ISSN 0130-3872

Scientific-technical journal

CONSTRUCTION

OF OIL AND GAS WELLS ON LAND AND SEA

                                                                                                           published since 1993

March 2017                                             ¹ 3                                   12 issues per year

 

CONTENÒS

 

DRILLING TECHNIQUE AND TECHNOLOGY

 

Khegay V.K., Logachev Yu.L. Drill string loading when drilling complex configuration wells (p. 4-6)

 

Khegay V.K. Longitudinal vibration of a heterogeneous drill string during directional drilling (p. 7-9)

 

Buzanov K.V. Experience in the construction of wells vertical sections ahead of schedule in conditions of the East-Siberian region using the shock-rotary drilling technology and well-bottom cleaning by air (p. 9-16)

 

Pishchukhin A.M., Solovyov N.A. The system of coordinate-parametric control over drilling by differently-rotating drill bit (p. 16-21)

 

Kamenskikh S.V. Evaluation of hydrogen sulfide effect on rock-cutting and drilling tools (p. 21-27)

 

Logachev Yu.L., Shiryaev A.B., Logachev A.Yu. Evaluation of the effect of a flow rate profile on the displacement ability of viscoelastic fluids (p. 27-31)

 

EQUIPMENT AND TOOLS

 

Serikov D.Yu., Bogomolov R.M., Panin N.M. Updating of construction of scraping-cutting drill bits (p. 32-34)

 

Mamedov V.T., Suleymanova A.J. Research of dynamic effect of impact compression of the rubber packer element during nonlinear deformation (p. 34-37)

 

WELL COMPLETION

 

Sharafutdinov Z.Z., Krivoborodov Yu.R. Polymer-cement systems for construction of oil and gas wells (p. 37-50)

 

Information on the articles (p. 51-55)

 

Memory of Viktor Ivanovich Krylov (1929–2017) (p. 56-56)

 

 

Information on the articles

 

UDC 622.24.053.2

 

DRILL STRING LOADING WHEN DRILLING COMPLEX

CONFIGURATION WELLS (p. 4)

 

Valeriy Konstantinovich Khegay,

Yuri Leonidovich Logachev

 

Ukhta State Technical University

13, Pervomayskaya str., 169300, Ukhta, Republic of Komi, Russian Federation,

phone: 8 (8216) 77-44-79,

e-mail: zav_bs@ugtu.net, hegai@ugtu.net, ulogachev@ugtu.net.

 

When drilling directional wells, the problem of maintaining sufficient axial load and torque on the rotor required for the effective destruction of rocks at a well bottom occurs. This is due primarily to the increase in the resistance of the boring tool motion in deviated wells’ sectors which reduce the axial load on the bit. The article considers the problems of estimation of a drill string loading when constructing wells of complex configuration consisting of five sectors (two vertical, two curved and a horizontal one) with account of dissipative forces. Mathematical models are developed to estimate the axial load and torque in any section of a drill string when drilling directional wells. The solution of boundary problems resulted in obtaining the equations for determining the axial load on a bit and torque on the rotor (rotary drilling) necessary for ensuring sustainable mode of drilling.

According to the results of research mathematical models are developed to estimate the load of the drill string in any of its cross-section when constructing wells of complex configuration, thus contributing to updating of strength calculation methods. The equations that allow estimation of the axial load on the rock cutting tool and torque on the rotor for a well profile, consisting of five sectors, as well as the actual axial load on a bit during wells drilling by using downhole motors are obtained. The equations can also be used to predict the axial forces in a drill string that occur in the process of tripping works.

 

Keywords: mathematical model; axial load; torque; drill string; stable movement; longitudinal force.

 

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UDC 622.24.053.2

 

LONGITUDINAL VIBRATION OF A HETEROGENEOUS DRILL STRING

DURING DIRECTIONAL DRILLING (p. 7)

 

Valeriy Konstantinovich Khegay

 

Ukhta State Technical University

13, Pervomayskaya str., 169300, Ukhta, Republic of Komi, Russian Federation,

phone: 8 (8216) 77-44-79,

e-mail: zav_bs@ugtu.net, hegai@ngtu.net

 

In most cases, when drilling directional wells, a drill string «lies» on the bottom wall of a well. In this case, during the flow of wave processes, the role of the dissipative forces acting along the length of the drill string should sharply increase. Dissipative forces acting along the length of the drill string in an inclined well, are a combination of friction, obeying the Amonton –Coulon’s law, and the forces beyond the direct control of the normal pressure.

The article studies the problem of wave perturbations propagation along a heterogeneous drill string with account of the dry friction forces during directional drilling. Investigated the case when a drill string is composed of two different segments, equivalent to the sectors of drill pipes and drill collars is studied.

