Construction of Oil and Gas Wells on Land and Sea

In case of presence of thick layers of uniform permeability, it is advisable to use drilling technology by means of non-oriented assemblies in the mode of a drill string rotation. The paper presents calculations and recommendations for the use of assemblies with two centralizers in a horizontal formation. The recommended assemblies were tested for resistance to changes in well conditions, and the allowable deflection between centralizers was calculated.

Keywords: horizontal section of a well; non-oriented assembly; centralizer; assembly stability; assembly deflection.

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UDC 622.24(031) DOI: 10.33285/0130-3872-2021-3(339)-10-14

EXPERIMENTAL STUDY OF THE ANNULUS TIGHTNESS VIOLATION
WHEN DRILLING OUT CEMENT STONE AND CASING STRINGS EQUIPPING
(p. 10)

Daniel Edem Tsikplonu, post-graduate student,

Mikhail Vladimirovich Dvoinikov, Dr. of tech. sci., Head of the Department,

Christian Qwesy Jivornu, magister

Saint Petersburg Mining University

2, Line 21, Vasilievsky ostrov, St. Petersburg, 199106, Russian Federation,

e-mail: e_danyl@mail.ru, dvoinik72@gmail.com, chrisbillions@ymail.com

During the entire operational life-time of a well, the reliability of the support plays an important role in ensuring the normal production of hydrocarbons. Violation of the cement stone integrity can manifest itself both during the operation of a well and at the stages of its construction. At the moment, there are several ways of wells rotary drilling, depending on their purpose, geological conditions and technical and technological means used in the process of drilling. For example, rotary drilling accounts for over than 50 % of the total well construction. As you know, it is carried out by a drill string rotation, the load transfer to the bit with the subsequent destruction of the rock. It should be noted that in most cases, the tightness of the support is violated as a result of the impact of critical transverse shock pulses of a drill string (DS) arising in case of its misaligned rotation against the inner cavity of the casing pipes. As a result of a drill string’s torsional vibrations occurrence and the dynamics of the rock-cutting tool operation, local shock loads arise, causing a breach of the casing strings’ threaded connections tightness and the integrity of the cement stone. The destruction of the support is one of the reasons for the occurrence of inter-strata cross-flows and the formation of inter-annular pressures, resulting in a reduction of the well operational life-time.

The paper discusses the problem of impact of lateral beats of the BHA on the cement stone state. A stand is presented that allows determining the critical range of vibration accelerations due to the dynamic contact of the drilling tool with the casing string, leading to a violation of the well support tightness.

Keywords: cement mortar; vibration; casing string; impact strength of the cement stone.

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UDC 622.276 DOI: 10.33285/0130-3872-2021-3(339)-15-19

ANALYSIS OF THE RESULTS OF FIELD TESTS AND TRIAL OPERATION
OF "ULTRAFLOU" MULTIPHASE FLOW METERS IN THE FIELDS
OF LLC "LUKOIL-PERM" (p. 15)

Alexander Vladimirovich Toksubaev, Head of the Department,

Olesya Andreevna Chepkasova, engineer,

Maxim Maximovich Tyaktev, assistant of the Project Chief Engineer

LUKOIL-Engineering, PermNIPIneft Branch Office in Perm

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

Dmitry Igorevich Shishlyannikov, Cand. of tech. sci., associate professor

Perm National Research Polytechnic University

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

e-mail: dish844@gmail.com

The features of the design and operation of devices used for accounting for produced oil in the fields of Russia are considered. The use of traditional automated group metering units is characterized by big operating costs and significant errors in measuring the quantity and parameters of the produced well fluid. The paper proves the fact that the use of multiphase ultrasonic flow meters is promising. The results of field tests and pilot operation of "ULTRAFLOU" multiphase flow meters at the fields of LLC "LUKOIL-PERM" are shown, the prospects of their use and widespread introduction at enterprises in Russia and the CIS are presented.

Keywords: multiphase ultrasonic flow meter; accounting for oil in the field; comparative tests; trial operation.

