Oilfield Engineering

A mathematical model for the analysis of oil fields development by applying the method of waterflooding cells has been developed. This model provides prediction of the work of the existing water-flooded wells not only in case of the basic version, but also with account of changes in wells operational modes. It is assumed that the bottom hole and reservoir pressures are higher than the pressure of oil saturation by gas.

Keywords: flooding cells; development analysis; two-phase filtration.

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UDC 622.276.031:532.11 DOI: 10.30713/0207-2351-2018-9-12-16

CALCULATION OF SUPPORT NETWORK OF WELLS TO DETERMINE A RESERVOIR
PRESSURE (p. 12)

V.A. Iktisanov, Dr. of tech. sci., Professor,

A.V. Baygushev

"TatNIPIneft" of PJSC "Tatneft"

32, M. Jalil str., Bugulma, 423233, Republic of Tatarstan, Russian Federation,

e-mail: iktissanov@tatnipi.ru

At present, oil companies pay less attention to hydrodynamic study of wells. Many companies research not the entire operating well stock but only a part of it, which is called a support fund. Undoubtedly, a reduction in the number of studies leads to an increase in the uncertainty of the information needed to make technological decisions on managing a field’s development. Due to this fact, the article considers the problems of calculation of wells support stock to determine the reservoir pressure by the deposit or its sector, with account of the predetermined calculation error.

The method is based on a reservoir pressure distribution and the standard error of its identification, depending on the proportion of the wells support fund. The proposed method allows to strictly substantiate the number of measurements of reservoir pressure in wells while maintaining the specified accuracy of the mean value determination.

Keywords: reservoir pressure; support network; wells; hydrodynamic studies; error of identification; standard deviation.

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UDC 622.276.1/.4.001.57:550.832 DOI: 10.30713/0207-2351-2018-9-17-22

NEURAL SIMULATION WHEN CHOOSING THE PERFORATION INTERVAL OF THE UPPER
CRETACEOUS DEPOSITS ON THE EXAMPLE OF THE EASTERN STAVROPOL FIELDS (p. 17)

Ivan Borisovich Solovev,

Tatos Vladimirovich Arutyunov,

Egor Petrovich Chuikin

LLC "OC "Rosneft" – Scientific-Technical Center"

54, Krasnaya str., Krasnodar, 350000, Russian Federation,

e-mail: ibsolovev@rnntc.ru; tvarutyunov@rnntc.ru; epchuikin@rnntc.ru

Based on the experience of the Upper Cretaceous sediments development located in Stavropol territory, with account of the uncertainty considerable degree that occurs when developing this type of deposits, the modern methods applied to determine reservoir parameters by means of neural simulation are becoming more and more popular. The article considers the possibility of using an artificial neural network (ANN) to identify highly promising intervals of perforation of Upper Cretaceous sediments, which are characterized by a high degree of uncertainty.

The most developed object are the Lower Cretaceous deposits. The development of the Jurassic and Triassic deposits requires expensive drilling of new wells. The Paleogene deposits are classified as hard-to-recover reserves and numerous studies are needed to develop them. Due to this fact, the Upper Cretaceous deposits, the recovery rate of which is 56%, become the promising object of the Eastern Stavropol territory development. These deposits development is possible to implement by the existing wells fund, by carrying out "light" geological-technical measures well (re-completion by overlying formation, re-conservation, re-perforation).

Thus, the proposed neural simulation technique allows to define the low water-flooded intervals to provide economically efficient production of oil reserves.

Keywords: neural simulation; interval of perforation; the Upper Cretaceous deposits; water cut; neuron; production profile.

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UDC 551.735+553.98.061.3 DOI: 10.30713/0207-2351-2018-9-23-28

LIVEN ORGANOGENIC BUILD-UPS OF MIROSHNIKOVSKY-NIZHNE-DOBRINSKY SITE (p. 23)

A.N. Moroshkin, E.P. Medvedeva, N.V. Danshina

"VolgogradNIPImorneft", a branch of LLC "LUKOIL−Engineering" in Volgograd

10, Sovetskaya str., Volgograd, 400131, Russian Federation,

e-mail: amoroshkin@lukoilvmn.ru; emedvedeva@lukoilvmn.ru; ndanshina@lukoilvmn.ru

Lithological-paleontological characteristics of the Liven organogenic build-ups of the north-western frame of Umetovsko-Linevsky depression, located in the Volgograd Right Bank are presented. A schematic series of facies zones of the Liven paleo-basin are traced.

