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Geology
  • Date submitted
    2024-05-15
  • Date accepted
    2025-01-28
  • Date published
    2025-04-30

Study of changes in the void space of core samples under cyclic loading

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The subsurface state is explored and analysed by studying the core material. This is the basis for forecasts, construction and improvement of models. The reservoir properties of rocks obtained from the laboratory study of sample are subject to a system error caused by three main factors: rock selection in the zone of altered stress-strain state, rock removal from the thermobaric conditions of natural occurrence, and the measuring equipment error. A change in the natural stress-strain state of rocks occurs as a result of intervention in the formation system and the entire massif by constructing a well, creating overburden and depression. The rise of the core causes unloading from formation pressure to atmospheric one, natural saturation is lost, temperature conditions change. This affects the reservoir properties and rock injectivity. This study is aimed at investigating changes in the void space of the rock in formation conditions under cyclic loading. Based on the data obtained, a regression forecast of properties is made, excluding external influences. The article describes the results of experiments on multiple loading and unloading of water-saturated sandstone samples by geostatic pressure with precise control of the water displaced and returned to the void space. This method enables us to record the change in the internal void volume of the rock and, as a consequence, elastic and plastic deformations, the value of relaxation of elastic deformations. The dynamics of change in the coefficients of porosity and compressibility from the stress state cycle is estimated and the range of predicted porosity values ​​of the rock in formation conditions is determined. For samples of permeable medium- to fine-grained sandstone, the obtained character of porosity change gives a forecast of the initial porosity in formation conditions of 20.19±0.61 %. Thus, the exclusion of human impact on porosity gives values ​​1.42 % higher than the results of standard laboratory studies.

How to cite: Grigorev B.V., Kraev A.D., Sadykova A.P., Moshonkin A.A. Study of changes in the void space of core samples under cyclic loading // Journal of Mining Institute. 2025. p. EDN HTZPRR
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2023-10-02
  • Date accepted
    2024-11-07
  • Date published
    2025-04-25

Laboratory studies of hydraulic fracturing of intersecting boreholes in a non-uniform stress field

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This study focuses on the features of hydraulic fracture propagation in intersecting boreholes in polymethyl methacrylate blocks in a non-uniform stress field. Glycerol aqueous solution and plasticine were used as the working fluids. According to linear fracture mechanics, a stress concentrator at the borehole intersection contributes to the beginning of crack formation, with further crack propagation occurring in the plane containing their axes. The relevance of this study is due to the search for innovative approaches and the development of technological solutions to address the issue of effective longitudinal crack formation and its further propagation in a rock mass under unfavourable stress field conditions. This paper provides a scheme of laboratory stand operation and a general view of the sealing packers used to isolate a specified interval when performing tests. The graphs of glycerol pressure versus injection time are presented, and the breakdown pressure in the blocks is specified. The shape of fractures formed during the indentation of plasticine into the borehole system was investigated. The findings of physical modelling indicate that longitudinal cracks are predominantly formed in the boreholes. The deviation of the crack trajectory from the vertical plane containing the borehole axes is primarily affected by the magnitude of the horizontal compressive stress field rather than the increase in the angle between them. In addition, the angles of inclination of the longitudinal crack plane measured at its intersection with the side face of the block are specified.

How to cite: Patutin A.V., Skulkin A.A., Rybalkin L.A., Drobchik A.N. Laboratory studies of hydraulic fracturing of intersecting boreholes in a non-uniform stress field // Journal of Mining Institute. 2025. Vol. 272 . p. 100-109. EDN JFQTTE
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2023-10-03
  • Date accepted
    2024-11-07
  • Date published
    2025-02-25

Investigation of the effectiveness of the use of various substances for dust suppression during the transshipment of granular sulfur

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The article is devoted to the problem of dusting during the transshipment of granular sulfur and existing methods of dust suppression. The analysis of various methods for reducing dust emission at granulated sulfur storage and transportation facilities is presented. The necessity of using special reagents to increase the efficiency of dust suppression and re-granulation of sulfur crushed by abrasion is noted. The sulfur dust obtained from the port terminal during the transshipment of technical sulfur was analyzed for granulometric composition. The results of experimental studies of the effectiveness of the use of various substances for sulfur dust suppression (alkyl polyglycosides, sodium silicate, starch) are presented. The laboratory installation was a hopper, inside which a test sample of dusty material was placed. The sample was subjected to an aerodynamic effect by an air flow at a given speed. The concentrations of suspended solids were measured with a dust meter-nephelometer with a sampling tube placed in the geometric center of the hopper. The effectiveness of dust suppression agents was determined based on a comparison of the concentration values obtained on dry and treated samples. For dust suppression at granulated sulfur treatment facilities, it is proposed to use a composition based on nonionic surfactants represented by a mixture of C12-14-alkylglycosides oligomers (1-1.5 %), additionally containing a mixture of amylose and amylopectin polysaccharides in the form of soluble starch (1-2.5 %) and water. The dust suppressor showed consistently high dust suppression efficiency both when measured immediately after irrigation (98.3 %) and after the expected time (99.7 %). The developed composition provides an increase in the dust-suppressing ability of the solution and the elimination of the possibility of repeated dusting due to the formation of a polymer film on the surface, as well as the regranulation of the product crushed by abrasion.

