Oilfield Engineering

The quantitative estimation of the interaction between production and injection wells is the most important task of effective monitoring of oil fields development. The widespread use of one of the most reliable methods for solving this problem, namely, tracer studies, is difficult due to economic reasons. However, the experience of conducting tracer studies allows studying and improving indirect methods for assessing the interaction among wells. This paper presents the results of studies on the development of a methodology for assessing the interaction among production and injection wells of the Tournaisian-Fammenian deposit of the Gagarinskoye field, where large-scale tracer studies were conducted. It is established that the techniques based on the correlation of flow rate and injectivity provide no reliable solution of the set problem. This fact caused the necessity of developing a technique based on a multi-level statistical analysis of the accumulated injection and fluid production. Comparison of the results of applying this technique with the materials of tracer studies confirms its high reliability when assessing the distribution of injection volumes if the reservoir pressure maintenance system is fully formed.

Keywords: monitoring of oil field development; reservoir pressure maintenance system; injection distribution; interaction between production and injection wells; tracer studies; methods for assessing the distribution of injection volumes; correlation; multi-level statistical modeling.

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UDC 622.276.41 DOI: 10.30713/0207-2351-2020-4(616)-10-16

SUBSTANTIATION OF THE EFFICIENCY OF USING CARBON DIOXIDE IN THE SUPERCRITICAL STATE FOR HIGH-VISCOUS OIL PRODUCTION BY THE THERMODYNAMIC MODELING DATA (p. 10)

Elena Viktorovna Alekina,

Valeriya Aleksandrovna Olkhovskaya, Cand. of tech. sci.,

Kirill Aleksandrovich Ovchinnikov, Cand. of chem. sci.

Samara State Technical University

244, Molodogvardeyskaya str., Samara, 443100, Russian Federation,

e-mail: alekina-samgtu@mail.ru; valeriaolh@mail.ru; ovchinnikov.ka@samgtu.ru

The paper investigates the mechanism of exposure of carbon dioxide CO₂ in a supercritical state on an oil reservoir. The results of modeling the thermodynamic behavior of the carbon dioxide – high viscosity oil under varying thermobaric conditions are presented. The presence of three phases in the reservoir was diagnosed: oil in CO₂ – vapor phase; CO₂ dissolved in oil – heavy liquid phase; mutually dissolved CO₂ and oil – light liquid phase. The exothermic effect when mixing carbon dioxide and oil in the near-critical and critical areas of pure CO₂ is revealed. The dependence of the studied oil viscosity on the carbon dioxide content in was obtained and their optimal ratio was determined when CO₂ injection into the well bottom zone of the producing well will increase the mobility of the oil in the radius of processing and its flow rate.

Keywords: high viscosity oil; carbon dioxide; supercritical state; thermobaric conditions; phase transition; flow rate increase.

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UDC 622.276.66 КГ DOI: 10.30713/0207-2351-2020-4(616)-17-22

GEOLOGICAL-TECHNOLOGICAL SUBSTANTIATION FOR CONDUCTING HYDRAULIC FRACTURING
OF A FORMATION IN PRODUCTION WELLS (p. 17)

Alexey Mikhailovich Zinoviev, Cand. of tech. sci.,

Pavel Anatolievich Ptichkin,

Sergey Olegovich Kotlyarov,

Alexander Sergeevich Gavryushin

Samara State Technical University

244, Molodogvardeyskaya str., Samara, 443100, Russian Federation,

e-mail: lekso1988@yandex.ru; ptichkin.pa@mail.ru; serega.notell@gmail.com; gavryushinAS@gmail.com

The paper presents a geological-technological substantiation of using acid hydraulic fracturing of a formation (AHFF) for the production fund of oil fields as well as the prospects of its conducting in producing wells. The experience of carrying out an acid hydraulic fracturing of a formation in the oil fields of Russia is considered. The ways of improving the technology of acid hydraulic fracturing of a formation for low-permeability and weakly drained carbonate reservoirs are studied. The main criteria for selecting wells for hydraulic fracturing are highlighted.

To achieve this goal and solve the set problems, theoretical and empirical research methods were used.

Keywords: acid hydraulic fracturing of a formation; enhancement of oil recovery; geological-technical measures; proppant; permeability; reservoir.

