Study on mechanism of Gemini surfactant inhibiting acid rock reaction rate

Zhao, Feng; Wang, Shibin; Shen, Xin; Guo, Jianchun; Liu, Yuxuan

doi:10.1016/j.colsurfa.2019.123629

Cited by 20 publications

(15 citation statements)

References 26 publications

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“…N,N-bis-(tetradecyldimethyl)-1,2-dibromodiammonium (abbreviation 14-4-14), N,N′-bis(hexadecyldimethyl)-1,2-dibromobutylammonium (abbreviation 16-4-16), and N,N′-bis(octadecyldimethyl)-1,2-dibromobutylammonium (abbreviation 18-4-18) were synthesized via similar reaction routes. 34 The structure of the gemini surfactants is shown in Figure 1b−e. Calcite was purchased from the Hangzhou Yuhang District Renhe Specimen Factory.…”

Section: ■ Experimental and Simulation Sectionmentioning

confidence: 99%

“…32,33 However, there are only a few studies on the use of surfactants for adsorption on rocks to isolate hydrogen ion. 34,35 In this study, a series of gemini surfactants were synthesized to study the effect of their carbon length on the inhibition of the acid-rock reaction rate. The properties of gemini surfactants were studied using density functional theory (DFT) calculations and conductivity.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In recent years, a significant part of the world’s conventional hydrocarbon reserves has been found in carbonate reservoirs . Acid fracturing is a widely accepted method for exploiting carbonate reservoirs. − The success of this treatment depends on controlling the acid-rock reaction rate. , To do this, researchers have developed a series of HCl-based acid fluids, such as gelled acids, emulsified acids, and surfactant-based acids. , The inhibition reaction rate mechanism of these acid systems increases the viscosity of the system. , However, there are only a few studies on the use of surfactants for adsorption on rocks to isolate hydrogen ion. , …”

Section: Introductionmentioning

confidence: 99%

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Experimental and Molecular Dynamics Simulation Study on the Effects of the Carbon Chain Length of Gemini Surfactants on the Inhibition of the Acid-Rock Reaction Rate

2021

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A series of gemini surfactants were synthesized to examine their adsorption properties. The properties of gemini surfactants, including critical micelle concentration, electrostatic potential distributions, charge, occupied volume, lowest unoccupied molecular orbital (LUMO), and highest occupied molecular orbital (HOMO), were evaluated using conductivity and density functional theory (DFT) calculations. The calculation results indicated that the electrostatic potential distributions were similar among the four gemini surfactants. Moreover, surfactants with longer carbon chains are more likely to be oblique on the rock surface according to the energy gap between the HOMO of the surfactants and the LUMO of the calcite surface. Experimental tests and molecular dynamics (MD) simulations were conducted to analyze the calcite–surfactant interactions. Combined with the free energy (ΔG) based on the contact angle and adsorption energy (E) based on MD simulation, the adsorption ability increases as the carbon chain length decreases. MD simulation is used to understand the form of surfactant molecules on the calcite at an atomic scale at different times. An obvious aggregation of gemini surfactants was found with an increase in the carbon chain length, which reduces the adsorption density and covered area of the surfactant. The adsorption behavior of the gemini surfactant is beneficial for isolating H+ transfer and retarding the acid reaction with the rock. The retarding ability and etching morphology were studied by acid etching. The acid-rock reaction rate showed that 12-4-12 had the best inhibition performance. Meanwhile, the uneven surface pattern following 12-4-12 etching is beneficial for maintaining the acid fracturing conductivity.

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Section: ■ Experimental and Simulation Sectionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and Molecular Dynamics Simulation Study on the Effects of the Carbon Chain Length of Gemini Surfactants on the Inhibition of the Acid-Rock Reaction Rate

