Oilfield Engineering

The problem of light oil extraction from a reservoir the current pressure of which is below the saturation pressure is illustrated by the example of a field in the Volga-Ural oil and gas province. The sedimentary cover structure is complicated by a system of disjunctive faults and rocks decompression zones. Due to the manifestation of fault-block tectonics, a vertical hydrodynamic connection between the developed formations is possible, what reduces the effectiveness of the reservoir pressure maintenance system. Long-term development of the reservoir in the natural mode was accompanied by a decrease in the flow rates and wells shutoff. Gas release and pressure reduction in the reservoir volume contributed to oil viscosity increase, which is confirmed by calculations using the material balance model. The permeability decrease is caused by the deformations and mechanical destruction of the rock skeleton. To restore oil production levels, the measures on the reservoir additional opening are required. The development strategy choice may require reorganization of the reservoir pressure maintenance system and overcompensation, with account of the risk of inter-layer flows. Decision making should be based on the results of hydrodynamic and geophysical studies, the purpose of which is to evaluate the energy state of the reservoir, determine the degree of connection between the geological blocks and the current positions of the oil-water and gas-oil contacts.

Keywords: light oil reservoir; reservoir pressure; gas saturation pressure; material balance; rock softening; inter-layer overflow; hydraulic fracturing; water injection; overcompensation; lateral horizontal wellbore.

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UDC 622.276.031:532.11+622.276.031.011.433:532.5 DOI: 10.30713/0207-2351-2019-10(610)-13-17

EVALUATION OF A FORMATION ZONAL INHOMOGENEITY INFLUENCE ON THE FILTRATION FIELD AND INTERACTION OF WELLS BY USING A MAP OF PRESSURE GRADIENTS (p. 13)

Ilnur Ramilevich Safiullin

LLC NPO "Neftegaztekhnologiya"

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

e-mail: npongt@gmail.com

Oleg Petrovich Toropchin,

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

Evgeny Vladimirovich Kornev

LLC "BayTex"

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

Albina Sagitovna Belyaeva, Dr. of tech. sci.

JSC SPC "Geofizika"

2, Komsomolskaya str., Ufa, 450005, Republic of Bashkortostan, Russian Federation

The paper provides a technique providing the deep analysis of isobar maps by calculation of the spatial gradient parameter of the reservoir pressure. The map construction of this parameter distribution along the reservoir for a specific date provides estimation of the reservoir properties effect on the filtration field created by a network of production and injection wells. This information makes it possible to increase the quality of geological and technical measures aimed at waterflooding optimization and oil extraction intensification.

Keywords: reservoir pressure; maps of isobars; filtration field; oil recovery intensification.

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UDC 622.276.66.002.34 DOI: 10.30713/0207-2351-2019-10(610)-18-23

POLYMER-FREE VISCOSITY CONTROLLING AGENT (VISCOELASTIC SURFACTANT)
FOR ACID-PROPPANT FRACTURING (p. 18)

Anton Vitalievich Elsukov, PhD, Deputy R&D director on New products,

Anatoly Ivanovich Shipilov, PhD, R&D director,

Evgeny Valerievich Krutikhin, PhD, Head of laboratory,

Natalia Valerievna Babkina, PhD, Chief of colloidal and physical chemistry section,

Dariya Vyacheslavna Nikolaeva, Chemist-analyst

Polyex JSC

8, Office 301, Galperin str., Perm, 614042, Russian Federation,

e-mail: ais@polyex.perm.ru; ave@polyex.perm.ru; kev@polyex.perm.ru; bnv@polyex.perm.ru; ndv@polyex.perm.ru

The article is devoted to one of the promising areas of the development of acidic treatment of the reservoir, namely acid fracturing of formation (acid fracturing). The study of the properties of gelled acid was performed with providing the required proppant carrying ability for fracturing fluid through the use of non-polymeric non clogging viscoelastic surfactant (VES). Adding of VES into acid fracturing fluid allows to control easily and to vary in a simple way the viscosity of the acid fluid and its ability to transport proppant within wide limits. This acid system is offered as technologically more simple and more effective alternative to a complex multi-stage injection of various fluids during acid-proppant fracturing.

Keywords: acid-proppant fracturing of formation; gelled acids; viscoelastic surfactant; rheology; proppant carrying ability.

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UDC 622.276.65-97 DOI: 10.30713/0207-2351-2019-10(610)-24-27

IMPROVEMENT OF THE METHODS OF THERMOGASOCHEMICAL IMPACT ON A BOTTOMHOLE FORMATION ZONE IN THE DEPOSITS WITH HARD-TO-RECOVER RESERVES (p. 24)

Rinat Raisovich Khuzin, Dr. of tech. sci.,

Dinar Albertovich Salikhov

LLC "Karbon-Oil"

POB 427, Almetyevsk-2, 423450, Republic of Tatarstan, Russian Federation,

e-mail: karbon@tatais.ru

Vadim Evgenievich Andreev, Dr. of tech. sci., Professor,

Institute of Strategic Studies of the Republic of Bashkortostan

15, Kirov str., Ufa, 450008, Republic of Bashkortostan, Russian Federation.

