Oilfield Engineering

This paper presents the results of the implementation of the targeted program of activities at the injection well stock in order to achieve optimal compensation for the production wells in conditions of the formations clinoform structure using the example of BV7 site of Yuzhno-Vyintoyskoye field. Regulation of injection wells operating modes was carried out on the basis of the previously developed algorithm for determining of the required volume of water injection. Improvement of the efficiency of the formed development system lies in determining the individual operating modes of injection wells.

Keywords: optimal injectivity; optimization of the water flooding system; compensation of selections on the area; clinoform structure.

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UDC 622.276.432 DOI: 10.30713/0207-2351-2019-4(604)-8-12

AN INTEGRATED APPROACH TO DEVELOPMENT OF A PROGRAM OF MEASURES
FOR LEVELLING THE INJECTIVITY PROFILE OF INJECTION WELLS
ON THE EXAMPLE OF PJSC "ORENBURGNEFT" FIELD (p. 8)

Vladimir Nikolaevich Kozhin, Cand. of tech. sci.,

Elena Viktorovna Sergeeva,

Vitaly Gennadievich Cherepanov

LLC "SamaraNIPIneft"

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

e-mail: SergeevaEV@samnipineft.ru

Denis Vyacheslavovich Ryabushkin,

Evgeny Yurievich Ronzhin

PJSC "Orenburgneft"

2, Magistralnaya str., Buzuluk, 461040, Orenburg region, Russian Federation,

e-mail: orenburgneft@rosneft.ru

An integrated approach including tracer analysis, geophysical and laboratory studies when selecting wells-candidates for injectivity profile levelling is presented. The results of the conducted integrated analysis are accounted of when implementing the measures. The technological efficiency is evaluated.

Keywords: injectivity profile levelling; tracer analysis; optimization of a reservoir pressure maintenance (RPM) system; additional oil production; water inflow control.

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UDC 622.276.43 DOI: 10.30713/0207-2351-2019-4(604)-13-18

ANALYSIS OF WATER INJECTION INFLUENCE ON THE EXTRACTION OF OIL PRODUCTION FROM
THE TULA AND THE TOURNAISIAN STAGE DEPOSITS OF SOSNOVSKY GAS-OIL FIELD (p. 13)

Vladislav Ignatievich Galkin, Dr. of geol.-miner. sci., Professor

Perm National Research Polytechnic University

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

e-mail: vgalkin@pstu.ru

Alexander Pavlovich Fadeev

LUKOIL−Engineering Limited PermNIPIneft Branch Office in Perm

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

e-mail: Aleksandr.Fadeev@pnn.lukoil.com

The influence of water injection into a reservoir on oil production for the Tournaisian carbonate and Tula terrigenous sediments of Sosnovsky gas-oil field is analyzed. The analysis is based on application of statistical methods such as correlation and regression ones. According to the data of monthly and accumulated oil production as well as monthly and accumulated water injection into the productive reservoir, the assessment of the impact of monthly water injection into the reservoir on the monthly oil production was studied. The study includes the assumption that the injection well affects only the nearby producing wells. The absence of correlation dependence between the parameters of monthly injection and monthly oil production was proved. Further on, to assess the water injection efficiency into the reservoir, a decision was made to use the data from the accumulated volume of water injection and oil production. The results of the assessment of water injection effect on oil production show that water injection into a reservoir differently influences various development objects. It is revealed that constant water injection in the Tournaissian deposits allows recovery of reserves in the regions that are located far away from the injection well. In Tula deposits, water injection into the reservoir is effective only in cyclic mode, since when changing the injection mode to a constant one, the efficiency of all wells, regardless of production and location, decreased significantly. The paper proves the fact that each development object requires implementation of its own mode of water pumping into the reservoir according to geological conditions.

Keywords: field; oil production; water injection; production well; injection well; correlation coefficient; regression equation; recovery of reserves; reservoir pressure maintenance (RPM) system.

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UDC 622.276 DOI: 10.30713/0207-2351-2019-4(604)-19-22

INTEGRATED APPROACH TO OIL PRODUCTION OPTIMIZATION AT THE DEPOSITS
OF LLC "LUKOIL–PERM" (p. 19)

Elizaveta Viktorovna Soboleva

LLC "LUKOIL−PERM"

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

e-mail: Lizi.89@inbox.ru

The article discusses the limitations when planning oil production optimization by wells. A comprehensive approach to planning optimization in fields by applying a built-in integrated model is proposed. The implementation of this approach can improve the quality of decision-making.

