Construction of Oil and Gas Wells on Land and Sea

Reduction of hydrocarbons production cost in conditions of a general deterioration in their structure is the main tool to increase the financial attractiveness of oil companies' projects for hydrocarbon deposits development. Analysis of financial costs shows that up to 40–50 % of the cost of well construction total costs is spent at the drilling stage.

In order to increase the efficiency of wells construction, the paper discusses the problems of use of a drilling process modeling apparatus taking into account modern concepts – theories of rock masses destruction.

The first part of the paper is devoted to the development of a mathematical model, presented in the form of a generalized structure of the technological process, the definition of criteria for the effectiveness of drilling operations and the parameters that affect the drilling process.

Keywords: raw material base of liquid hydrocarbons; wells drilling; rock destruction; strength theory; performance efficiency criterion; drilling process model; mathematical model.

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UDC 622.24.051.64 DOI: 10.33285/0130-3872-2020-7(331)-13-15

HYDRODYNAMICS OF THE CUTTING PROCESS BY PDC BIT CUTTERS (p. 13)

Vyacheslav Vasilievich Neskoromnykh, Dr. of tech. sci., Professor, Head of the Department,

Marina Sergeevna Popova, Cand. of tech. sci., senior lecturer

Siberian Federal University (SFU)

95, "Krasnoyarsky rabochy" gazeta prosp., Krasnoyarsk, 660025, Russian Federation,

e-mail: sovair@bk.ru, alleniram83@mail.ru

The paper is devoted to hydrodynamic processes occurring at the bottom of a well during rock destruction by a PDC bit cutter. An analytical and computer study of fluid pressure distribution in a well bottom zone within one PDC bit cutter was carried out. It was determined that the greatest pressure is concentrated near the contact zone of the bit cutter with the rock, and an increase in the speed of the bit cutter movement stimulates a pressure increase under it.

Keywords: PDC-type bit cutter; fluid pressure; rock destruction; resistance forces.

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UDC 622.24 DOI: 10.33285/0130-3872-2020-7(331)-16-19

IMPROVEMENT OF THE DRILLING, ROCK-DESTROYING,
CUTTING-TYPE TOOL (p. 16)

Rodion Mikhailovich Bogomolov, Dr. of tech. sci., Professor

Samara State Technical University

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

Dmitry Yurievich Serikov, Dr. of tech. sci., associate professor

National University of Oil and Gas (Gubkin University)

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

e-mail: serrico@rambler.ru

The paper presents the results of work aimed at improving the drilling, rock-destroying, cutting-type tool. The work of the drilling tool equipped with PDC cutting elements, and its design features is analyzed. A design of a core bit designed for drilling with a core sampling is proposed, the use of which will increase the resistance of this type of tool due to more reliable fixation of its rock-cutting bit cutters, preventing them from falling out. It will also provide reduction of the cost of the drilling, rock-destroying bit cuttiers due to the simplification of its manufacturing technology and ensure the possibility of its repair by the drilling crew directly at the drilling site.

Keywords: drilling tool; rock-destroying elements; flushing channels; fixing pins.

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UDC 622.24.063.2 DOI: 10.33285/0130-3872-2020-7(331)-20-23

STUDY OF THE INFLUENCE OF THE COMPONENT COMPOSITION
OF A HYDROCARBON-BASED SOLUTION ON RHEOLOGICAL
PARAMETERS (p. 20)

Nikolay Ivanovich Nikolaev, Dr. of tech. sci., Professor,

Margarita Evgenievna Budovskaya, post-graduate student,

Dmitry Andreevich Sidorov, post-graduate student

St. Petersburg Mining University

2, 21 liniya of Vasilievsky ostrov, St.-Petersburg, 199106, Russian Federation,

e-mail: nikinik@mail.ru, folloo.01@mail.ru, dmitrysidorov95@gmail.com

Increased demand on the use of hydrocarbon-based flushing fluids is associated with ever-increasing requirements to the quality of productive reservoirs opening. Completion of wells using hydrocarbon-based solutions is most appropriate for maintaining the productive reservoir characteristics. However these solutions are quite expensive. To reduce the cost of such systems, emulsion solutions have been developed, which are increasingly used during the initial opening, but for their effective use it is necessary to justify the choice of component composition [1].

