Articles

Geology

Methods of complex reinterpretation of geophysical data in the search for oil deposits in the terrigenous devonian sediments on territory of Tatarstan

Andreeva E.E., Borisov A.S., Baranova A.G., Valeeva A.V., Koluzaeva K.Yu.

DOI: 10.24412/2076-6785-2023-3-32-37

Abstract
The article deals with the techniques of kinematic and dynamic analysis of time sections of the common depth point method (CDPM) in combination with the data of gravity and magnetic exploration. Seismic velocity, as a petrophysical indicator of precipitation characteristics, is closely related to lithology, porosity, density, permeability, oil and water saturation. Magnetic prospecting finds application in the identification and tracing of discontinuous violations of the foundation, in predicting the distribution areas of hydrocarbon traps that are genetically related to zones of tectonic fracturing. The fracture zone is a weakened section of the section characterized by a density deficit, in the local gravity field it is reflected by negative anomalies of ∆g loc. The performed research allows the authors to conclude about the high efficiency of the proposed methods of complex reinterpretation of geophysical data in the search for oil deposits in the terrigenous devonian on the territory of Tatarstan.

Materials and methods
The work uses materials of geological exploration, in particular the results of exploration geophysics for the search for hydrocarbon accumulations. A comprehensive reinterpretation and comparison of data makes it possible to increase the probability of detecting new hydrocarbon deposits.

Keywords
terrigenous devonian sediments, complex interpretation, magnetic exploration, gravity exploration, seismic exploration

Reasons for the formation of an inclined water-oil contact of the Jurassic layer of the Festival deposit

Kuziv K.B.

DOI: 10.24412/2076-6785-2023-3-26-30

Abstract
In the process of creating geological models of oil deposits in order to assess hydrocarbon reserves, problems arise in substantiating the hypsometric position of the OWC surface (oil-water contact). The analysis of geological and geophysical materials shows that in nature there are practically no deposits where the surface of the OWC could be represented as a horizontal surface. The article discusses the regularities of the position of the water-oil contact of the reservoir of the productive formation U1 of the Festivalnoye field, identified in the process of geological modeling based on the analysis of the oil and gas bearing system.

Materials and methods
The results of geophysical studies of wells, as well as data on the reservoir geophysical interpretation of the deposit. Analysis of the relationship between the marks of structural surfaces and the position of the oil water contact. Paleotectonic analysis. Justification of inclined oil-water contact.

Keywords
Western Siberia, Jurassic deposits, inclined oil-water contact, tectonics

Tectonic development of the southern part of the Mansi syneclise in the mesozoic-cenozoic time (Western Siberia)

Kuznetsov R.O.

DOI: 10.24412/2076-6785-2023-3-19-25

Abstract
A technique of paleotectonic analysis was applied to restore the tectonic development of the southern part of the Mansiysk syneclise, taking into account rock compaction effect. It has been quantitatively confirmed that the main increase in the amplitude of structures of the southern part of the Mansiysk syneclise occurred in Cretaceous; during the Cenozoic stage of the development of the territory, there was no a significant increase in the amplitude of the structure. The results of the tectonic development analysis are a basis for reconstructions of naftidogenesis processes and a forecast of oil and gas fields.

Materials and methods
Materials: information from multi-scale geological and geophysical studies, including core studies, well logging interpretations, regional and local seismic data.
Methods: well logging and seismic data interpretation techniques, paleotectonic method, methods of mathematical modeling of the evolution of the sedimentary basin cover were used.

Keywords
sedimentary cover of the West Siberian geosyneclise, tectonic development, paleostructural sections, rock compaction effect, oil and gas fields

Search for new oil and gas accumulation objects in the Lower-Middle Jurassic complex of the Kara-Yamal-Gydan region of Western Siberia

Zinatullina L.I.