Keywords: optimization; layer; well; well bottom pressure; hydrodynamic model; integrated model.

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UDC 622.276.66.002 DOI: 10.30713/0207-2351-2019-4(604)-23-30

SOME SPECIFIC FEATURES OF Ach6 SITE DEVELOPMENT OF IMILORSKOYE DEPOSIT USING
THE TECHNOLOGIES OF A MULTI-STAGE HYDRAULIC FRACTURING OF
A FORMATION (MSHFF). PROBLEMS AND TECHNOLOGY SOLUTIONS (p. 23)

Alexander Valerievich Bukharov,

Evgeny Nikolaevich Malshakov,

Nikolay Vladimirovich Boldenko,

Valentina Ilinichna Shalamova,

Andrey Valerievich Kuznetsov,

Egor Viktorovich Shkandratov

LUKOIL–Engineering Limited KogalymNIPIneft Branch Office in Tyumen

143а, Respublika str., Tyumen, 625000, Tyumen region, Russian Federation,

e-mail: BuharovAV@tmn.lukoil.com; MalshakovEN@tmn.lukoil.com; BoldenkoNV@tmn.lukoil.com; ShalamovaVI@tmn.lukoil.com; KuznetsovAV@tmn.lukoil.com; ShkandratovEV@tmn.lukoil.com

Based on the successful experience of carrying out a two-stage hydraulic fracturing of formations (HFF) at various fields of LLC "LUKOIL–Western Siberia" and the theory of fracture reorientation during the repeated HFF, the idea of increasing the number of stages per an exposure interval has been proposed. The principle of the proposed technology to be implemented at Аch6 site lies in alternately carrying out of two- and three-stage hydraulic fracturing of a formation for each interval of impact of the wellbore horizontal part, thus allowing to get a network of cracks in aggregate and thereby multiply increase the coverage and the area of drainage. The results of the first well operation showed that this method of impact on the formation has a significantly greater potential relative to standard fracturing approaches.

Keywords: two- and three-stage hydraulic fracturing of a formation; crack reorientation; hard-to-recover reserves (HRR); horizontal section; high rates of fluid flow-rate decrease.

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UDC 622.276.63 DOI: 10.30713/0207-2351-2019-4(604)-31-35

EXPERIENCE OF CARBON DIOXIDE INDUSTRIAL USE TO INTENSIFY OIL REPLACEMENT
IN RESERVOIR CONDITIONS (p. 31)

Nail Ismagzamovich Khisamutdinov, Dr. of tech. sci.,

Almaz Aksanovich Makhmutov, Cand. of tech. sci.,

Inna Shamilevna Shchekaturova, Cand. of tech. sci.

LLC NPO "Neftegaztekhnologiya"

96/2, Revolutsionnaya str., Ufa, 450078, Republic of Bashkortostan, Russian Federation,

e-mail: npongt@gmail.com

Andrey Mikhailovich Tupitsin, Cand. of tech. sci.,

Artem Borisovich Yankin

LLC "BayTex"

51, Leningradskaya str., Buguruslan, 461630, Orenburg region, Russian Federation,

e-mail: ATupitsin@rus.mol.hu

The article discusses some specific features of carbon dioxide formation under formation conditions as a result of a large-volume well treatment by hydrochloric acid. The dependence of the decrease the oil viscosity produced from B1 reservoir of Baituganskoye deposit with different concentrations of CO2 has been obtained and the effect of thermobaric factors has been studied. A technology that combines the advantages of cyclic effect on the reservoir and the intra-reservoir carbonized water formation by conducting periodic hydrochloric-acid treatments is proposed. The technological efficiency of this technology, depending on the concentration of hydrochloric acid, can reach 55 %, thus brining 101,6 million rubles increase of the accumulated net discounted income.

Keywords: hydrochloric acid; carbon dioxide; displacement coefficient; oil viscosity; efficiency; growth.