How to cite: Lisai V.V., Smirnov Y.D., Ivanov A.V., Borowski G. Investigation of the effectiveness of the use of various substances for dust suppression during the transshipment of granular sulfur // Journal of Mining Institute. 2025. Vol. 271 . p. 108-119. EDN OBNFBV
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2022-03-01
  • Date accepted
    2024-06-03
  • Date published
    2024-12-25

Study of the possibility of using high mineralization water for hydraulic fracturing

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The results of laboratory studies aimed at developing hydraulic fracturing fluid based on alternative sources of high mineralization water are presented. It is shown that Cenomanian sources have the most stable mineralization parameters, while bottom water and mixed waters collected from pressure maintenance systems differ significantly in their properties, with iron content varying several times, and hardness and mineralization undergoing substantial changes. The quality of the examined hydraulic fracturing fluids based on alternative water sources is confirmed by their impact on residual permeability, as well as residual proppant pack conductivity and permeability. The experimental results show similar values for these parameters. The comprehensive laboratory studies confirm the potential for industrial use of high mineralization water in hydraulic fracturing operations.

How to cite: Sultanov S.K., Mukhametshin V.S., Stabinskas A.P., Veliev E.F., Churakov A.V. Study of the possibility of using high mineralization water for hydraulic fracturing // Journal of Mining Institute. 2024. Vol. 270 . p. 950-962. EDN SLRNDJ
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2024-01-31
  • Date accepted
    2024-05-02
  • Date published
    2024-12-25

Evaluation of the effectiveness of water dust-suppressing emulsions based on acrylic and alkyd polymers

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Currently, the use of special dust-suppressing reagents is promising to reduce the level of dust in the vicinity and on the territories of pits, mining and processing plants and other facilities with a high content of fine dust. The analysis of ways to reduce the dust-forming ability of inorganic dispersions with a high degree of dusting is carried out. Due to the lack of regulatory and technical documentation devoted to the standardization of quality control methods for dust-suppressing compounds, it becomes necessary to analyze existing parameters and methods for their determination in order to develop mandatory methods for controlling the properties of dust-suppressing compounds, films formed by them and consolidated systems. The study is devoted to substantiating the necessary methods for assessing the dust-forming ability of inorganic dispersions after treatment with various dust suppressants and evaluating their effectiveness. The parameters are considered and methods for quantifying the determination of the quality of the consolidated layer of dust samples using different dust-suppressing compositions are described. As a result of the analysis of the set of parameter values, it was found that the most resistant to the effects of negative factors due to the formation of a denser and more durable polymer matrix mesh are dusting surface samples treated with an emulsion of alkyd glypthalic resin on a water basis with a high agglomerating effect on particles of inorganic dispersion and the formation of a consolidated layer with a wetting angle of 92.5° and a compressive strength 0.56 MPa.

How to cite: Strokova V.V., Ryazanova A.Y., Markova I.Y., Stepanenko M.A., Ishmukhametov E.M. Evaluation of the effectiveness of water dust-suppressing emulsions based on acrylic and alkyd polymers // Journal of Mining Institute. 2024. Vol. 270 . p. 941-949. EDN EHHKHL
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2021-02-09
  • Date accepted
    2023-09-20
  • Date published
    2024-02-29

Analysis of experience in the use of preformed particle polymer gels in the development of high-water-cut production facilities in low-temperature oil reservoirs

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Foreign practice of oil production in high-water-cut conditions suggests using the technology of injection of preformed particle gel (PPG) suspension into injection wells. After swelling, the polymer particles become elastic and are able to penetrate through highly permeable watered intervals into the remote reservoir zone, forming a polymer “plug”. Thus far, the domestic experience of application of this technology boiled down to testing foreign compounds. We have looked into the possibilities of PPG technology application in geological and technological conditions of high-water-cut fields of Perm Krai. The paper proposes PPG reagents effective in low-temperature reservoirs (20-35 °С) and at relatively high salinity of formation water (more than 200 g/l). The world experience of PPG technology application was analyzed to identify the principal scheme of reagent injection, to establish variants of sequence of injection of PPG particles of different sizes, as well as the possibility of regulating the morphological characteristics of polymer gel particles during synthesis depending on the porosity and permeability of the reservoir. A prerequisite for the technology is the ability to remove PPG particles after treatment from the bottom-hole zone of the formation; for this purpose, tests were carried out on a breaker compound based on sodium persulfate with synergizing additives. PPG technology is effective in reservoirs with high permeability heterogeneity. Two types of high-water-cut production facilities potentially promising for PPG realization have been identified for oil fields of Perm Krai. The first type includes carbonate Tournaisian-Famennian reservoirs with pronounced macrofracturing, in which the PPGs are used for colmatation of flushed large fractures. The second type is terrigenous Visean deposits with increased oil viscosity from 5 to 100 mPa∙s and high permeability of reservoirs (> 0.5 μm2). For both types of reservoirs, areas have been selected that are promising for the implementation of PPG technology.

