Articles

Geology

Stochastic inversion for including seismic data in 3D modeling

Gaifulina E.F., Reshetnikov A.A., Shvydkoy V.S., Dorokhov A.R.

DOI: 10.24412/2076-6785-2022-8-16-21

Abstract
Presented in the article results show how to effectively integrate seismic data into 3D modeling using stochastic inversion, thereby increasing the reliability of the obtained geological models. For the deposits of PK1920 formations, on the basis of stochastic inversion, an areal forecast of sedimentation environments (facies) identified from well data was made. The resulting three-dimensional geological model more accurately emphasizes the heterogeneity of the distribution of properties in the geological environment, which is especially important when planning production drilling.

Materials and methods
The paper implements the technique of stochastic seismic inversion and analysis of the obtained results for inclusion in a three-dimensional geological model. Angle stacks, well curves of elastic properties and facies, a stratigraphic framework of a three-dimensional geological model were used as input data.

Keywords
stochastic (geostatistical) inversion, facies

Analysis of the field of seismic classes in the modeling of paleo cuts of the vikulov deposits on the example of the sector model of the Krasnoleninsky arch of Western Siberia

Bembel M.R.

DOI: 10.24412/2076-6785-2022-8-10-14

Abstract
In the process of creating geological and hydrodynamic models and designing the development of objects associated with the vikulov formation, the most difficult task is mapping and further spatial modeling of the so-called paleo cuts. The process of constructing a conceptual geological model of the object VK (vikulov formation) includes the identification of embedded river valleys in the deposits of the vikulov formation according to a set of criteria established according to seismic data, geophysical studies of wells and core. Sandstones of the embedded valley complex filling are characterized by a coarser-grained structure and better filtration and capacitance properties. The oil-water contact in these deposits is lower than in the host rocks, and the flow rates are higher. The geometry of prospective deposits within paleorusels is controlled by the distribution of reservoir sandstones within the valley fill.

Materials and methods
A statistical analysis of borehole data was performed, the trend fields of the sandiness coefficient and the positions of the oil-water contact were calculated.

Keywords
inflow control, inflow control devices, carbonate reservoir, oil and gas field

Development of the northern (including the Kara sea) and northeastern territories of Western Siberia (Yamal peninsula)

Yurova M.P.

DOI: 10.24412/2076-6785-2023-5-20-22

Abstract
The northern (including the Kara Sea) and northeastern territories of Western Siberia (the Yamal Peninsula) are being considered, which in the near future may become a priority territory in which gas deposits will be discovered on deep horizons (Permo-Triassic). This is confirmed by the interpretation of seismic profiles in the north-west of the Yamalo-Nenets Autonomous District (Paleozoic with a capacity of 1 500 m). Paleozoic terrigenous deposits are common within the South Kara syneclise.

Systematization of mega-reservoir accumulations of oil and gas in the sedimentary deposits

Punanova S.A., Samoilova A.V.

DOI: 10.24412/2076-6785-2023-5-16-19

Abstract
Based on the analysis and generalization of factual material, the article systematizes ideas about the formation of oil and gas mega-reservoirs in the sedimentary cover of oil and gas basins in Russia and the world. These are accumulations of hydrocarbons that accumulate large reserves both in traditional reservoirs and in reservoirs of unconventional low-porous shale formations, in reservoirs with hard-to-recover reserves of extraviscous
oils and natural bitumen deposits, as well as in reservoirs of decompacted ledges of the crystalline basement.

Diagnostics

Graphical method for determining the parameters of the skin zone based on transient temperature and pressure data in RN-VEGA

Akhmetova O.V., Urazov R.R., Davletbaev A.Ya., Mardamshin R.R., Sarapulova V.V., Gimaev A.F., Zyljova S.A., YakupovR.F., Pestrikov A.V.

DOI: 10.24412/2076-6785-2023-3-74-79

Abstract
The article describes an algorithm for determining the mobility and radius of the skin zone based on semi-log and log-log analyses of diagnostic plots of pressure and temperature transient data. The use in the analysis both of the plots of temperature change and its derivative distinguishes the work joint graphical analysis of diagnostic plots presented from other methods. To verify the method, we used temperature synthetic data in the reservoir generated by the RN-VEGA.

