We present in this article results of an analysis of materials of a complex of geological and geophysical studies, including a description of the core data, facies' characteristics, tectonic features of the evolution of the territory, field development geophysical data. The initial materials for the research were the drilling data and the results of seismic surveys, as well as publications of geologists and geophysicists dealing with the problem of finding ways to increase the efficiency of the development of hard-to-recover reserves of Tyumen suite. The research area is confined to the eastern slope of the Krasnoleninsky arch of Western Siberia, within which several oil fields of various sizes have been identified that are now being actively development.
Based on the work carried out on the group of layers of Tyumen suite, areas of distribution of lithofacies of fine-medium-grained and multi-grained sandstones within the forecast area of development of channels and cones of deltas and facies of channel valleys were identified, taking into account the structural factor and isopach maps. The transverse dimensions of the boundaries of the development of riverbed valleys with a very complex configuration range from 0.5 to 2.5 km. The predicted effective sandstone thicknesses of individual strata in areas with improved filtration and capacitive properties reach 12-14 m.
The analysis of the geological structure of the deposits of Tyumen suite will serve as an information basis for creating the molds of reliable geological model, based on which, with the help of digital modeling, an assessment of the prospects for further work on the object under study and the search for the necessary methods for its development will be

Low-pressure gas production is one of the most important tasks in gas field development. To estimate the reserves of previously uninvolved reservoirs with low reservoir properties, it is necessary to analyze available geological and geophysical information for the subsequent creation of a three-dimensional geological model. Based on this model, a filtration model will be built, which allow calculating the flow rates of both actually drilled and designed wells for the entire development period. The model is built on the basis of small amount of information content, but the modeling results sufficiently reflect the presence of a zone of poorly saturated part of the Cenomanian gas reservoir, and structural and petrophysical features of the reservoir in the territory. As a result of the conducted research, the low pressure gas reserves at the Yamburgskoye field were calculated. The calculations, which are given in the article, are correct and don't contradict the Regulations on the creation of permanent geological and technological models of oil and gas and oil fields (RD 153-39.0-047-00).

This article considers the problem associated with conducting experiments in computational fluid dynamics, the solution of which is the application of the equations of incompressible fluid flow and the introduction of vortex flow functions.
The aim of this work is to simulate the temperature viscous flow with a set Reynolds number inside a porous medium enclosed in the rock material to further describe the thermal front of motion in the form of a system of equations, with the choice of the most likely suitable system with differentiated equations for each segment of the thermal simulation (along the cube axes), the final cross-correlation, spread in the identified physical field of confusers/diffusers.
Scientific novelty of the performed work is due to the original approach to the development and interpretation of the results of the algorithm for predicting the temperature field in the textural configuration of the confusers/diffusers of rocks.

The algorithm of estimating the reserves of gas deposits by the material balance method is described. The advantages of this method are the use of rather precise field technological information for calculations and the possibility of regular checks for compliance with the actual nature of field development. However, there are problems of practical application of this method. One of them is the determination of average weighted pressure for the whole gas-saturated volume, especially for low permeable reservoirs with deep depression craters around wells. The process of correct determination of weighted average pressure by means of isobar map and map of effective gassaturated thicknesses of gas reservoirs is proposed and described. Another problem is the long time interval between measurements of reservoir pressure during the field development. We offer the method that allows increasing frequency of isobar mapping by interpolation of reservoir pressure values by calculating this value through the productivity of wells in order to perform operational analysis of the field development. The input data for the calculation are the dynamics of gas flow rate and wellhead pressure dynamics. This approach allows us to estimate formation pressure around each well outside the de-resistivity funnel at any time. The article presents the results of testing the proposed method under field conditions at one of the Yamal fields. The results of the analysis show the difference in the volume of drained reserves with the geological model for a low permeable layer. The difference in the reserves volume estimation by the material balance method using the isobar map was 18 % of the initial geological reserves. The analysis of the reasons of divergence of the drilled reserves was carried out and the fact of differently sorted excavation along the section and the presence of uninvolved reserves was revealed.

The article presents the results of field trials of an experimental plunger submersible pumping unit on a directional well at the Romashkino oil field. The authors compare the performance parameters (electricity consumption and torque developed by the drive during steady-state operation) of the rodless oil production technology to the use of rod pump units and traditional pumping units.
It is dealt with the inclinometric parameters of the wellbore, certain characteristics of energy consumption, as well as data on the torque developed during operation on the drive shaft of an experimental plunger submersible pumping unit obtained during field trials.
The authors of the article considered the experimental results obtained and came to the conclusion that the new rodless technology of oil production fundamentally proves its performance under operating conditions in a directional well, and the energy indicators confirm the efficiency and significantly exceed installations based on rod pumps.

The article describes a system for setting and stabilizing the radiation frequency of submersible downhole vibrators. It is assumed that submersible downhole vibrators are used for vibration wave impact on the bottomhole formation zone in wells with a depth of 50 to 300 meters, in which the bottomhole part is structurally designed to be able to convert a comprehensive (pulsating) impact into an oscillating one. In this case downhole vibrators must be subject to additional requirements for the frequency range of the radiation and the accuracy of maintaining the frequency. The speed of rotation and the frequency of the rotary hydraulic vibrator, which is installed in the bottomhole, depends on the fluid flow through the vibrator. In the operation of a submersible vibrator as a hydraulic machine, it must be taken into account that the working fluid from the pump to the vibrator is supplied through a system of oil well tubing, which is a long hydraulic line. The authors of the article compiled a block diagram of the control system, taking into account the transfer functions of the flow controller, a long hydraulic line and the vibrator. The text gives valuable information on the possibility of using flow controllers to ensure setting and stabilization of the radiation frequency of the vibrator.

In this work, magnetite crude oil-based magnetic fluids have been synthesized and studied. Their physicochemical parameters (density, viscosity, magnetic phase particle size) have been determined. IR spectroscopy and thermogravimetric analysis have been performed. The magnetocaloric properties (magnetocaloric effect and heat capacity) of magnetic fluids have been determined by the microcalorimetric method in the temperature range of 278-350 K in the magnetic field changing its value from 0 to 1.0 T. The maximum value of the magnetocaloric effect of a magnetic fluid with a magnetic phase volume concentration of 0.08 is 0.0035 K at 310 K and at the magnetic induction to 1.0 T. The obtained samples of magnetic fluids have low production costs because crude oil is used as the carrier fluid and can be recommended for various applications of the petroleum and gas industry, for example, for well killing.

The article deals with issues related to the mechanism of solidification of oils. The authors present the results of a dielectric investigation of structural-phase transitions in oils from the fields of Tyumen region in the temperature range -110 ÷ +20 °С. The dielectric relaxation of oils has been established, the values of the activation energy and dielectric relaxation time have been calculated. The phase transition determined by dielectric relaxation is interpreted as a transition from the glassy state to the associated state. The glass transition of oils, accompanied by the cessation of internal rotation in hydrocarbon molecules, is a sign of their true (or viscous) solidification. The glass transition temperature and the temperature region of the structural solidification of oils were determined. The glass transition temperature is considered to be the true pour point. The relationships between the physicochemical characteristics of oils and the parameters characterizing their dielectric properties were established, which were studied by the methods of correlation and regression analysis. The obtained regression equations can be used to predict the physico-chemical characteristics of oils in the technological processes of their extraction, field preparation and transportation.