How to cite: Galkin S.V., Rozhkova Y.A. Analysis of experience in the use of preformed particle polymer gels in the development of high-water-cut production facilities in low-temperature oil reservoirs // Journal of Mining Institute. 2024. Vol. 265 . p. 55-64. EDN CNCFIW
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2022-09-27
  • Date accepted
    2023-04-03
  • Date published
    2023-12-25

The study of displacing ability of lignosulfonate aqueous solutions on sand packed tubes

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This paper presents the findings of laboratory studies of rheological properties and oil displacing ability of aqueous solutions of technical grade lignosulfonate done on the sand packed tube models. The solutions containing lignosulfonate can be useful as displacement agents in development of watered reservoirs with heterogeneous porosity and permeability. When used at high concentrations, technical grade lignosulfonate can achieve selective shut-off while maintaining the reservoir pressure. The oil displacement efficiency is improved by means of redistributing the flows and selective isolation of high-permeability zones. The use of such compositions allows increasing the sweep of low-permeability reservoir zones by created pressure differential and displacing the residual oil.

How to cite: Dorfman M.B., Sentemov A.А., Belozerov I.P. The study of displacing ability of lignosulfonate aqueous solutions on sand packed tubes // Journal of Mining Institute. 2023. Vol. 264 . p. 865-873. EDN DZDUVM
Modern Trends in Hydrocarbon Resources Development
  • Date submitted
    2021-09-01
  • Date accepted
    2022-10-07
  • Date published
    2022-12-29

Parameter determination of the method of directional unloading of the reservoir based on physical modelling on a true triaxial loading setup

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The article presents a theoretical and experimental substantiation of the method of directional unloading of the reservoir in fields with low-permeability reservoirs. The relevance of the article is due to the reduction of hydrocarbon resources in modern conditions and the need to create new efficient environmentally friendly technologies to develop hydrocarbon deposits with hard-to-recover reserves, primarily with low-permeability reservoirs. The results of a theoretical study of the stress-strain state in the vicinity of a well, both cased and open, are presented. They are necessary to develop programs for laboratory testing of core specimens from the studied fields. A technique for physical modelling of deformation processes in the bottomhole zone with a decrease in pressure at the well bottom in a true triaxial loading unit is described in order to determine the parameters of the process impact on the formation reservoir, leading to an increase in well productivity. The method was applied to the conditions of the low-permeability reservoir at the Verkhneviluchanskoye oil and gas condensate field in the southwest of the Republic of Sakha (Yakutia). Expe-rimental studies were carried out on a unique scientific unit for true triaxial loading, created at the IPMech RAS, the Triaxial Independent Loading Test System. The directional unloading method was adapted for the studied field, the process parameters of successful application of the method were determined: the bottomhole design, the drawdown values necessary to increase the permeability of the bottomhole formation zone.

How to cite: Karev V.I., Kovalenko Y.F., Khimulia V.V., Shevtsov N.I. Parameter determination of the method of directional unloading of the reservoir based on physical modelling on a true triaxial loading setup // Journal of Mining Institute. 2022. Vol. 258 . p. 906-914. DOI: 10.31897/PMI.2022.95
Modern Trends in Hydrocarbon Resources Development
  • Date submitted
    2021-05-13
  • Date accepted
    2022-11-28
  • Date published
    2022-12-29

Reproduction of reservoir pressure by machine learning methods and study of its influence on the cracks formation process in hydraulic fracturing

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Hydraulic fracturing is an effective way to stimulate oil production, which is currently widely used in various conditions, including complex carbonate reservoirs. In the conditions of the considered field, hydraulic fracturing leads to a significant differentiation of technological efficiency indicators, which makes it expedient to study in detail the crack formation patterns. For all affected wells, the assessment of the resulting fractures spatial orientation was performed using the developed indirect technique, the reliability of which was confirmed by geophysical methods. In the course of the analysis, it was found that in all cases the fracture is oriented in the direction of the development system element area, which is characterized by the maximum reservoir pressure. At the same time, reservoir pressure values for all wells were determined at one point in time (at the beginning of hydraulic fracturing) using machine learning methods. The reliability of the used machine learning methods is confirmed by high convergence with the actual (historical) reservoir pressures obtained during hydrodynamic studies of wells. The obtained conclusion about the influence of the formation pressure on the patterns of fracturing should be taken into account when planning hydraulic fracturing in the considered conditions.

