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

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.

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

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.

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

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.

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

Offshore Arctic hydrocarbon deposits. The Architecture’s 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

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.

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

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).

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

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 1–2 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.

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

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.

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

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.

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

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.

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

Clay rocks influence in the section of production formation on the liquid production decline rates in low permeability reservoirs

Kardopoltseva A.M., Shtinov V.A., Davletbaev A.Ya., Minibaev M.R., Asalkhuzina G.F., Trofimov V.E., Shchutsky G.A., Miroshnichenko V.P.

DOI: 10.24412/2076-6785-2023-1-56-60

This article is devoted to the study of geomechanic and porosity clays properties influence on the processes of pressure redistribution and fluid filtration in the well drainage area, and as a result, on well productivity. Comparison of the calculation results showed a significant effect of clay interlayers in the reservoir section on the performance and productivity of the well.

Materials and methods
The study was carried out by creating synthetic hydrodynamic models with a different number of clay interlayers in the section of the productive formation, while maintaining the volume ratio between sandstone and clay in the ratio of 50:50. The Arps and Fetkovich methods were used to analyze decline curve anaysis production and calculate predicted values of cumulative production in the area of well drainage, assess and compare the rate of change in fluid production in wells.

clay rocks, pore space compressibility, reservoir properties, reservoir modeling, decline curve analysis, Arps method, Fetkovich method

Evaluation of the applicability of gas methods of enhanced oil recovery for the development of tight oil of fields-analogues of the Achimov formation

Kobyashev A.V., Arkhipov V.N., Zakharenko V.A., Dubrovin A.V., Starikov M.A.

DOI: 10.24412/2076-6785-2023-1-46-53

The paper considers an approach to the development of deposits of tight oil, characterized by a complex geological structure, ultra-low permeability (less than 1 mD) and saturation differentiation. The use of standard approaches and development technologies for such complex reservoirs makes it difficult to obtain high efficiency of oil recovery. In order to choose the optimal development technology, the applicability of gas methods
for enhanced oil recovery was evaluated using analytical techniques and calculations based on a compositional flow model.

Materials and Methods
The paper gives the numerical estimations of the Minimum Miscibility Pressure (MMP) of oil and various gas agents (APG, CO2, methane) made via correlations and EOS matched to standard studies
of downhole samples. A preliminary feasibility study of various development options for the reservoir in question (water and gas injection) was performed on a sector composite flow simulation model.

tight oil, low permeability, hydraulic fracturing, pilot works, technology testing, gas methods of enhanced oil recovery

The influence of the hysteresis relative permeability on the numerical estimate of the effectiveness of water-alternating-gas injection

Kobyashev A.V., Pyatkov A.A., Dubrovin A.V., Zakharenko V.A.

DOI: 10.24412/2076-6785-2023-1-41-45

The work is devoted to the study of the effect of the hysteresis of relative permeability on the numerical evaluation of the effectiveness of water-alternating-gas (WAG) effects on models of various scales: a one-dimensional model of the core column (evaluation of the effect of the hysteresis of the core column on the quality of model adaptation to the results of flow experiments on core columns in the absence of gravity), a two-dimensional synthetic model of two wells (evaluation of the effect of hysteresis relative permeability for the amount of additional oil production in the presence of gravity), three-dimensional full-scale model of the deposit (evaluation of the effect of the hysteresis relative permeability on the efficiency of the WAG).

Materials and methods
Materials: results of core experiments on oil displacement by gas and water fringes. Methods: numerical simulation using the Eclipse 300 hydrodynamic simulator.

hysteresis relative permeability, oil and gas miscibility, efficiently of WAG

Àutonomous inflow control devices usage experience

Ziuzev E.S., Davydov A.A., Oparin I.A., Malofeev M.V., Kornilov E.Y.

DOI: 10.24412/2076-6785-2023-1-36-40

Currently, in the Eastern Siberia oil fields, in the conditions of infrastructural restrictions, the simultaneously produced gas utilization problem, as well as breakthrough of gas caps extracted during the oil rims development, is acute. One of the ways to limit gas production during the oil rims development is the autonomous monitoring devices (AICD) usage at the completion of the well. At the Srednebotuobinskoye field, located in Eastern Siberia, successful work was carried out on the autonomous inflow control devices usage and full-scale replication began as part of the thin oil rim development of the Botuobin horizon.