It is known that the solution used for a reservoir opening should not deteriorate the natural permeability of the productive zones and should provide excellent wellbore washing. In this regard, to meet all the tasks set, base oil is used as the basis for a hydrocarbon-based solution. Oil has a direct impact on the rheological and filtration characteristics of the hydrocarbon system [2].

Studies conducted in the work showed the effectiveness of the use of synthetic specialized low-viscosity oils. They opened a field for further research in order to identify patterns arising from changes in the component composition.

Keywords: well drilling; complications; laboratory research; rheology; hydrocarbon-based solutions; emulsion solutions; productive layer; viscosity.

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UDC 622.245.422 DOI: 10.33285/0130-3872-2020-7(331)-24-27

COMPOSITIONAL WEIGHTED DRILLING MUDS (p. 24)

Vasily Pavlovich Ovchinnikov, Dr. of tech. sci., Professor,

Alexander Vasilievich Melekhov, post-graduate student,

Oksana Vladimirovna Rozhkova, administrator of the education program

Tyumen Industrial University

70, Melnikaite str., Tyumen, 625038, Russian Federation

Pavel Vasilievich Ovchinnikov, Dr. of tech. sci., Professor, Head of the Department

LLC "LUKOIL-Engineering"

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

The paper shows the effectiveness of barite mineral use as a weighting additive in Portland cement mixtures of the CTTC type. The physical-mechanical properties of the stone formed on their basis at the temperature of 120 °C and the pressure of 40 MPa are described. A heat-resistant composition based on a cement-slag composition is proposed; the physical-mechanical properties of the solution and the stone formed on their basis are presented.

Keywords: grouting mortar; barite; density; physical-mechanical properties; cement.

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UDC 622.245.42 DOI: 10.33285/0130-3872-2020-7(331)-28-35

SOME SPECIFIC FEATURES OF INTERACTION OF PORTLAND
CEMENT SOLUTIONS AND A STONE WITH RATHER STRONG BRINES
OF THE EASTERN SIBERIA DEPOSITS (p. 28)

Ivan Ilich Beley, Cand. of tech. sci., Head of the Laboratory "Grouting Mortars"

LLC "TyumenNIIgiprogaz"

2, Vorovskogo str., Tyumen, 625019, Russian Federation,

e-mail: i.beley@nedra.gazprom.ru

Alexey Sergeevich Korostelev, Deputy-General Director (R&D),

Evgeny Borisovich Tsypkin, General Director

CJSC "SpecCementService"

12, bld. 7, office 202, Sibirsky tract, Ekaterinburg, 620100, Russian Federation,

e-mail: info@spec-cement.ru

The problems of the influence of contraction and osmotic effects on the nature of the interaction of cement slurry/stone with highly saline formation waters are considered. The results of studies of the influence of the composition and condition of the Portland cement grouting system (mortar or preformed stone) on the direction of filtration flows, the state of the stone during prolonged contact with very strong brines of East Siberian deposits are presented. The data obtained can be used when developing compositions of corrosion-resistant grouting mixtures for casing strings cementing in the intervals of aquifers.

Keywords: interaction; Portland cement mortar; stone; rather strong brine; the Eastern Siberia.

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UDC 622.24 DOI: 10.33285/0130-3872-2020-7(331)-36-42

NEW HIGH-TECH EQUIPMENT FOR CEMENTING WELLS (p. 36)

Natalia Vladimirovna Samsonenko, Cand. of tech. sci., senior lecturer

National University of Oil and Gas (Gubkin University)

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

Widely used domestic and foreign sets of equipment for cementing oil and gas wells are intended for the preparation of only sedimentation- and suffusion-unstable wells, using recirculation, being the result of very limited (up to 1 min) interaction time, of dry mixtures with mixing fluid, suspensions of constant density at different mixing intensity. Practical implementation of the new cementing technology requires new high-tech equipment for the preparation of aerated sedimentation and suffusion-resistant hydrogel facilitated erosion buffer and grouting mortars, as well as grouting mortars of normal density under the given laboratory water-mixture relations.