Materials and methods
We have presented a comparison of applying various graphic methods. It showed that producing reservoir and fluid properties in the skin zone and in the remote reservoir zone can be estimated using both transient temperature and pressure data dynamics. Analysis of two diagnostic temperature plots improves the result.
The models describing the pressure behavior in a radial composite reservoir, built taking into consideration the diagnostics results, showed good convergence with field data.

Keywords
radial composite reservoir, Thermal dynamic well test, skin-factor, graphical analysis, diagnostic plot

Oil production

Method of automated selection of horizontal wells for repeated selective multistage hydraulic fracturing

Sinitsyna T.I., Zemtsov Y.V.

DOI: 10.24412/2076-6785-2023-4-22-27

Abstract
To ensure consistent effect of the repeated selective MSHF technology, the geological and engineering criteria have been defined in this work and a decision-making algorithm for ranking and selecting well-candidates for repeated MSHF in horizontal wells has been developed. The algorithm is successfully applied to maintain the level of oil production in VK1-3 zones of the Kamenny Area of Krasnoleninsky Field covered by horizontal wells. At the end of 2022, pilot tests of the repeated selective MSHF technology in 12 horizontal wells were carried out. The EOR measures implemented in these wells have been recognized as successful both technologically and economically.

Materials and methods
Moreover, a tool for automated selection of well-candidates for repeated selective MS fracs in horizontal wells based on MS Excel (using the Visual Basic programming language) has been created and tested.

Keywords
repeated selective multistage hydraulic fracturing, horizontal well, candidate-well ranking algorithm, candidate-well selection criteria, automated candidate-well ranking tool

Reducing the negative impact of high density killing solutions on the productivity of gas wells operating Achimov reservoirs. Part 2. Rationale for the use of blocking compositions

Nikulin V.Yu., Mukminov R.R., Nigmatullin T.E., Mukhametov F.H., Khaziev L.B., Subkhangulov A.R., Zakharzhevsky Yu.A., Savchuk D.V., Kurmanchuk N.S.

DOI: 10.24412/2076-6785-2023-4-16-21

Abstract
The article considers peculiarities and complications of killing gas wells in Achimov reservoirs (Ach3-4 and Ach5 2-3 formations of Novo-Urengoi and Vostochno-Urengoi license areas) using blocking compositions. The research has shown that suspension blocking compositions thickened with xanthan and starch are applicable for blocking of the bottom-hole zone in the presence of hydraulic fractures and withstand repression of no less than 14 MPa. The prospects of continuing research of blocking compositions thickened with surface active substances have been confirmed.

Materials and methods
Rationale for a new technology for killing with bottomhole zone blocking based on international experience and analysis of geological and technical conditions of the Novo-Urengoyskiy and Vostochno-Urengoyskiy license areas. Physical-chemical and filtration studies of high-density blocking compositions in the conditions of the object in question.

Keywords
Urengoyskoe field, well killing, gas wells, abnormally high reservoir pressure, high temperature, fluid loss, blocking compounds, suspensions, modification

Reducing the negative impact of high density killing solutions on the productivity of gas wells operating achimov reservoirs. Part 1. Selection and modification of heavy killing fluids

Nikulin V.Yu., Mukminov R.R., Nigmatullin T.E., Mukhametov F.H., Khaziev L.B., Subkhangulov A.R., Zakharzhevsky Yu.A., Savchuk D.V., Kurmanchuk N.S.

DOI: 10.24412/2076-6785-2023-3-52-57

Abstract
The article deals with peculiarities and complications when killing gas wells in conditions of Achimovsky reservoirs (Ach3-4 and Ach52-3 formations of Novo-Urengoyskiy and Vostochno-Urengoyskiy license areas). In particular, there is intensive absorption of liquids, reduction of well productivity, corrosive effect on downhole equipment, and loss of stability in high temperature conditions. The dependence of the change in the skin factor on the density of the basic polymer-clay drilling mud used for killing the well has been determined. On the basis of the conducted complex of laboratory tests it was established that the modified high-density solutions on the basis of calcium chloride and calcium nitrate mixture (density 1 600 kg/m3) and zinc chloride and calcium bromide mixture (density 1 910 kg/m3) provide high recovery of formation model permeability after killing.

