The qualitative and quantitative assessment of ground waters protectability based on the regional specific charac-teristics of the lithology and thickness of impermeable deposits of the zone of aeration and overlying deposits, a ratio of confined and ground water levels, the soils and clay rocks absorptivity. The article gives the author's vision of ground waters natural protectability. It presents a quantitative estimation by three most well-known methods. Based on the calculations made a map of protectability of fresh ground waters in the Atlym-Novomikhailovsk complex for Nizhnevartovsk district was constructed.

A new model of hard-to-recover oil reserves generation in the dome part of the structure is described. It is shown that in the dome part of the structure thin pore canals are saturated with oil thanks to high overpressure, while in the transition and undersaturated zones the same size canals are filled with water. When producing oil by contour water-flooding the water effectively displaces the oil from large pore canals, but fine pores remain oil-saturated. It is shown that to recover oil from thin pore canals some new methods of the formation stimulation should be developed.

The article presents lithology-capacity models of the productive reservoirs of the Tournaisian stage Kremenkul-skoye oil field in Orenburg region. It focuses on the rocks composing the strata of the horizon, these strata reservoirs types, based on the data of which the lithology-capacity models were constructed for further interpretation of different types of data.

The data are presented showing that in the Achimov section deposits in the northern areas of West Siberia along with the porous type of reservoirs there occurred fractured-porous and porous-fractured types. The basic factors of fractures generation, the types of fracturing and the influence of fracturing on wells productivity are reviewed.

In the article a review of the textbook «General Hydrogeology» by the prominent research hydrogeologist Shvartsev S.L. is presented. This textbook was published in 2012. The textbook can be considered an the achievement of the world hydrogeology in the beginning of the XXI century. The analysis of the textbook abstract theorems is accompa-nied by the author's reflections about the state of the hydrosphere in present time conditions.

The world experience of tomography and micro-tomography methods application in petroleum geology was de-scribed in the article. The examples of determining the mineral composition of rock based on the visual analysis are described. The 3D model of the pore space with segmentation inside the pore fluids was constructed. The attempt is described to correlate the data of average equivalent-diameters with permeability, and a number of conclusions about the universality of application of the computer micro-tomography method in geology based on visual analysis of rocks tomograms are made. Some findings about isotropy / anisotropy of physico-mechanical and filtration properties are presented. The promising areas of application of the method in the petroleum geology sphere are highlighted.

In the article some issues of application of pilotless flying vehicles in oil and gas industry are reviewed. It is shown that such vehicles flight can be optimized by using the pulse technique and radiolocation.

The paper presents the results of the study of the structure and depositional environments formation in the lower Miocene reservoirs in the Central area of Dragon field (Cuu Long basin, Vietnam offshore) based on litho-facial, electro-facial, seismic-facial analyses, and biostratigraphy data and the deposits thickness analysis. The geological model refining had been done through the core analysis, seismic interpretation, wireline logs integration and via defi-nition of the depositional environments. The results received permit to predict the depositional environments distribu-tion in the areas that were not identified by drilling, to make more exact the area oil reserves evaluation, to enhance the oil recovery.

The subject of the study presented is a process of acid treatment of a fracture generated by FHF using proppant in carbonate reservoirs. For prediction of acidizing treatment effectiveness the averaged mathematical model of this process was developed based on the laws of acid mass conservation and acid transport in fractures taking into account the acid solution leakage due to diffusion towards the treated surface. The modeling aids in the pressure field predic-tion, as well as the acid concentration profile along the fracture and the fracture width variation resulted from the face etching, and the skin factor as a function of injected acid amount and injection rate.

The article presents the generalized experience of marginal oil wells completion. A technology was developed which allows maintaining the stability of the drilled borehole walls stability at the expense of capillary imbibition of the productive stratum with the injected special composition developed by the authors based on the professor Ya-gafarov’s study results.

The paper presents the analysis of results of the rocks stability study for some oil fields of Surgut dome. The study enabled to identify the intervals of the most problematic areas and to define the tasks the achievement of which will permit to improve the effectiveness of such areas drilling in.

Hydrodynamic studies in gas-condensate wells allow determining the features of fluids flow in the gas condensate reservoir by build-up curves. A variation in the shape of the build-up curve may reflect a behavior of fluids in the reservoir, that is the nature of the fluids motion in porous media. The possibility of identification of characteristics of the combined liquid and gas filtration zone by build-up curves, as well as the radius of the zone of gas-condensate blockage is shown. Based on the examples of the log-log build-up graph in Venezuelan and Russian fields the exis-tence of the characteristic shape part on the build-up curves was demonstrated, evidencing the retrograde processes occurring in the reservoir.

The paper reviews the new technologies developed for rehabilitation of wells being out of operating for a long time. It presents a complex of works needed for such wells brining back into operation

A solution is provided for enhancing the efficiency of using the developed formations energy within one cluster of wells having different reservoir pressures which implies a calculation and further application of gas ejector. The method offered enables not only to improve the performance of low pressure wells, but also helps to extend the life of wells being out of operating because of low wellhead pressure.