How to cite: Filippov Е.V., Zakharov L.A., Martyushev D.A., Ponomareva I.N. Reproduction of reservoir pressure by machine learning methods and study of its influence on the cracks formation process in hydraulic fracturing // Journal of Mining Institute. 2022. Vol. 258 . p. 924-932. DOI: 10.31897/PMI.2022.103
Modern Trends in Hydrocarbon Resources Development
  • Date submitted
    2022-04-12
  • Date accepted
    2022-11-17
  • Date published
    2022-12-29

Development of technological solutions for reliable killing of wells by temporarily blocking a productive formation under ALRP conditions (on the example of the Cenomanian gas deposits)

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Modern field operation conditions are characterized by a decline in gas production due to the depletion of its reserves, a decrease in reservoir pressure, an increase in water cut, as well as due to the depreciation of the operating well stock. These problems are especially specific at the late stage of development of the Cenomanian deposits of Western Siberia fields, where the anomaly factor below 0.2 prevails, while gas-bearing formations are represented mainly by complex reservoirs with high-permeability areas. When killing such wells, the classical reduction of overbalance by reducing the density of the process fluid does not provide the necessary efficiency, which requires the search for new technical and technological solutions. In order to prevent the destruction of the reservoir and preserve its reservoir properties during repair work in wells with abnormally low reservoir pressure, AO “SevKavNIPIgaz” developed compositions of special process fluids. A quantitative description of the process of blocking the bottomhole formation zone is proposed by means of mathematical modeling of injection of a gel-forming solution into a productive horizon. The well killing technology includes three main stages of work: leveling the injectivity profile of the productive strata using three-phase foam, pumping the blocking composition and its displacement with the creation of a calculated repression. Solutions obtained on the basis of a mathematical model allow optimizing technological parameters to minimize negative consequences in the well killing process.

How to cite: Gasumov R.А., Minchenko Y.S., Gasumov E.R. Development of technological solutions for reliable killing of wells by temporarily blocking a productive formation under ALRP conditions (on the example of the Cenomanian gas deposits) // Journal of Mining Institute. 2022. Vol. 258 . p. 895-905. DOI: 10.31897/PMI.2022.99
Modern Trends in Hydrocarbon Resources Development
  • Date submitted
    2022-05-31
  • Date accepted
    2022-11-17
  • Date published
    2022-12-29

Estimation of the influence of fracture parameters uncertainty on the dynamics of technological development indicators of the Tournaisian-Famennian oil reservoir in Sukharev oil field

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Issues related to the influence of reservoir properties uncertainty on oil field development modelling are considered. To increase the reliability of geological-hydrodynamic mathematical model in the course of multivariate matching, the influence of reservoir properties uncertainty on the design technological parameters of development was estimated, and their mutual influence was determined. The optimal conditions for the development of the deposit were determined, and multivariate forecasts were made. The described approach of history matching and calculation of the forecast of technological development indicators allows to obtain a more reliable and a less subjective history match as well as to increase the reliability of long-term and short-term forecasts.

How to cite: Kochnev A.A., Kozyrev N.D., Krivoshchekov S.N. Estimation of the influence of fracture parameters uncertainty on the dynamics of technological development indicators of the Tournaisian-Famennian oil reservoir in Sukharev oil field // Journal of Mining Institute. 2022. Vol. 258 . p. 1026-1037. DOI: 10.31897/PMI.2022.102
Modern Trends in Hydrocarbon Resources Development
  • Date submitted
    2022-08-20
  • Date accepted
    2022-11-17
  • Date published
    2022-12-29

Comparison of the approaches to assessing the compressibility of the pore space

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Integral and differential approaches to determining the volumetric compression of rocks caused by changes in the stress state are considered. Changes in the volume of the pore space of rocks are analyzed with an increase in its all-round compression. Estimation of changes in the compressibility coefficients of reservoirs due to the development of fields is an urgent problem, since the spread in the values of compressibility factors reduces the adequacy of estimates of changes in the physical properties and subsidence of the earth's surface of developed fields and underground gas storages. This parameter is key in assessing the geodynamic consequences of the long-term development of hydrocarbon deposits and the operation of underground gas storage facilities. Approaches to the assessment differ in the use of cumulative (integral) or local (differential) changes in porosity with a change in effective pressure. It is shown that the coefficient of volumetric compressibility of pores calculated by the integral approach significantly exceeds its value calculated by the differential approach, which is due to the accumulative nature of pore compression with an increase in effective pressure. It is shown that the differential approach more accurately determines the value of the pore compressibility coefficient, since it takes into account in more detail the features of the change in effective pressure.

How to cite: Zhukov V.S., Kuzmin Y.O. Comparison of the approaches to assessing the compressibility of the pore space // Journal of Mining Institute. 2022. Vol. 258 . p. 1008-1017. DOI: 10.31897/PMI.2022.97
Modern Trends in Hydrocarbon Resources Development
  • Date submitted
    2022-09-15
  • Date accepted
    2022-11-17
  • Date published
    2022-12-29

Comprehensive assessment of hydraulic fracturing technology efficiency for well construction during hydrocarbon production

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The oil and gas industry has been an integral and fundamental sector of the Russian economy for the past few years. The main problems of this industry have traditionally been the deteriorating structure of oil reserves; depreciation of main assets; slowdown and decline in oil production. Recently these have been complicated by a number of new negative trends related to underinvestment, limited financial resources, deteriorating access to new equipment and technologies. The task of the research is to make a comprehensive assessment of hydraulic fracturing technology during well construction and to increase the recovery and intensification of hydrocarbons production. In this research, modeling techniques were used to assess the productivity of each fracture. Geophysical methods (seismic survey) were used to determine the geomechanical properties of the formation. Comprehensive assessment of hydraulic fracturing technology during well construction was carried out, which allowed to increase vertical permeability and unite disparate parts of the reservoir in practice, and to determine the development efficiency of the hydrocarbon field.