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UDC 622.245.3 DOI: 10.33285/0130-3872-2021-3(339)-20-27

EXPERIENCE OF USING ANHYDROUS DRILLING MUD FOR CORING
AT ONE OF THE FIELDS OF THE TIMAN-PECHORA OIL AND GAS PROVINCE
(p. 20)

Almir Damirovich Saetgaraev

LLC "LUKOIL-Komi"

31, Nephtyanikov str., Usinsk, 169710, Russian Federation

Irina Leonidovna Nekrasova, Cand. of tech. sci.,

Pavel Alexandrovich Khvoshchin, Cand. of tech. sci.,

Olga Vladimirovna Garshina, Cand. of tech. sci., associate professor,

Dmitry Alexandrovich Kazakov, Cand. of chemical sci.,

Irina Sergeevna Borovkova, Cand. of chemical sci.,

Sergey Sergeevich Kharin,

Sergey Viktorovich Melekhin,

Igor Anatolievich Shilov

LUKOIL-Engineering PermNIPIneft Branch Office in Perm

29-21, Sovetskaya Armiya str., Perm, 614066, Russian Federation,

e-mail: Irina.Nekrasova@pnn.lukoil.com

The paper discusses the results of studies on the development of a anhydrous drilling mud formulation for coring in the mining-geological conditions of the fields of the Timan-Pechora oil and gas province. The results of field tests of the developed solution at the Yareyuskoye field are presented. A program of measures is described that regulates the procedure for sampling, isolation of cores on the surface, conducting primary studies at the well and transporting the core to the laboratory, which made it possible to ensure the invariability of the properties, and, most important, the quantitative content of fluids in the pore space of the sampled core. The results obtained during studies of the water and oil saturation of core samples from the deposits of the Lower Permian deposits of the Yareyuskoye field, selected by means of anhydrous drilling mud as a flushing fluid, will be used to calculate hydrocarbon reserves in reservoirs with a complex pore space structure and having non-hydrophilic properties.

Keywords: anhydrous drilling mud; oil-based drilling fluid; extraction and distillation method; residual oil saturation coefficient; non-hydrophilic reservoir; Yareyuskoye field.

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UDC 622.245.422 DOI: 10.33285/0130-3872-2021-3(339)-28-33

METHODS FOR DETERMINING THE TAMPING CEMENT
MORTARS PLUGGING CAPABILITY (p. 28)

Konstantin Fedorovich Shut, Cand. of tech. sci., associate professor,

Vadim Alexandrovich Khrabrov, assistant

National University of Oil and Gas "Gubkin University"

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

e-mail: cemlab@yandex.ru, k.v5@bk.ru

Due to the leakage in a well’s annular space, there is a high probability of occurrence of inter-strata cross-flows and gas-oil-water manifestations, which cause serious accidents and environmental pollution. Currently, there are various approaches to predicting the occurrence of fluid-conducting channels in the cement stone being formed. The paper analyzes the research works devoted to the problems of developing a methodology and a test bench, allowing evaluation of cement mortars plugging ability.

Keywords: suffusion; plugging ability; stratum fluid migration; test bench; pore pressure; permeability.

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UDC 622.245 DOI: 10.33285/0130-3872-2021-3(339)-34-38

POTENTIAL OF USING WELL CASINGS
MADE FROM COMPOSITE MATERIALS (p. 34)

Denis Alexandrovich Fedoseev, Head of the Technological Department,

Ilya Nikolaevich Lyapin, Head of the Drilling Technologies Department,

Maxim Evgenievich Koval, Deputy-General Director for Engineering

LLC "SamaraNIPIneft"

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

e-mail: FedoseevDA@samnipi.rosneft.ru

Gany Gaisinovich Gilaev, Dr. of tech. sci., Professor, Institute of Oil, Gas and Energy

Kuban State Technological University

88/4, Starokubanskaya str., Krasnodar, 350011, Russian Federation

The paper presents the experience of using composite pipes as casing for oil wells construction. The advantages and disadvantages of composite pipes in comparison with traditionally used steel casings are considered. An example of calculating the probability of a casing string surfacing from composite pipes during its cementing is presented. Conclusions are made about the potential of using composite casing pipes.

