The object of our research is hydrogeochemical conditions of the Mesozoic hydrogeological basin within Yamalo-Nenets oil and gas bearing region. The Mesozoic basin includes the Aptian-Albian-Cenomanian, Neocomian and Jurassic hydrogeological complexes. These complexes contain thermal and mineralized water. The water exchange in the basin in question is significantly hampered; this is reflected in hydrogeochemical conditions. The article presents the distribution maps of water types in three complexes of the Mesozoic basin, maps of changes in the magnitude of mineralization and the content of the most valuable microcomponents (iodine and bromine). It has been established that with the depth (from the Aptian-Albian-Cenomanian to the Jurassic complex) the area of distribution of sodium bicarbonate-type water increases. Further directions of groundwater research in the region are noted.  

The article analyzes features of the geological structure of Tyumen suite (J2 layer of the Imilorskoye oil field) based on detailed analysis of 3D seismic data, including maps of spectral decomposition, attribute analysis, and behavior of the wave pattern. A joint analysis of morphology presented maps can be as a basis for paleosedimentation reconstruction and prediction for distribution zones of effective bed thickness.  

The article is devoted to the determination of the critical water saturation ratio productive reservoirs. It is necessary to have information about these coefficients in order to interpret the geophysical research wells at the stage of exploration. The print media publish Burdine formulas, which contain definite integrals, to determine the coefficients that need to be solved. In this case, the upper and lower limits of the integrals in the works of different authors don't completely coincide. The author of this article analyses Burdine formulas, which have been published in various print media, and proposes Burdine formulas without integrals. As a result, it is established that Burdine formulas, which are presented in the work [6], are suitable for real conditions; but there should be taken into account the conditions under which the relative phase permeability of oil and water is equal to 0 and 1.  

The article describes features of magnetotelluric scanning of the Earth's crust while searching and exploring hydrocarbon deposits. The text gives valuable information on possibilities of magnetotelluric method in the study of the Earth's crust.  

This article is devoted to the probability maps have been constructed for predicting the zones of residual oil reserves using the example of deposits in Shaim region. The refinement of the previously presented algorithm [4] has been made, which helps with a fairly high degree of probability to quickly localize the residual oil reserves based on 2D modeling. In the process of work, the influence of many geological and technological parameters on the final probability map was established, the influence of the observation zone on the value of the correlation coefficient of the map of residual mobile oil reserves with the map of current mobile oil reserves based on geological and hydrodynamic modeling was established.

The article is devoted to the issue of well cementing in the interval of frozen rocks and factors affecting the quality of cementing. Attention is drawn to fundamental requirements for the technological properties of cement slurry and stone for low-temperature wells.  

The creation of a sealed support, providing reliable isolation of layers from each other, is one of the most important tasks in the construction of oil and gas wells. The article presents the most common in recent years in our country and abroad special technological and technical measures used to improve the quality of isolation of oil and gas reservoirs at the stage of cementing and waiting on cement with different gradients of reservoir pressures.  Attention is drawn to technical and technological solutions for preventing admission of formation fluids in the annular space of the well during cementing and waiting on cement. The solution to this problem is based on creating the design pressure at the wellhead in the annulus at a rate proportional to the rate of reduction of the hydrostatic pressure column of cement slurry (drilling mud) due to the structure hardening cement slurry.

The article describes the technology for creating a mobile viscoelastic waterproof screen in the well that uncovers an oilwater reservoir. There are three stages with the following ratio of components, mass. %, based on the completion at the boundary of the oilwater contact. The first portion of the composition is 1 % (wt.) uniflock solution + 5 % (wt.) CuSO4. Then the second portion of the composition is pumped in the following ratio of components, mass. %: 1 % (wt.) uniflock solution + 10 % (wt.) CuSO4 + ETS-32 (volume ratio ETS-32:CuSO4 = 0,33:0,17). At the final stage is the injection of the third portion of the composition in the following ratio of components, mass. %: 2 % (wt.) uniflock solution + 10 % (wt.) CuSO4 + ETS-32 (volume ratio ETS-32:CuSO4 = 0,33:0,17).  

