ISSN 0207-2351

Scientific-technical journal

OILFIELD ENGINEERING

                                                                                                    published since 1965

November 2021                     ¹ 11 (635)                      12 issues per year

 

CONTENÒS

 

GEOLOGICAL MODELING

 

Podosenov A.E., Ladeyshchikov S.V., Azanova N.O., Soloveva M.A. Forecast of the geological structure based on the multivariate model of the Rostovitskoe oil field (p. 5‑13)

 

Sannikov I.N., Litvintseva E.V. Application of probabilistic reservoir simulation models for quantitative risks assessment and projects value assurance (p. 14‑19)

 

DRILLING TECHNIQUE AND TECHNOLOGY

 

Andreev K.V., Shadchnev R.A, Butakova N.A., Krivosheeva N.N., Bunin D.Yu., Mavrin A.M., Merkurieva A.G. RBS-3 Russian reagent used for drilling mud filter cake decomposition in bottom-hole zone of the Caspian offshore wells pay zones (p. 20‑25)

 

Shmelev V.A. principles and approaches to creation of automated control systems during drilling of oil and gas wells (p. 26‑33)

 

RESEARCH OF FORMATIONS AND WELLS

 

Mikitin E.O., Matyukhina T.A., Mett D.A. Approaches to monitoring the process of liquid hydrocarbons generation, recovered from kerogen-containing rocks under commercial conditions (p. 34‑39)

 

DEVELOPMENT OF OIL AND GAS-OIL FIELDS

 

Modla D.M., Tonkonogova M.G., Sheffing A.A., Poshibaev V.V., Dvirnyak K.N. Design of development of a deposit with a high lateral inhomogeneity at the stage of geological exploration works (p. 40‑45)

 

Abdulin I.K., Yudchits V.V., Mayer A.V., Valeev M.D. Assessment of the prospects of application of the technology of hydrocarbons’ simultaneous separate production when developing multi-layer oil deposits in the Western Siberia oil fields (p. 46‑48)

 

METHODS OF PRODUCING EFFECT ON A DEPOSIT AND RAISING OIL RECOVERY

 

Kladova A.V., Uzyarkina E.G. Regulation of rheological properties of cross-linked polymer systems depending on polyacrylamide concentration and formation temperature (p. 49‑53)

 

Lesina N.V., Kashnikov K.A., Usachev G.A., Shchekoldin K.A., Malaniy S.Ya., Tsvetkov S.V. Definition of optimal parameters and efficiency analysis of cyclic steam stimulation at terrigenous reservoirs of high-viscosity oil fields in the Samara region (p. 54‑58)

 

Loparev D.S., Deminskaya N.G., Fadeev À.G., Levin À.V. Application of mathematical statistics methods for development of measures to improve the operational reliability of wells when using thermal methods of oil recovery (p. 59‑65)

 

TECHNIQUE AND TECHNOLOGY OF OIL PRODUCTION

 

Bakirov D.L., Fattakhov M.M., Gritsay G.N., Patrushev D.Ya., Antonov V.V., Shiriev A.K., Shurupov A.M., Fatikhov V.V. Improvement of technical means for completion of horizontal wells (p. 66‑70)

 

Kordik K.E., Abdulin I.K., Zabrodin O.Yu., Shlyapchinsky A.V., Zipir V.G., Leontiev S.A. On complications when operating gas-condensate wells of the pyakyakhinskoe field related to the appearance of liquid "plugs" at the bottomhole (p. 71‑74)

 

Kladova A.V., Shamsutdinova E.V. Analysis of the deposits composition from the borehole equipment (p. 75‑78)

 

Kharin S.S., Kardyshev M.N., Nekrasova I.L., Khvoshchin P.A., Garshina O.V., Frankov D.V. Experience of drilling wells in the intervals of highly swelling "reactive" clays on the example of the Denisovsky license area (p. 79‑84)

 

Mett D.A., Privoznova A.E., Nikolaeva T.N., Sobaeva E.V. An example of optimization of location of boreholes in the upper jurassic sediments of the Sredne-Nazymskiy deposit in the Western Siberia (p. 85‑91)

 

 

Information on the articles

 

UDC 622.276.1/.4.001.57          DOI: 10.33285/0207-2351-2021-11(635)-5-13

 

