TY  - JOUR
KW  - Alkalinity; Computerized tomography; Enhanced recovery; Floods; Foams; Gases; Injection (oil wells); Sandstone; Secondary recovery; Surface active agents
KW  -  Alkaline; Continuous gas injections; Core flood experiments; Displacement mechanisms; Enhance oil recoveries; Enhanced oil recovery; Immiscible gas injection; Water alternating gas
KW  -  Oil well flooding
KW  -  comparative study; displacement; enhanced oil recovery; fluid injection; foam; immiscible fluid; reservoir flooding; sandstone; surfactant
PB  - Springer
A1  - Janssen, M.T.G.
A1  - Pilus, R.M.
A1  - Zitha, P.L.J.
AV  - none
SP  - 101
ID  - scholars14096
EP  - 134
TI  - A Comparative Study of Gas Flooding and Foam-Assisted Chemical Flooding in Bentheimer Sandstones
IS  - 1
JF  - Transport in Porous Media
VL  - 131
SN  - 01693913
N1  - cited By 22
Y1  - 2020///
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85059583139&doi=10.1007%2fs11242-018-01225-3&partnerID=40&md5=2eb849c64235d598d6ad420120f77e73
N2  - A laboratory study of principal immiscible gas flooding schemes is reported. Very well-controlled experiments on continuous gas injection, water-alternating-gas (WAG) and alkaline�??surfactant�??foam (ASF) flooding were conducted. The merits of WAG and ASF compared to continuous gas injection were examined. The impact of ultra-low oil�??water (o/w) interfacial tension (IFT), an essential feature of the ASF scheme along with foaming, on oil mobilisation and displacement of residual oil to waterflood was also assessed. Incremental oil recoveries and related displacement mechanisms by ASF and WAG compared to continuous gas injection were investigated by conducting CT-scanned core-flood experiments using n-hexadecane and Bentheimer sandstone cores. Ultimate oil recoveries for WAG and ASF at under-optimum salinity (o/w IFT of 10�??1� mN/m) were found to be similar 60 ± 5% of the oil initially in place (OIIP). However, ultimate oil recovery for ASF at (near-)optimum salinity (o/w IFT of 10�??2 mN/m) reached 74 ± 8% of the OIIP. Results support the idea that WAG increases oil recovery over continuous gas injection by drastically increasing the trapped gas saturation at the end of the first few WAG cycles. ASF flooding was able to enhance oil recovery over WAG by effectively lowering o/w IFT (< 10�??1� mN/m) for oil mobilisation. ASF at (near-)optimum salinity increased clean oil fraction in the production stream over under-optimum salinity ASF. © 2019, Springer Nature B.V.
ER  -