The article presents the sequence and results of experimental modeling of artificial oil-water emulsions based on anhydrous oil and water with density and mineralization as close as possible to the real field conditions of the researched deposits. The practical importance of simulation of artificial emulsions was due to the need to work with emulsions of different degrees of water cut, which is possible only by laboratory simulation conditions. We prepared artificial oil-water emulsion using a turbine mixer in a thermostated container. Then we set the emulsion preparation mode: number of revolutions (n1, min –1) and mixing time (t, min). We selected the optimal parameters to create stable artificial oil-water emulsions according to different types of oils.  

A large number of gas and gas condensate fields are located in the West Siberian mega-province and, to increase gas and gas condensate production levels, deposits located on the Yamal Peninsula should be introduced into development. Deposits of the Yamal Peninsula are complex-built deposits, Neocomian and Jurassic deposits have abnormally high reservoir pressure with a reservoir temperature of more than 100 ° C.  The Bovanenkovo oil and gas condensate field is the largest in terms of gas reserves in the Yamal Peninsula; on this example, in this article we will study the issues of restoring the reservoir properties of reservoir rocks and increasing the flow of hydrocarbons.  To select the optimal technology and composition for conducting water shutoff treatment, it is necessary to take into account the following factors: which reservoirs represent the reservoir, the percentage of water cut in the recoverable reserves, the tightness of the production string, the current flow rate of the well during operation at constant reservoir pressure, because each field needs an individual approach with a choice suitable water shuto-ff treatment technology.  

Oil production and use have become a priority element in ensuring the existence of human society and one of the main areas of research. Despite the abundance of publications on this topic, there is a gap in the development. Available publications don't contain information about the possibility of obtaining associated goods, which could reduce production costs. The aim of the study is to fill the gap by searching for technology that provides the opportunity to obtain associated marketable products in the form of metals.  The research methodology used to achieve the goal combines the methods of systematizing and analyzing the available data on oil production technology and metal leaching technology with an integrated technology assessment at the expert assessment level.  The results of the study include a proposal for the extraction of metals from oil-bearing rocks by leaching methods. The essence and mechanism of a fundamentally new technology for mining reserves of oil fields by leaching metals from ores during the integration of underground processes of oil pyrolysis and leaching of metals from oil-bearing rocks, combining the possibilities of mine-borehole development and physicochemical leaching processes, are described. The advantages of the new technology are formulated. The obtained results provide an answer to the objectives of the study and indicate the achievement of the goal.  

The article presents the results of numerical simulation of the generation of free fire vortices in the laboratory without the use of special twisting devices. A. Yu. Varaksin, the corresponding member of the Russian Academy of Sciences, in his experimental studies has described the principal possibility of physical modeling of the occurrence of concentrated fire vortices.  In the model of a compressible continuous medium for the complete system of Navier — Stokes equations, an initial-boundary value problem has been proposed that describes complex three-dimensional unsteady flows of a viscous compressible heat-conducting gas in ascending swirling heat flows. We has constructed approximate solutions of the complete Navier — Stokes system of equations and has determined velocity characteristics of threedimensional unsteady gas flows initiated by local heating of the underlying surface by nineteen heat sources, using explicit difference schemes and the proposed initial-boundary conditions.  

Main gas and oil pipelines are the most important objects of the fuel and energy complex of the state. They are subjected to strict requirements for reliable and safe operation. Therefore, it is necessary to assess their strength (current strength) and durability (prediction strength) when operating main pipelines.  The wall of the pipes of the existing main pipelines is subjected to various loads and influences. To prevent pipeline failure, strength and durability calculations are performed. The parameters of the load and mechanical resistance of the pipes are taken into account when calculating. Therefore, the "load — resistance" model is used to quantify the reliability of the main pipeline. This paper presents the main theoretical provisions of the methodology for assessing the strength and durability of trunk pipelines with single and combined defects in the framework of a combined probabilistic-statistical approach, and also an example of the use of the technique for a section of a trunk pipeline examined by an inline flaw detector.