FORECAST OF THE GEOLOGICAL STRUCTURE BASED ON THE MULTIVARIATE MODEL
OF THE ROSTOVITSKOE OIL FIELD (p. 5)

 

Artem Evgenievich Podosenov

Sergey Viktorovich Ladeyshchikov,

Nataliya Olegovna Azanova,

Mariya Andreevna Soloveva

 

LUKOIL−Engineering Limited PermNIPIneft Branch Office in Perm

Perm, Russian Federation,

e-mail: Artem.Podosyonov@pnn.lukoil.com

 

The objectives of this work are identification of the risks of the geological structure non-confirmation when drilling wells, reduction of the geological basis uncertainties, as well as to improvement of the methods of geological models building.

In the course of achieving the set goals, the following tasks were solved:

• substantiation of approaches to multivariate geological modeling;

• identification of key uncertainties affecting the value of initial geological reserves;

• probabilistic assessment of geological risks based on a multivariate model.

Multivariate geological modeling and probabilistic estimation of initial geological oil reserves were performed using the RMS Uncertainty module of IRAP RMS. The following parameters were varied: the positions of the reference horizons and fluid contact levels as well as settings of the lithological-facies modeling associated with the probability of the channel presence and the settings of the variograms.

The results of the work are as follows:

• an ensemble of 150 realizations for each layer obtained by varying a given set of uncertainties;

• probabilistic estimation of reserves and obtaining the values of the initial geological oil reserves according to the variants P10, P50 and P90;

• forecast of geological structure at the points of design wells laying;

• an improved approach to a geological model building, which allows increase of the accuracy of geological structure forecasts and uncertainties reduction;

• recommendations for reducing the risks of the geological structure non-confirmation, as well as for further exploration of the field.

Thus, it is necessary to take into account the uncertainties of calculating reserves at different stages of a field development in order to reduce the risks arising at these stages. The main uncertainties at all stages of a field development are related to geological parameters and the calculation of reserves. Risk analysis at the inventory calculation stage reduces the costs of the project as a whole.

 

Keywords: multivariate modeling; geological modeling; uncertainty; probabilistic estimation; forecast.

 

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UDC 622.279.04:621.311.001.57          DOI: 10.33285/0207-2351-2021-11(635)-14-19

 

APPLICATION OF PROBABILISTIC RESERVOIR SIMULATION MODELS FOR QUANTITATIVE RISKS
ASSESSMENT AND PROJECTS VALUE ASSURANCE (p. 14)

 

Ivan Nikolaevich Sannikov, Cand. of phys.-math. sci.,

Elizaveta Vladimirovna Litvintseva

 

LLC "LUKOIL–Engineering"

Moscow, Russian Federation,

e-mail: Ivan.Sannikov@lukoil.com, Elizaveta.Litvintseva@lukoil.com

 

Accounting for geological and technological uncertainties and risks is required while production forecasting and making decisions about project economic efficiency. In this way, application of probabilistic modeling for Greenfields is a reliable tool for such purpose. The paper describes an approach to preparing an ensemble of realizations of a probabilistic reservoir simulation model of the offshore gas condensate field in the Caspian region and presents the main results, including cumulative curves of the probability of achieving technological indicators. As a tool for sensitivity analysis of production data, the "Tornado" experiment was performed. In the paper, according to the results of the probabilistic geological-technological modeling, the key uncertainties were identified in the field of geology and development and an approach to the formation of a multivariate assessment of the production forecast data for making investment decisions are presented.

 

Keywords: probabilistic modeling; geological uncertainties; risks; field development; reservoir and production engineering; Monte-Carlo method; "Latin hypercube" experiment; "Tornado" computational experiment, investment decision

 

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UDC 622.24.063(262.81)          DOI: 10.33285/0207-2351-2021-11(635)-20-25

 

RBS-3 IS A RUSSIAN REAGENT FOR DRILLING MUD FILTER CAKE DECOMPOSITION
IN BOTTOM-HOLE AREA OF THE CASPIAN OFFSHORE WELLS PAY ZONES (p. 20)

 

Konstantin Vladimirovich Andreev,

Roman Aleksandrovich Shadchnev,

Natalia Aleksandrovna Butakova,

Natalia Nikolaevna Krivosheeva,

Denis Yurievich Bunin

 