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UDC 622.276.6 DOI: 10.30713/0207-2351-2019-4(604)-36-40

ACCOUNTING OF WELLS INTERFERENCE WHEN ESTIMATING THE EFFICIENCY
OF DIFFERENT MEASURES OF PRODUCTION ENHANCEMENT (p. 36)

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

"TatNIPIneft" of PJSC "Tatneft" named after V.D. Shashin

32, M. Jalil str., Bugulma, 423230, Republic of Tatarstan, Russian Federation,

e-mail: iktissanov@tatnipi.ru

When implementing measures to stimulate the bottom hole zone of wells, creating hydraulic fractures, tightening of wells network, constructing wells with a wellbore complex configuration, optimizing e well bottom pressures, etc., the effect of the measures is calculated by a well. At the same time, the main object with which the oil producers work is a deposit. That’s why, the effect, produced by all these activities should be calculated for a deposit or its site. To do this, it is necessary to account of the interaction or interference of wells. To solve this problem, the simulation was performed on the hydrodynamic simulator and calculations were carried out by using the developed model for a single-phase steady-state filtration. It is shown that the deposit’s or its site’s real production increase is lower than the well’s increase in production, herewith, the lack of interference accounting can cause several times overestimation of the effect, especially for a dense network of wells.

The influence of the interference for vertical and horizontal wells is studied and the formulas for an approximate accounting of this factor are proposed. The results of the work are important when planning the effect of various measures aimed at oil production enhancement, calculation of the economic effect of the measures taken and evaluation of various technologies effectiveness.

Keywords: interference; well; efficiency evaluation; well flow-rate; total flow-rate of the site.

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UDC 622.276.652 DOI: 10.30713/0207-2351-2019-4(604)-41-44

CALCULATION OF THE THERMAL INFLUENCE EFFECTIVENESS
ON AN OIL-SATURATED RESERVOIR (p. 41)

Nail Gabsalyamovich Musakaev^1,2, Dr. of phys.-math. sci.,

Stanislav Leonidovich Borodin¹, Cand. of phys.-math. sci.,

Denis Sergeevich Belskikh^1,3

¹Tyumen Branch of Khristianovich Institute of Theoretical and Applied Mechanics SB RAS

74, Taymyrskaya str., Tyumen, 625026, Russian Federation,

e-mail: borodin@ikz.ru

²Industrial University of Tyumen

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

³Tyumen State University

6, Volodarsky str., Tyumen, 625003, Russian Federation

Numerical research of hot water-flooding efficiency using a heat margin is carried out. Influence of various parameters (volumetric consumption and the temperature of the water injected into a reservoir, efficiency factor of the water heating installation – injection wel system, a reservoir porosity) on the additionally obtained volumetric oil consumption (minus conditionally used oil for the hot water heating with account of the well-known efficiency factor) was carried out. It is shown that the dependence of the volume of the additionally obtained oil on the volumetric consumption of the injected water is nonmonotonic. It is established that the positive effect of the heat margin method is observed only under certain values of the reservoir porosity and the efficiency factor of the water heating installation − injection well system.

Keywords: thermal influence on a reservoir; heat-transfer agent; effectiveness of the influence.

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UDC 622.276.53.054.22 DOI: 10.30713/0207-2351-2019-4(604)-45-53

LIFTING OF WELLS PRODUCTS THROUGH PRODUCTION CASING STRINGS
IN SMALL-DIAMETER OIL PRODUCING WELLS (p. 45)

Konstantin Vladimirovich Valovsky, Dr. of tech. sci.,

Georgy Yurievich Basos, Cand. of tech. sci.,

Vladimir Mikhailovich Valovsky, Dr. of tech. sci.,

Bulat Foatovich Zairov,

Dmitry Viktorovich Bragin

"TatNIPIneft" of PJSC "Tatneft" named after V.D. Shashin

32, M. Jalil str., Bugulma, 423230, Republic of Tatarstan, Russian Federation,

e-mail: kvalovsky@tatnipi.ru

To reduce costs, JSC "Tatneft" drills wells using 114 or 102-mm casing strings. The analysis of use of sucker-rod pumping units providing lifting of wells products through the production casing string in small-diameter wells of Aksubaevo-Mokshinskoe and Vishnevo-Polyanskoye oil fields is presented. Advantages and disadvantages of the pumping unit with the sucker-rod pumps fixing in the anchor packer and the special bushing inside the production casing string as well as the pumping unit designed in "TatNIPIneft" involving downhole equipment landing on the well bottom and a self-sealing packer, mounted in the well within a single trip on the tubing string is considered. It is noted that growing water flooding of wells products increases the risks of high-viscous water/oil emulsions formation. The paper outlines perspectivity of sucker-rod pumps use in small-diameter wells with products lifting through the production casing string, particularly, developed by "TatNIPIneft", with a forced-opened delivery valve in water-flooded wells together with low-speed chain drives of downhole sucker-rod pumping units of small load capacity with an extended stroke length.

