Adsorption II. Nonequilibrium adsorption of surfactants onto three reservoir cores from the Norwegian Continental Shelf. The effects of clay minerals

Austad, Tor; Bjørkum, Per Arne; Rolfsvag, T. A.

doi:10.1016/0920-4105(91)90032-i

Cited by 25 publications

(10 citation statements)

References 9 publications

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“…Similar behavior has been found by Austad et al (1991aAustad et al ( , 1991bAustad et al ( , 1992b. A product containing a mixture of an EO sulfonate and the corresponding nonionic alcohol was studied during a dynamic adsorption experiment at 70 C (Austad et al 1991a(Austad et al , 1991b(Austad et al , 1992b. The surfactant had an EO degree of 6, which resembles S1 in the present work, with 7 ethoxy groups.…”

Section: Resultssupporting

confidence: 81%

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

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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.

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Section: Resultssupporting

confidence: 81%

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

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“…After circulating some PVs of CLS solution, the concentration between the main flow path of the core and the flask was not affected by concentration gradients due to the dilution. 22 The CLS concentration loss was principally caused by diffusion between macropores (main path) and micropores (deadend pores) due to concentration differences.…”

Section: Kinetics Of Cls Adsorption Onto Limestonementioning

confidence: 99%

Kinetics and Equilibria of Calcium Lignosulfonate Adsorption and Desorption onto Limestone

Bai¹,

Grigg²

2005

Proceedings of SPE International Symposium on Oilfield Chemistry

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractEquilibria and kinetics are two basic ingredients for the proper understanding of adsorption and desorption processes between surfactants and rocks. The adsorption and desorption of calcium lignosulfonate (CLS), commonly used as a sacrificial agent in surfactant-based EOR processes, has been studied.Kinetic results showed that adsorption and desorption are both time-dependent, not instant. Both adsorption and desorption were characterized by a biphasic pattern: a fast step followed by a slow step. Apparent adsorption and desorption rate coefficients were determined by a second-order kinetic model. Desorption is a much slower process than adsorption. Desorption is an un-equilibrium process under normal reservoir flow rate conditions. Equilibrium results show that CLS adsorption and desorption onto limestone can be described well by the Langmuir isotherm over the tested CLS concentration range, and that increasing concentration increases adsorption density. There is significant hysteresis between CLS adsorption and desorption isotherms. Increasing flow rate slightly decreased CLS equilibrium adsorption. Increasing both NaCl and CaCl 2 concentrations increased adsorption density; however, CaCl 2 had a much greater impact on the adsorption. Increasing pH decreased CLS adsorption onto limestone. The reasons for the effects of the different factors are elucidated in this paper.

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“…However, the issues of solute transport in FPM have been studied relatively less. It should be noted that one of the pioneer works was done in [13][14][15], where an approach was taken to compile and analyze the hydrodynamic models of the solute transport in FPM. In the aforementioned works, the process of solute transport in FPM is described by a combination of convective-diffusion transport, which is dominant in fractures, and diffusion transport, which is dominant in porous blocks.…”

Section: Introductionmentioning

confidence: 99%

Solute Transport in the Element of Fractured Porous Medium with an Inhomogeneous Porous Block

et al. 2020

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In this paper, the problem of solute transport in a fractured-porous medium taking into account the non-equilibrium adsorption kinetic is studied. The solute transport in fractured-porous medium consisting of two fractures and a porous block between them located in a symmetric form is considered. The problem is then solved numerically by using the finite difference method. Based on the numerical results, the solute concentration and adsorption fields in the fractures and porous blocks are shown in graphical form. The effect of adsorption on the solute transport in a fractured-porous medium is then analyzed. In the case of different parameters in two zones, asymmetric distribution of the solute concentration and adsorption is obtained. The nonlinear kinetics of adsorption leads to an increase in the adsorption effects, conversely slowing down the rate of the distribution of concentration of the solute in the fluid.

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Adsorption II. Nonequilibrium adsorption of surfactants onto three reservoir cores from the Norwegian Continental Shelf. The effects of clay minerals

Cited by 25 publications

References 9 publications

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

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

Kinetics and Equilibria of Calcium Lignosulfonate Adsorption and Desorption onto Limestone

Solute Transport in the Element of Fractured Porous Medium with an Inhomogeneous Porous Block

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