When producing oil from the fields with hard-to-recover reserves, their still remains the problem of decreasing the reservoir temperature, while the density and viscosity of oil increase. As a result, it leads to a significant decrease of a well productivity. One of the thermal methods for influencing the bottom-hole formation zone is thermal-gaseous-chemical effect (ThGChE). The disadvantages of this method technology are a short thermal effect, insufficient temperature at the combustion front and high detonation ability. An improved ThGChE technology was proposed that significantly increases the processing efficiency. Examples of the practical implementation of this method in small oil companies and PJSC "Tatneft" are given.

Keywords: hard-to-recover reserves; thermal-gaseous-chemical effect (ThGChE); bottom hole formation zone; asphalt-resin-paraffin deposits.

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UDC 622.276.64 DOI: 10.30713/0207-2351-2019-10(610)-28-31

RESEARCHING THE METHOD OF INCREASING OIL RESERVOIR RECOVERY WITH THE USE
OF THE FLOW-REGULATING COMPOSITIONS (p. 28)

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

Damir Midkhatovich Sakhipov^3,4,

Igor Aleksandrovich Kruglov³

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

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

e-mail: musakaev@ikz.ru

²Industrial University of Tyumen

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

³RPC "Jahmir"

27, Taezhnaya str., Nizhnevartovsk, 628611, Tyumen region, Khanty-Mansi autonomous territory − Yugra, Russian Federation,

e-mail: jahmir@bk.ru

⁴Branch of Industrial University of Tyumen in the city of Nizhnevartovsk

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

For the Samotlor field development conditions experimental studies of influence of the filtrate of a polymer clay-quartz composition (PCQC) on the reservoir permeability with the subsequent reconditioning of the permeability coefficient are carried out. Laboratory tests were conduct using the back-washing method with a water-based control salt solution in conditions that simulate reservoir. On the base of this experimental studies it was conclude that can be recommend the possibility of using the patented solute PCQC on the wells with high and low permeability of the productive layer, taking into account that this layer can be disturbed by natural and artificial fractures.

Keywords: wellbottom zone; filtration-capacity properties; experimental research.

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UDC 622.276.652 DOI: 10.30713/0207-2351-2019-10(610)-32-36

OPTIMIZATION OF HORIZONTAL WELL PARAMETERS FOR STEAM AND GRAVITY
DRAINAGE TECHNOLOGY BASED ON NUMERICAL SIMULATION (p. 32)

Artur Rinatovich Musin,

Andrey Valerievich Osipov, Cand. of tech. sci.,

Stanislav Anatolievich Zhdanov, Dr. of tech. sci.

VNIIneft JSC

10, Dmitrovskiy proezd, Moscow, 127422, Russian Federation,

e-mail: amusin@vniineft.ru; aosipov@vniineft.ru; jdanov@vniineft.ru

As the development of reserves of traditional oil takes place, high-viscosity oil and natural bitumen are becoming an important component of the resource base.

Despite significant costs for the development of fields that contain high-viscosity oil and natural bitumen, the demand for this strategically significant raw material in the world is increasing.

This paper is devoted to optimizing the length of the horizontal section of a well during steam and gravity drainage of a reservoir based on numerical modeling in a carbonate reservoir of one of the fields of high-viscosity oil of the Caribbean Basin and finding, using a regression analysis, an analytical dependence of the technological characteristics on the well operation parameters.

The solution of the assigned tasks was carried out using the thermohydrodynamic simulator CMG STAR (Computer Modeling Group).

The paper discusses the geological and physical characteristics of the field, gives the results of calculations to determine the optimal steam injection rate for different lengths of the horizontal wellbore, the optimal length of horizontal wells, and also provides an analytical dependence of the technological characteristics of the well operation parameters.

Keywords: hydrodynamic modeling; steam and gravity drainage; high viscosity oil; horizontal wells.

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UDC 622.245.42:622.248.3 DOI: 10.30713/0207-2351-2019-10(610)-37-42

THE OCCURRENCE OF FLUID CONDUCTING CHANNELS IN THE CEMENTED WELL SPACE (p. 37)

Ramiz Alievich Gasumov, Dr. of tech. sci., Professor,

Irina Leonidovna Osadchaya, Cand. of tech. sci.

JSC "North-Caucasus Scientific-Research Design Institute of Natural Gases"

419, Lenin str., Stavropol, 355035, Russian Federation,

e-mail: svnipigz@gazprom.ru

Eldar Ramizovich Gasumov, Cand. of econ. sci.