There are polycondensation ester depressant additives, obtained by the condensation of polyhydric alcohols, synthetic fatty acids and dicarboxylic acids. The effectiveness of such additives is limited to oils and petroleum products containing high melting solid hydrocarbons. Such additives are not effective in diesel fuels. Therefore, it was of interest to synthesize condensation ester depressor additives with a different combination of starting materials. We used pyromellitic dianhydride (it is a product derived from polyhydric acid) as a base, also higher fatty alcohols as substances that add additives to the surface-active properties and solubility in oils and petroleum products, and glycols, for example ethylene glycol, as substances that regulate the molecular weight of additives.  Depressor additives were synthesized by condensation of higher fatty alcohols fractions C10 – C20 and pyromellitic dianhydride with the subsequent introduction of ethylene glycol into the structure of additives.  We evaluated the depressor properties of the additives when they were introduced into the diesel component of the Surgut condensate stabilization plant. Additives were considered all the more effective, the higher the depression of the pour point of the oil in their presence and the lower their consumption.  We introduced into the diesel component of the Surgut condensate stabilization plant, and then evaluated their properties. The higher the depression of the pour point of the oil when using depressor additives and the lower their consumption, the additives were considered more effective.  Taking into account the simplicity of the technology, waste-free production and sufficiently high efficiency, we can recommend the depressor additives synthesized in the study to reduce the solidification temperature of diesel fuels.  

The article considers the developed and implemented in the cutting process methodology for managing the dynamic strength of the cutting parts with the tops of tools from STM simultaneously on the front and back surfaces of these tools at thin turning of heatresistant alloys on CNC machines. The specified methodology is based on optimizing (physical, thermal) models of process of thin turning of heatresistant alloys tools from STM developed by us and the offered concept of passing of process of interaction of the processed and tool materials in the conditions of optimization of contact voltage and temperatures at the same time on the front and back surfaces of the tool from STM when cutting.

The use of Chebyshev's polynomials of the first type to the strength of materials is based on probabilistic logic for the objective states of a metal. This is the case when "pure" science helps practical issues of objective reality. Due to this, it was noted that the metal undergoes a stable and unstable state during loading. The use of Chebyshev's polynomials of the first type has showed that the most stable state of the metal is shown by the Т9curve, at which the ratio б/б_т  = 0,5. This ratio is most favorable for pressure vessels, in contrast to the recommended American standard ASME, in which б/б_т  = 0,666 (this ratio reduces the reliability). Assessment of the state of the metal taking into account the frequency characteristics is more promising. This assessment confirms the frequency ratio б/б_т  ≈ 0,5 and allows taking into account inelastic phenomena in the metal, taking into account the loss coefficient, as well as to assess the possibility of resonance. The application of the control valve using the patent RU 2416751C1 allows achieving the optimal frequency of gas oscillations in the pipe and reducing the probability of resonance.

The article discusses the unsteady drainage as one of the ways to increase oil recovery. With this well operation process, optimal periods of pump switching are determined to increase the oil flow rate and reduce the watercut. The object of study is the "reservoir — well — pump" system. The purpose of the study is to ensure efficient operation of wells. We use the descriptive method, including the analysis of transient processes of the "reservoir — well — pump" system on a simulation bench, interpretation of transient graphs, and comparison and generalization of the results. The research results showed the dependence of the pressure change on the pump operation mode, i.e. the dependence of the formation parameter on the change in the flow resistance of the "reservoir — well — pump" system. For each transient process, the optimal period of pump operation was determined equal to 3 τ, which will ensure efficient well production mode.  

Improving the low-temperature properties of oil fractions, in particular diesel fuels using depressant additives, is one of the simplest and most effective methods. The synthesis of additives based on the use of domestic industrial raw materials. The article presents the data on the development of polyamide depressant additives; we used pyromellitic dianhydride (it is a product derived from polyhydric acid) as a base.  

A new low-temperature environmentally safe method of efficient processing of municipal solid waste of organic origin by coking has been developed, which can be used in the future for processing any types of organic waste. In addition, recommendations on the use of processed products were provided.