartment of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, IranSeveral studies have shown that oil recovery significantly increased by low salinity water flooding (LSWF) in sandstones. However, mechanism of oil recovery improvement is still controversial. CO2 that develops buffer in presence of water is expected as a deterrent factor in LSWF efficiency based on mechanism of IFT reduction due to pH uprising. No bright evidence in literature supports this idea. Here, a set of core floods including a pair of CO2 WAG and a pair of water injection tests are conducted and, the efficiency of LSWF and high salinity water flooding (HSWF) were compared for each pair. HSWF was followed by LSWF in tertiary mode. Results showed that not only CO2 does not deteriorate LSWF recovery efficiency, but also improves recovery. Since CO2-low salinity WAG showed best performance among types by constant pore volume injected. Positive results in both secondary and tertiary modes with Kaolinite free samples used here showed that Kaolinite release is not the critical phenomenon in LSWF brisk performance. Also different pressure behaviour of CO2 WAG processes in comparison with reported behaviour of LSWF proves that LSWF performance may not depend on how pressure changes through flooding.http://ijogst.put.ac.ir/article_3643_c74d46ffe98d817b6eca81f0c1dc9cce.pdfLow salinityCarbon dioxideWAGHeavy oilSand stones |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hadi Zolfaghari Alireza Zebarjadi Omid Shahrokhi Mohammad Hosein Ghazanfari |
spellingShingle |
Hadi Zolfaghari Alireza Zebarjadi Omid Shahrokhi Mohammad Hosein Ghazanfari An Experimental Study of CO2-low Salinity Water Alternating Gas Injection in Sandstone Heavy Oil Reservoirs Iranian Journal of Oil & Gas Science and Technology Low salinity Carbon dioxide WAG Heavy oil Sand stones |
author_facet |
Hadi Zolfaghari Alireza Zebarjadi Omid Shahrokhi Mohammad Hosein Ghazanfari |
author_sort |
Hadi Zolfaghari |
title |
An Experimental Study of CO2-low Salinity Water Alternating Gas Injection in Sandstone Heavy Oil Reservoirs |
title_short |
An Experimental Study of CO2-low Salinity Water Alternating Gas Injection in Sandstone Heavy Oil Reservoirs |
title_full |
An Experimental Study of CO2-low Salinity Water Alternating Gas Injection in Sandstone Heavy Oil Reservoirs |
title_fullStr |
An Experimental Study of CO2-low Salinity Water Alternating Gas Injection in Sandstone Heavy Oil Reservoirs |
title_full_unstemmed |
An Experimental Study of CO2-low Salinity Water Alternating Gas Injection in Sandstone Heavy Oil Reservoirs |
title_sort |
experimental study of co2-low salinity water alternating gas injection in sandstone heavy oil reservoirs |
publisher |
Petroleum University of Technology |
series |
Iranian Journal of Oil & Gas Science and Technology |
issn |
2345-2412 2345-2420 |
publishDate |
2013-07-01 |
description |
Several studies have shown that oil recovery significantly increased by low salinity water flooding (LSWF) in sandstones. However, mechanism of oil recovery improvement is still controversial. CO2 that develops buffer in presence of water is expected as a deterrent factor in LSWF efficiency based on mechanism of IFT reduction due to pH uprising. No bright evidence in literature supports this idea. Here, a set of core floods including a pair of CO2 WAG and a pair of water injection tests are conducted and, the efficiency of LSWF and high salinity water flooding (HSWF) were compared for each pair. HSWF was followed by LSWF in tertiary mode. Results showed that not only CO2 does not deteriorate LSWF recovery efficiency, but also improves recovery. Since CO2-low salinity WAG showed best performance among types by constant pore volume injected. Positive results in both secondary and tertiary modes with Kaolinite free samples used here showed that Kaolinite release is not the critical phenomenon in LSWF brisk performance. Also different pressure behaviour of CO2 WAG processes in comparison with reported behaviour of LSWF proves that LSWF performance may not depend on how pressure changes through flooding. |
topic |
Low salinity Carbon dioxide WAG Heavy oil Sand stones |
url |
http://ijogst.put.ac.ir/article_3643_c74d46ffe98d817b6eca81f0c1dc9cce.pdf |
work_keys_str_mv |
AT hadizolfaghari anexperimentalstudyofco2lowsalinitywateralternatinggasinjectioninsandstoneheavyoilreservoirs AT alirezazebarjadi anexperimentalstudyofco2lowsalinitywateralternatinggasinjectioninsandstoneheavyoilreservoirs AT omidshahrokhi anexperimentalstudyofco2lowsalinitywateralternatinggasinjectioninsandstoneheavyoilreservoirs AT mohammadhoseinghazanfari anexperimentalstudyofco2lowsalinitywateralternatinggasinjectioninsandstoneheavyoilreservoirs AT hadizolfaghari experimentalstudyofco2lowsalinitywateralternatinggasinjectioninsandstoneheavyoilreservoirs AT alirezazebarjadi experimentalstudyofco2lowsalinitywateralternatinggasinjectioninsandstoneheavyoilreservoirs AT omidshahrokhi experimentalstudyofco2lowsalinitywateralternatinggasinjectioninsandstoneheavyoilreservoirs AT mohammadhoseinghazanfari experimentalstudyofco2lowsalinitywateralternatinggasinjectioninsandstoneheavyoilreservoirs |
_version_ |
1725587849624944640 |