Tyumen 2021

The purpose of this work was to investigate the effect of a thickening polymer additive - polyisobutylene - on tribological properties of polyurea greases. Biocoal in concentration of 5,10,15 mas. % was added to the obtained lubricant samples. The following were analyzed: dropping point (GOST 32394-2013), penetration (GOST 32331-2013), colloid stability (GOST 7142-74) and tribological characteristics (GOST 9490-75). Based on the analysis of the data obtained, it was concluded that the diameter of the wear spot decreases and the dripping temperature increases with increasing concentration of the filler, which affects the effectiveness of its work in the grease. To improve the studied parameters it was suggested to add to dispersion medium a thickening additive - polyisobutylene (PIB) of different molecular weight -10 thousand g/mol, 30 thousand g/mol and 50 thousand g/mol (1%). As a result of the work performed, we concluded that the best tribological properties are the samples in which an PIB additive of 10 (1%) was dissolved in oil.

Saline frozen soils occupy vast territories of the Arctic coast. , it is necessary to determine the state of frozen soil for construction purposes. Because there are saline soils with a negative temperature, which is higher than freezing point. These soils do not contain ice and have high deformability, low bearing capacity; therefore, they must be identified at the preliminary stage of site investigation. We carried out special laboratory test, where determined different characreristics for calculation (salinity, water content, density, Atterberg Limits, freezing point, velocity of longitudinal waves, electrical resistivity). A method for calculating the concentration of pore solution in soils ( massive cryogenic texture) based on the data of geophysical parameters (velocity of longitudinal waves, electrical resistivity) has been proposed and tested. Using of the obtained value of the concentration of the pore solution makes it possible to calculate freezing point according to the formula recommended by Russian standard SP25.13330.2012. Calculations carried out using the data of electrical resistivity are closer to the experimental values. Thus, knowing freezing point and temperature of soil (according to themperature measurement, which are carried out everywhere in permafrost), it is possible to determine state of frozen soil.

The model of the formation of the Cheuska and Sarman cyclites as a part of a regional-cross-bedding model of the structure of shallow-marine sediments of the Berrias-Valanginian period is presented. The facies zonation of the deposits is shown, due to the cyclical change of sedimentation conditions, the influence of local features of the paleorelief, the formation of areas of secondary re-deposition as a result of the influence of high energy water-flow.

Tomography of potential fields is considered in this paper. Calculations is carried out by downward continuation of potential fields. A serious drawback of tomography is oblique (at 45°) interference from intensive field anomalies on computed spatial distribution of effective magnetization or density. It is necessary to continue down components extracted from the field with iterative or median bandpass filter in this work. These interferences will suppressed and shown in model and practical example.

One of the main problems for oil & gas industry in the Udmurt Republic is a high content of water producing along with oil, caused by involving many fields of the region into the final stage of development. Effective performance of repair & insulation works, also known as remedial well servicing, allows slowing down the tendency of increasing the excess water coproduction from producing wells. However, when designing repair & insulation work technology, the correct determination of the water cut source based on the research results plays a key role. This article considers the chief causes for the early water cut increase in wells and forms their classification. Taking oil fields located in the Udmurt Republic as examples, the main ways of water inflow to the bottom of production wells are examined. Comprehensive analysis shows the efficiency of repair & insulation works at the fields in question.

The use of oil-based mud (OBM) in exploration and production drilling has a number of significant advantages. High stability of characteristics over a wide range of temperatures and pressures allows drilling in complicated mining and geological conditions. However, the high affinity of OBM with reservoir hydrocarbons interferes with laboratory studies of core material and fluid samples. Incorrect interpretation of research results leads to incorrect determination of oil saturation intervals, type of fluid, organic matter transformation degree, etc. The report presents some possibilities of geochemical methods for minimizing the influence of technogenic OBM components on the analysis results.

The work presents an alternative methods to predict the surface basement that provide a detailed overview of prediction using the algorithms “Random Forest (RF)”, “Gaussian process regression (GPR)” and “Regression tree (RT)” based on regression problems applicated on potential fields. To assess the error of these methods when determining the depths of the basement, part of the data in the training grid of different sizes and areas were excluded.

This article considers the issue of identifying the generation-accumulation hydrocarbon systems of the Eastern Ciscaucasia. Taking into account the available and pre-processed geological and geophysical material, two-dimensional basin modeling was carried out in the PetroMod software package (Schlumberger). The target object of modeling are the Oligocene sediments in the volume of the Khadum and Batalpashin formations.

Proven reserves of «traditional» oil are on a declining trend. Therefore, it is necessary for producing companies to consider hard-to-recover reserves as a resource base in the future. Currently, the term «hard-to-recover reserves» is not defined enough. Some categories of the hard-to-recover reserves may be deleted from this list due to the development of technology, making the production of hydrocarbons much easier. However, an exploration of subsurface using modern technology makes it possible to produce these hydrocarbon reserves. That was impossible previously. The examples are the production of Permian petroleum bitumen and the development of domanic formations.

An important feature of the Bazhenov Formation is the heterogeneity of its lithological composition along the section. This article presents the results for one of the wells from the Druzhnaya area, located on the northern slope of the Khantheyskaya hemianteclise in the central part of the Khanty-Mansi Autonomous Okrug. For each lithological type of rocks, core-GIS dependencies were found that best describe its distribution over the section. The organic matter content correlates best with the radioactive log values. The concentrations of siliceous material and pyrite have a pronounced relationship with the electrical resistivity of rocks. The concentration of carbonate material correlates with the values of neutron logs, and the content of clay matter - with the density of the rocks and their electrical resistivity. After that, the multidimensional dependences of the content of each component on several types of logging were analyzed, which served as the basis for calculating the curves of their content in the rock. The calculated curves correlate well with the core data, which is confirmed by the high values of the reliable approximation (R2), which varies from 0.72 to 0.89 for different components. The resulting volumetric model clearly shows the relative content of the main rock-forming components in the Bazhenov Formation and their distribution over the section. The obtained dependences can be used to calculate the lithological composition of the Bazhenov formation in closely spaced wells that are not characterized by core material.