Oilfield Engineering

OPTIMIZATION OF THE OPTION SELECTED FOR THE IMPLEMENTATION OF THE
DEVELOPMENT AND PROGRAM FOR ADDITIONAL EXPLORATION
OF THE TURONIAN DEPOSIT, TAKING INTO ACCOUNT THE INFLUENCE
OF GEOLOGICAL AND TECHNOLOGICAL UNCERTAINTIES (p. 5)

Diana Dmitrievna Romanova,

Anton Nikolaevich Kiselev,

Oleg Vladimirovich Novopashin,

Iliya Sergeevich Degtyarev

LLC "Tyumen Petroleum Research Center"

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

e-mail: avivanova@tnnc.rosneft.ru

Radik Aslyamovich Yagudin, Саnd. of tech. sci.,

Alexander Aleksandrovich Aleksandrov

Kharampurneftegaz LLC

3, 1-ya Panel str., Production base № 0028, Gubkinsky, 629830, Yamalo-Nenets autonomous territory, Russian Federation

The use of hydrodynamic modeling allows selecting the optimal strategy for the development of a production facility. However, at the early stages of the object studying, the forecast can be characterized by significant uncertainties associated with the lack or inaccuracy of the initial data, therefore, to minimize the risks associated with the technical-economic efficiency of the project, multivariate modeling is used. Accounting of the uncertainties provides covering of the entire range of probable production profiles and determining the "quantiles" of the probability of each of them. The paper discusses the influence of the main petrophysical, geological, hydrodynamic and geomechanical parameters of uncertainty on the technical-economic indicators of T formation development options, describes the options for optimizing the development, taking into account the uncertainty parameters, as well as the development of a research program to clarify the uncertainty parameters that most affect the economic result.

Keywords: uncertainty; multivariate calculations; probability; forecast; optimization of development; Turonian; dry gas.

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UDC 622.276.031.011.431:550.882.3:532.685 DOI: 10.33285/0207-2351-2021-5(629)-14-17

THE SUBSTANTIATION OF INTERRELATED CORRELATIONS FOR RESIDUAL OIL AND WATER SATURATIONS FOR RESERVOIR SIMULATION (p. 14)

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

LUKOIL–Engineering LLC

3, bld. 1, Pokrovsky boulevard, Moscow, 109028, Russian Federation,

e-mail: ivan.sannikov@lukoil.com

Farida Sabigiyarovna Khismatullina, Саnd. of phys.-math. sci.

National University of Oil and Gas "Gubkin University"

65, bld. 1, Leninsky prosp., Moscow, 119991, Russian Federation,

e-mail: Farida.khismatullina@lukoil.com

An approach to the joint statistical regression of the experimental results of critical water saturation and displacement factor on core samples to substantiate the dependences of the end points of the relative phase permeabilities is presented. Because of the joint regression of the experimental results, the dependences for the displacement factor and residual oil saturation are clarified in the ranges of porosity and permeability, poorly provided with actual data. The form of dependencies provides the possibility of a continuous and mutually agreed description of the filtration properties of rocks, both above and below the cut-off. The resulting dependences retain their physical meaning at the limiting values of the arguments.

Keywords: relative permeabilities; recovery factor; critical water saturation; residual oil saturation; reservoir simulation.

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UDC 622.276.432 DOI: 10.33285/0207-2351-2021-5(629)-18-25

THE TECHNOGENIC TRANSFORMATION OF PRODUCTIVE FORMATIONS DUE
TO THE INCREASED DISCHARGE PRESSURE DURING FLOODING (p. 18)

Alexey Aleksandrovich Izotov,

Denis Gennadievich Afonin, Cand. of tech. sci.

LLC "Tyumen Petroleum Research Center"

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

e-mail: aaizotov@tnnc.rosneft.ru; dgafonin@tnnc.rosneft.ru

The current level of water cut in the developed deposits in Western Siberia averages 89 %, which is 5 % higher than the average for the Ural Volga region, while the development of the latter was started 30 years earlier. High flooding cut is associated with both the geological features of the deposits, for example, the active involvement of hard-to-recover reserves, and with the principles of formation pressure.