2021

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“…Chen et al [ 26 ] studied the role of high salinity conditions on gemini surfactants and found the lowest adsorption density values in the presence of salts. Zhao et al synthesized cationic gemini surfactants containing different hydrophobic tail lengths and studied the role of the hydrophobic tail on adsorption capacities and adsorption morphologies [ 27 ]. It was found that the gemini cationic surfactant can prevent the acid–rock reaction by creating a monolayer on the rock surface.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Study of Novel Gemini Cationic Surfactant in Carbonate Reservoir Cores—Influence of Critical Parameters

et al. 2022

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Surfactant flooding is an enhanced oil recovery method that recovers residual and capillary trapped oil by improving pore-scale displacement efficiency. Low retention of injected chemicals is desired to ensure an economic and cost-effective recovery process. This paper examines the adsorption behavior of a novel gemini cationic surfactant on carbonate cores. The rock cores were characterized using an X-ray diffraction (XRD) spectroscope. In addition, the influence of critical parameters on the dynamic adsorption of the cationic gemini surfactant was studied by injecting the surfactant solution through carbonate cores in a core flooding apparatus until an equilibrium state was achieved. The concentration of surfactant was observed using high performance liquid chromatography. Experimental results showed that an increasing surfactant concentration causes higher retention of the surfactant. Moreover, increasing the flow rate to 0.2 mL/min results in lowering the surfactant retention percentage to 17%. At typical high salinity and high temperature conditions, the cationic gemini surfactant demonstrated low retention (0.42 mg/g-rock) on an Indiana limestone core. This study extends the frontier of knowledge in gemini surfactant applications for enhanced oil recovery.

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“…The surface tension, adhesion work, and AFM are used to investigate the effect of hydrophobic chain length and concentration of surfactant on surface activities adsorption morphology and adsorption capacities. 29 Tariq investigated the performance of the chelating agents, namely, ethylenediaminetetraacetic acid (EDTA) and glutamic acid N , N -diacetic acid (GLDA), in creating sufficient fracture conductivity. Several experiments/measurements were performed, the lab-scale outcomes were reproduced numerically, and field-scale simulations were carried out.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Autogenic Acid Fluid System of a High-Temperature Carbonate Reservoir by Acid Fracturing

Guo

Liu

et al. 2022

ACS Omega

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As an important part of the acid fracturing process of carbonate reservoir, the performance of acid fracturing working fluid directly affects the stimulation effect of oil wells. In this paper, formaldehyde (agent A) and ammonium chloride (agent B) were used as the matrix. Several aldehydes with different volume ratios were prepared. The acid ratio with the highest acid yield was selected by the sodium hydroxide titration experiment. The results show that when the volume ratio of agent A to agent B is 1:1.3, the acid production capacity is the strongest. The pH values at several time points in the process of acid reaction were measured by a pen pH meter. The relationship curve between acid production capacity and time was obtained. The acid production capacity increased with time. It tends to be stable after a certain time. The experiment of acid rock reaction kinetics shows that the reaction rate between acid and rock decreases with the extension of time. The reaction time can reach 6 h. The reaction rate of autogenic acid under different temperatures and concentrations ranges from 6.61 × 10 –7 to 9.49 × 10 –7 mol/(s·cm 2 ) within 6 h. Therefore, it indicates that the reaction time between autogenic acid and carbonate rock is long and the reaction rate is low. It is beneficial to improve the acid treatment effect of the carbonate reservoir. The conductivity experiments show that at different temperatures, with the increase of sealing pressure, the etching ability of autogenic acid decreases. The etching effect is better at 338 K. After etching, the permeability and conductivity of the rock slab of 5 MPa closure pressure are 227 D and 72.62 D·cm, respectively. To sum up, this autogenic acid is an effective working fluid in the acid fracturing process of the carbonate reservoir. It can obviously reduce the reaction rate of acid rock and has certain conductivity.

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Study on mechanism of Gemini surfactant inhibiting acid rock reaction rate

Cited by 20 publications

References 26 publications

Experimental and Molecular Dynamics Simulation Study on the Effects of the Carbon Chain Length of Gemini Surfactants on the Inhibition of the Acid-Rock Reaction Rate

Experimental and Molecular Dynamics Simulation Study on the Effects of the Carbon Chain Length of Gemini Surfactants on the Inhibition of the Acid-Rock Reaction Rate

Adsorption Study of Novel Gemini Cationic Surfactant in Carbonate Reservoir Cores—Influence of Critical Parameters

Experimental Study on the Autogenic Acid Fluid System of a High-Temperature Carbonate Reservoir by Acid Fracturing

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