A mathematical model of the wave propagation in a drill string, consisting of two different segments, with account of Coulomb friction force, when drilling directional wells is developed. To solve the nonlinear problem related to the occurrence of wave processes along the length of the drill string with account the dry friction force, the method of averaging and the method of mechanical analogue, that allowed to linearize the task are applied.

The conducted analysis of the mathematical model of the wave propagation processes along a drill string in an inclined well has allowed to establish the relationship between the parameters (amplitude and frequency) of harmonic disturbance and mechanical parameters of a drill string under which the bottom-hole perturbation propagates through the drill string. The conditions of the longitudinal resonance development and the ratio to determine the boundaries of the total attenuation of downhole perturbations during its propagation through the drill string, consisting of two different segments, are obtained.

 

Keywords: wave process; directional drilling; heterogeneous drill string; dissipation forces; bottom disturbance amplitude.

 

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UDC 622.24

 

EXPERIENCE IN THE CONSTRUCTION OF WELLS VERTICAL SECTIONS

AHEAD OF SCHEDULE IN CONDITIONS OF THE EAST-SIBERIAN REGION

USING THE SHOCK-ROTARY DRILLING TECHNOLOGY AND

WELL-BOTTOM CLEANING BY AIR (p. 9)

 

Kirill V. Buzanov

 

Naional research Tomsk Polytechnic University

phone: +7 (961) 555-84-14,

e-mail: byzanovaltay@mail.ru

 

This article analyzes the experience of construction of direction control sections ahead of the schedule for the production wells of Kuyumbinsky oil field on the basis of a mobile rig using the downhole hammer and cleaning the well bottom zone by gas-liquid mixtures. The author makes conclusions based on the actual operating results and gives recommendations on accident-free construction of the direction control sections and conductors in the geological conditions of Kuyumbinskoye field.

 

Keywords: drilling in the cavernous-porous dolomites; disastrous absorption of drilling mud; ahead of the schedule construction of direction control sections; well-bottom cleaning liquid mixtures; drilling with downhole hammer.

 

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UDC 681.513.6

 

THE SYSTEM OF COORDINATE-PARAMETRIC CONTROL OVER DRILLING

BY DIFFERENTLY-ROTATING DRILL BIT (p. 16)

 

Alexander Mihailovich Pishchukhin,

Nikolay Alexseevich Solovyov

 

Orenburg State University

e-mail: pishchukhin55@mail.ru, povtas@mail.osu.ru

 

Synthesis of a mechanical system intended for parametric control over additional properties of drilling tools is performed by dividing the well bottom area into circular and an annular parts, which are drilled by drill bit rotating in opposite directions. Jet moments adjustment is done by the change of the area of the annular and circular parts.

Coordinate control refers to the drilling process, while parametric control – to equalization of the reactive moments. The mathematical model study allowed to prove the theorems linking the total losses of drill bits’ rotational frequency under load with the coordinates of the drilling process. The concept of a torsion pulse as an indicator of control over the process of the reactive moments balancing is introduced. Numerical integration shows the achievable performance of torsion pulse limits.

 

Keywords: coordinate-parametric control; control over the main process properties; transition process; torsion impulse; drilling by opposite-rotating drill bits.

 

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UDC 622.24

 

EVALUATION OF HYDROGEN SULFIDE EFFECT

ON ROCK-CUTTING AND DRILLING TOOLS (p. 21)

 

Sergey Vladislavovich Kamenskikh

 

Ukhta State Technical University

9, Pervomaiskaya str., 169300, Ukhta, Republic of Komi, Russian Federation,

phone: 8 (8216) 77-44-79,

e-mail: skamenskih@ugtu.net, zav_bs@ugtu.net

 

The studies of many domestic and foreign scholars have shown that pH of the drilling fluid and the presence of hydrogen sulfide have a negative impact on the stability and the life-time of processing of roller cone and PDC drill bits and drilling tools. That’s why assessment of pH and hydrogen sulfide concentration effect on the life-time indicators of rock cutting and drilling tools, is, undoubtedly, an urgent task. The article presents the theoretical and laboratory studies evaluating the effect of pH and hydrogen sulfide concentration on the drill bits and drilling tools. It is proved that pH increase leads to stability of drill bits increases while concentration of hydrogen sulfide leads to the resource (stability) of rock cutting tool is reduced. It is shown that the produced water containing hydrogen sulfide, is more aggressive than oil with H2S, despite the lower concentration. It is confirmed that in the conditions of hydrogen sulfide aggression it is necessary to use «milder» steel and high-alkaline drilling fluids.

 

Keywords: hydrogen sulfide; rock-cutting tools; roller bits; ÐDC bits; pH indicator; pipe samples.