Materials and methods
As part of the pilot project, 4 wells with AICD were implemented. Based on the results, full-scale replication has begun. For the completion design, a tool has been developed for arranging the amount of AICD
in each segment of the well, depending on the geological and technological conditions.

autonomous inflow control device, AICD, cone formation, gas breakthrough, gas factor, accumulated oil production, Eastern Siberia, Botuobinsky horizon

Optimization of the well completion methods for low permeability gas reservoir turonian

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

DOI: 10.24412/2076-6785-2022-3-48-52

An integrated approach has been formed to justify the designs of planned gas wells, taking into account the accumulated experience in the formation of a strategy and technology for the development of the turonian stage. A decision matrix has been created for choosing the optimal well completion method depending on saturation (pure gas and water gas zones) and reservoir properties (in particular Kh). An express assessment has been developed for choosing a well completion method for poorly explored and undrilled zones.

Materials and methods
By forming and performing many calculations on sector hydrodynamic models depending on saturation (pure gas and water gas zones) and reservoir properties (in particular Kh), individual well designs, the number of stages of hydraulic fracturing and tonnage proppant are recommended for each of the typical zones of the productive formation
according to the created decision matrix.

turonian stage, reservoir saturation zones, reservoir conduction zones, sector hydrodynamic models, well completion methods

Assessment of polymer adsorption for the conditions of Russian field PK formations

Lapin K.G., Toropov K.V., Volgin E.R., Byazrov R.R., Galimov V.V., Lagutina M.A.

DOI: 10.24412/2076-6785-2022-2-60-64

The increase in the share of hard-to-recover reserves makes it relevant to introduce physico-chemical methods of increasing oil recovery. Polymer flooding is a promising method. One of the factors influencing the success of this technology is the retention (adsorption) of the polymer in a porous medium. At a high value of adsorption, there is an intense loss of viscosity of the injected composition, colmatation of the downhole region of the formation is possible. It is necessary to select compositions characterized by acceptable retention values in the reservoir of a particular deposit. The article provides an example of the assessment of adsorption, including the influence of various factors on its magnitude.

Materials and methods
Laboratory tests were carried out according to the guidelines of the Institute “Hyprovostokneft” [14] and of the American Petroleum Institute [15]. All stages of preparation of reservoir models and fluids for research are based on OST 39-195-86 “Oil. Method for determining the oil displacement coefficient by water in laboratory conditions”.

adsorption, concentration, polymer, temperature

Study of the effect of a bimetallic catalyst based on iron and cobalt on the aquathermolysis process under thermal steam treatment of high-viscosity oil

Baygildin E.R., Sitnov S.A., Vakhin A.V., Nurgaliev D.K.

DOI: 10.24412/2076-6785-2021-5-46-51

In this work, we studied the effect of bimetallic catalysts formed in situ from mixtures of oil-soluble iron and cobalt precursors in the process of aquathermolysis of heavy oil from the Ashalchinsky field. Based on the results of determining the group composition (SARA analysis) and viscosity-temperature characteristics, an improvement in the composition and an increase in the mobility of oil under the action of steam and a bimetallic catalyst is shown. It was found that the catalyst intensifies the destructive processes of resinous compounds, provokes the enrichment of the destruction products of the latter in the saturated and aromatic fractions with high molecular weight n-alkanes and polycyclic hydrocarbons, respectively. It was revealed that the proposed catalyst of the optimal composition is a mixture of individual and mixed oxides and sulfides of iron and cobalt (ferrospinels). Catalyst can be used at the Ashalchinsky field of heavy oil in conditions close to reservoir conditions (200 °C, 10 bar), as a reagent providing an increase in the degree of oil recovery.

Materials and methods
Heavy oil of the Ashalchinsky field of the Republic of Tatarstan, SARAanalysis, viscometry, gas chromatography-mass spectrometry (GC-MS), catalyst active form, XRD.

heavy oil, steam treatment, bimetallic catalyst, oil-soluble precursors, catalyst active form, in-situ upgrading, EOR

Revealing the direction of natural fracturing and cavernousness in order to optimize the field development parameters

Ponomarev M.D., Borkhovich S.Yu. , Mavliev A.R., Polozov M.B., Trubitsyna N.G.