LUKOIL–Engineering Limited PermNIPIneft Branch Office in Perm

Volgograd, Russian Federation,

e-mail: Konstantin.V.Andreev@lukoil.com, Roman.Shadchnev@lukoil.com, Natalya.Butakova@lukoil.com, Natalya.N.Krivosheeva@lukoil.com, Denis.Bunin@lukoil.com

 

Alexander Mikhailovich Mavrin,

Anastasiya Gennadievna Merkurieva

 

LUKOIL–Engineering LLC

Moscow, Russian Federation,

e-mail: Aleksandr.Mavrin@lukoil.com, Anastasiya.Ivko@lukoil.com

 

 

The North Caspian fields, developed by horizontal wells, face the problem of colmatation of bottom-hole zones of production formations by MEGADRIL mud filter oil-based cake, containing deposits of barite (barium sulfate), the solution requires improvement of mud displacement technology. RBS-3 reagent (produced by LLC Multifunctional Company "ChemServiceEngineering") is proposed for a formation bottom-hole zone cleaning as a result of barite dissolvation and filter cake removal. RBS-3 reagent function is based on transformation of insoluble barium salts into chelates which are easy to remove from bottom-hole area. Detergents in RBS-3 formulation promote mud filter cake dispergation. Results of laboratory core-level formation damage tests of RBS-3 mud filter cake removal efficiency are presented in the paper as well as rheological tests of thickened RBS-3 and NaCl solutions. Optimal ratio of DuoVis and FloTrol thickening components is established. Drilling mud displacement procedure with the use of RBS-3 reagent was first developed and first tested for North Caspian well.

 

Keywords: North Caspian; offshore field; oil-based mud MEGADRIL; filter cake; barite; RBS-3 reagent; chelates; drilling mud displacement technology; bottom-hole area; permeability recovery factor.

 

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UDC 622.24.05:681.5          DOI: 10.33285/0207-2351-2021-11(635)-26-33

 

PRINCIPLES AND APPROACHES TO CREATION OF AUTOMATED CONTROL SYSTEMS
DURING DRILLING OF OIL AND GAS WELLS (p. 26)

 

Valery Aleksandrovich Shmelev

 

LUKOIL−Engineering Limited PermNIPIneft Branch Office in Perm

Volgograd, Russian Federation,

e-mail: Valery.Shmelev@lukoil.com

 

Improving the efficiency of drilling operations is largely associated with one of the most important trends - the drilling process optimization. The complexity of the process, due to a large number of technological variables, information flow of data, uncertainty of geological conditions, the influence of random factors, determines the features of the process control in the automatic mode.

The paper presents the main design types of automation tools used at oil and gas fields to control the drilling process parameters in accordance with local criteria for optimizing the target functions of the process (speed, cost, penetration, etc.). The principles of automatic process control, implemented both on the basis of traditional crisp approaches and based on fuzzy logic and artificial neural networks are considered.

 

Keywords: drilling process; parameters of the object of regulation; optimal control criteria; automatic control system; operating parameters; automatic stabilizers; well drilling management.

 

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UDC 622.276.654          DOI: 10.33285/0207-2351-2021-11(635)-34-39

 

APPROACHES TO MONITORING THE PROCESS OF LIQUID HYDROCARBONS
GENERATION, RECOVERED FROM KEROGEN-CONTAINING ROCKS
UNDER COMMERCIAL CONDITIONS (p. 34)

 

Evgeny Orestovich Mikitin,

Tatiana Aleksandrovna Matyukhina

Dmitry Aleksandrovich Mett, Cand. of tech. sci.

 

LLC "LUKOIL–Engineering"

Moscow, Russian Federation,

e-mail: Tatyana.Matyukhina@lukoil.com

 

One of the applied technologies aimed at involving of hard-to-recover reserves in the development contained in the Upper Jurassic bituminous formation of the Western Siberia is thermal gas treatment (TGT). During the course of a field experiment at the Sredne-Nazymskoye field in order to monitor the development and to increase oil recovery, the task of assessing the share of synthetic oil, which is formed as a result of kerogen thermal destruction, when using TGT, in the total production of wells, becomes urgent.