The methods are considered for recovery of selfsqueezing gas wells. The necessity of applying the solid surfac-tants is proved. On the example of the field Medvezhie a method is proposed for determination of the required amount of solid surfactants for prevention of gas wells selfsqueezing.

Geotechnical monitoring results analysis of gas main pipeline’s lineal part accomplished based on JSC «Gaz-prom» data of 2011-2013 yr. Line damages classification and its evolution dynamic assessment are made taking into account reconstruction operations of sections with non-normative condition. Definition is made about geotechnical monitoring main deficiency, which is lowering the quality of produced data about object condition. It is offering to solve the row of science-technical problems for efficiency increase of geotechnical monitoring results proceeding methodic.

To investigate the convective flows of polytropic gas a complete system of Navier - Stokes equations is consid-ered. As the initial and boundary conditions the specific ratios are offered. The proposed initial and boundary condi-tions realization is carried out at construction of the numerical solution of the complete system of Navier - Stokes equations for modeling the unsteady state three-dimensional convection flows of the compressible viscous heat-conducting gas in the isolated cubic area. Three components of the velocity vector are calculated for the initial stage of the convective flow. It is shown that the velocity components are complex and depend essentially on the heating shape, height and time.

The model of gas diffusion combustion developed by Zeldovich Ya.B., despite of the fairly satisfactory agree-ment of the obtained data with the experiment shows a non-universality and a large volume of the algorithm for de-termining the concentrations of the components when a number of active components and their composition change. In this regard, it became necessary to develop a different, simple modification of Zeldovich’s model, which would lead to the least number of operations for determination of the gas temperature and density at known values of rela-tively excess concentration and total enthalpy.

The experimental investigations of steel samples under the influence of the bending load were conducted. It is demonstrated that in the event of the steel stress-strain state occurrence, its natural electric potential changes. The obtained dependence enables to determine mechanical stresses in a body of the object under study based on the electrical measurements data.

A problem of improvement of precision of engineering products NC working is considered. A solution is offered to solve this problem through ensuring the introducing the on-line corrections into the machines actuators path motion. The necessity is proved of creating the mathematical models of the processes of diagnostics of the system «machine - attachment - tool - slug».

The problem of optimization of the stress-strain state of spatial beam structures with incorporation on elasto-visco-plastic base was reviewed. The rheological models of bases were analyzed. A block diagram of the mathemati-cal model of the construction optimization was developed. The objective function for optimization was defined.

A design and the results of testing the mechanical shock absorber containing a body, in the bottom part of which there is a shaft forming together with a nut interacting with it via the spline joint a clearance is considered. Inside the bottom part of the body there are rows of damping rubber elements in the form of a ball which are separated by metal rings, and in the upper part of the body above the damping elements there is a piston fixedly connected with the shaft. The main advantages of the described design and the results of the pilot tests of samples proving the constructions operability are highlighted.

This study subject is methods of elimination of open gas blowout and fire. The threat of directed blowout of reservoir fluids onto the earth surface is observed during the entire cycle of oil-and-gas well construction. Such mining engineering construction ensures hydrodynamic communication between the rock beds and the earth surface. To the authors’ opinion the main cause of emergences and gas showings occurrence is failure to observe the industry safety requirements.

Based on the results of the hydro-geo-ecological investigation carried out at acting drinkable water intakes lo-cated at settlements within the limits of the KHMAO-Yugra territory an estimation was made of sanitary-engineering state of water-intake facilities and ecological state of the sanitary protection zone. A complex of measures is recommended the implementation of which will enable to improve the exploitation and to prevent fresh ground waters pollution.

This paper is dedicated to studying the causes of small thermokarst lakes number change in the territory of the Bovanenkovo gas field (Western Yamal) happened for the last 30 years. The relations between small thermokarst lakes dynamics and some natural environment factors were identified. These factors include a geomorphological level, microrelief, thermal conductivity of the upper five meters of the the permafrost stratum section. A mechanism of small thermokarst lakes emerging and disappearing was proposed.

This article is devoted to studying the properties of water and its model. It is shown that the existing models are not able to explain the entire set of properties of water, considering water as a non-equilibrium system and possessing the properties of self-organization and sensitive to weak field effects. The results of the authors’ research confirm a cluster-fractal model which considers water as a mixture of free molecules and fragments with the ordered hexagonal structure. It is shown that pure water electric conductivity depends on concentration of ions and the water capability of a relay way of transfer of these ions, which depends on its structural- information state.

In this paper we consider the possibility of modeling the performance characteristics of the electric drive with a vortex electric pump. The structure of the vortex electric pump studied for the experiment is considered, as well as its Q-H characteristic. To determine the optimal control limit of square-law characteristic of H = f (Q) we offer an ade-quate mathematical model of working Q-H characteristics of the electric vortex pump Pk 200. It is concluded that for studying and searching for optimal performances of the vortex pump Pk 200 the model of square-law characteristic H = f (Q) in accordance with the general expression for the working section can be applied within a certain range of values, i.e. the flow rate from Q1 (1,5) to Q2 (3,5) and the pressure from H1 (67) to H2 (30).