Keywords: well cementing; cementing equipment; a set of equipment for wells cementing; aerated grouting mortar; new casing cementing technology; grouting cements.

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UDC 622.245.1 DOI: 10.33285/0130-3872-2020-7(331)-43-48

TO THE PROBLEM OF CEMENTING DIRECTIONS OF MARINE WELLS
WITH A WELLHEAD UNDERWATER LOCATION UNDER CONDITIONS
OF GEOLOGICAL-TECHNOLOGICAL COMPLICATIONS
ON THE EXAMPLE OF SHELF DEPOSITS
OF THE SAKHALIN ISLAND(p. 43)

Vadim Evgenievich Petrenko, Cand. of tech. sci., Head of the Department

PJSC Gazprom

156, Moskovsky prosp., St. Petersburg, 196105, Russian Federation,

e-mail: V.Petrenko@adm.gazprom.ru

Garry Sergeevich Oganov, Dr. of tech. sci., Professor, First Deputy-General Director,

Andrey Valerievich Potapov, leading design engineer

LLC "Krasnoyarskgazprom Neftegazproekt"

11, Posledny pereulok, Moscow, 107045, Russian Federation,

e-mail: G.Oganov@krskgazprom-ngp.ru, A.Potapov@krskgazprom-ngp.ru

Alexander Mikhailovich Likhushin, Dr. of tech. sci., chief researcher

LLC "Gazprom VNIIGAZ"

15, bld.1, Proektiruemy proezd 5537, poselok Razvilka, 142717, Leninsky district, Moscow region, Russian Federation,

e-mail: Lihushin@list.ru

The drilling volumes growth of offshore fields’ further development provides increase of the number of wells with an underwater location of the wellhead in difficult geological conditions. At the same time, the proper quality of well cementing, including direction and conductor, remains an important task to ensure safe and efficient production for the entire period of operation. The paper, illustrating one of the typical designs and profiles of production wells on the Sakhalin shelf, analyzes the complications that actually arise when conducting works to strengthen the directions, as well as measures to prevent them.

Keywords: wells with an underwater location of the wellhead; cementing; fastening; wellhead; direction; complications; measures to prevent complications.

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UDC 621.642 DOI: 10.33285/0130-3872-2020-7(331)-49-53

MODERN STRUCTURES OF ROOF SEALS OF FLOATING ROOFS
OF VERTICAL STEEL TANKS (p. 49)

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

Marina Gennadievna Prikhodko, post-graduate student,

Alexey Evstafievich Nizhnik, Dr. of tech. sci., Professor,

Anna Viktorovna Muzykantova, senior lecturer

"Kuban State Technological University", Institute of Oil, Gas and Energy

88/4, Starokubanskaya str., Krasnodar, 350057, Russian Federation,

e-mail: johnbottle@mail.ru, aniram-m03@mail.ru, nizhnikae@mail.ru, nytamuz@mail.ru

The paper presents an overview of the existing constructions of roof seals of tanks floating roofs. Today, floating roofs are one of the most effective ways to prevent oil and oil product losses during the operation of vertical steel tanks.

The paper presents the classification of roof seals for tanks with a floating roof, based on the types and constructions of sealing elements, examines the advantages and disadvantages of the existing types of roof seals, since it is the quality of the seal between the tank wall and the floating roof that significantly prevents the reduction of oil and oil products losses from evaporation.

Keywords: roof seal; vertical steel tank; floating roof; small breaths; evaporation; losses reduction.

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NATIONAL UNIVERSITY OF OIL AND GAS "GUBKIN UNIVERSITY"

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