Influence of nonionic polymers on the rheological and electrical properties of Egyptian bentonite

The influence of poly (vinyl) pyrrolidone (PVP) adsorption on the zeta potential and water loss of raw Saudi bentonite (B) and Na-rich Saudi bentonite (Na-B) suspensions was investigated. Phase analysis of raw Saudi bentonite was characterized by XRD, and chemical analysis was investigated by XRF. Adsorption study was performed by patch technique. The zeta potential and water loss of B and Na-B suspensions were measured at different PVP concentrations. PVP adsorption on B was fitted by Freundlich model. For Na-B, the adsorption isotherm closely fitted the Langmuir model and showed a higher affinity and greater adsorbed amount of PVP than B. Before addition of PVP the zeta potentials of B and Na-B suspensions were −30 and −41 mV, respectively. In presence of PVP the zeta potential of raw bentonite suspension decreased, then increased with increasing PVP concentration; the reverse trend was observed in the case of Na-B suspension. The presence of PVP greatly influenced the water loss of B dispersion but had a slight effect in the case of Na-B.

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“…As a result, the zeta potential of Na‐B suspension increased at low adsorbed amount of PVP. The present results coincide with other studies 20–21…”

Section: Resultssupporting

confidence: 94%

Effect of poly(vinyl)pyrrolidone on the zeta potential and water loss of raw and Na‐rich Saudi bentonite

Juhaiman

Mekhamer

Al-Boajan

2010

Surface & Interface Analysis

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“…Due to the long chains of HEC, the formation of interparticle bridging is carried out when this polymer is adsorbed onto the clay particle surface, it also favours the interactions particle-particle, and consequently, the HEC forms like a network structure together with bounded water molecules to it and adsorbed clay minerals, which increase the elastic and the loss moduli. In addition, the electrostatic repulsive and the van der Waals forces, which bring particles to an equilibrium state, yield to gel formation [42]. Güngör and Ece have obtained similar results on the polymer poly (vinyl) pyrolidine.…”

Section: Effect Of Hec On the Shear Complex Modulus Of Bentonite Suspmentioning

confidence: 83%

Hydroxyethyl cellulose as a rheology modifier for water-based drilling fluids formulated with Algerian bentonite

Ouaer

Gareche

2019

J Braz. Soc. Mech. Sci. Eng.

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Under the different geological conditions of wells and during the drilling operation, some of the water-based drilling fluid compositions are sometimes not efficient for the drilling success of the oil and gas wells (case of the Algerian oil and gas wells). In the use of bentonite in drilling fluid applications, the addition of hydroxyethyl cellulose (HEC) is recommended to obtain good rheological properties of the fluid. In this research, we investigate the rheological behaviour in steady state, and dynamic shear rheology of drilling fluids formulated based on an Algerian bentonite with a fixed concentration of 3 wt% and a water-soluble polymer HEC of high molecular weight (~ 9.5 × 10 5 g/mol) at different concentrations ranged from 0.02 to 0.2%. All the results obtained by a controlled stress rheometer have been commented by taking the interaction between the clay and the polymer molecules into consideration, to highlight the effect of HEC on the rheological properties of bentonite suspensions. Herschel-Bulkley (H-B) model was used to fit and interpret the experimental data. A significant increase in the rheological properties of the mixture bentonite-HEC with the increase in HEC concentration has been shown. These properties reached the maximum at HEC concentration of 0.1 wt%; beyond this value, they decreased. X-ray diffraction test performed on the different samples also allowed understanding the rheological behaviour of the system bentonite-HEC. Indeed, the HEC could intercalate the bentonite interlayer and formed link bridges between bentonite particles below a critical concentration of 0.1 wt%. Based on the results of the study, it is recommended to choose the optimum concentration of HEC to be added to the bentonite suspension to ensure the optimum rheological characteristics of the drilling fluids. Keywords Water-based mud • HEC • Algerian bentonite • Rheological properties • X-ray diffraction List of symbols Roman symbols G′ Storage modulus (Pa) G″ Loss modulus (Pa) G 0 Elastic modulus (Pa) k Consistency index (Pa s n) n Flow index w Pulsation (rad/s) Greek symbols α Time constant (s) Shear rate (s −1) λ X-ray wavelength (Å) 2θ Scattering angle Viscosity of the polymer solution (Pa s) 0 Zero shear rate viscosity (Pa s) ∞ Infinite shear rate viscosity (Pa s) τ Shear stress (Pa) τ c Yield stress (Pa)

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“…[12] Bentonite is also modified with PEG for application as reactive clays inhibitor additive in water-based drilling fluids. [13] A number of studies related to the influence of PEG on the rheological behavior [5,[14][15][16][17][18] and electrokinetic property [5,15,16] of bentonite have also been published. Preparation of organobentonite using nonionic surfactants and d001 spacing of organobentonite were also mentioned by Yun-Hwei Shen.…”

Section: Introductionmentioning

confidence: 99%

The influence of technological conditions and molecular weight of PEG on basal spacing of Vietnamese bentonite

Thuy,

Duc

2022

Vietnam Journal of Chemistry

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The unique expansion properties of the interlayer space of montmorillonites allow for surface modification of bentonite. PEG is a nonionic polymer that can adsorb and intercalate into the interlayers of bentonite. The results of FTIR and TGA spectra allow confirming that PEG has not only covered bentonite but also inserted into the interlayers of bentonite. Therefore, the modified product can be applied not only as a dispersant in polymer composites, but also as an adsorbent. Moreover, a variety of technological factors affecting modification have been studied and the most suitable conditions have been proposed. In which, temperature, stirring speed, time and suspension concentration were selected at 25°C, 800 rpm, 8 h and 2 wt.%, respectively. The influence of the component ratio (Ben/PEG) on the modification process was also studied. The most suitable Ben/PEG ratio for each PEG type was also given. The results show that the interlayer spacing in modified bentonite depends not only on the technological conditions, the composition ratio but also on the molecular weight of PEG. Thus, the choice of PEG for bentonite modification will determine the d001 basal spacing of modified product.

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Influence of nonionic polymers on the rheological and electrical properties of Egyptian bentonite

Cited by 7 publications

References 18 publications

Effect of poly(vinyl)pyrrolidone on the zeta potential and water loss of raw and Na‐rich Saudi bentonite

Effect of poly(vinyl)pyrrolidone on the zeta potential and water loss of raw and Na‐rich Saudi bentonite

Hydroxyethyl cellulose as a rheology modifier for water-based drilling fluids formulated with Algerian bentonite

The influence of technological conditions and molecular weight of PEG on basal spacing of Vietnamese bentonite

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