Recent advances in cellulose and its derivatives for oilfield applications.

A comprehensive review of asphaltene deposition in petroleum reservoirs: Theory, challenges, and tips

Effects of carbon ash on rheological properties of water-based drilling fluids

TGA, rheological properties with maximum shear stress and compressive strength of cement-based grout modified with polycarboxylate polymers

Rheological measurements of Na-bentonite and sepiolite particles in the presence of tetradecyltrimethylammonium bromide, sodium tetradecyl sulfonate and Brij 30 surfactants

Removal and prevention of asphaltene deposition during oil production: A literature review

In this article, the rheological properties of bentonite suspensions at different concentrations, with and without anionic polymer additives, are investigated. The clay used is a drilling bentonite from Maghnia (west of Algeria) and the additives are sodium carboxymethylcellulose and xanthan gum. Experimental flow measurements, obtained by a controlled-stress rheometer, were used to highlight the effect of the additives on the rheological properties of the bentonite suspension. The Herschel-Bulkley and the Ostwald models were used to fit the rheograms. It has been shown that the presence of carboxymethylcellulose in the bentonite suspension has helped to remove the yield stress and to increase the viscosity of the mixture. On the other hand, the xanthan induced an increase in the yield stress and a high increase in viscosity of the bentonite-polymer mixtures.

The Effect of Carboxymethylcellulose and Xanthan on the Rheology of Bentonite Suspensions

Cement-based grouts have been used successfully to repair cracks in many concrete structures, to ensure the stability of slopes or retaining walls and to reinforce soils or rock foundations. This s...

https://www.tandfonline.com/doi/pdf/10.1080/23311916.2018.1446252

Study of the impact of bentonite on the physico-mechanical and flow properties of cement grout

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Effect of Bentonite on the Rheological Behavior of Cement Grout in Presence of Superplasticizer

The rheological parameters, yield stress, flow index, consistency, and plastic viscosity of cement grouts are important parameters for the quality control of these materials. These parameters are assessed from the rheogram using a rheological model. Cement slurries without additive indicated a non-Newtonian type of rheological behaviour with yield stress. On the other hand, the mixtures containing a viscosifying agent exhibit a shear-thinning rheological behaviour which is much more important than the mixtures without a viscosifying agent. In this work, we formulated non-hydrated Algerian bentonite cement slurry in the presence of a superplasticizer. Cement was replaced cement by bentonite in five different substitution rates (2%, 4%, 6%, 8%, and 10%) and the water/binder ratio was fixed at 0.5. For this, various rheological tests were realized by using a controlled stress rheometer. In order to show the influence of bentonite on the rheological behaviour of the different grouts, several flow tests were carried out for a range of shear rates between 0.01 and 200 s−1. To properly adjust the different rheograms, various rheological models were used such as the models of Bingham, Herschel–Bulkley, modified Bingham, Casson, De Kee, Vom Berg, Yahia and Papanastasiou. For the correct choice of the rheological model, it was based on the calculation of the standard error. It was found that the rheological models of Herschel–Bulkley and Papanastasiou made it possible to better describe the flow curves compared to the other rheological models. It has been found that as the content of bentonite increases, the yield stress and the consistency evolve drastically, by cons the flow index decreases progressively.

/pdf/rheological-behavior-of-cement-based-grout-with-algerian-3zpoamzn4p.pdf

Khaled Benyounes

Papers

Removal and prevention of asphaltene deposition during oil production: A literature review

The Effect of Carboxymethylcellulose and Xanthan on the Rheology of Bentonite Suspensions

Study of the impact of bentonite on the physico-mechanical and flow properties of cement grout

Effect of Bentonite on the Rheological Behavior of Cement Grout in Presence of Superplasticizer

Rheological behavior of cement-based grout with Algerian bentonite