The paper shows that the portion of synthetic oil in a production well can be estimated on the basis of comprehensive geochemical studies. Compositions of native (initial) oil, synthetic oil obtained experimentally as a result of kerogen pyrolysis, and their mixtures in different proportions were studied by applying the methods of gas chromatography and gas chromatography-mass spectrometry. To assess the impurity of synthetic oil, the most informative molecular parameters related to indicators of the degree of its catagenetic maturity have been determined. Palette curves were built that allow identifying the portion of synthetic oil exceeding 15 % of the total volume of oil produced by the well.

 

Keywords: thermal gas treatment; development monitoring; gas chromatography; synthetic oil.

 

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UDC 622.276.1/.4.038          DOI: 10.33285/0207-2351-2021-11(635)-40-45

 

DESIGN OF DEVELOPMENT OF A DEPOSIT WITH A HIGH LATERAL INHOMOGENEITY
AT THE STAGE OF GEOLOGICAL EXPLORATION WORKS (p. 40)

 

Daniil Miroslavovich Modla,

Mariya Gennadievna Tonkonogova,

Alexey Aleksandrovich Sheffing,

Vladimir Vladimirovich Poshibaev,

Karina Nikolaevna Dvirnyak

 

LUKOIL–Engineering LLC

Moscow, Russian Federation,

e-mail: Daniil.Modla@lukoil.com

 

The article discusses the experience of designing a field in the Middle East in terms of justifying the development system for the facies zones identified according to geological criteria (Reef, Rear Trail and Lagoon), which are characterized by significantly different reservoir properties, but are a single development object in the conditions of a lithologically isolated water-drive reservoir. The field has a low elastic reserve. The Reef Zone is represented by the best reservoir properties with a gradual deterioration of properties towards lagoon deposits. In the course of the work performed, all available geological and field data were summarized, approaches to introducing the analysis results into geological and technological models were found or improved. The results of the work were accepted for further design of the field development system and the assessment of economic indicators.

 

Keywords: field design; collector properties; facies zones; lateral heterogeneity.

 

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UDC [622.276.5+628.112.2]"72"          DOI: 10.33285/0207-2351-2021-11(635)-46-48

 

ASSESSMENT OF THE PROSPECTS OF APPLICATION OF THE TECHNOLOGY
OF HYDROCARBONS’ SIMULTANEOUS SEPARATE PRODUCTION
WHEN DEVELOPING MULTI-LAYER OIL DEPOSITS
IN THE WESTERN SIBERIA OIL FIELDS (p. 46)

 

Ilnur Kamilevich Abdulin,

Vitaly Viktorovich Yudchits

 

LUKOIL–Engineering Limited KogalymNIPIneft Branch Office in Tyumen

Tyumen, Russian Federation,

e-mail: AbdulinIK@tmn.lukoil.com, YudchitsVV@tmn.lukoil.com

 

Andrey Vladimirovich Mayer, Cand. of tech. sci.

 

National University of Oil and Gas "Gubkin University"

Moscow, Russian Federation,

e-mail: mayer-14@mail.ru

 

Marat Davletovich Valeev, Dr. of tech. sci.

 

LLC NPP "VM sistema"

Kumlekul′, Ufa district, Republic of Bashkortostan, Russian Federation,

e-mail: vm5943@mail.ru

 

The paper discusses the prospects for the implementation of the technology of oil simultaneous separate production (SSP) when developing multilayer oil deposits in the Western Siberia fields. A theoretical assessment of the SSP implementation in two-layer deposits is given based on the assumed bottomhole, reservoir pressures and fluid withdrawals from the reservoirs.

 

Keywords: simultaneous-separate oil production; multi-layer reservoir; low permeability reservoirs; installation of electric centrifugal pumps.

 

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UDC 622.276.64          DOI: 10.33285/0207-2351-2021-11(635)-49-53

 

REGULATION OF RHEOLOGICAL PROPERTIES OF CROSS-LINKED POLYMER SYSTEMS
DEPENDING ON POLYACRYLAMIDE CONCENTRATION
AND FORMATION TEMPERATURE (p. 49)

 

Anna Vitalievna Kladova

Elena Gennadievna Uzyarkina

 

LUKOIL–Engineering Limited KogalymNIPIneft Branch Office in Tyumen

Kogalym, Tyumen region, Khanty-Mansi autonomous territory − Yugra, Russian Federation,

e-mail: KladovaAV@tmn.lukoil.com, UzyarkinaEG@tmn.lukoil.com

 

Cross-linked polymer systems possess visco-elastic and elastic-plastic properties, due to which they effectively isolate water-saturated channels in highly permeable zones of a formation. Depending on the gelation conditions, systems with different characteristics can be obtained, adapted to the technological processes of oil production. The paper presents the results of experimental studies which were carried out to reveal the rheological properties of cross-linked polymer systems depending on the polyacrylamide concentration and the temperature effects. The research results are used to simulate wells treatment processes and to optimize the composition for the conditions of the object development.