DOI: 10.24412/2076-6785-2023-3-14-17

Abstract
The article presents the results of paleotectonic reconstructions of poorly studied deep-lying Lower-Middle Jurassic deposits
of the Kara-Yamal-Gydan region of gas and oil accumulation. Promising, from the point of view of oil and gas accumulation, objects in these complexes are identified. The regime of paleotectonic movements during the Lower-Middle Jurassic time of geological history in the study area has been studied. The results obtained allowed us to draw conclusions about new objects of oil and gas accumulation.

Materials and methods
Using the software package and modeling technologies PetroMod of the company Schlumberger, the reconstruction of the evolution of the sedimentary basin throughout the entire geological history of development was carried out. Methods of basin analysis and analysis of hydrocarbon systems were applied. The objects of study were the Lower-Middle Jurassic deposits of the Kara-Yamal-Gydan region.

Keywords
oil and gas prospects, Western Siberia, pre-Jurassic deposit,
Lower-Middle Jurassic deposit, Yamal Peninsula, Gydan Peninsula, paleotectonic reconstructions

Hydrogeochemical studies as an additional tool for the analysis of oil field development

Lyalin A.A., Vasiliev V.V., Merkulov A.V.

DOI: 10.24412/2076-6785-2023-2-19-22

Abstract
To analyze the development of an oil field, many different tools are used, such as field-geophysical studies, hydrodynamic studies, permanent geological and technological models, etc. At the same time, the information obtained from the results of hydrogeochemical analysis, which carries valuable data on the ongoing processes in the reservoir, including in individual wells, is often not fully used. The authors of the article propose a mathematical tool for analyzing hydrogeochemical data, which allows analyzing the processes of reservoir flooding, including existing problems. The essence of the method is to identify deviations of the component composition when mixing reservoir and injected water. This analysis makes it possible to identify a discrepancy between the percentage of components and the volume percentage of injected and reservoir water, which gives additional information about the flooding process, as well as possible problems in the wells. This method does not require any additional costs for special studies and uses standard hydrogeochemical information obtained in the field. The proposed approach can serve as an additional tool for analyzing the development of oil fields.


Materials and methods
The analysis of hydrogeochemical data is carried out using the mathematical tool proposed by the authors. Possible deviations (behind-the-casing flows, water interactions with the rock and with each other, etc.) occurring in wells during flooding have been identified.

Keywords
hydrogeochemical methods; analysis of reservoir engineering; maintenance of reservoir pressure; injected water; reservoir water; associated water; physical properties; chemical composition; percentage; mathematical tool

On the significance of sedimentation-tectonic processes for the structure of local uplifts in space and time

Andreeva E.E., Baranova A.G., Khaziev R.R., Valeeva A.V., Khairtdinov R.K., Ionov G.M.

DOI: 10.24412/2076-6785-2023-2-13-16

Abstract
In the course of the work, structural maps were constructed and analyzed on the surfaces of the horizons of the lower and middle carboniferous, as well as maps of the isopachite local uplift of one of the deposits of Tatarstan. Three separate domes, northern, central and eastern, have been installed on the studied uplift of the deposit. To determine the sequence of development of a number of surfaces, when constructing paleostructural maps, the authors used the isopachic triangle method, according to the constructed maps, the authors received information about the movements, structural forms and the relationship of these forms at different stages of geological history.

Materials and methods
According to logging diagrams and conclusions of well interpretation, the values of the absolute roof marks of the vereyan, bashkirian, tulian, bobrikovian, tournaian and upino-malevian sediments were removed. Structural maps, as well as isopachite maps between the deposits of the middle and lower carboniferous, were constructed from the removed chops. By using the isopachic triangle method, the sequence of the development of the roof surfaces of horizons on the constructed structural maps and isopachite maps is determined.

Keywords
isopachic triangle, structural maps, isopachite maps, carboniferous deposits, spatial analysis

Hydrology

Mineralization of stratal waters of the neocomian aquifer complex of the Western Siberia field

Safiullin I.R., Garaeva N.V., Tsybin S.S., Valeeva E.Z., Shchutsky G.A., Miroshnichenko V.P.