Keywords: organo-genic build-ups; facies zones; allochthonous reefs; bioherms.

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UDC 553.98.061.4:622.276.031.011.433:550.822.3 DOI: 10.30713/0207-2351-2018-9-29-32

ASSESSMENT OF PREFERENTIAL FILTRATION OF SELECTIVE COMPOSITIONS
USING DOUBLE-LAYER CORE MODELS (p. 29)

I.A. Kozhevnikov, K.V. Dmitriev

"PermNIPIneft", a branch of LLC "LUKOIL−Engineering" in Perm

29, Sovetskaya Armiya str., Perm, 614066, Russian Federation,

e-mail: Ilya.Kozhevnikov@pnn.lukoil.com; Kirill.Dmitriev@pnn.lukoil.com

In connection with the transition of deposits in the late stage of development and mass flooding of products, there is a need for carrying out geological and technical measures with the least expenses while maintaining the production potential of the well. These conditions are largely consistent with the technology of selective isolation of water inflow. The advantage of using technologies based on selective isolation is the possibility of injecting reagents into existing perforation intervals and repeatedly repeating the treatment procedure. To date, regulatory documents do not regulate the order of laboratory assessment of the effectiveness of waterproofing compounds. The article describes the technique for conducting additional filtration tests of selective technologies for water-shutoff using differently packed core models. This technique allows evaluating the ways of selective filtration of selective compounds in the simulated thermobaric conditions of the test object.

Keywords: selective waterproof compositions; limitation of water inflow; laboratory study; filtration tests; core; double-layer core models.

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UDC 622.276.66.002.34 DOI: 10.30713/0207-2351-2018-9-33-40

COMPLEX APPROACH TO LABORATORY TESTING MODELING OF BREAKDOWN FLUID (p. 33)

Nikolay Nikolaevich Barkovsky,

Sergey Anatolievich Kondratiev,

Alexey Maratovich Amirov,

Tatyana Vladimirovna Chabina,

Mikhail Vladimirovich Shmakov

"PermNIPIneft", a branch of LLC "LUKOIL−Engineering" in Perm

29, Sovetskaya Armiya str., Perm, 614066, Russian Federation,

e-mail: Nikolaj.Barkovskij@pnn.lukoil.com; Sergej.Kondratiev@pnn.lukoil.com, Aleksey.Amirov@pnn.lukoil.com; Tatjana.Chabina@pnn.lukoil.com; Mikhail.Shmakov@pnn.lukoil.com

Nowadays various methods of a formation stimulation are widely applied in oil and gas industry to enhance hydrocarbons production. One of the most effective methods of increasing wells productivity and oil recovery rates is hydraulic fracturing of a formation (HFF). HFF involves creation of highly permeable channels (a system of fractures) by injection of a fracturing fluid (breakdown fluid) under high pressure. To avoid fractures closure after the pressure relief, a proping agent (proppant, sand) together with the breakdown fluid is injected into the formation thus preventing healing of the fractures walls and preserving the fracture’s permeability at a rather high level for a long time [1]. The authors of the article discuss the approaches to laboratory testing of the breakdown fluid in a "free volume" and the results of conducted filtration tests including those where the natural rock and propping agents (proppants) were used.

Keywords: hydraulic fracturing of a formation; laboratory modeling; breakdown fluid; "free volume"; proping agent (propant); propant carrying capacity; filtration test; cell of conductivity; core slab; pressing of propant into the rock; restorationncoefficient.