As soon as low-permeability reserves are involved in development, there are more and more heterogeneous reservoirs, rapidly rimmed wells with mobile reserves in the drainage area. In practice, they try to explain this by calling such reserves difficult to recover. To no less extent by the applied technologies of their extraction. After the application of waterflooding in the subsoil, at best, 60…70 % of oil reserves remain, and with its irrational use, this value can be significantly higher in the practice of oil production, there are examples of the negative effect of increased pumping pressures on development indicators due to the formation of the layer sins. Therefore, the question is legitimate whether an increase in repression on the reservoir can lead to irreversible negative consequences? The purpose of this article is to highlight the mechanism of technogenic transformation of the structure of low-permeability formations with an increase in injection pressure.

Keywords: accontronized collectors; auto hydraulic fracturing; technogenic tracks; watering; radial training system.

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UDC 622.276.1/.4 DOI: 10.33285/0207-2351-2021-5(629)-26-28

THEORETICAL JUSTIFICATION OF THE RESERVES UNDERPRODUCTION BASED
ON THE ANALYSIS OF THE DYNAMICS OF WELLS MODES AND DEPENDENCES
OF RELATIVE PHASE PERMEABILITIES (p. 26)

Vitaly Nikolaevich Melnikov,

Vladimir Vitalievich Vakhrushev

LUKOIL–Engineering Limited KogalymNIPIneft Branch Office in Tyumen

143a, Respublika str., Tyumen, 625026, Russian Federation,

e-mail: melnikovvn@tmn.lukoil.com

Alexander Vladimirovich Strekalov, Dr. of tech. sci.

Industrial University of Tyumen

38, Volodarsky str., Tyumen, 625000, Russian Federation

The article is devoted to the problem of assessing of oil reserves production using as a tool for analyzing the displacement characteristics obtained by the proposed method through the functions of relative phase permeabilities.

Keywords: relative phase permeabilities; underproduction of reserves; horizontal well; multi-stage hydraulic fracturing; multilateral well; oil recovery factor; Buckley – Leverett law.

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UDC 622.276.51-52 DOI: 10.33285/0207-2351-2021-5(629)-29-33

EXTENSION OF TERMS AND INCREASE OF MARGINAL WATERING OF WELLS FLOWING (p. 29)

Petimat Umatovna Musaeva,

Magomed Makhmudovich Labazanov, Cand. of geol.-mineral. sci.,

Abdulla Shirvanievich Khaladov, Cand. of tech. sci.,

Vakha Akhmadovich Muskhanov,

Islam Rashitovich Masarov,

Magomed Saypudievich Khaladov,

Magomed Makhmudovich Dudaev

Federal State-Funded Educational Institution of Higher Education "Millionshchikov Grozny State Oil Technical University"

100, X.A. Isaev prosp., Grozny, 364051, Chechen Republic, Russian Federation,

e-mail: haladov_a_sh@mail.ru

When developing oil fields at the late stage, new technologies applied to increase the oil recovery coefficient becomes a factor determining technical-economic efficiency of an oil producing enterprise.

At this stage, an increasing number of wells are moving into the category of structures with a long history of operation, accordingly, the volume of capital expenditures for maintaining oil and gas production levels increases.

Keywords: wells; temperature; oil strata; wells flowing; mechanized production; thermal lift; geothermal stratum; water cut; pressure; reservoir.

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UDC 622.276.43 DOI: 10.33285/0207-2351-2021-5(629)-34-38

BLOCK ANALYSIS OF THE CURRENT COMPENSATION OF LIQUID WITHDRAWAL
BY INJECTION AND JUSTIFICATION OF THE INJECTION EFFICIENCY COEFFICIENT (p. 34)

Elizaveta Viktorovna Soboleva,

Olga Andreevna Tretyakova

LUKOIL−PERM LLC

62, Lenin str., Perm, 614000, Perm region, Russian Federation,

e-mail: Lizi.89@inbox.ru

At present, digital technologies are being actively developed, new software products are being introduced, including those for oil fields modeling. The main purpose of using modeling tools is to improve the quality of decision-making. Recent trends in the practice of developing oil fields are increasingly shifting emphasis towards the principles of organizing and controling waterflooding patterns.