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UDC 622.276.63 DOI: 10.30713/0207-2351-2020-4(616)-23-26

COMPLICATIONS ARISING DUE TO HYDROCHLORIC ACID EFFECTS ON CARBONATE ROCKS
AND THEIR ELIMINATION (p. 23)

Shamil Ramilevich Ganiev,

Alexey Vladimirovich Lysenkov, Cand. of tech. sci.,

Alexey Leonidovich Mikhailov

Ufa State Petroleum Technology University

1, Kosmonavtov str., Ufa, 450064, Republic of Bashkortostan, Russian Federation,

e-mail: ganiev.shml@rambler.ru; rusoil.aleksey@mail.ru; alexsij_mixajlov_95@bk.ru

It is known that the main method of oil production enhancement from the carbonate reservoirs of the Republic of Bashkortostan is hydrochloric acid treatment (HCAT) of wells. When conducting hydrochloric acid treatment (HCAT) of wells, there occur various complications. Moreover, complications arise comprehensively, worsening the effectiveness of treatments and decreasing the intensity of oil reservoirs development. In this regard, it is necessary to search for the methods that will prevent the arising complications. The paper discusses the complications of technological and geological nature that occur during the hydrochloric acid treatment of wells in the fields of the Republic of Bashkortostan, the causes of their occurrence and analyzes the main methods and ways of preventing complications.

Keywords: carbonate rocks; hydrochloric acid treatment; well; oil; complications.

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UDC 622.276.2.001.57 DOI: 10.30713/0207-2351-2020-4(616)-27-31

MONITORING OF RESERVOIR CHARACTERISTICS BY THE DATA OF BRINGING ON THE WELL
TO STABLE PRODUCTION (p. 27)

Oleg Alekseevich Gribennikov, Cand. of tech. sci.,

Arseny Alekseevich Melnikov

Samara State Technical University

244, Molodogvardeyskaya str., Samara, 443100, Russian Federation,

e-mail: gribennikov.oa@samgtu.ru

The article presents an additional research tool that allows getting reservoir filtration characteristics. A mathematical model is briefly presented, on the basis of which the least squares method is applied to obtain and interpret output data of bringing the well on to stable production. The proposed approach has significant advantages compared to the classical approach (conducting of hydrodynamic tests by shutting down a well to read the pressure recovery curve), namely: there is no need to shut down the well for research. In addition, taking into account the huge number of technological operations carried out to bring wells on to stable production will allow increasing the research coverage of the production wells stock. A calculation was performed according to the proposed interpretation algorithm, and a comparison with the field data was made. The comparison showed that the calculation error when using such parameters as permeability and reservoir pressure was less than 5 %, due to the sensitivity to the process and possible inaccuracy of the data, the inaccuracy by the skin factor made 17 %.

Keywords: bring wells on to stable production; reservoir characteristics; mathematical model; oil production; units of electrical centrifugal pumps; least squares method; data interpretation.

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UDC 622.276+622.692.4.01:532.5 DOI: 10.30713/0207-2351-2020-4(616)-32-36

APPROBATION OF THE COMPOSITIONAL HYDRAULIC "ENGINE" (ON THE EXAMPLE
OF ONE DEPOSIT IN SIBERIA) (p. 32)

Vadim Petrovich Shakshin,

Alexey Aleksandrovich Mokrev,

Artem Igorevich Kapustin

SamaraNIPIneft LLC

18, Vilonovskaya str., Samara, 443010, Russian Federation,

e-mail: kirjanovaEV@samnipi.rosneft.ru

Gas-oil mixture PVT properties are calculated by a compositional model application. An algorithm for solving the phase equilibrium problem for a three-phase system is presented. A comparison of the calculated linear pressures at the wells with the real data obtained from one of the fields in Siberia as well as a comparison with the data of the model calculation using PIPESIM 2017.2 simulator (manufacturer – Schlumberger company) are given.

Keywords: fluid model; compositional model; equation of state; phase equilibrium; calculation of PVT properties.

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UDC 622.276.5.001.5:622.276.5.003 DOI: 10.30713/0207-2351-2020-4(616)-37-40

DETERMINATION OF OPTIMAL NUMBER OF WELLS FOR RATE TRANSIENT ANALYSIS
FROM ECONOMIC POINT OF VIEW (p. 37)

Valeriy Askhatovich Iktisanov, Dr. of tech. sci., Professor,

Amur Fizyusovich Yartiev, Dr. of economic sci.

TatNIPIneft Institute – PJSC TATNEFT

32, M. Jalil str., Bugulma, 423236, Republic of Tatarstan, Russian Federation,

e-mail: iktissanov@tatnipi.ru; yartiev@tatnipi.ru

Method for determination of optimal number of wells for rate and pressure transient analysis is proposed. This method is based on probabilistic economic assessment of success rate losses during various formation and bottomhole treatment operations and evaluation of expenses associated with rate and pressure buildup tests and interpretations with account of the oil left behind. The resultant estimates suggest that transient tests should be conducted in 50 % of wells, on the average, under conditions specific to TATNEFT.