How to cite: Bosikov I.I., Klyuev R.V., Мayer А.V. Comprehensive assessment of hydraulic fracturing technology efficiency for well construction during hydrocarbon production // Journal of Mining Institute. 2022. Vol. 258 . p. 1018-1025. DOI: 10.31897/PMI.2022.98
Modern Trends in Hydrocarbon Resources Development
  • Date submitted
    2022-05-26
  • Date accepted
    2022-11-17
  • Date published
    2022-12-29

Renovation method of restoring well productivity using wavefields

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A stagewise theoretical substantiation of the renovation vibrowave method of influencing the near-wellbore zone of reservoir for restoring well productivity is presented. The area of treatment by the proposed method covers the reservoir with a heterogeneous permeability with fractures formed by fracking. In this method a decrease in concentration of colmatants occurs due to a change in direction of contaminants migration. Under the influence of pressure pulses, they move deep into the reservoir and disperse through the proppant pack. The results of mathematical modelling of the propagation of pressure wave and velocity wave and the calculations of particles entrainment in wave motion are presented.

How to cite: Shatalova N.V., Apasov T.K., Shatalov A.V., Grigoriev B.V. Renovation method of restoring well productivity using wavefields // Journal of Mining Institute. 2022. Vol. 258 . p. 986-997. DOI: 10.31897/PMI.2022.108
Modern Trends in Hydrocarbon Resources Development
  • Date submitted
    2022-11-06
  • Date accepted
    2022-11-29
  • Date published
    2022-12-29

Technological sovereignty of the Russian Federation fuel and energy complex

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The review to achieve technological sovereignty of the Russian fuel and energy complex (FEC) in the ongoing geopolitical situation is presented in the article. The main scope has been to identify the key technology development priorities, restrictions and internal resources to overcome these utilizing the developed by the author the innovative methodology that consists of novel approaches to calculate level of local content, digitalization, business continuity andinteractions with military-industrial complex. Some organizational changes have been proposed to intensify the development of hi-tech products for the FEC and related industries, including establishment of the state committee for science and technology and the project office of lead engineers for the critical missing technologies. Two successful examples to utilize the described in the paper methodology is presented: the first domestic hydraulic fracturing fleet and polycrystalline diamond compact cutter bit inserts.

How to cite: Zhdaneev O.V. Technological sovereignty of the Russian Federation fuel and energy complex // Journal of Mining Institute. 2022. Vol. 258 . p. 1061-1078. DOI: 10.31897/PMI.2022.107
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2021-05-27
  • Date accepted
    2022-09-06
  • Date published
    2022-11-10

Application of resonance functions in estimating the parameters of interwell zones

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It is shown that the use of force resonance leads to the effect of “shaking” the formation, followed by breaking up the film oil and involving it in the further filtration process. For the first time in oilfield geophysics, the concept of passive noise-metering method is justified for monitoring oil and gas deposit development by measuring the quality factor of the contours in the point areas of formation development channels in interwell zones. It is established that determining the depth of modulation for the reactive substitution parameter of the linear FDC chain is crucial not only for determining the parametric excitation in FDC attenuation systems, but also without attenuation in the metrological support for the analysis of petrophysical properties of rock samples from the wells. It is shown that based on the method of complex amplitudes (for formation pressure current, differential flow rates, impedance), different families of resonance curves can be plotted: displacement amplitudes (for differential flow rates on the piezocapacity of the studied formation section), velocities (amplitudes of formation pressure current) and accelerations (amplitudes of differential flow rates on the linear piezoinductivity of the FDC section). The use of predicted permeability and porosity properties of the reservoir with its continuous regulation leads to increased accuracy of isolation in each subsequent sub-cycle of new segment formation in the FDC trajectories, which contributes to a more complete development of productive hydrocarbon deposits and increases the reliability of prediction for development indicators.

How to cite: Batalov S.А., Andreev V.Е., Mukhametshin V.V., Lobankov V.М., Kuleshova L.S. Application of resonance functions in estimating the parameters of interwell zones // Journal of Mining Institute. 2022. Vol. 257 . p. 755-763. DOI: 10.31897/PMI.2022.85
Modern Trends in Hydrocarbon Resources Development
  • Date submitted
    2021-09-17
  • Date accepted
    2022-04-07
  • Date published
    2022-12-29

Technique for calculating technological parameters of non-Newtonian liquids injection into oil well during workover

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Technique for automated calculation of technological parameters for non-Newtonian liquids injection into a well during workover is presented. At the first stage the algorithm processes initial flow or viscosity curve in order to determine rheological parameters and coefficients included in equations of rheological models of non-Newtonian fluids. At the second stage, based on data from the previous stage, the program calculates well design and pump operation modes, permissible values of liquid flow rate and viscosity, to prevent possible hydraulic fracturing. Based on the results of calculations and dependencies, a decision is made on the necessity of changing the technological parameters of non-Newtonian liquid injection and/or its composition (components content, chemical base) in order to prevent the violation of the technological operation, such as unintentional formation of fractures due to hydraulic fracturing. Fracturing can lead to catastrophic absorptions and, consequently, to increased consumption of technological liquids pumped into the well during workover. Furthermore, there is an increased risk of uncontrolled gas breakthrough through highly conductive channels.