Keywords: modeling; oil-field; waterflooding pattern; hydrodynamic model; compartmental analysis; integrated model.

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UDC 622.276 DOI: 10.33285/0207-2351-2021-5(629)-39-42

JUSTIFICATION OF THE MINIMUMAL NUMBER OF LABORATORY STUDIES REQUIRED
FOR APPLYING THERMAL AND GAS METHODS TO STUDY THEIR IMPACT
ON THE FORMATIONS OF THE UPPER JURASSIC DEPOSITS ON THE EXAMPLE
OF THE SENSITIVITY ANALYSIS CALCULATION OF THE HYDRODYNAMIC MODEL
OF THE ADAPTED EXPERIMENT. PART 2 (p. 39)

Tatyana Nikolaevna Nikolaeva,

Dmitriy Aleksandrovich Mett, Cand. of tech. sci.

LUKOIL–Engineering LLC

3, bld. 1, Pokrovsky boulevard, Moscow, 109028, Russian Federation,

e-mail: Tatyana.Nikolaeva@lukoil.com; Dmitrij.Mett@lukoil.com

The presented article, which consists of two parts, considers an approach to the selection of the minimum required and sufficient number of laboratory studies on the example of calculation of the sensitivity analysis in an adapted hydrodynamic model (HDM) for an actual experiment using the CMG stars simulator. The most significant parameters were identified and considered: the initial permeability of the non-drained part when exposed to temperature, the initial geological porosity of the non-drained part, molar masses of coke and kerogen (kg/mol), kerogen density (kg/m3), TOC (%) (Copr), ratios of gas, oil and coke by weight in the equation of kerogen cracking (%).

The first part of the article discusses an approach to the experiment modeling, on the basis of which a sensitivity analysis will be made and the hydrodynamic model will be adapted to the actual results. Further on, the influence of various necessary parameters set in the HDM on the calculation results is considered.

The second part of the article includes the added parameters, and on the basis of all the calculations carried out and the data obtained, a conclusion is made about a possible optimal reduction in the number of studies at the stage of pilot work for rocks of the Upper Jurassic deposits and the creation of a hydrodynamic model under conditions of the minimum allowable amount of initial data.

Keywords: adapted hydrodynamic model; molar mass and density of kerogen; modeling; research; initial data.

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UDC 622.279.23/.4.001.57+550.832 DOI: 10.33285/0207-2351-2021-5(629)-43-50

COMPREHENSIVE EVALUATION OF THE RESULTS OF WELLS CONSTRUCTION
AS AN IMPORTANT TOOL FOR SPECIFYING THE GEOLOGICAL MODEL (p. 43)

Ildar Abdulkhaevich Kunakkuzhin,

Stepan Yurievich Nimchuk,

Alexander Vadimovich Akin′shin,

Alexander Yurievich Orlov,

Alexey Sergeevich Shchetinin,

Evgeny Viktorovich Bondar′

LLC "Tyumen Petroleum Research Center"

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

e-mail: avivanova@tnnc.rosneft.ru

Galina Valentinovna Igolkina

Bulashevich Institute of Geophysics UB RAS

100, Amundsen str., Yekaterinburg, 620016, Russian Federation

Effective planning of geological-technological measures and drilling new wells depends on the quality of the applied geological and hydrodynamic models. A correct forecast of the wells fund water-flooding brings savings to the company’s budget due to optimization of the location and correction of future wells number.

Drilling of horizontal wells is often supported by a geosteering service. As a result, geological models built according to well placement results require separate expertise due to a human error.

The article presents a comprehensive analysis of the results of horizontal wells geological drilling.

The analysis includes four stages: revision of the stratigraphy results; construction of geosteering models according to the previous and new drilling concepts; overlaying the production logging profile on the previous and new concepts of the reservoir penetration; correction of geological and hydrodynamic models with updating of the lithology cube and points of the formation top penetration.