Azerbaijan State University of Oil and Industry

20, Azadlyg prosp., AZ1010, Baku, Republic of Azerbaijan,

e-mail: R.Gasumov@yandex.ru

Ivan Mitrofanovich Pershin, Dr. of tech. sci., Professor

Pyatigorsk branch of the North-Caucasus Federal University

56, prosp. 40 years of October, Pyatigorsk, 357500, Russian Federation,

e-mail: ivmp@yandex.ru

The paper discusses the identified causes of behind-the-casing flow occurrences when cementing deep wells in difficult geological conditions, presents the results of a study of various factors influence on cement stone tightness; the influence of geological and physical-chemical factors on the occurence of fluid conductive channels in the cement stone during its hardening is analyzed.

Keywords: well; cementing; cement mortar; cement stone; drilling mud; gas saturation; reservoir pressure; behind-the-casing flow occurrences; fluid conducting channels.

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UDC 622.243 DOI: 10.30713/0207-2351-2019-10(610)-43-46

EXPERIENCE OF THE TECHNOLOGY APPLIED TO LOWER A CASING STRING
WITH FURTHER REAMING AND PROSPECTS FOR DEVELOPMENT (p. 43)

Denis Sergeevich Loparev,

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

Denis Ravilievich Molokanov, Cand. of tech. sci.,

Artem Vladimirovich Levin

LUKOIL−Engineering Limited PermNIPIneft Branch Office in Perm

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

e-mail: denis.loparev@pnn.lukoil.com; natalya.deminskaya@pnn.lukoil.com; drmolokanov@pnn.lukoil.com; Artem.Levin@pnn.lukoil.com

Currently, at a number of fields there are problems with the stability of the wellbore, solution of which requires significant time spent on a wellbore preparation for a casing string lowering. A set of measures undertaken to prepare a casing string lowering usually includes adjustment of the drilling fluid rheological parameters, increase of its inhibitory ability and additional wellbore reaming. A real, cost and time effective alternative technology applied for a casing string lowering in a complicated wellbore is the one that provides the technology of the casing string lowering with reaming.

The paper describes the experience of successful application of casing running technology with reaming at the fields of Denisovskoye license site for various threaded casing joints and recommendations on the application of this technology. The main technological effect of the application of the technology with reaming is achieved by reducing the time for a wellbore and a casing string lowering.

As a further prospect for the development of the lowering technology with rotation, the technology of casing drilling is considered. Casing drilling can be carried out by almost all rigs equipped with a top drive. And the experience in a casing string running with reaming proved the possibility of using casing strings with standard threaded joints together with special high-torque rings.

Keywords: casing string; lowering with reaming; moment-raising rings; drill shoe; threaded joints; torque.

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УДК 622.276.5.05.001.41 DOI: 10.30713/0207-2351-2019-10(610)-47-52

NEW APPROACHES TO BENCH TESTS OF IN-WELL FILTERS IN THERMOBARIC CONDITIONS
ON THE EXAMPLE OF THE YAREG DEPOSIT (p. 47)

Gennady Vladimirovich Okromelidze, Cand. of tech. sci.,

Denis Sergeevich Loparev,

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

Denis Ravilievich Molokanov, Cand. of tech. sci.

LUKOIL−Engineering Limited PermNIPIneft Branch Office in Perm

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

e-mail: Gennadij.Okromelidze@pnn.lukoil.com; denis.loparev@pnn.lukoil.com; natalya.deminskaya@pnn.lukoil.com; drmolokanov@pnn.lukoil.com;

Viktor Vadimovich Kobernik

LLC "TatProm−Kholding"

58, Avtosborochny proezd, Naberezhnye Chelny, 423800, Republic of Tatarstan, Russian Federation,

e-mail: v.kobernik@tatpromfilter.ru

Valery Anatolievich Kuzin,

Sergey Valerievich Shvets

LLC "LUKOIL−Komi"

31, Neftyanikov str., Usinsk, 169710, Republic of Komi, Russian Federation,

e-mail: Valeriy.A.Kuzin@lukoil.com; sergey.shvets@lukoil.com

During the horizontal well operation in the Liaelskaya area of the Yarega oil field, a significant number of cases of submersible equipment failure due to the high content of mechanical impurities were noted. The main specific features of these wells operation are the high viscosity of the reservoir oil and the temperature effect on the reservoir.

To solve this problem, a test-bed design and a technique for conducting simultaneous comparative tests of four well filters were developed. The paper describes the experience of conducting simultaneous bench tests of four variously designed well filters in conditions that are closest to the well ones. The main goal of bench testing was to evaluate the performance of the efficiency of variously designed well filters under conditions close to the operating conditions of SAGD wells, namely, the speed and quality of filtration.