Keywords: casing; composite pipes; cementing; centralizer.

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UDC 539.375+531.375 DOI: 10.33285/0130-3872-2021-3(339)-39-41

DEVELOPMENT OF A VERTICAL FRACTURE UNDER A HYDRAULIC EXPOSURE
ON AN OIL-BEARING FORMATION (p. 39)

Vladislav Igorevich Dunaev, Dr. of phys.-math. sci., Professor,

Ivan Anatolievich Tereshchenko, senior lecturer,

Evgeny Ivanovich Velichko, Cand. of tech. sci., associate professor, Head of the Department,

Stanislav Ivanovich Shiyan, Cand. of tech. sci., associate professor

Kuban State Technological University

2, Moskovskaya str., Krasnodar, 350072, Russian Federation

The deformations arising from hydraulic exposure on a formation are relatively small. It can be assumed that the formation is deformed linearly elastic. The proposed model generalizes the classical fracture condition of A. Griffiths, since it takes into account the dependence of the critical pressure on the temperature and the linear coefficient of thermal expansion.

Keywords: brittle destruction; internal energy; plane problem of the theory of elasticity.

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UDC 622.276.66 DOI: 10.33285/0130-3872-2021-3(339)-42-45

EFFECT OF FRACTURING FLUID PROPERTIES
ON FORMATION AND FRACTURES PROPAGATION (p. 42)

Dmitry Viktorovich Izyumchenko, Cand. of tech. sci., Head of the Center of Oil Production Technologies,

Sergey Vladimirovich Malyshev, Cand. of tech. sci., leading researcher,

Nikolay Eliseevich Sereda, Cand. of tech. sci., leading researcher,

Alexey Ivanovich Chikrizov, leading engineer,

LLC "Gazprom VNIIGAZ"

15, bld. 1, Proektiruemy proezd No. 5337, Razvilka poselok, 142717, Moscow region, Russian Federation,

e-mail: vniigaz@vniigaz.gazprom.ru, D_Izyumchenko@vniigaz.gazprom.ru, N_Sereda@vniigaz.gazprom.ru, S_Malyshev@vniigaz.gazprom.ru, A_Chikrizov@gwise.vniigaz.gazprom.ru

Hydraulic fracturing technology is used to increase gas and oil recovery, involve weakly drained intervals opened by the well into the development, increase of well productivity and reduce the differential pressure drawdown.

This study considers the process of fluid filtration through a fracture walls, which is determined by the volume of the fluid remaining in the fracture and the fluid filtered into the formation. It is indicated that the parameter of the fluid balance, being in the fracture and filtering through its walls is the fluid utilization coefficient, which depends on the coefficient of its leakage. This parameter is the main one. It is controlled by the operator during the operation. At low values (about 20 %), it is undesirable to carry out the operation, since there is a high probability that fluid leaks will exceed the injection fluid supply, and as a result, the fracture will close, the so-called "STOP" mode.

The article demonstrates the dependence of the optimal fracture length on the injection rate of the process fluid and the leakage coefficient. The above-mentioned dependences provide a conclusion that the maximum fracture length that can be obtained is limited by the fluid leakage coefficient and the rate of its injection.

The paper presents a method for determining the leakage coefficients.

The properties of the hydraulic fracturing fluid can significantly affect the entire treatment process. Calculation of fluid injection rate and determination of fluid leakage rate is one of the most important aspects of hydraulic fracturing operation design.

Keywords: hydraulic fracturing; fracture propagation; fracture length; fluid leakage coefficient; fluid efficiency ratio; fluid injection rate.