DOI: 10.24412/2076-6785-2023-2-24-29

Abstract
The waters of the neocomian aquifer complex, which includes the waters of the Achimov strata of the AS group of the deposit N, are characterized by a small number of deep samples with a significant spread of mineralization. Therefore, an additional analysis of wellhead samples of produced water was carried out, which showed that the initial sample was noisy due to mixing of formation water with process fluids injected into the formation and water of the waterflooding system. After screening out incorrect samples, the rest of the data indicates a weaker mineralization compared to the accepted one. This indicates the presence of uncertainty in the value of formation water salinity at this field and the need  for additional, better sampling of deep water samples.

Materials and methods
As a material for analysis, wellhead samples of produced water, the results of pore water analysis on a preserved core are used. Data processing is carried out by methods of mathematical statistics using the MATLAB software product.


Keywords
mineralization, ionic composition, reservoir water, water samples, core, injectivity, produced water, fresh water, mathematical expectation

Drilling

Tectonic processes and stability of borehole walls during drilling

Parshukova L.A., Deryabin A.V., Nagorny I.A.

DOI: 10.24412/2076-6785-2023-2-33-37

Abstract
The problems of preventing and eliminating complications and accidents during drilling and fixing wells related to the stability of the walls of wells are still very relevant. Despite the constant improvement of well construction techniques and technologies aimed at reducing time and material costs due to the complexity of geological and technical conditions of well wiring.

Materials and methods
Materials: actual data of drilling of an obliquely directional with a horizontal end of an operational well at a   *** field.
Methods: theoretical study and analysis of the influence of tectonic deformations on the stability of the borehole during drilling, field data on the presence of a tectonic disturbance (fault) that caused the seizure of the drill string and subsequent rock shedding.

Keywords
well drilling, tectonic deformations, borehole stability

Oil production

Developing water shut-off techniques based on low-modulus liquid glass (polymer silicate concentrate)

Yunusov I.M., Isaev A.A., Novikov M.G., Takhautdinov R.Sh., Malykhin V.I., Sharifullin A.A.

DOI: 10.24412/2076-6785-2023-2-63-66

Abstract
This article reviews the studies related to the permeability properties of core samples from terrigenous reservoirs when treated with a polymer-silicate concentrate (PSC): permeability values for water before and after the treatment have been determined, and the results of experimental works and tests have been presented. In the course of research we have obtained the residual resistance factor for water as a ratio of the initial permeability for water obtained before the reagent injection to its remaining value (after the treatment). The conclusions and guidelines for
the application of the PSC technology have been presented.

Materials and methods
Materials: a unit to determine the oil displacement factor and phase permeabilities on standard core samples under simulated reservoir conditions, core samples of terrigenous reservoirs, the PSC margin, samples of formation water and hydrochloric acid. Methods: removal of infiltrated water, evacuation, saturation with a saline water, determination of effective permeability for water, injection of PSC margins, determination of final permeability.

Keywords
terrigenous reservoirs, water flooding of oil-bearing formations, permeability properties, alteration (redistribution) of filtration flows, conformance control

Selection of an alternative hydraulic fracturing fluid in the conditions of a low permeability gas reservoir turonian

Vylomov D.D., Shulgin P.A., Shakirov R.R., Snohin A.A.

DOI: 10.24412/2076-6785-2023-2-56-61

Abstract
Taking into account the accumulated knowledge regarding the choice of hydraulic fracturing fluids and their subsequent approbation within
the framework of pilot industrial and research works on the Turonian deposits of analogous deposits, an alternative hydraulic fracturing fluid was selected, the use of which will reduce the negative impact on productive formation (relative to fresh water), as well as to increase the environmental and economic component of the work as a whole in relation to hydrocarbon-based hydraulic fracturing fluid (diesel fuel).

Materials and methods
Based on an analytical review of the accumulated knowledge base regarding the choice of hydraulic fracturing fluid for the deposits of the Turonian stage (T) and carrying out our own laboratory tests of the core, recommendations were formed on the use of an alternative hydraulic fracturing fluid for the purposes of pilot work on the considered asset.