How to cite: Mardashov D.V., Bondarenko А.V., Raupov I.R. Technique for calculating technological parameters of non-Newtonian liquids injection into oil well during workover // Journal of Mining Institute. 2022. Vol. 258 . p. 881-894. DOI: 10.31897/PMI.2022.16
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2021-09-22
  • Date accepted
    2022-03-24
  • Date published
    2022-04-29

Predicting dynamic formation pressure using artificial intelligence methods

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Determining formation pressure in the well extraction zones is a key task in monitoring the development of hydrocarbon fields. Direct measurements of formation pressure require prolonged well shutdowns, resulting in underproduction and the possibility of technical problems with the subsequent start-up of wells. The impossibility of simultaneous shutdown of all wells of the pool makes it difficult to assess the real energy state of the deposit. This article presents research aimed at developing an indirect method for determining the formation pressure without shutting down the wells for investigation, which enables to determine its value at any time. As a mathematical basis, two artificial intelligence methods are used – multidimensional regression analysis and a neural network. The technique based on the construction of multiple regression equations shows sufficient performance, but high sensitivity to the input data. This technique enables to study the process of formation pressure establishment during different periods of deposit development. Its application is expedient in case of regular actual determinations of indicators used as input data. The technique based on the artificial neural network enables to reliably determine formation pressure even with a minimal set of input data and is implemented as a specially designed software product. The relevant task of continuing the research is to evaluate promising prognostic features of artificial intelligence methods for assessing the energy state of deposits in hydrocarbon extraction zones.

How to cite: Zakharov L.А., Martyushev D.А., Ponomareva I.N. Predicting dynamic formation pressure using artificial intelligence methods // Journal of Mining Institute. 2022. Vol. 253 . p. 23-32. DOI: 10.31897/PMI.2022.11
Oil and gas
  • Date submitted
    2021-08-10
  • Date accepted
    2021-12-10
  • Date published
    2021-12-27

Possibilities of accounting the fracturing of Kashiro-Vereyskian carbonate objects in planning of proppant hydraulic fracturing

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One of the effective methods of oil production intensification for heterogeneous Kashiro-Vereyskian clay-carbonate sediments of the Volga-Ural oil and gas bearing province is proppant hydraulic fracturing. Prospects of realization for this technology are considered in the article on the example of the Vereyskian development object of Moskud’inskoye field. Based on the analysis of rocks samples investigations of Vereyiskian sediments, lithological types of carbonate rocks differing in their structural features are distinguished. Tomographic investigations of rock samples were carried out, as a result of which the rock fracturing for some lithotypes was determined and studieds. Under natural geological conditions, depending on the degree of fracturing progression and technological conditions of development, these intervals may or may not be involved in well operation. When hydraulic fracturing is performed, potentially fractured areas that are not in operation can be successfully added to oil production. Based on analysis of hydrodynamic well investigations, the fracturing of the Vereyskian object of the Moskud’inskoye field was studied on the basis of the Warren-Ruth model. With the help of geological and technological indicators of development, prediction fracturing was obtained, which was used for the construction of the natural fracturing scheme. Areas of both pore and fractured reservoirs development were identified on the deposit area. As a result of statistical analysis, the influence of fracturing on efficiency of proppant hydraulic fracturing was determined. Based on the linear discriminant analysis, a statistical model for predicting the efficiency of proppant fracturing was developed. It was shown that in addition to natural fracturing, the results are most strongly influenced by specific proppant yield, formation pressure, permeability of the remote bottomhole zone and skin effect. Based on the developed model, prospective production wells of the Moskud’inskoye field are identified for proppant hydraulic fracturing.

How to cite: Votinov A.S., Seredin V.V., Kolychev I.Y., Galkin S.V. Possibilities of accounting the fracturing of Kashiro-Vereyskian carbonate objects in planning of proppant hydraulic fracturing // Journal of Mining Institute. 2021. Vol. 252 . p. 861-871. DOI: 10.31897/PMI.2021.6.8
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2021-06-24
  • Date accepted
    2021-10-18
  • Date published
    2021-12-16