Keywords: rate transient analysis; flowing build-up curves; pressure build-up curves; oil production; expenses; success rate.

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UDC 622.691.12 DOI: 10.30713/0207-2351-2020-4(616)-41-47

PROCEDURE FOR JUSTIFYING PROCESS CONDITIONS OF GAS AND GAS CONDENSATE
WELLS USING INTEGRATED MODELS (p. 41)

Andrey Nikolaevich Kharitonov, Cand. of fiz.-mat. sci.,

Tatiyana Anatolievna Pospelova, Cand. of tech. sci.,

Anton Yurievich Yushkov, Cand. of tech. sci.,

Alexander Vladimirovich Strekalov, Dr. of tech. sci.,

Anna Sergeevna Zavorina,

Vasily Pavlovich Pavlov

LLC "Tyumen Petroleum Research Center"

42, Maxim Gorky str., Tyumen, 625048, Tyumen region, Russian Federation;

Oleg Anatolievich Loznyuk,

Yury Aleksandrovich Arkhipov, Cand. of tech. sci.,

Rosneft Oil Company

26/1, Sofiyskaya naberezhnaya, Moscow, 115035, Russian Federation;

Mikhail Aleksandrovich Skorobogach, Cand. of tech. sci.,

Alexey Leonidovich Nazarov

Sibneftegaz

78а, Taezhnaya str., Novy Urengoy, 629305, Yamal-Nenets autonomous region, Russian Federation.

The wells of gas and gas condensate fields are operated in accordance with the assigned operation conditions which are set on the basis of information obtained during the exploration, completion, and development of hydrocarbon reservoirs.

The operation conditions of wells should ensure uniform recovery of gas over the area, as well as maintain the parameters for stable and safe operation, taking into account all the subsurface and engineering limitations, including the maximum allowable drawdown and the absence of erosion of casing walls and hydrate formation. In case of significant water cuts in wells, it is also necessary to take into account the limitations on the throughput of a gas treatment unit and an industrial waste injection site.

The strong mutual influence of individual field elements requires a systematic approach to designing. An aquifer, a reservoir, wells, gas collection networks, gas treatment facilities and a booster complex should be regarded as a single thermo-hydrodynamic system in which all subsystems are interconnected. The optimal conditions for the joint operation of wells and field facilities that ensure gas recovery in accordance with the business plan at the maximum inlet pressure of a compressor station or a gas treatment plant, as well as the maximum possible condensate production must be justified.

This approach is implemented through the use of integrated geological and technological models which include all elements of a gas production and treatment system and provide a flow-through calculation from a reservoir to a trunk gas pipeline. The field is divided into two subsystems, i. e. a reservoir – wells – a gas buster station and a booster compressor station – a gas treatment unit; the functions of gas pressure vs recoveries at the junction of these subsystems at a gas buster station outlet before a booster compressor station are built, which determine the field working area. The field operation conditions are selected within this area, while maintaining the planned gas recoveries and ensuring the maximum economic performance of the field, which, as a rule, corresponds to the maximum pressure at a compressor station inlet which ensures lower compression ratios and fuel gas consumption.

A case study of Pyreiny gas condensate field is described with the estimated operation conditions of wells using the developed method. The estimates are in good agreement with the actual operation conditions as of September 2019.

The developed method for justifying the operation conditions of gas and gas condensate wells makes it possible to optimize the operation schedule of the entire field to achieve its maximum performance and safety.

Keywords: well operation conditions; gas gathering networks; booster compressor station; complex gas treatment unit; integrated model; maximum allowable drawdown; erosion wear.

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UDC 622.276.8:338.512 DOI: 10.30713/0207-2351-2020-4(616)-48-53

SOME SPECIFIC FEATURES OF SCENARIO CONDITIONS FORMATION FOR TECHNICAL-ECONOMIC ESTIMATES WHEN COMPARING OILFIELD SEPARATION EQUIPMENT OF DIFFERENT TYPES (p. 48)

Alexander Vladimirovich Grishagin,

Denis Vyacheslavovich Kashaev

SamaraNIPIneft LLC

18, Vilonovskaya str., Samara, 443010, Russian Federation,

e-mail: GrishaginAV@samnipi.rosneft.ru

Oleg Vladimirovich Gladunov

Samaraneftegaz JSC

50, Volzhsky prosp., Samara, 443071, Russian Federation,

е-mail: sng@samng.ru

The article considers the main parameters and characteristics taken into account when forming scenario conditions for technical-economic assessments of the use of oil field separation equipment of various types during oil wells dehydration. The examples of the results of comparison of the variants of assemblies of preliminary water disposal units by oil separation equipment, manufactured in Russia and abroad providing for their practical efficiency evaluation at the territory of Samara region, are presented. The authors of the paper proposed an enlarged matrix for the selection of oil separation equipment for the processes of gravitational thermochemical dewatering of oil during oil field preparation.