Keywords: small-diameter wells; downhole sucker-rod pump; product lifting; production casing string; variants of a pumping unit design; packer; cups; operational capabilities; water-oil emulsion.

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UDC 622.276.72.05; 620.197.3 DOI: 10.30713/0207-2351-2019-4(604)-54-59

EXPERIENCE OF INTERNALLY COATED TUBING USE FOR PREVENTION
OF ASPHALT-RESIN-PARAFFIN DEPOSITS (p. 54)

Alexander Valerievich Brikov

JSC "Neftegazholding"

1, Arbatskaya ploshchad, Moscow, 119019, Russian Federation,

e-mail: alex_v_brikov@list.ru

Andrey Nikolaevich Markin, Cand. of tech. sci.

Nizhnevartovsk branch of Federal State Budget Educational Institution of Higher Education "Industrial University of Tyumen"

2/P, bld. 9, Panel 20, Lenin str., Zapadny promyshlenny yzel, Nizhnevartovsk, 628616, Tyumen region, Khanty-Mansi autonomous territory − Yugra,

e-mail: Andrey.N.Markine@gmail.com

The paper provides the results of pilot testing of internally coated tubing carried out to prevent asphalt-resin-paraffin deposition (ARPD). It is shown that interval of mechanical wax removal frequency for different types of coating decreases by 2…20 times. Economic efficiency of wax inhibitor use is compared with the use of internally coated tubing.

Keywords: asphalt-resin-paraffin deposits (ARPD); internally coated tubing; paraffines; paraffines deposition inhibitors (PDI).

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UDC 622.279.72 DOI: 10.30713/0207-2351-2019-4(604)-60-65

TO THE PROBLEM OF CHOOSING THE METHODS OF CALCULATION
OF THE FORMATION CONDITIONS OF HYDRATES OF THE I AND II TYPES
IN THE "Aspen HYSYS" SOFTWARE (p. 60)

Andrey Aleksandrovich Zobnin,

Lidiya Eduardovna Titova,

Daniil Valerievich Polyansky

LLC "Tyumen Petroleum Research Center"

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

e-mail: avivanova@tnnc.rosneft.ru

The article deals with the problem of convergence of experimental and calculated thermobaric conditions for hydrates formation; obtained using the methods of "Aspen HYSYS" software and gives recommendations on the fields of their application.

Keywords: gas hydrates; accuracy of calculation of hydrates formation conditions; phase diagrams of hydrates formation.

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UDC 622.276.72 DOI: 10.30713/0207-2351-2019-4(604)-66-69

EFFICIENCY OF SALT DEPOSITION PREVENTION USING AN INHIBITING COMPOSITION
IN LABORATORY CONDITIONS (p. 66)

G.R. Gurbanov,

M.B. Adygezalova,

S.M. Pashaeva

Azerbaijan State University of Oil and Industry

20, Azadlyg pr., Baku, AZ 1010, Republic of Azerbaijan,

e-mail: ebikib@mail.ru

N.A. Abdullaeva

Scientific-Research Institute "Geotechnological Problems of Oil, Gas and Chemistry"

227, D. Aliev str., Baku, AZ1010, Republic of Azerbaijan

Currently, a complicating factor in the processes of oil production and wells drilling is complex salt deposits formation in the well bottom zone of a reservoir, wells equipment, systems of oil collection, transportation and preparation. The paper discusses the results of laboratory studies of the most effective inhibiting composition of salt deposits complex composition applying the model of the reservoir water from Surakhany field.

The process of scaling on metals surfaces of was investigated in laboratory conditions by visual determination of the amount and nature of salt deposits on metal samples after the model medium evaporation. It is established that the protective effect of various compositions of the salting inhibiting compositions makes 90...100 %.

Filtration studies were performed to determine the adsorption-desorption characteristics of the inhibiting compositions under investigation. Comparing the relative concentrations of reagents during adsorption, allowed concluding that adsorption proceeds faster with the use of inhibiting compounds K-1 and K-2. More uniform adsorption was observed in K-2 composition. The developed K-1 and K-2 compositions have approximately 1,5 times longer inhibition of scaling as compared to K-3 composition.

Keywords: scaling; inhibitors; testing; inhibition efficiency; complication; well; mineral salts; inhibiting composition.

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