Materials and methods
Analysis of the results of application of killing technologies at the
Novo-Urengoyskiy and Vostochno-Urengoyskiy license areas. Substantiation of a choice of new technology on the basis of world experience and results of researches of basic applied fluids. Physical-chemical and filtration studies of high-density modified salt solutions in the conditions of the object in question.

Keywords
Urengoyskoe field, well killing, gas wells, abnormally high reservoir pressure, high temperature, fluid loss, blocking compounds, suspensions, modification

Electrical engineering

Modern methods of monitoring and technical diagnostics of electrical machines

Zavidey V.I., Putilova I.V., Starshinov V.A.

DOI: 10.24412/2076-6785-2023-4-38-44

Abstract
The article provides an analysis and selection of approaches to the construction of a system for monitoring and assessing the technical condition of powerful electric machines based on multiparameter methods and the Park method. Practical examples of the use of multiparameter tools on induction motors and transformers using a modified thermal imaging method to increase the recognition of defects are given. The role of training and education of personnel of energy enterprises in the development of new methods in the field of monitoring the state of electrical equipment is noted.

Materials and methods
The solution of the problem of detecting and increasing the probability of recognizing defects on induction motors is achieved through the use of a two-stage monitoring process, in which voltage and currents are monitored on a running engine, data processing by the Park method using a thermal imaging method for monitoring the condition of equipment. At the second stage (on a disconnected motor), if there are signs of a defect, a multiparameter control of the stator and rotor windings is carried out according to a known methodology.

Keywords
asynchronous motors, stator, rotor, monitoring, multiparameter control methods, Park vector analysis method, thermographic method, vibration control

Service

Testing a scale inhibitor squeeze technology into a bottomhole formation zone under the conditions of the Sorovskoye field

Valekzhanin I.V., Rafikov V.N., Sinitsyna T.I., Blokhin D.A., Latypov O.A.

DOI: 10.24412/2076-6785-2023-3-61-66

Abstract
The article describes an integrated approach to preventing scale formation in horizontal wells of the Sorovskoye field, including analysis of producing and complicated well stock, computer modeling and assessment of the risk of scale precipitation in well conditions, laboratory studies of scale inhibitors, including, among other things, an assessment of the adsorption and desorption of the inhibitor on core material. The obtained results of laboratory studies made it possible to develop high-quality designs of scaling inhibitor (SI) injections into the reservoir, to predict the nature and duration of the injection of the injected inhibitor. The results of field tests confirmed the effectiveness of the proposed approach: no complications associated with the formation of salts on the test objects were identified, the duration of the effect was more than 1 year.

Materials and methods
To determine the adsorption-desorption properties of the scaling inhibitor (adsorption isotherm) in order to obtain quantitative data necessary for calculating the volumes of reagent injection into the reservoir and determining the volumes of protected water, laboratory filtration experiments were carried out on natural core samples from the Sorovskoye field.
All studies were carried out on modern experimental equipment, including an UltraPoroPerm-500 (Core-Lab, USA) unit for determining the porosity and porosity properties of samples, a UIK-5(2) filtration unit (Glo-Bel Oil Service, Moscow), which allows to determine the studied filtration parameters with high accuracy.

Keywords
scaling, scale inhibitor, squeeze, oil production complications, failure interval, calcite

Automation

Prediction of temperature distribution along the oil wells during steam cycling

Stepanov V.A., Yasnitsky L.N.

DOI: 10.24412/2076-6785-2023-3-69-73

Abstract
One of the main sources of obtaining information about the degree of heating of the oil reservoir and the effectiveness of steam cyclic treatment of wells is geophysical research, which consists in measuring the temperature in the wellbore using a descent geophysical instrument.
This is a rather laborious and not always successful process. As an alternative, this article attempts to develop an engineering software product capable of predicting the temperature distribution in a well and thus partially or completely replace the downhole survey. The neural network underlying the engineering product was trained on data from the wells of the Usinskoye field. The article notes that forecasting the temperature distribution in wells can allow engineers to find and implement the most rational modes of steam cycling treatment.

Materials and methods
When designing, generating, testing neural networks and neural network modeling, software tools, developments and experience of the scientific school of the Perm State National Research University were used. To train neural networks, a dataset was used, created on the basis of steam cycling data from 50 wells in the Usinskoye field.

Keywords
steam cycling, GIS 55, Usinskoye field, oil, oil reservoir, well, forecasting, neural network, temperature