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UDC 622.276.031.011.433:532.5 DOI: 10.30713/0207-2351-2018-9-41-47

EXPERIENCE OF USING TRACER STUDIES OF DIII FORMATION OF ZAPADNO-KOMMUNARSKOE
OILFIELD (p. 41)

Artur Edvardovich Manasyan¹, Cand. of tech. sci.,

Denis Vyacheslavovich Zhuravlev²,

Alexander Nikolaevich Kozlov^2,3, Cand. of biolog. sci.

¹JSC "Samaraneftegaz"

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

е-mail: sng@samng.ru

²LLC "SamaraNIPIneft"

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

e-mail: KirjanovaEV@samnipineft.ru

³Samara State Technical University

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

Based on the results of tracer tests, the presence of a hydrodynamic relations between the injection and production wells of DIII formation of the Zapadno-Kommunarskoe uplift was identified. The permeability and productivity of injected water filtration paths, the degree of influence of individual filtration paths on products water-flooding of producing wells are determined. The specific features of the formation filtration systems are revealed, including the presence of channels with abnormally high permeability.

Keywords: oilfield; tracer tests; hydrodynamic relations; filtration; permeability; inter-well space; water injection.

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UDC 622.276.1/.4:55 DOI: 10.30713/0207-2351-2018-9-48-52

ANALYSIS OF RISKS OF GEOLOGICAL PARAMETERS UNCERTAINTY IN CONDITIONS
OF POOR STUDY OF THE FIELD (p. 48)

Dmitriy Mikhaylovich Belyatsky,

Alexander Pavlovich Kovalenko, Cand. of tech. sci.,

Oleg Vladimirovich Novopashin,

Evgeniya Valerievna Raudanen

LLC "Tyumen Petroleum Research Center"

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

e-mail: dmbelyatskiy@tnnc.rosneft.ru; APKovalenko2@tnnc.rosneft.ru; ovnovopashin@tnnc.rosneft.ru; evraudanen@tnnc.rosneft.ru

The article deals with the application of probability-statistical methods for estimating the uncertainty of parameters that affect the bulk oil and gas reserves in a reservoir and the productivity of the wells. Special attention is paid to the multivariate calculations optimization of technological development indicators with account of geological parameters uncertainty risks.

Keywords: uncertainties; risks; zones of uncertainty; stocks; oil deposits; development scenarios; drilling.

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UDC 622.245 DOI: 10.30713/0207-2351-2018-9-53-56

HYDRODYNAMIC FACTORS CONSIDERATION WHEN ABANDONING OIL AND GAS WELLS (p. 53)

Alexander Ivanovich Nikonov, Cand. of geol.-mineral. sci.,

Mikhail Konstantinovich Tupysev, Cand. of tech. sci.

Oil and Gas Research Institute RAS

3, Gubkin str., Moscow, 119333, Russian Federation,

e-mail: eco_lab@ipng.ru

The article considers natural and technogenic factors that exert physical influence on a well construction elements and sealing materials when developing oil and gas fields. Non-accounting of these factors causes non-qualitative abandonment of wells. As a result, a well remains a dangerous technogenic object for a long time, which requires constant monitoring and financial costs. Due to this fact, at all stages of project documentation development, it is proposed to control and account of all geodynamic processes when projecting and development of fields with the purpose of a long-term wells abandonment.

Keywords: geodynamic processes; oil and gas field development; wells abandonment.

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UDC 622.276.72 DOI: 10.30713/0207-2351-2018-9-57-61

EXPERIENCE OF APPLICATION OF TECHNOLOGIES TO PREVENT CARBONATE DEPOSITS
FORMATION IN DEPTH-PUMPING EQUIPMENT OF PRODUCING WELLS IN THE FIELDS
OF TERRITORIAL PRODUCTION ENTERPRISE "LUKOIL–USINSKNEFTEGAZ" (p. 57)

Vladimir Anatolievich Martynov

Territorial Production Department (TPD) "LUKOIL–Usinskneftegaz" of LLC "LUKOIL−Komi"

4, Transportnaya str., Usinsk, 169710, Komi Republic, Russian Federation,

e-mail: Vladimir.A.Martynov@lukoil.com

Svetlana Konstantinovna Kim, Cand. of tech. sci.,

Dmitry Gennadievich Danilenko, Cand. of biol. sci.