Modeling the acid treatment of a polymictic reservoir

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Acid treatment of wells program is directly related to oil production efficiency. Investigations aimed at improving the efficiency of acid treatment in a terrigenous reservoir have mainly reviewed the changing and adapting the reagents to minimize bridging caused by acid-rock interaction. Under real conditions, application of new and unique acid compositions is a complex process from an organizational point of view and is therefore not widely used as compared with conventional compositions based on a mixture of hydrochloric and hydrofluoric acids. The paper is based on an approach to improve acid treatment efficiency through optimal design based on near-bottomhole zone treatment simulation. The aspects for practical application of the developed acid treatment simulator for terrigenous reservoirs based on a numerical model of hydrodynamic, physical and chemical processes in a porous medium on an unstructured PEBI-grid are described. The basic uncertainties of the model are identified and analyzed. Influence of empirical parameters within the system of equations on the calculation results and modeling of the mineralogical composition of rocks are considered. Algorithm for static modelling of near-bottomhole zone for acid treatment modelling is described, as well as an approach to optimizing the design of near-bottomhole zone treatment based on adapting the results of rock tests in the model. Using experimental data, the necessity of accounting for influence of secondary and tertiary reactions on the results of modeling physical and chemical processes during acid treatment of terrigenous reservoirs was proved. The distinctive features of West Siberian objects (polymictic reservoirs) with respect to the efficiency of near-bottomhole zone treatment with clay acid have been investigated. Series of calculations to determine the optimum volume of acid injection has been carried out. Experience of previously conducted measures under the considered conditions has been analyzed and recommendations to improve the efficiency of acid treatment have been given.

How to cite: Khasanov M.M., Maltcev A.А. Modeling the acid treatment of a polymictic reservoir // Journal of Mining Institute. 2021. Vol. 251 . p. 678-687. DOI: 10.31897/PMI.2021.5.7
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2021-04-23
  • Date accepted
    2021-09-07
  • Date published
    2021-12-16

Development of the concept of an innovative laboratory installation for the study of dust-forming surfaces

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Currently, the determination of the emission rate of suspended solids from a unit of the surface area of a man-made mass at various parameters of the wind flow is not sufficiently described. The analysis of the world experience of researchers shows that existing laboratory installations have various design features that do not allow to correctly determine the mass of the dust being flapped and wind-blown. Based on the analysis results, the concept of an innovative laboratory installation for the study of dust-forming surfaces has been developed. It takes into account the influence of wind shadows, the deturbulization of an artificially created air flow, the possibility of regulating not only the flow velocity mode, but also the creation of a vacuum or disturbance in the area of sample placement, as well as the formation of a certain angle of wind flow attack relative to the surface. The concept provides for the possibility of determining the volume of dust emissions by the values of the lost dust masses in the sample and by the values of dust concentrations in the outgoing stream. The calculation of the main basic elements of the installation using the ANSYS FLUENT software package was carried out. The model and configuration of the wind tunnel have been developed and calculated, the main geometric parameters and functional elements for the possibility of use in scientific work have been determined. For practical use of the empirical roughness value of the underlying surface, its values are recommended in a wide range – from zero for the water surface to 0.44 for large cities with tall buildings and skyscrapers.

How to cite: Ivanov A.V., Smirnov Y.D., Chupin S.A. Development of the concept of an innovative laboratory installation for the study of dust-forming surfaces // Journal of Mining Institute. 2021. Vol. 251 . p. 757-766. DOI: 10.31897/PMI.2021.5.15
Oil and gas
  • Date submitted
    2021-04-26
  • Date accepted
    2021-07-27
  • Date published
    2021-10-21

Study of the dynamics for gas accumulation in the annulus of production wells

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Accumulation of associated petroleum gas in the annulus is one of the negative factors that impede the intensification of mechanized oil production. An increase in annular gas pressure causes growth of bottomhole pressure, a decrease in back pressure to the formation and the inflow of formation fluid. In addition, accumulation of gas in the annulus leads to displacement and a decrease in the liquid level above the submersible pump. Insufficient level of the pump submersion (rod or electric submersible) causes a number of complications in the operation of mechanized production units associated with overheating of the elements in pumping units. Therefore, the development of technologies for optimizing the gas pressure in the annulus is relevant. Method for calculating the intensity of gas pressure increase in the annulus of production wells operated by submersible pumps has been developed. Analytical dependence for calculating the time interval of gas accumulation in the annulus, during which the dynamic level decreases to the pump intake, is obtained. This value can be used to estimate the frequency of gas withdrawal from the annulus using compressors. It has been found that the rate of increase in annular gas pressure in time increases non-linearly with a rise in the gas-oil ratio and a decrease in water cut, and also linearly increases with a rise in liquid flow rate. Influence of the operating (gas-oil ratio) and technological (value of the gas pressure maintained in the annulus) factors on the flow rate of the suspended reciprocating compressor driven by the beam engine, designed for forced withdrawal and redirection of the annular gas into the flow line of the well is analyzed.

