Understanding viscosity reduction of a long-tail sulfobetaine viscoelastic surfactant by organic compounds

Fogang, Lionel Talley; Sultan, Abdullah S.; Kamal, Muhammad Shahzad

doi:10.1039/c7ra12538k

Cited by 37 publications

(34 citation statements)

References 27 publications

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“…In the drops from the precipitation zone, we observed tightly packed elongated structures with widths of $3.5-5 nm [Fig. 3(c)], which look similar to previously imaged cylindrical surfactant micelles (Fogang et al, 2018). We also observed structures with similar thickness but somewhat different organization, which probably likewise represent cylindrical micelles [Fig.…”

Section: Ns-tem Imaging Of Lipid Phasessupporting

confidence: 85%

Insights into the mechanism of high lipid–detergent crystallization of membrane proteins

et al. 2021

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Obtaining well diffracting crystals of membrane proteins is often challenging, but chances can be improved by crystallizing them in lipidic conditions that mimic their natural membrane environments. One approach is the high lipid–detergent (HiLiDe) method, which works by mixing the target protein with high concentrations of lipid and detergent prior to crystallization. Although this approach is convenient and flexible, understanding the effects of systematically varying lipid/detergent ratios and a characterization of the lipid phases that form during crystallization would be useful. Here, a HiLiDe phase diagram is reported for the model membrane protein MhsT, which tracks the precipitation and crystallization zones as a function of lipid and detergent concentrations, and is augmented with data on crystal sizes and diffraction properties. Additionally, the crystallization of SERCA1a solubilized directly with native lipids is characterized as a function of detergent concentration. Finally, HiLiDe crystallization drops are analysed with transmission electron microscopy, which among other features reveals liposomes, stacked lamellae that may represent crystal precursors, and mature crystals with clearly discernible packing arrangements. The results emphasize the significance of optimizing lipid/detergent ratios over broad ranges and provide insights into the mechanism of HiLiDe crystallization.

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Section: Ns-tem Imaging Of Lipid Phasessupporting

confidence: 85%

Insights into the mechanism of high lipid–detergent crystallization of membrane proteins

et al. 2021

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“…This amount of crude oil (or n -alkane) is about 10 times the value reported in the literature. 42 , 46 The compatibility of the worm-like micelles with oil is ascribed to the unique hydrophobic structure of this molecule. Most surfactants have long hydrocarbon chains as their hydrophobes; these hydrophobes are very lipophilic and solubilize oils in inner cores of the micelles leading to break up of cylindrical micelles into spherical micelles.…”

Section: Resultsmentioning

confidence: 99%

Oil-Tolerant Nonionic Worm-like Micellar Solution

et al. 2020

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The goal of this work is to study the effect of crude oil on worm-like micelles and identify any oil-tolerant systems. A new class of nonionic surfactants was synthesized that forms viscous worm-like micelles under a wide range of temperature and salinity conditions. Aqueous stability, rheology, cryogenic transmission electron microscopy imaging, and dynamic-light-scattering measurements were performed to understand properties, shape, and size of the micelles formed using these surfactants under different temperatures and salinity conditions and in the presence of hydrocarbons. These micellar solutions maintained high viscosity in the presence of small amounts (up to 8 vol %) of crude oils and pure hydrocarbons. Similar experiments were performed with conventional surfactant systems that were known to form worm-like micelles; they did not show oil tolerance. Larger alkanes and viscous crude oils affect the viscosity and transformation of cylindrical micelles less. These new surfactants are useful for oil and gas operations such as hydraulic fracturing, conformance control, and mobility control as they form viscous worm-like micelles in the presence of small amounts of crude oils.

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“…These fractures are then kept open using a proppant, thus preventing the closure of those fractures due to stresses that are acting on the formation. After the completion of the process, the injected fluids are broken into low viscosity liquids using breakers to enhance the flow back of the fluid to the surface [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Development of Chelating Agent-Based Polymeric Gel System for Hydraulic Fracturing

et al. 2018

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Hydraulic Fracturing is considered to be one of the most important stimulation methods. Hydraulic Fracturing is carried out by inducing fractures in the formation to create conductive pathways for the flow of hydrocarbon. The pathways are kept open either by using proppant or by etching the fracture surface using acids. A typical fracturing fluid usually consists of a gelling agent (polymers), cross-linkers, buffers, clay stabilizers, gel stabilizers, biocide, surfactants, and breakers mixed with fresh water. The numerous additives are used to prevent damage resulting from such operations, or better yet, enhancing it beyond just the aim of a fracturing operation. This study introduces a new smart fracturing fluid system that can be either used for proppant fracturing (high pH) or acid fracturing (low pH) operations in sandstone formations. The fluid system consists of glutamic acid diacetic acid (GLDA) that can replace several additives, such as cross-linker, breaker, biocide, and clay stabilizer. GLDA is also a surface-active fluid that will reduce the interfacial tension eliminating the water-blockage effect. GLDA is compatible and stable with sea water, which is advantageous over the typical fracturing fluid. It is also stable in high temperature reservoirs (up to 300 °F) and it is also environmentally friendly and readily biodegradable. The new fracturing fluid formulation can withstand up to 300 °F of formation temperature and is stable for about 6 h under high shearing rates (511 s−1). The new fracturing fluid formulation breaks on its own and the delay time or the breaking time can be controlled with the concentrations of the constituents of the fluid (GLDA or polymer). Coreflooding experiments were conducted using Scioto and Berea sandstone cores to evaluate the effectiveness of the developed fluid. The flooding experiments were in reasonable conformance with the rheological properties of the developed fluid regarding the thickening and breaking time, as well as yielding high return permeability.

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Understanding viscosity reduction of a long-tail sulfobetaine viscoelastic surfactant by organic compounds

Cited by 37 publications

References 27 publications

Insights into the mechanism of high lipid–detergent crystallization of membrane proteins

Insights into the mechanism of high lipid–detergent crystallization of membrane proteins

Oil-Tolerant Nonionic Worm-like Micellar Solution

Development of Chelating Agent-Based Polymeric Gel System for Hydraulic Fracturing

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