Keywords
turonian stage, hydraulic fracturing fluid, laboratory-based core analysis, linear expansion of clays

Performance of fractured wells with complex geometry hydraulic fractures modeling

Andreev E.Yu., Volkov M.G., Islamov R.A., Makeev G.A., Sotnichenko I.V.

DOI: 10.24412/2076-6785-2023-2-51-54

Abstract
The development of hard-to-recover reserves with reservoir permeability less than 0,5 mD poses challenges for specialists to increase the profitability of oil production. The main direction of solving this problem is to increase productivity by drilling horizontal wells with a liner length of more than 1 000 m and performing multi-stage hydraulic fracturing. The design and implementation of promising designs of hydraulic fracturing fractures requires new approaches to assess their predictive productivity. Existing analytical and numerical methods for calculating predicted productivity use average fracture parameters. In practice, designs are often characterized by complex geometry and uneven distribution of conductivity in the volume of the hydraulic fracture. The use of incorrect algorithms for determining the average parameters of fractures leads to a significant deviation of the dynamics of the actual well flow rate from the calculated one. This leads to the use of non-optimal designs during hydraulic fracturing and a decrease in the profitability of extraction from hard-to-recover resources. To improve the quality of evaluation of hydraulic fracturing design efficiency, a technique for integrating a hydraulic fracturing simulator and a hydrodynamic simulator has been developed, which allows performing a correct calculation of well productivity.

Materials and methods
To solve the problem, the work proposes:
    designing perspective designs in hydraulic fracturing simulator;
    import of designed designs into hydrodynamic simulator;
    calculation of well productivity with designed hydraulic fractures in a hydrodynamic simulator;
    selection of an effective design for pilot testing and implementation.

Keywords
hard-to-recover reserves, hydrodynamic modeling, hydraulic fracturing, hydrodynamic simulator, hydraulic fracturing simulator

Offshore Arctic hydrocarbon deposits. The Architectures optimization of production facilities to design subsea systems

Beskhizhko Yu.V., Ermakov A.I., Beskhizhko V.V.

DOI: 10.24412/2076-6785-2023-2-44-47

Abstract
Offshore Arctic hydrocarbon fields development in the Russian Federation using subsea production systems is determined by a wide range of different factors.
It is proposed to consider the architecture of the field development as a 3D model with extended and concentrated objects, including wells, subsea completion of wells, pipelines and other elements of the subsea production systems.
The necessity and possibility of using optimization approaches for designing the architecture of a hydrocarbon deposit subsea development in arctic conditions is shown.
The practical implementation of the method for searching for the optimal architecture of the development of the Arctic field for the generalized case field with several deposits is performed on the basis of a previously developed search algorithm on a 3D model for the optimal configuration of subsea production systems and wells between two points based on the Bellman-Ford optimality principle and the Lee algorithm.

Materials and methods
The experience of the Russian Federation in the optimal design of linearly extended objects and the analysis of arctic conditions. Existing methods of optimization of trunk pipelines.

Keywords
subsea production systems, optimization, development, Arctic

Experience of drilling multilateral wells in carbonate deposits of the Osinsky horizon

Sokolyanskaya E.V., Fedorova A.A.

DOI: 10.24412/2076-6785-2023-2-38-42

Abstarct
The article presents the results of determining a more effective well construction for the area improved reservoir properties of zones in the ring structures of carbonate reservoir. This reservoir is characterized by low permeability and high compartmentalization. The stratum is actually developed by directional and horizontal wells. Based on the analysis of well efficiency the productivity of horizontal wells is higher the productivity of directional wells. In order to assess the development prospects, a full-scale reservoir simulation model (dynamic flow model) was created for prediction simulations. Based on the results of reservoir model simulation, it was found that the best method for drilling is the MLT.
The recommended design was implemented in the Osinsky horizon. The positive effect of drilling have been scaled to the Osinsky horizon.

Materials and methods
An analysis of the conducted seismic surveys was carried out,
the approach to identifying the ring structures of the patch reef zone was determined. Potentially productive zones for drilling in the area of ring structures have been identified. An assessment of various well design options was carried out using a reservoir simulation model (dynamic flow model).