 

Keywords: cross-linked polymer systems; polyacrylamide; the Western Siberia; enhanced oil recovery; viscosity; rheology.

 

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UDC 622.276.652          DOI: 10.33285/0207-2351-2021-11(635)-54-58

 

DEFINITION OF OPTIMAL PARAMETERS AND EFFICIENCY ANALYSIS OF CYCLIC STEAM
STIMULATION AT TERRIGENOUS RESERVOIRS OF HIGH-VISCOSITY
OIL FIELDS IN THE SAMARA REGION (p. 54)

 

Natalia Valerievna Lesina,

Konstantin Andreevich Kashnikov,

Gennadiy Aleksandrovich Usachev

 

LUKOIL–Engineering LLC

Moscow, Russian Federation

 

Konstantin Aleksandrovich Shchekoldin,

Sergey Yaroslavovich Malaniy

 

LLC "RITEK"

Volgograd, Russian Federation

 

Sergey Valerievich Tsvetkov

 

"RITEK–Samara-Nafta"

Samara, Russian Federation

 

The article discusses the experience of implementing the technology of cyclic steam stimulation of horizontal wells at terrigenous reservoirs of high-viscosity oil fields in the Samara region. Based on hydrodynamic simulation in the CMG software, the optimal volume of steam injection and the recommended soak time after steam stimulation are determined. According to the results of pilot project analysis, the main factors of the efficiency of steam injection and the features of well development after stimulation were identified.

 

Keywords: cyclic steam stimulation; steam injection; steam oil ratio; high-viscosity oil; technology optimization; efficiency analysis; CMG software.

 

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UDC 622.245.1+519.234          DOI: 10.33285/0207-2351-2021-11(635)-59-65

 

APPLICATION OF MATHEMATICAL STATISTICS METHODS FOR DEVELOPMENT
OF MEASURES TO IMPROVE THE OPERATIONAL RELIABILITY
OF WELLS WHEN USING THERMAL METHODS
OF OIL RECOVERY (p. 59)

 

Denis Sergeevich Loparev,

Nataliya Grigorievna Deminskaya, Cand. of tech. sci.,

Andrey Gennadievich Fadeev,

Artem Vladimirovich Levin

 

LUKOIL−Engineering Limited PermNIPIneft Branch Office in Perm

Perm, Russian Federation

 

In the process of cyclic steam stimulation of wells at a high-viscosity oil field, an increased accident rate was noted, associated with the support integrity violation and downhole equipment. The problem was characterized by casing strings failures, cement stone destruction and downhole equipment accidents.

To analyze the above-said problems, statistical information and retrospective data were collected from 200 wells, including design features of wells, heat treatment modes and information on emergency response for. From this array of information, a representative sample was selected (n = 152), which has satisfactory quality information for statistical research.

The paper describes a correlation analysis of the data obtained during sampling of 152 wells to assess the influence of technological and design factors on the final accident rate. For the analysis of correlations, considering the specifics of the initial data, the method of rank correlations was chosen, with the calculation of the Spearman rank-order correlation coefficient (rs) and Kendall tau rank correlation coefficient (τk).

The results of the analysis showed that out of several previously supposed reasons, only two were statistically significant: the zenith angle in the interval of installation of downhole equipment (rs = 0,31, τk = 0,25) and the service life-time (rs = 0,35, τk = 0,28). Considering the results of the study, constructive and technological recommendations for the construction and operation of wells were developed, which made it possible to reduce the accident rate by 78 %.

 

Keywords: correlation analysis; Cyclic Steam Stimulation (CSS); accidents during operation; mathematical statistics; Spearman rank-order correlation coefficient; Kendall tau rank correlation coefficient; data analysis; thermal enhanced oil recovery methods; high-viscosity oil.