The bench test results showed that a filter with gravel packing between two wire screens is 7...15 times more effective in filtrate cleaning as compared with a basic filter with slit laser perforation additionally provides a higher filtration rate of highly viscous oil.

Keywords: bench tests; well filters; gravel packing; Steam Assisted Gravity Drainage (SAGD); mechanical impurities; Yarega field.

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UDC 622.276.5.05-52 DOI: 10.30713/0207-2351-2019-10(610)-53-59

PERFORMANCE ANALYSIS OF A SET OF EQUIPMENT FOR GAS EXTRACTION (p. 53)

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

Rustam Almasovich Khakimov,

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

The article provides information on the performance analysis of the KOGS-1 type set of equipment for pumping a gas out of the annular space. It was determined that gas transfer by a compressor is low and amounts to 9,5 %. The main repair works and the ways to eliminate breakdowns are described in detail, such as breakage of the valve plates of the compressor heads and the failure of the compressor heads, as well as oil blow-by from the crankcase into the exhaust pipes of the compressor heads. The breakage of valves can lead to particularly serious consequences. It has been determined that there is no direct dependence of the valve plates breakage on the operation parameters of wells and the KOGS installation. Recommendations on improving the design of the KOGS compressor and increasing its overall life are given.

Keywords: set of equipment for evacuation of the wellbore annulus; gas extraction; plates; engine hours; compressor head; crankcase; cylinder; piston.

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UDC 622.276.53.054.004.5+622.276.72 DOI: 10.30713/0207-2351-2019-10(610)-60-64

TECHNICAL DESIGN OF DEEP PUMPING EQUIPMENT FOR WELLS
WITH ASPHALT-RESIN-PARAFFINE DEPOSITS (p. 60)

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

Aliya Ildarovna Denislamova,

Liliya Rustamovna Galimova,

Zinnat Anverovich Maksutov

Ufa State Petroleum Technological University

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

e-mail: denislamoviz@mail.ru

Artur Maratovich Galimov, Cand. of tech. sci.,

LLC "Bashneft–Dobycha"

30, Karl Marks str., Ufa, 450077, Republic of Bashkortostan, Russian Federation

The formation of asphalt-resin-paraffin deposits (ARPD) on the inner surface of downhole pumps and tubing strings is a natural process in oil production, which occurs due to a temperature decrease of the oil, being lifted, and the release of the dissolved associated petroleum gas from it. An important role in this process is played by the produced oil composition, including heavy components: asphaltenes, resins and paraffins. The share of hard-to-recover oil, in particular, high-viscous oil in the produced oil composition, will in future only grow, that’s why, the number of wells complicated by the presence of asphaltenes, resins and paraffins deposits will also increase. Currently, wells with ARPD in some fields make 42 ... 59 % of the total stock of oil producing wells. It will be natural to assume that such complicated wells should have additional equipment to ensure the operation of downhole pumping equipment for a long time. According to most researchers and producing companies, a tube for supplying reagent into a well is an effective way to prevent and combat ARP depositions in oil producing wells. The paper considers the most optimal position of the reagent tube in a well.

Keywords: reagent tube; inter-tube space; check valve; electric centrifugal pump; pressure; organic solvent; container.

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UDC 622.276.72 DOI: 10.30713/0207-2351-2019-10(610)-65-78

THE PROBLEM OF HALITE DEPOSITS IN HIGHLY MINERALIZED ENVIRONMENTS:
CAUSES, MECHANISM, CONTROL (p. 65)

Iliya Vladimirovich Valekzhanin,

Emil Robertovich Ishmiyarov,

Alexander Yurievich Presnyakov,

Azat Rifovich Garifullin,

Alexander Iosifovich Voloshin, Dr. of chemical sci.

LLC "RN−BashNIPIneft"

86/1, Lenin str., Ufa, 450006, Republic of Bashkortostan, Russian Federation,

e-mail: ValekzhaninIV@bnipi.rosneft.ru; IshmiyarovER@bnipi.rosneft.ru; PresnyakovAU@bnipi.rosneft.ru; ARGarifullin@bnipi.rosneft.ru; VoloshinAI@bnipi.rosneft.ru

The causes of the formation and deposition of halite (sodium chloride, NaCl) during oil production are considered. The mechanism of halite formation is described, the influence of the active principles of the most common inhibitors of hydrates formation (methanol, monoethylene glycol, triethylene glycol) on the process of halite formation is considered. The successful technological methods for managing the problem of halite formation are reviewed. Particular attention is paid to halite inhibitors. Information is given on the available reagents that are used in the global oil industry as an inhibitor of halite deposits. Their effectiveness, technological and economic limitations are shown. The issues of laboratory testing of halite formation inhibitors are considered.

Keywords: halite; sodium chloride; highly mineralized media; removal; inhibition; laboratory testing.

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