Keywords
multilateral well, low permeability, carbonate reservoir, oil and gas field

The utilization of composition with spurt loss for control absorptions during killing wells in low-temperature terrigenous reservoirs in Eastern Siberia

Nikulin V.Yu., Britov E.V., Mukminov R.R., Shangin A.V., Khokhlov D.I.

DOI: 10.24412/2076-6785-2023-1-76-80

Abstract
The article considers the peculiarities of well killing in the conditions of terrigenous high-permeability reservoirs, typical for Eastern Siberia in the example of formation VCh 12 of Verkhnechonskoye oil-gas-condensate field are described. Studies of the instantaneous filtration composition for the purpose of controlling absorptions during well killing and field tests of the technology were carried out. The results testify to promising application of compositions with spurt lossfor killing wells in complicated conditions, exploiting terrigenous reservoirs of Eastern Siberia.


Materials and methods
Analysis of the application of killing technologies with bottom-hole zone blocking in the Verkhnechonsk oil and gas condensate field. Substantiation of a choice of the new technology on the basis of the world experience. Physico-chemical and filtration studies of the new composition in the conditions of the considered object. Analysis of the results of field testing of the considered technology on the well.

Keywords
well killing, abnormally low reservoir pressure, low temperature, fluid loss, blocking compounds, composition with spurt loss, Eastern Siberia

Oil migration on the last stage of oil fields development

Suleymanova M.V., Safin A.Z., Mironenko A.A., Badretdinova A.A., Valiullin T.I., Garipov A.R.

DOI: 10.24412/2076-6785-2023-1-72-75

Abstract
The migration of residual oil is partial flow of reserves that was displaced into zones with no production wells or from unswept zones after well shutting. This process is facilitated by favorable geological conditions, such as high continuity, permeability and connectivity of the formation, and the presence of anticlinal dome. Based on the results of drilled transit wells, the oil migration effect was confirmed, recommendations
for further development of shallow marine sandstone of one of the fields in Western Siberia were given.

Materials and methods
This paper presents an algorithm for oil field secondary development at a late stage of development, is proposed, which includes
the integration of research: selection and analysis of a new core, revision of the reservoir properties of rocks, conducting gyroscopic studies on old wells, analyzing the saturation of transit wells, rebuilding a hydrodynamic model with new data.

Keywords
oil migration, the last stage of oil field development, the development
of residual oil reserves

Improving the efficiency of development new oil and gas condensate reservoirs using a method for selecting an analogue (part 2)

Abdrakhmanova E.K., Islamov R.R., Kuzin I.G., Nigmatullin F.N., Antakov I.S., Kuznetsov A.M., Gilaev G.G.

DOI: 10.24412/2076-6785-2023-1-66-69

Abstract
The article presents the example of searching for an analogue, the adaptation of the hydrodynamic model of the target reservoir on the history of the selected analogue development and searching optimal development option by carrying out multivariate calculations.

Materials and methods
Characteristics of displacement of an analogue reservoir object.
Using an analogue object to verify the hydrodynamic model of a new reservoir object.

Keywords
hydrodynamic model, development system, multivariate calculations, geological-physical characteristics, analogue, oil and gas condensate reservoir

Analytical search of candidate wells for repair and insulation works on the example of fields in Western Siberia

Yalashev I.I., Ganiev Sh.R., Zhdanov L.M., Nikitenko V.Y.

DOI: 10.24412/2076-6785-2023-1-61-65

bstract
The article presents the experience of calculating the potential for reducing water production, developed as part of a project to reduce the cost of lifting well products. The idea of the work is to calculate the probability and volume of water production exceeding the level of current production of oil reserves. It is assumed that the positive difference between the actual and theoretical water cut calculated from the production of oil reserves in the well determines the potential for reducing water production and is associated with extraction from an inappropriate interval, or with a violation of the integrity of the well structure, or with water breakthroughs through highly permeable layers, or cone formation. The probability of extraction of foreign water is estimated by the degree of compliance with the signs of abnormal flooding.