 

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UDC 622.24          DOI: 10.33285/0207-2351-2021-11(635)-66-70

 

IMPROVEMENT OF TECHNICAL MEANS FOR COMPLETION OF HORIZONTAL WELLS (p. 66)

 

Daniyar Lyabipovich Bakirov1,2, Cand. of tech. sci.

Marsel Masalimovich Fattakhov1,

Grigory Nikolaevich Gritsay1,

Dmitry Yakovlevich Patrushev1,

Vasily Vladimirovich Antonov1,

Artur Kamilevich Shiriev1,

Alexander Matveevich Shurupov3,

Vadim Valerievich Fatikhov3

 

1LUKOIL–Engineering Limited KogalymNIPIneft Branch Office in Tyumen

Tyumen, Russian Federation,

e-mail: BakirovDL@tmn.lukoil.com

 

2Industrial University of Tyumen

Tyumen, Russian Federation

 

3LLC "LUKOIL−Western Siberia"

Kogalym, Tyumen region, Khanty-Mansi autonomous territory − Yugra, Russian Federation

 

The description of the developed technology for finishing horizontal wells, which does not require normalization of the flow section after cementing the production string, is given. The design and principle of operation of the device for collar cementing is presented.

 

Keywords: horizontal wells; three-string construction; time reduction; completion technology; collar cementing.

 

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UDC 622.279.5:556.343          DOI: 10.33285/0207-2351-2021-11(635)-71-74

 

ON COMPLICATIONS WHEN OPERATING GAS-CONDENSATE WELLS
OF THE PYAKYAKHINSKOE FIELD RELATED TO THE APPEARANCE
OF LIQUID "PLUGS" AT THE BOTTOMHOLE (p. 71)

 

Kirill Evgenievich Kordik, Cand. of tech. sci.,

Ilnur Kamilevich Abdulin,

Oleg Yurievich Zabrodin,

Alexander Vladimirovich Shlyapchinsky

 

LUKOIL–Engineering Limited KogalymNIPIneft Branch Office in Tyumen

Tyumen, Russian Federation,

e-mail: KordikKE@tmn.lukoil.com, AbdulinIK@tmn.lukoil.com, ZabrodinOY@tmn.lukoil.com, ShlyapchinskiyAV@tmn.lukoil.com

 

Vladislav Gennadievich Zipir

 

"Yamalneftegaz" Territorial Production Department (TPD) LLC "LUKOIL−Western Siberia"

Salekhard, Yamalo-Nenets autonomous territory, Tyumen region, Russian Federation,

e-mail: Vladislav.Zipir@lukoil.com

 

Sergey Aleksandrovich Leontiev, Dr. of tech. sci., Professor

 

Industrial University of Tyumen

Tyumen, Russian Federation,

e-mail: leontevsa@tyuiu.ru

 

The paper discusses the possible reasons for the formation of liquid "plugs" at the bottomhole of horizontal gas condensate wells of the Pyakyakhinskoye field. When gas flow rates are insufficient, liquid accumulates at the bottomhole of gas condensate wells, causing a decrease of pressure, up to a complete cessation of fluid flow from the formation. This phenomenon has a negative impact on the profitability of gas condensate wells operation due to operating costs increase and is the reason for a decrease of the gas recovery factor. The paper presents the results of calculations performed using special software to determine the optimal operating mode for gas condensate wells, taking into account the existing risks of liquid "plugs" at the bottomhole. Recommendations are given on the implementation of measures to prevent complications.

 

Keywords: gas condensate well; liquid "plugs"; tubing diameter; water-gas factor; optimal well operation mode; "self-sealing" of wells.

 

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UDC 622.276.72          DOI: 10.33285/0207-2351-2021-11(635)-75-78

 

ANALYSIS OF THE DEPOSITS COMPOSITION FROM THE BOREHOLE EQUIPMENT (p. 75)

 

Anna Vitalievna Kladova

Elena Vasilievna Shamsutdinova

 

LUKOIL–Engineering Limited KogalymNIPIneft Branch Office in Tyumen

Kogalym, Tyumen region, Khanty-Mansi autonomous territory − Yugra, Russian Federation,

e-mail: KladovaAV@tmn.lukoil.com, ShamsutdinovaEV2@tmn.lukoil.com

 

Fields development is complicated by precipitation in oilfield equipment, which causes reduction of its productivity and idle time. To reduce the negative impact, prevent the formation of complex precipitation deposits and select the optimal removal method, it is necessary to establish the cause of their occurrence. The paper presents the results of qualitative and quantitative analysis of sediment samples taken from borehole equipment.