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UDC 622.276.66 DOI: 10.33285/0130-3872-2021-3(339)-46-52

MULTI-STAGE HYDRAULIC FRACTURING (MSHF) USING COILED TUBING (CT)
IN WEAKLY CONSOLIDATED TERRIGENOUS RESERVOIRS (p. 46)

Sergey Mikhailovich Simakov, expert

LLС "GAZPROMNEFT STC"

75-79, Neberezhnaya reki Moika, St. Petersburg, 190000, Russian Federation,

e-mail: Simakov.SM@gazpromneft-ntc.ru

Anatoly Sergeevich Kichigin, business director

LLC "Packer Service"

14, bld. 2, letter A, Malygina str., Tyumen, 625048, Russian Federation,

e-mail: kichigin.as@packer-service.ru

At present, taking into account the deterioration of proven reservesquality, a separate and extremely important issue becomes the problem of the possible use of multi-stage hydraulic fracturing (MSHF) of a formation in wells with complex geology. A striking example of the successful use of a multistage hydraulic fracturing using coiled tubing was the experience gained at the Messoyakhskoye oil and gas condensate field (OGCF), where multistage fracturing was successfully carried out for hard-to-recover reserves (HTRR) of viscous oil occurring in sandy weakly consolidated reservoirs at shallow depths at low temperatures.

At this stage of the oil industry development, fields that were previously considered unprofitable, mainly HTRR, are increasingly involved in development. The experience of the Messoyakhskoye oil and gas condensate field is perhaps the most extensive in Russia in terms of testing various systems and strategies for completing horizontal wells with multistage fracturing in viscous oil conditions, occurring in sandy, weakly consolidated reservoirs at shallow depths at low temperatures. The methods and results of the work performed can be used in the design and evaluation of HTRR similar in structure.

Keywords: weakly consolidated reservoirs; multi-stage hydraulic fracturing of a formation; viscous oil; oil and gas condensate field; hard-to-recover reserves.

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UDC 622.276.66 DOI: 10.33285/0130-3872-2021-3(339)-53-58

INTENSIFICATION OF INFLOW IN WELLS
USING GDK-170 PRESSURE GENERATOR (p. 53)

M.V. Khovrina, student,

Sergey Igorevich Gubanov, post-graduate student, junior researcher,

Alexey Mikhailovich Zinoviev, Cand. tech. sciences, associate professor

Samara State Technical University

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

The prospect of enhanced oil recovery using gas-dynamic fracturing technology, which involves the use of GDK-170 pressure generators, is considered. Various designs of GDK-170 pressure generators, their advantages in comparison with other pressure generators and the results of their use are presented.

Keywords: enhanced oil recovery; gas-dynamic fracturing of a formation; impact on the near well bottom zone.

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UDC 621.45.038.7 DOI: 10.33285/0130-3872-2021-3(339)-59-64

ANALYSIS OF PILOT TESTS AND THE PROSPECTS FOR THE INTRODUCTION
OF TUBING WITH PROTECTIVE COATINGS TO PREVENT THE FORMATION
OF ASPHALT-RESIN-PARAFFIN DEPOSITS (ARPD) (p. 59)

Evgeny Ivanovich Velichko, Cand. of tech. sci., associate professor, Head of the Department, Institute of Oil, Gas and Energy,

Alexey Evstafievich Nizhnik, Dr. of tech. sci., Professor, Institute of Oil, Gas and Energy,

Yulia Georgievna Prasko, Cand. of tech. sci., associate professor, Institute of Oil, Gas and Energy

Kuban State Technological University

88/4, Starokubanskaya str., Krasnodar, 350011, Russian Federation,

e-mail: johnbottle@mail.ru, nizhnikae@mail.ru

Dmitry Alexandrovich Tsybenko, chief specialist

LLC "RN-Krasnodarneftegaz"

The paper describes the main complications arising during the operation of wells when producing oil. The mechanism and factors influencing the formation of asphalt-resin-paraffin deposits in wells are analyzed. The modern methods, applied to prevent and remove asphalt-resin-paraffin deposits are presented. The results of pilot tests of the use of tubing with a protective coating are described and an economic justification of the feasibility of this method application on a complicated fund of wells is given.

Keywords: well; complications; asphalt-resin-paraffin deposits; tubing; de-waxing; protective coating; pilot industrial tests.

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