Regression analysis, as the most simple and understandable way to predict parameters, has received a wide coverage, including in geosciences. The error of this method can be estimated by such parameters as correlation coefficient and standard error. Cross-validation (cross-validation) is one of the ways to assess the stability of a model in which part of the input does not participate in the analysis, but it is uses for evaluation. Usually cross-validation is not used in regression analysis, however, using these approaches in aggregate, it is possible to estimate the correlation coefficient and the standard error for each of the implementations, as well as evaluate the contribution of input data to a particular well. It is possible to identify problem points in the initial data at the stage of mapping.

   Most newly discovered deposits are very complex, where traditional and accepted methods for interpreting GIS data and core studies are not working, but there is still a need for a qualitative estimation of hydrocarbon reserves and forecast of hydrocarbon production. A program of core studies has been developed depending on the type of rocks and a saturation model has been configured. Purpose of this work is to estimate the true hydrocarbon reserves in complex fields and the main task is the evaluation of petrophysical parameters in conglomerates.

   The area of Chona field that is explored with transient electromagnetic survey is 3350 square kilometers that is about 50 % of the whole license area. At the moment the approaches to integration TEM data in geological modelling directly are developed since taking into account TEM data can reduce uncertainty of reservoir saturation. The approach to analysis of TEM data and its application in geological modelling process to determine reservoir saturation and reduce uncertainty of OWC/ GOC is provided. The process is a multivariant modelling of electrical properties as specific electrical resistance and longitudinal conductance that correspond to geological realizations and comparison of synthetic electrical properties with properties that were obtained from TEM data inversion. The problem of geological realization ranking and optimal value of uncertain parameters determination is solved with calculation of residual error between synthetic electrical parameters and measured ones..

   This article is about first results of realization of drilling bit production import substitution plan on territory of Russian Federation, specifically of stage of searching for potential producers, production and first Russian Polycrystal Diamond Cutters (PDC) testings on objects of PJSC Gazprom Neft. In following article the results of first operations reviewed and further goals established.

   The article is devoted to geomechanical research in wellbore stability analysis area. It’s related to solid production prediction and maintaining borehole zone in stable conditions during recovery. The research attempts to answer the question – what the bottom hole pressure should we use (and could we decrease it) to avoid uncontrolled solid production and wellbore collapse. This need is often associated with maintaining production at a planned level for economic reasons. The main tool in such analysis is a qualitatively constructed 1D geomechanical model (1D MEM – Mechanical Earth Model). This article presents a methodology which allows to predict of borehole zone criticality and to define allowable and critical drawdown pressure.

   The paper provides an analytical solution for the Pseudo3D model for fracturing in a simplified geomechanical setting. The problem is solved in dimensionless parameters to ensure the universality of the solution. Dimensional lengths on height are plotted, as well as the Aspect ratio graph of the crack for different toughness. The existence of the global maximum Aspect ratio is shown. The obtained solution allows to quickly find the geometry of the fracture during the development, as well as to estimate the required volume of fluid injection to achieve the desired fracture length, including for hybrid fracturing with several liquids.

   The reservoir pressure maintenance (RPM) system is the key to ensure design parameters and high performance of an oil field, which oil production directly depends upon. Maintaining and increasing the base production level requires continuous monitoring of the field production system. In order to timely detect and correct deviations in behavior of production and injection wells, a RESERVOIR-WELL-INFRASTRUCTURE digital model needs to be created. Introduction of a Pumping Station-Waterlines-Wells-Reservoir digital model is a new systematic approach to management of the waterflooding process as the oil field is produced.

   The paper presents generation methods of dynamic adaptive unstructured PEBI-grids for efficient multiphase filtration modeling of complex structure reservoirs with multiple structural and technology features (faults of complex geometry, inclined and horizontal wells, including hydraulic fracturing). We have developed the algorithm of local grid rearrangement due to newly opened wells and hydraulic fracturing, reducing simulation time. Three-phase filtration problem has been solved numerically, accounting for gravitational, viscous and capillary forces and phase transition of hydrocarbon components. Original numerical method for direct flow computation in hydraulic fractures is proposed.

   The article is devoted to the description of the methodology for estimating the average reservoir pressure for fractured wells or horizontal wells in the presence of a well test with only a linear flow period. Testing on artificial and real examples showed that the deviation of the results is less than 7 %. The described technique can be used to increase the efficiency of the development by increasing the efficiency of the geological and technical measures, as well as reducing the costs and losses of oil for ineffective well testing.

   One of characteristic features of oil-gas-condensate fields is the flow of a highly gaseous multi-phase fluid in wells and gathering system pipelines. Due to the high gas content, the fluid flow is unstable with pockets forming in the pipelines. This causes problems in operation of the fluid production, gathering and treatment systems which requires a special approach to engineering of the oil-gas-condensate field infrastructure. Based on performed research and selected engineering criteria, it is considered reasonable from both technical and economic standpoint to make the choice of a gas/liquid transportation method (combined or separate) when the field production system is being designed. A systematic approach to controlling multiphase flows allows the field operator to determine the required fluid flow parameters and develop measures to ensure flow stability and, accordingly, set up a safe and efficient fluid production and transportation process

   Associated petroleum gas (APG), derived from gravity separation processes emulsion in commercial preparation is a mixture of light gas components (methane, ethane), and heavier hydrocarbons C 3+ (propane and above) and a pair of easy oil. The presence in the gas stream of heavy hydrocarbons leads to the unsustainable use of natural energy and complications in the operation of gas consuming equipment, collection systems and transport gas. To improve the efficiency of production processes is important to develop a solution aimed at the preparation of associated gas. Research and analysis of existing technologies has shown that the best method is low-temperature separation with the external refrigerant circuit. The selected technical solutions allow to reduce the power consumption of the implemented installation by 20 %, reduce the number and dimensions of the basic devices and use of highly efficient equipment in modular design high operational readiness.

   Nowdays the deployment of modern technological solutions has become one of the highest priorities. One of the challenges of effective management of the portfolio of technological projects is the different approaches to assessing effects of the project on replication. The article presents an approach to unification the assessment process. This will helps to effectively manage the project portfolio Technology strategy. Also the author proposes an optimization algorithm of developing targeted plans for applying technologies for different scenario condition. The algorithm solves a problem, similar to Knapsack problem. The result is the schedule governing the applying of new technologies (when? where? how?).

   Permanent model of on-line reserves and resources monitoring is the user friendly software directed on getting information about resource base. The main advantage of this model is aggregation of various data bases about reserves and resources and its smart analysis in global view. The model is adapted both for management decisions and expert’s analysis. Using this instrument allows to reduce time on data acquisition and processing and increase strategy decisions speed.