 

Keywords: enhanced oil recovery; chemical reagents; proppant; laboratory research; oil deposits.

 

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UDC 622.244.442.063(470.13)          DOI: 10.33285/0207-2351-2021-11(635)-79-84

 

EXPERIENCE OF DRILLING WELLS IN THE INTERVALS OF HIGHLY SWELLING "REACTIVE" CLAYS ON THE EXAMPLE OF THE DENISOVSKY LICENSE AREA (p. 79)

 

Sergey Sergeevich Kharin

Mikhail Nikolaevich Kardyshev,

Irina Leonidovna Nekrasova, Dr. of tech. sci.,

Pavel Aleksandrovich Khvoshchin, Cand. of tech. sci.,

Olga Vladimirovna Garshina, Cand. of tech. sci.,

 

LUKOIL–Engineering PermNIPIneft Branch Office in Perm

Perm, Russian Federation,

e-mail: Sergej.Kharin@pnn.lukoil.com

 

Dmitry Vladimirovich Frankov

 

LLC "LUKOIL–Komi"

Usinsk, Republic of Komi, Russian Federation,

e-mail: Dmitry.Frankov@lukoil.com

 

When drilling intervals for a 245 mm diameter casing string at the fields of LLC "LUKOIL–Komi" located within the Denisovsky license area, a large number of complications are noted in the form of tightening and landings, gland formation, non-passing and sticking of drill and casing strings. These complications are accompanied by a significant cost of time and money to eliminate their consequences. The paper discusses the results of wells drilling in the intervals of highly swelling "reactive" clays. The features of the geological structure of the drilling interval are presented. The experience of drilling with the use of water-based drilling fluids with the use of fresh polymer clay solutions, based on acrylic polymers, as well as the results of testing of highly inhibited muds on a fresh and mineralized basis are presented. The results of water-based muds testing showed that the problem of loss of wellbore stability has not been completely solved. In order to improve the technical-economic indicators of drilling, field tests of oil-based mud (OBM) were carried out. The use of OBM made it possible to avoid complications associated with wellbore instability and swelling of plastic clays. A reduction in the construction time of intervals has been achieved. A set of technological measures aimed at preventing complications during the construction process has been proposed. The OBM technology for drilling an interval for a 245 mm diameter casing string is a ready-made solution to prevent complications associated with wells walls destabilization.

 

Keywords: oil-based mud; water-based mud; the Denisovsky license area; well stability; wellbore instability; clay swelling; clay hydration inhibitor; set of measures.

 

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UDC 622.276.34          DOI: 10.33285/0207-2351-2021-11(635)-85-91

 

AN EXAMPLE OF OPTIMIZATION OF LOCATION OF BOREHOLES IN THE UPPER JURASSIC SEDIMENTS OF THE SREDNE-NAZYMSKIY DEPOSIT IN THE WESTERN SIBERIA (p. 85)

 

Dmitriy Aleksandrovich Mett, Cand. of tech. sci.,

Alexandra Evgenievna Privoznova

Tatyana Nikolaevna Nikolaeva

Ekaterina Vladimirovna Sobaeva

 

LLC "LUKOIL–Engineering"

Moscow, Russian Federation,

e-mail: alexandra.privoznova@lukoil.com, Tatyana.Nikolaeva@lukoil.com, Ekaterina.V.Petrova@lukoil.com

 

The paper presents a method for the optimized placement of production wells with horizontal completion in the Upper Jurassic deposits using complex hydrodynamic studies on reference wells. This approach makes it possible to obtain the dependence of the hydro-conductivity on the structural factor, with the help of which the productivity forecast for the entire considered area of the field is constructed.

 

Keywords: hydrodynamic research; structural factor; Upper Jurassic deposits.

 

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NATIONAL UNIVERSITY OF OIL AND GAS "GUBKIN UNIVERSITY"

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