The influence of carbon dioxide on swelling, size of particles, intensity of sedimentation, jellification time, pH value, chemical composition of sediments from suspensions is studied bentonites of two types NaM and CaM in the field of the Chechen Republic for. It is shown that carbon dioxide is well absorbed by both types of bentonites. At the same time the swelling index, pH value and sedimentation time decrease, while the size of particles and concentration of soluble salts in the dispersion medium increases. The obtained results can be used to manage colloidal properties of bentonite suspensions of the considered types and to assess the swelling index of clays in productive collectors of oil and gas industry. The ability of bentonite water suspensions to absorb carbon dioxide can be used to regulate its concentration in water and in air with biological objects.
In the process of using drilling muds in the oil and gas reservoirs, bentonite clay accumulates, which precludes their development, if not swelling it with carbon dioxide. The objection of this paper is to present the results of the sedimentation study and the degree of bentonite swelling depending on time for suspensions with different water concentrations of solid phase and carbon dioxide. If carbon dioxide gas is introduced into the dispersion medium, 0.12% of the weight, sedimentation is completed within the first 2-3 hours with a lower value of swelling degree. Precipitates obtained in samples with gas have particle sizes and chemical composition significantly different from the reference variant. It is found that in suspensions of bentonite with carbon dioxide the concentration of silicon in the sediment decreases to 10%, which is explained by its transfer to the dispersion medium in amorphous form.
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