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Link for citation: Lambin A.I., Averkina E.V., Erygina A.N., Averkin N.A. Evaluation of the possibility of using spent turbine oil as a lubricating additive in drilling mud. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 10, рр. 169-178. In Rus. The relevance. The consumption of lubricants and, as a result, the volume of used oils increases annually. As a result, large volumes of them are accumulated, which require standard methods of handling them. It is known that oils, including waste ones, are used as lubricating additives to drilling mud. The practice of recent years has shown the expediency of replacing lubricating additives with used lubricating oils, which would ensure the preservation of the main and the achievement of new properties. This article presents the results of a study of micelle-forming solutions under the influence of Na and K salts on their filtration and crust-forming properties. The main aim: evaluation of the possibility of using spent turbine oil in the drilling mud as a component of a lubricating additive, as well as its effect on the main parameters of the drilling mud; study of the effect of oil, ether and salt interaction on the filtration and crust-forming properties of drilling mud. Objects: spent turbine engine oils selected at the drilling site during the construction of the well. Methods. Drilling mud indicators were measured. Water, technical oil and ether were used to form micelles. The studies were carried out using the methodology of a complete factor experiment, in which the studied effects of salt in solutions were approximated in the form of first-order polynomials. Results. By comparing the first coefficients of the polynomial models, a significant effect of sodium chloride on the rheological and filtration properties of solutions and the stickiness of their filtration films was revealed. The effect of chlorides on a group of eight solutions in different oil fractions was statistically confirmed, for which the Student and Mann–Whitney criteria were used. The paper introduces the graphical interpretation of some approximations of the equations of the effect the solution ingredients interaction on the response value.

Link for citation: Lambin A.I., Averkina E.V. Study of the variability of rheological properties of water-based biopolymer dispersions in drilling fluids. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 8, рр. 91-97. In Rus. The relevance. Water-based biopolymer drilling fluids have become quite widespread in the technology of oil and gas well construction. Much attention is paid to the methods of regulating the physical and mechanical properties of biopolymer systems. In particular, rheological properties of solutions based on xanthan gum are of great practical interest. The effectiveness of the use of polymers is determined by the amount of the main reagent and modifying additives necessary to impart the required properties to the washing liquid. Biopolymer water drilling fluids based on xanthan gum have shown their effectiveness in many regions of the Russian Federation. However, the evaluation of the effectiveness of the solutions is difficult due to the differences in the saleable products of the producing companies in solubility, swelling and composition, which affects the optimized performance of the drilling mud. The main aim: consideration of the differences in aqueous solutions of a number of samples of xanthan gum in terms of power dependence: K-coefficient of consistency and n-degree of deviation from the Newtonian flow regime of the study. Objects: rheology of aqueous solutions of several xanthan samples, both purely aqueous and based on aqueous brines of potassium chloride (KCl) and sodium (NaCl). Methods: instrumental methods for determining the parameters of drilling fluids according to SS 33213-2014; the difference in the parameters of the power rheological dependence was determined by comparing its indicators after measuring the viscosity of solutions on a viscometer with direct indications. Results. The influence of a fixed concentration of NaCl and KCl salts on the considered indicators of the power model is shown. A generalized optimization indicator is proposed for solutions obeying a power-law rheological law. The calculated dependence of the accuracy of approximation of experimental data by a power model, which showed acceptable accuracy, is presented.

The relevance. The widespread use of biopolymers in the composition of drilling fluids makes it possible to upgrade the latter in terms of improving the hydraulics of the circulation system, increasing the outflow capacity of the flushing fluid, solving issues of stability of the walls of an open borehole. Interest in the use of vegetable gums in drilling is increasing. The main aim of the article is to determine the distinctive properties of aqueous polymer solutions in geological terms. The rheological properties of the drilling mud are an important factor in the productivity of the well deepening process. Thanks to the rheological curve of the drilling mud, we can more accurately estimate the equivalent circulation density and the ability to remove fracture products from the well, optimize hydraulic parameters, etc. Objects: rheological properties of aqueous solutions of biopolymers, in particular, xanthan gum, which manufacturing companies supply in powder form. Methods: instrumental methods for determining rheological parameters of aqueous solutions of biopolymers according to GOST 33696 (ISO 10416), estimation and analysis of the dispersion distribution with three measurements at each point of the experiment. Results. The authors carried out the statistical study of the differences in the shear stress readings of aqueous solutions of the powders under study. Due to the non-compliance of the measured voltage values with the normal distribution, the nonparametric Mann–Whitney comparison criterion was used, the calculations of which for two possible combinations of small samples showed no differences. The susceptibility of rheological parameters of aqueous solutions of xanthan powders to pseudoplastic values of the Oswald de Weil power model is shown.