How to cite: Urazakov K.R., Belozerov V.V., Latypov B.M. Study of the dynamics for gas accumulation in the annulus of production wells // Journal of Mining Institute. 2021. Vol. 250 . p. 606-614. DOI: 10.31897/PMI.2021.4.14
Oil and gas
  • Date submitted
    2021-02-09
  • Date accepted
    2021-07-27
  • Date published
    2021-10-21

Development of an algorithm for determining the technological parameters of acid composition injection during treatment of the near-bottomhole zone, taking into account economic efficiency

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Relevance of the research is due to the low proportion of successful hydrochloric acid treatments of near-bottomhole zones of carbonate reservoirs in the Perm region caused by insufficiently careful design and implementation of measures to stimulate oil production. Within the framework of this article, the development of a program is presented, which is based on an algorithm that allows determining the volume and rate of injection for an acid composition into a productive formation corresponding to the maximum economic efficiency during hydrochloric acid treatment. Essence of the proposed algorithm is to find the greatest profit from measures to increase oil recovery, depending on the cost of its implementation and income from additionally produced oil. Operation of the algorithm is carried out on the principle of enumerating the values ​​of the volume and rate of injection for the acid composition and their fixation when the maximum difference between income and costs, corresponding to the given technological parameters of injection, is reached. The methodology is based on Dupuis's investigations on the filtration of fluids in the formation and the results of the experiments by Duckord and Lenormand on the study of changes in the additional filtration resistance in the near-well zone of the formation when it is treated with an acid composition. When analyzing and including these investigations into the algorithm, it is noted that the developed technique takes into account a large number of factors, including the lithological and mineralogical composition of rocks, technological parameters of the injection of a working agent and its properties, well design, filtration properties of the formation, properties of well products. The article provides an algorithm that can be implemented without difficulty using any programming language, for example, Pascal. Selection of the optimal values ​​for the volume and rate of injection is presented in this paper, using the example of a production well at the Chaikinskoye oil field, located within the Perm region. Introduction of the developed algorithm into the practice of petroleum engineering will allow competent and effective approach to the design of hydrochloric acid treatments in carbonate reservoirs without a significant investment of time and additional funds.

How to cite: Krivoshchekov S.N., Kochnev A.A., Ravelev K.A. Development of an algorithm for determining the technological parameters of acid composition injection during treatment of the near-bottomhole zone, taking into account economic efficiency // Journal of Mining Institute. 2021. Vol. 250 . p. 587-595. DOI: 10.31897/PMI.2021.4.12
Geology
  • Date submitted
    2020-05-28
  • Date accepted
    2021-07-27
  • Date published
    2021-10-21

On the applicability of electromagnetic monitoring of hydraulic fracturing

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The purpose of this work is to assess the possibilities of using electromagnetic monitoring to study the development of a fracture system generated by hydraulic fracturing (HF) with a specified position of the controlled source. The option with the source (a vertical electric dipole) located in the interval of the oil-bearing formation and ground-based measurements was chosen as the most promising monitoring plan. We have built a geoelectric model equivalent to the system of hydraulic fractures, divided into 11 zones corresponding to HF stages. For the selected model, mathematical simulation was performed by solving the direct problem considering the impact of the steel casing, the presence of which reduced the effect. Despite this fact, no strong distortion of electromagnetic field anomaly was observed above the HF zone. Analysis of the simulation results at different HF stages showed that as new hydraulic fractures appeared and were filled with electrically conductive proppant, the total effect increased. The data on electric field anomaly demonstrated maximum deviation from the background level of more than 2 %. Provided that the studied formation is characterized by sufficient electrical conductivity, its magnetic field also becomes informative.

How to cite: Grigorev G.S., Salishchev M.V., Senchina N.P. On the applicability of electromagnetic monitoring of hydraulic fracturing // Journal of Mining Institute. 2021. Vol. 250 . p. 492-500. DOI: 10.31897/PMI.2021.4.2
Oil and gas
  • Date submitted
    2020-06-16
  • Date accepted
    2020-11-09
  • Date published
    2020-12-29

Investigation of probabilistic models for forecasting the efficiency of proppant hydraulic fracturing technology

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To solve the problems accompanying the development of forecasting methods, a probabilistic method of data analysis is proposed. Using a carbonate object as an example, the application of a probabilistic technique for predicting the effectiveness of proppant hydraulic fracturing (HF) technology is considered. Forecast of the increase in the oil production of wells was made using probabilistic analysis of geological and technological data in different periods of HF implementation. With the help of this method, the dimensional indicators were transferred into a single probabilistic space, which allowed performing a comparison and construct individual probabilistic models. An assessment of the influence degree for each indicator on the HF efficiency was carried out. Probabilistic analysis of indicators in different periods of HF implementation allowed identifying universal statistically significant dependencies. These dependencies do not change their parameters and can be used for forecasting in different periods of time. Criteria for the application of HF technology on a carbonate object have been determined. Using individual probabilistic models, integrated indicators were calculated, on the basis of which regression equations were constructed. Equations were used to predict the HF efficiency on forecast samples of wells. For each of the samples, correlation coefficients were calculated. Forecast results correlate well with the actual increase (values ​​of the correlation coefficient r = 0.58-0.67 for the examined samples). Probabilistic method, unlike others, is simple and transparent. With its use and with careful selection of wells for the application of HF technology, the probability of obtaining high efficiency increases significantly.

How to cite: Galkin V.I., Koltyrin A.N. Investigation of probabilistic models for forecasting the efficiency of proppant hydraulic fracturing technology // Journal of Mining Institute. 2020. Vol. 246 . p. 650-659. DOI: 10.31897/PMI.2020.6.7