 

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UDC 622.245.423.053:005.6

 

EVALUATION OF THE EFFECT OF A FLOW RATE PROFILE

ON THE DISPLACEMENT ABILITY OF VISCOELASTIC FLUIDS (p. 27)

 

Yuri Leonidovich Logachev,

Andrey Bogdanovich Shiryaev,

Alexander Yurievich Logachev

 

Ukhta State Technical University

13, Pervomayskaya str., 169300, Ukhta, Republic of Komi, Russian Federation,

phone: 8 (8216) 77-44-79,

e-mail: zav_bs@ugtu.net, ulogachev@ugtu.net, andrykor1990@mail.ru, spaceskype@yandex.ru

 

During technological operations related to casing strings cementing, installation of cement bridges, when pumping bundles of viscoelastic fluids into a well, several portions of non-Newtonian fluids with different rheological properties are consistently pumped. Herewith, there appear the problems of assessment of the replacement ability during their combined flow and determination of the time of the displaced fluid release at the wellhead or its achievement of the definite position in a well.

The rates profile, both in pipes and the annulus is under the effect of rheological indicators as well as liquids abnormal behavior which rather often brings unpredicted results. Non-Newtonian behavior of most drilling fluids is satisfactorily described by Shvedov-Bingham rheological model (viscous-plastic liquids – VPL).

The article discusses the rheological parameters effect of the dynamic yield point τ0 and plastic viscosity η on the profile rates geometry and determines the boundary of separation of two successively moving VPL. Possibility of prediction of the composite flow distribution of in time and volumes of the replaced fluid in pipes and annular space will improve the quality of cementation and displacement of drilling mud batches, enriched by sludge.

The article analyzes the process of one VPL displacement by another one under the condition of equality of their rheological parameters, without accounting of gravitational effects as well as examines the factors affecting the dynamics of its flow.

Assessment of substitution of drilling and cement slurries is given in the article by the results of numerical modeling to determine the rates profiles for different annular cross-sections and the proposed method of control under laminar flow are shown in the article.

 

Keywords: consistent for non-Newtonian fluids; the flow regime of the fluid; velocity profiles in the annular space; the displacement in the pipes and in the annular space.

 

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UDC 622.24.051

 

UPDATING OF CONSTRUCTION OF SCRAPING-CUTTING DRILL BITS (p. 32)

 

Dmitry Yurievich Serikov,

Nikolay Mitrofanovich Panin

 

Gubkin Russian State University of Oil and Gas (NRU)

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

phone/fax: (915) 372-77-79 (Serikov D.Yu.),

e-mail: serrico@rambler.ru

 

Rodion Mikhailovich Bogomolov

 

Samara State Technical University

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

 

The results of the work aimed at updating of construction of scraping-cutting drill bits by increasing the efficiency of washing systems are presented in the article.

 

Keywords: scraping-cutting drill bit; drill-bit cutting structures; washing system; washing channels.

 

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UDC 622.245.44

 

RESEARCH OF DYNAMIC EFFECT OF IMPACT COMPRESSION

OF THE RUBBER PACKER ELEMENT DURING NONLINEAR DEFORMATION

(p. 34)

 

Vasif Talib Mamedov,

Arzu Javanshir Suleymanova

 

Azerbaijan State University of Oil and Industry (ASUOI)

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

phone: (+994) 12-59-84-937,

e-mail: ar.suleymanova@mail.ru

 

In the article considers the study of the dynamic effect during a non-linear deformation. To do this, the plasticity condition during a solid body impact of the packer support ring with rubber seal is used. When solving the differential equation, the relative deformation of the sealing element as well as its height after the impact is defined.

The obtained value coincides with the experimental result.

 

Keywords: downhole packer (seal); relative deformation rate; voltage; plasticity conditions; nonlinear deformation; force of inertia; the relative shortening of the viscous-elastic bodys.

 

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UDC 622.245

 

POLYMER-CEMENT SYSTEMS

FOR CONSTRUCTION OF OIL AND GAS WELLS (p. 37)

 

Zarif Zakievich Sharafutdinov

 

LLC «Research Institute «Transneft»

47a, Sevastopolsky prosp., 117186, Moscow, Russian Federation,

e-mail: SharafutdinovZZ@niitnn.transneft.ru

 

Yu.R. Krivoborodov

 

Mendeleev Russian Chemical-Technical University

 

The article discusses the problems of formation of cement stone structure with the addition of various polymers. It is shown that the idea of supramolecular chemistry can not only describe the cement hydration process and the formation of cement stone, but also take into account the level of impact of various polymers, the initial phase composition of cement and products of its hydration.

 

Keywords: cement; supramolecular chemistry; cement hydrate compounds; polymers; wells cementing; formation of polymer-cement structures.

 

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MEMORY OF VIKTOR IVANOVICH KRYLOV (1929–2017)

(p. 56)

 

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JSC "ALL-RUSSIAN SCIENTIFIC-RESEARCH INSTITUTE OF ORGANIZATION, MANAGEMENT AND ECONOMICS OF OIL AND GAS INDUSTRY"

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