DOI: 10.24412/2076-6785-2021-5-42-44

This article evaluates the study of the direction of spread of natural fracturing and predominant direction of propagation of cavernousness of the carbonate reservoir of the Podol-Kashiro-Vereiskian object of the Elnikovskoye oil field. The studies are based on the analysis of information on the sampled core, tracer studies, the FMI method and the mutual influence of production/injection wells. The study identified the main directions of natural fractures and vugginess. These parameters must be taken for well coverage, in particular, adjusting the location of production/injection wells in order to prevent anticipatory water invasion, as well as when selecting candidates for geological and technical measures to increase the
final oil recovery factor.

Materials and methods
Based on the analysis of practical material on optimizing the conditions of the fields being developed in the territory of the Udmurt Republic.

natural fractures, natural vugginess, development, oil field, carbonate reservoir rock, geological and technical actions, interference of wells

The experience of oil recovery using nonionic surfactants

Kozhin V.N., Gorodnov V.P., Kalinin E.S., Ryskin A.Y., Chernov E.N.

DOI: 10.24412/2076-6785-2021-4-46-52

Nonionic surfactants provide benefits of possibility of large-scale production for oil industry demands. However, the laboratory and field tests
show their inferiority to anionic surfactants due to propensity for salting out when the reservoir temperature is higher than the cloud point of
the repressuring solution containing the nonionic surfactant. This paper describes the results of a field test of water solutions of alkylphenol
ethoxylates from different manufacturers, both with and without polyacrylamide, compared to the previous field tests of these reagents.
The innovative technologies for use of nonionic surfactants are based on their thermal salting out from the water solution and on the polyacrylamide
complex formation possessing high selectivity when moving in the reservoir, i.e. poor filtration into the watered and good filtration into the oilsaturated

Materials and methods
Materials: data on the field test of nonionic surfactants as a reagent
for improving reservoir oil recovery in Western Siberia and Urals-Volga
Methods: analysis of the results obtained when testing variety of technologies based on using aqueous nonionic surfactant solutions in
the oil fields of Western Siberia and Urals-Volga regions.

nonionic surfactant, improving reservoir recovery, field tests

Seismogeological analysis as a tool of history matching: YNAO Case Study

Gorlanov A.A., Vorontsov D.Y., Schetinin A.S., Aksenov A.I., Ovchinnikova D.G.

DOI: 10.24412/2076-6785-2021-3-34-40

The process of raising the gas-water contact (GWC) is inevitable during development of the reservoir. This leads to flodding of wells and reducing of daily gas production. Horizontal sidetracks and new horizontal drilling allows to maintain production at the required level. Mostly, the direction of the horizontal section of the well determines its efficiency. In difficult geological conditions, a detailed analysis of seismic data in the drilling area allows to reduce drilling risks and achieve planned starting rates. Accounting of seismic data in geological models is often limited by a low correlation coefficient between reservoir properties obtained from wells and seismic attributes. Simulation models use seismic data based on the assumptions made by the geological engineers.

Materials and methods
In this paper authors uses a iterative approach to geological modeling: implementations include in-depth analysis of seismic data and well performance dynamics. Modern software modules were used to automatically check the compliance of the geological implementation with the development history, as well as to assess the uncertainties. High correlation coefficients between well water cut and seismic attributes obtained. Authors developed a method for determining the presence of shale bodies and “confluence windows” of a massive gas reservoir with water-saturated volumes.

geological modeling, simulation run, Pokurskaya suite, gas reservoir, cenomanian, horizontal wells, attribute analysis

The selection approach for the efficient development method gas-and-oil fields based on multialternative calculations

Potapov K.R., Polozov M.B., Trubicyna N.G., Borkhovich S.Yu.

DOI: 10.24412/2076-6785-2021-3-29-32

The article describes the selection approach for the efficient development method of the vereiskian formation of the Chutyr field. To optimize the method, the filtration model of the vereiskian and bashkirian formations was prepared and historically matched. Based on multialternative calculations, the practical field development method was determined.

Materials and methods
Based on the analysis of practical material, the testing of the method of foam acid exposure in the conditions of developed fields in the territory of the Udmurt Republic.

efficient system, development method, gas and oil field, filtration model, fluid flow model, multialternative calculations, modelling