Materials and methods
The article describes a methodology for analytical search of candidate wells for repair and insulation works based on the developed criteria. Geological and field data of monthly operational reports, data of technological modes, data on perforation intervals and information of design. The results of the calculations allow us to assess the economic efficiency of potential measures to reduce water production.

Keywords
squeeze job, water shut-off operations, casing patch operations, foreign water, productivity coefficient, water cut, premature watering

Pipeline

Weldability of duplex steels for the transport of aggressive media containing hydrogen sulfide and carbon dioxide

Filisteev V.G., Steklova E.O., Berezovsky A.V.

DOI: 10.24412/2076-6785-2023-2-70-75

Abstract
The industry looks for new steel types, as requirements for steel strength properties in corrosion environment are becoming more stringent. Duplex stainless steels have a chance to become the most advantageous material for a number of industries. The technical interest in these alloys is due to the improvement of steel production technology, as producers found an opportunity to control nitrogen content more precisely.
The paper highlights a need to study joints weldability and corrosion resistance to hydrogen sulfide stress cracking (HSC), hydrogen
cracking (HC), intercrystalline Corrosion (ICC), knife-line attack (KLA), and pitting corrosion to assess the possibility of using duplex steels in the production of structures designed for operation in corrosion environment.

Materials and methods
To assess the possibility of using duplex steels in the manufacture of structures operated in aggressive environments, it is necessary to study the weldability of these steels and the corrosion resistance of welded joints, including against hydrogen sulfide stress cracking, hydrogen cracking, resistance to intercrystalline and knife corrosion and pitting corrosion.

Keywords
weldability of duplex steels, transmission of corrosion media, welding materials, welding parameters

Duplex steels for transport of corrosive media containing hydrogen sulfide and carbon dioxide

Filisteev V.G., Steklova E.O.

DOI: 10.24412/2076-6785-2023-1-82-87

Abstract
Since the 1950s, the gas industry has encountered pipeline accidents that could be related to the presence of hydrogen sulfide (H2S). Natural gases represent a mixture of individual gases (components), predominantly consisting of saturated hydrocarbons. At the same time, natural gas may contain up to 1825 % of hydrogen sulfide, up to 25 % of carbon dioxide, and small volumes of nitrogen and hydrogen. The article studies conditions and impact factors, when hydrogen sulfide causes destruction of pipelines made of steels of various grades. The paper proves that steels with a duplex structure are more resistant to hydrogen cracking and hydrogen sulfide stress corrosion cracking.

Materials and methods
The study considers duplex steels with good weldability, relatively high yield and strength limits regarding satisfactory ductility and impact strength. This provides less specific metal consumption in the manufacture of structures calculated for strength due to a decrease in the sheet thickness.

Keywords
duplex steels, transmission of corrosive media, hydrogen sulfide content, carbon dioxide content

Engineering services

Experience in providing engineering & procurement services in oil and gas industry

Panin M.O., Kitaeva T.Yu.

DOI: 10.24412/2076-6785-2023-2-80-85

Abstract
The purpose of this work is to analyze the reasons for the appearance of engineering service direction for equipping facilities in the oil and gas industry. The basis is the experience of providing consulting services from TomskNIPIneft JSC for Companies within the perimeter of NK Rosneft PJSC as well as the authors experience in analyzing and re-engineering the business processes of equipment and material procurement and logistics of the Gas block companies from the perimeter of NK Rosneft PJSC.
Identification of characteristic reasons for demand for the direction of engineering services for the equipment and material procurement of oil and gas production facilities, as well as prospects for the development of this direction.

Materials and Methods
To analyze business processes, the methodology, approaches and project management body of knowledge were applied: PM Book [1], Agile [2], Prince2. The BPMN and Unified Modeling Language (UML) notations were used to describe business processes.

Keywords
procurement in construction, deliveries, logistical support, infrastructure development of oil and gas production facilities