Based on the results of the analysis, the idea of the structure occurrence in one of the zones of the area changed, which in turn changed the geological and hydrodynamic models, corrected the plan for new wells drilling and optimized the company’s financial costs.

Keywords: analysis of geosteering models; petrophysical interpretation of drilling results; field geophysical research; construction of geological models.

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UDC 622.276.5.057:681.128+621.316.71 DOI: 10.33285/0207-2351-2021-5(629)-51-55

EVALUATION OF DYNAMIC FLUID LEVEL IN OIL PRODUCTION WELLS (p. 51)

Ildar Zafirovich Denislamov, Cand. of tech. sci.,

Airat Rimovich Khafizov, Dr. of tech. sci.,

Rustam Rauilevich Ishbaev,

Liliya Rustamovna Galimova

Ufa State Petroleum Technological University

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

e-mail: denislamoviz@mail.ru

Artur Maratovich Galimov, Cand. of tech. sci.

Bashneft–Dobycha LLC

30, bld. 1, K. Marks str., Ufa, 450008, Republic of Bashkortostan, Russian Federation.

Periodic measurements of the dynamic fluid level in the annular space (AS) of oil producing wells allow the technical staff of the enterprise to evaluate the efficiency of the reservoir – well – pump system. A constant fluid level over time indicates the stability of this system, despite possible deterioration of the bottomhole formation zone or pump and tubing string due to the appearance of asphalt-resin-paraffin or other sediments. A one-sided change in the flow rate of fluids into the well from the formation or along the tubing string causes a certain response in the well operation (as part of the system under consideration) until stabilization at a new level occurs. These fluctuations of the system show the dynamic level of the liquid in the AS of the well, but due to the rare measurement of the level, some of the processes occurring in the well space are ignored by the geological and technological services of the enterprise.

The paper proposes to estimate the oil level in the annular space of the well with the required frequency in remote mode without organizing field work in the wells. The considered method is based on the difference in the heat-conducting properties of the gaseous medium and oil in the well.

Keywords: annular space; dynamic fluid level; coefficient of thermal conductivity; heating cable; resistance; current strength.

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UDC 622.279.5.001.42 DOI: 10.33285/0207-2351-2021-5(629)-56-64

NEW TECHNIQUE FOR TESTING (STUDYING) GAS AND GAS CONDENSATE WELLS BASED
ON SELF-SIMILAR MODES OF NON-STATIONARY ISOTHERMAL NONLINEAR FILTRATION (p. 56)

Vladimir Georgievich Griguletsky, Dr. of tech. sci., Professor

National University of Oil and Gas "Gubkin University"

65, Leninsky prosp., Moscow, 119991, Russian Federation,

e-mail: gvg-tnc@mail.ru

Yury Petrovich Savel′ev

Baltic State Technical University "VOENMEH" named after D.F. Ustinov

1, 1-ya Krasnoarmeyskaya str., Saint-Petersburg, 190005, Russian Federation

The object of the research is gas and gas condensate wells. The article considers the determination of the reservoir properties of pro-ductive formations based on the use of field experimental results of gas-dynamic tests of wells in stationary and non-stationary modes (flow rate – pressure in the well bottom) as boundary conditions when solving the equations of underground fluid dynamics.

Numerical modeling is carried out on the basis of a joint solution of the non-stationary continuity equation and the non-stationary analogue of the Forchheimer's equation for the radial pressure gradient at flat-radial filtration.

For an isothermal filtration process, mathematical modeling means solution of a seven-point boundary value problem for a system of ordinary differential equations of the sixth order.

As a result, the reservoir properties were determined and, on their basis, the regularities of the flow rate change over time were re-vealed at the given well bottom pressure isobars.

Keywords: reservoir parameters; reservoir transmissibility factor; piezo conductivity; productivity; gas flow rate; formation pressure; well bottom pressure; nonlinear filtration law; pressure build-up curve.

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NATIONAL UNIVERSITY OF OIL AND GAS "GUBKIN UNIVERSITY"

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