Hydrolytic Stability of Ethoxylated Sulfonates

Talley, Larry D.

doi:10.2118/18492-ms

Cited by 6 publications

(1 citation statement)

References 5 publications

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“…This experiment demonstrates that the presence of oxygen in the preparation stage will significantly speed up the hydrolysis of sulfonate groups. 38 This should be considered during application.…”

Section: Effects Of Oxygen On Long-term Thermal Stabilitymentioning

confidence: 99%

Long-Term Thermal Stability of Ionic Surfactants for Improving Oil Production at High-Salinity High-Temperature Conditions

Hou,

Huang,

Alotaibi

et al. 2024

ACS Omega

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Surfactants with stable chemical structures and robust ability are required to lower interfacial tension and stabilize emulsions for successful chemical injection applications. This work selected six surfactants, dodecyl carboxylic sodium (LAS), dodecyl sulfonate dodecyl sodium (SLS), dodecyl sulfate sodium (SDS), dodecyltrimethylammonium bromide (DTAB), 3-(N,N-dimethylmyristylammonio) propanesulfonate (SB3−14) and a sulfobetaine formulation (PCT-10), and systematically investigated the ionictype effects on thermal stability at 95 °C for 150 days in highsalinity water (total dissolved solids (TDS) = 57,600 ppm). With characterizations of aged samples performed through a spinning drop tensiometer, high-performance liquid chromatography, and infrared spectroscopy, it can be seen that the long-term stability sequence of ionic surfactants in solutions is sulfobetaine ≈ quaternary ammonium > sulfonate > sulfate > carboxylate. The carboxylate possibly precipitates out from the solution in the acid form, and the sulfonate and sulfate decompositions are due to the hydrolysis of the anionic head, forming alcohol and NaHSO 3 /NaHSO 4 . Obvious decomposition of sulfobetaine and quaternary ammonium was not observed, but these molecules might suffer the elimination of the ionic head, forming the corresponding alkene and amine. The results also show that the dissolved oxygen in the solution preparation significantly sped up the degradation of sulfonates. At last, the emulsion stability tests of crude oil in surfactant solutions showed that sulfobetaine surfactants retained the highest emulsifying ability after thermal aging and thus are promising candidates for long-term chemical injection in hightemperature high-salinity reservoirs.

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Section: Effects Of Oxygen On Long-term Thermal Stabilitymentioning

confidence: 99%

Long-Term Thermal Stability of Ionic Surfactants for Improving Oil Production at High-Salinity High-Temperature Conditions

Hou,

Huang,

Alotaibi

et al. 2024

ACS Omega

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Surfactant in Petroleum Industry

Sagir

Mushtaq

Tahir

et al. 2020

Surfactants for Enhanced Oil Recovery Applications

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Long Term Thermal Stability of Chemical EOR Surfactants

Hocine

Pousset

Courtaud

et al. 2018

Day 2 Tue, March 27, 2018

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Chemical enhanced oil recovery techniques progressively emerge as a means to increase mature oil fields production. In particular, surfactant flooding allows increasing oil production by lowering the interfacial tension between injection water and crude oil. The effectiveness of surfactants depends on their chemical stability over an extended period of time, which could be impaired by reservoir conditions in terms of temperature, salinity and oxidative conditions. Within the frame of this work, we monitored the chemical stability of several families of anionic surfactants in water, including alkyl ether sulfates, alkyl glyceryl ether sulfonates, alkyl benzene sulfonates and internal olefin sulfonates. Analytical methods were first developed to evaluate the chemical stability of these surfactants, including high pressure liquid chromatography (HPLC) and mixed-indicator titration techniques. The thermal stability of industrially representative surfactants was then monitored as a function of time at high temperature. Anionic surfactants designed to withstand high temperature conditions proved to be stable in oxygen controlled environments over a very long storage time. Alkyl benzene sulfonates, internal olefin sulfonates and alkyl glyceryl ether sulfonates (or alkyl alkoxyl glyceryl sulfonates) notably showed a very good stability over a year–long storage at 100°C. Alkyl ether sulfates (or alkyl alkoxy sulfates) showed by contrast a poor stability at 100°C as all the active contents were degraded in twenty four hours in deionized water and around four months in an alkaline buffer. The hydrolysis of the sulfate moiety at high temperature is probably responsible for the limited stability of alkyl ether sulfates at high temperature. This study highlights the strong benefit of using sulfonated anionic surfactants in EOR processes applied at high temperatures. In particular, it demonstrates the advantage of replacing alkyl ether sulfates by alkyl glyceryl ether sulfonates in order to insure the long term stability of a formulation developed to be injected during several years.

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Hydrolytic Stability of Ethoxylated Sulfonates

Cited by 6 publications

References 5 publications

Long-Term Thermal Stability of Ionic Surfactants for Improving Oil Production at High-Salinity High-Temperature Conditions

Long-Term Thermal Stability of Ionic Surfactants for Improving Oil Production at High-Salinity High-Temperature Conditions

Surfactant in Petroleum Industry

Long Term Thermal Stability of Chemical EOR Surfactants

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