Keywords: oil emulsion dehydration; innovative oil separation equipment; feasibility calculations.

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UDC 622.276:532.137 DOI: 10.30713/0207-2351-2020-4(616)-54-59

EXPERIMENTAL STUDIES OF OIL VISCOSITY IN FIELD CONDITIONS TO ASSESS THE ERROR
OF THE MEASUREMENT WHEN USING HOPPLER VISCOSITY GAGE (p. 54)

Anatoliy Andreevich Isaev, Cand. of tech. sci.,

Vladimir Ivanovich Malykhin,

Almaz Amirzyanovich Sharifullin, Cand. of tech. sci.

Sheshmaoil Management company LLC

a/ya 192, P.O. No. 8, Almetyevsk, 423458, Republic of Tatarstan, Russian Federation,

e-mail: isaeff-oil@yandex.ru

Verification of the accuracy of oil viscosity measurement results using a new GNP viscometer based on the Höppler method developed by Sheshmaoil Management company LLC was found to be satisfactory. The results of dynamic viscosity measurements were obtained during the experimental studies on error and uncertainty evaluation, as well as the results of determination of metrological characteristics. The viscometer’s constant, ball falling time and the tool's reduced error in viscosity measurement were determined for various mixtures. The equations provided in the article make it possible to determine the dynamic viscosity, error and uncertainty of measurements.

Keywords: viscosity; water-in-oil emulsion; viscometer; measurement technique; the Höppler method; ball falling time; calibrated tube; measurement error.

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UDC 622.244.442.063.2 DOI: 10.30713/0207-2351-2020-4(616)-60-63

THE NECESSITY AND POSSIBILITIES OF CONTROL OF CATION POLYMERS CONTENT
IN THE FLUSHING FLUID DURING DRILLING (p. 60)

Zoya Valerievna Ulyanova

Perm National Research Polytechnic University

29, Komsomolsky prosp., Perm, 614990, Russian Federation,

e-mail: z.v.uljanova@pstu.ru

Yury Aleksandrovich Kulyshev

SIC "Energoresurs" JSC

42a, Gazety Zvezda str., Perm, 614039, Russian Federation,

e-mail: sic_er@mail.ru

As part of the efficiency monitoring task of a drilling fluid which contains cationic polymers, the objective necessity of controlling their quantity is shown. Given the low informativeness of the total cationic polymer concentration due to the rapid inactivation of its molecules caused by irreversible adsorption on drill cuttings, the need of monitoring the active polymer molecules quantity is emphasized. An approach allowing to make such assessment and to choose the supplementary treatments degree of the circulating solution with a cationic polymer at each time point of drilling is proposed. Taking into account the necessary informativeness, as well as the ease of implementation, the proposed approach practical value is quite obvious.

Keywords: clay rock; wellbore stability; mud quality management; cationic polymers; reagent content control techniques.

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UDC 622.276.72 DOI: 10.30713/0207-2351-2020-4(616)-64-68

INCREASE OF THE TEMPERATURE FORECAST ACCURACY ALONG THE WELLBORE
WITH ACCOUNT OF THE PRODUCTS MOVEMENT AND DEGASSING
SPECIFIC FEATURES (p. 64)

Vladislav Yurievich Nikulin,

Yury Veniaminovich Zeigman, Dr. of tech. sci., Professor

Ufa State Petroleum Technology University

1, Kosmonavtov str., Ufa, 450062, Republic of Bashkortostan, Russian Federation,

e-mail: NikulinVY@mail.ru; JVZeigman@yandex.ru

The article is devoted to the problems of improving the accuracy of predicting the temperature of borehole products in a producing well. The authors reveal the importance of the accurate determination of temperature distribution from the well bottom to the well head for solving a number of field tasks, including the efficiency increase of complicating factors prevention. Particular attention is paid to the specific features of widely used techniques, which are often either non-linear or difficult to use, or linear and do not take into account such important parameters as water cut and gas saturation of the produced products, which is important in conditions of changing the wells operating mode. Based on the conducted study, an algorithm is proposed that allows increase of the temperature calculation accuracy for any operation object using the Alves method. The main advantage of the adapted model is its easy application, accounting of products water cut and gas saturation effects. On the example of one of the deposits located in the Far North, an adapted model for calculating the temperature with a deviation from the actual values from the thermograms of not more than 4 °C is obtained.

Keywords: temperature; production well; model; prediction; degassing; algorithm; wax.

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