Adsorption of Ethoxylated Sulfonates on Limestone

Çelik, M. S.; Shakeel, Atif; Al-Yousef, Hasan Y.; Al-Hashim, Hasan S.

doi:10.1177/026361748800500104

Cited by 11 publications

(10 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The relation of decreased surfactant adsorption as ethoxylation degree increases has also been reported by several other authors, and observations for present experiments are in line with work performed previously on this subject (Celik et al 1988;Austad et al 1987Austad et al , 1992bAustad 1993;Paktinat 1991;Curbelo et al 2007). …”

Section: Resultssupporting

confidence: 93%

“…The surfactant aggregates on the solid surface, thereby, take a more compact structure and the adsorption would increase further as hydrocarbon chains from the aqueous phase are transferred into the hydrophobic interior of the aggregates. Celik et al (1988) observed a similar relation when they investigated the adsorption of anionic surfactants with different ethoxylation degree onto limestone at 25, 50, and 90 C. Increased adsorption as the temperature increased was suggested to have been caused by the gradual desolvation of the EO chain with increasing temperature. This phenomenon increased the hydrophobicity of the surfactant aggregates that leads to enhanced surface activity of the surfactant leading to high adsorption.…”

Section: Resultsmentioning

confidence: 64%

“…The adsorption mechanism for anionic surfactants onto chalk is thought to be governed mainly by the electrostatic forces operating between the solid surface and the surfactant species (Celik et al 1988). Surface charge of the chalk plugs used during this work is expected to be positive for the conditions present during the coreflooding experiments because of pH and brine compositions (Somasundaran and Agar 1967).…”

Section: Resultsmentioning

confidence: 99%

“…The surfactant molecules will, therefore, experience increased affinity for the water phase, and fewer surfactant molecules will adsorb to the solid surface. Celik et al (1988) evaluated EO sulfonates and anionic surfactants adsorption onto Saudi Arabian limestone and studied the effect of ethoxylation degree on adsorption. Surfactants with ethoxylation degrees of 8, 10, 15, and 18 were used for static experiments.…”

Section: Resultsmentioning

confidence: 99%

“…However, this does not seem to be the case for EO anionic surfactants. It has been found that as the temperature increases, the solubility of EO surfactants in water or brine phase rather decreases (Celik et al 1988). The hydrogen bonds created between water molecules and the oxygen atom of the ethoxylation group structure are thought to be broken as the temperature increases.…”

Section: Resultsmentioning

confidence: 99%

See 4 more Smart Citations

Retention of CO2-Foaming Agents on Chalk: Effects of Surfactant Structure, Temperature, and Residual-Oil Saturation

Fjelde

Zuta

Hauge

2009

SPE Reservoir Evaluation &Amp; Engineering

View full text Add to dashboard Cite

Injection of carbon dioxide (CO 2 ) is a well-known enhanced-oilrecovery (EOR) technique. Formation of stable foam inside the reservoir can improve macroscopic sweep efficiency. On the other hand, retention of surfactants decreases the cost-efficiency of the EOR process. This paper presents flow-through retention experiments with CO 2 -foaming agents on outcrop Liege chalk plugs at two different temperatures: 55 and 70 C. Two branched ethoxylated (EO) sulfonates with different ethoxylation degree, S1 (EO = 7) and S2 (EO = 12), were used. The aim was to investigate the effect of ethoxylation degree on surfactant retention. Furthermore, the effects of temperature and residual oil on surfactant retention were studied. The effect of waterflooding followed by CO 2 flooding on surfactant retention at reservoir conditions was also examined. Partitioning of the foaming agents between water and oil phases was studied.Results show that increasing the ethoxylation degree of the surfactant decreases the retention on chalk cores saturated with formation water at 55 C. S2, which was found to give the lowest retention at 55 C, was found to have a higher retention at 70 C. The presence of residual-oil saturation after waterflooding (S orw ) decreased the retention of S1 and increased the retention of S2 in comparison to the absence of residual oil. The retention of S2 after waterflooding followed by CO 2 flooding at 340 bar and 55 C was in the same range as retention on 100%-water-saturated core, but significantly lower than retention in residual-oilsaturated cores. The experiments have shown that not only are surfactant structure and temperature important for the retention of surfactants, but also the presence of oil.

show abstract