"PermNIPIneft", a branch of LLC "LUKOIL−Engineering" in Perm

29, Sovetskaya Armiya str., Perm, 614066, Russian Federation

The article presents the methods that are applied to predict, to prevent and to liquidate scaling and sedimentation of oilfield equipment of producing wells at the fields of the TPD "LUKOIL−Usinskneftegaz". Some proposals on the formation of a comprehensive program for further work to combat scaling and to reduce the negative impact on the oil production process are given.

Keywords: formation water; wells stock; complications; carbonate salts; water saturation; minerals; samples; chemical composition; water compatibility.

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UDC 622.276.438:628.16.065 DOI: 10.30713/0207-2351-2018-9-62-66

RESULTS OF EXPERIMENTAL-FIELD TESTS OF WATER TREATMENT TECHNOLOGY
USING A TITANIUM COAGULANT (p. 62)

Konstantin Vladimirovich Andreev,

Tatiana Anatolievna Syur

"PermNIPIneft", a branch of LLC "LUKOIL−Engineering" in Perm

29, Sovetskaya Armiya str., Perm, 614066, Russian Federation,

e-mail: permnipineft@pnn.lukoil.com

The article presents the results of experimental-field tests of bottom water preparation technology of the preliminary water discharge unit (PWDU), using a titanium coagulant at one of the objects of LLC "LUKOIL−PERM". The technology provides deeper purification of injected water from oil and mechanical impurities as compared with the non-reagent cleaning methods (gravity sludge); it is also relevant in conditions of low-permeable reservoirs with a low injectivity of injection wells, due to contamination of the well bottom zone of the formation zone because of the injected water poor quality. The purified water quality meets regulatory requirements. Based on the summarized experience, the results of the tests make it possible to consider it as one of the advanced technologies for water purification in the units of preliminary water discharge and oil treatment.

Keywords: titanium coagulant; preparation of bottom water; water treatment technology.

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UDC 622.692.4.07(083.75) DOI: 10.30713/0207-2351-2018-9-67-73

SOME SPECIFIC FEATURES OF OFFSHORE PIPELINES CONSTRUCTION
IN THE ARCTIC CONDITIONS (p. 67)

V.M. Plotnikov, A.I. Polovnikova

Perm National Research Polytechnic University

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

e-mail: vmplotnikov@mail.com

This article is devoted to the comparative analysis of international and domestic design principles of submarine pipelines in the Arctic seas. Due to the great importance of development of offshore Arctic oil and gas deposits and promising development of these regions for the oil and gas industry of Russia, the urgency of this study related to the problem of improving the safety and efficiency of hydrocarbon fields development at the design stage and construction of the offshore pipeline transportation of oil and gas in the Arctic conditions is determined. The comparative analysis was made by comparing the results of strength calculation of a submarine offshore pipeline in the Arctic conditions, based on domestic and foreign techniques. The object of the research is the Barents Sea deposits as the most promising oil and gas area in modern conditions. The study focuses on the Shtokmanovskoye (Shtokman) gas-condensate field, located in the central part of the Barents Sea, being one of the largest fields in the world in view of its natural gas explored reserves. Resulting from the calculations made, the difference in the wall thickness values is obtained and the lack of the strength calculation methods, that accounts of the influence of icebergs keels’ static and dynamic loads on a submarine pipeline is revealed. A submarine pipeline’s wall thickness based on the theory of thin shells that accounts of the ovality appearance and bending stresses under the impact of icebergs on the pipeline is calculated by the method, suggested by S.V. Astafiev. The results of wall thickness calculations of a submarine pipeline with and without account of icebergs impact vary. Based on this fact, it can be concluded that, when calculating a submarine pipeline strength, safety design of offshore pipelines in the Arctic seas requires accounting of icebergs loads.

Keywords: sea; pipeline; the Arctic region; seabed; iceberg; ploughing; danger; design; strength; calculation.

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