Improving the aluminum drill pipes stability by optimizing the shape of protector thickening

Olesya, Vlasiy; Мазуренко, В. В.; Ropyak, Lіubomyr; Rogal, Alexander

doi:10.15587/1729-4061.2017.65718

Cited by 34 publications

(14 citation statements)

References 15 publications

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“…The force distribution for the proposed model was calculated according to the standard methods [7,30,31]. The forces were as follows: q 1 = 5.2 kN/m and q 2 = 28.5 kN/ m for the oil pipeline filled with the product and q 1 = 1.7 kN/m and q 2 = 25 kN/m for the empty pipeline.…”

Section: Force Analysismentioning

confidence: 99%

Analytical model of oil pipeline overground transitions, laid in mountain areas

Velychkovych

Andrusyak

Pryhorovska

et al. 2019

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Abnormal climate changes cause adverse physical and geographical processes (erosion of soils, waterlogging, flooding, etc.) over the world. This situation stipulates study on effect of soil foundation malleability on pipeline transition strength because of its important diagnostic value. The article develops an engineering approach for stress–strain state estimation of oil pipeline overground transitions, laid in mountainous areas. A mathematical statement was made and analytical solutions of the boundary-value problem were described, which take into account overland transition contact with soil foundation. In order to carry out the force analysis, a tubular rod simulated the oil pipeline contacting with the soil foundation on the adjacent to the overground transition section according to the Fuss-Winkler hypothesis. The overground transition was schematised with a thin-walled shell at the final stage of the assessment of strength. The maximum axial stresses were determined for overground transition operation, considering transition’s two-dimensional thermoelastic state. The final assessment of the strength was carried out according to the energy criterion. The proposed method for the overground transition simulation makes possible considering the soil foundation property effects on the behavior of the oil pipeline transition and presents the results in the form of concise analytical expressions convenient for engineering practice. The conducted researches showed the effect of significant redistribution of loading in the oil pipeline overground transition caused by changes of soil foundation stiffness. Also, the boundary effect of perturbation of the stressed state in adjacent underground sections was found. It was determined the zone sizes the boundary effect has significant manifestations. The boundary state of the pipeline is most often achieved in its lower fibers at a short distance from the edge of the underground section. The obtained results of researches were tested on real constructions of overground transitions of oil pipeline laid in mountainous areas.

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Section: Force Analysismentioning

confidence: 99%

Analytical model of oil pipeline overground transitions, laid in mountain areas

Velychkovych

Andrusyak

Pryhorovska

et al. 2019

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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show abstract

“…The existing reference documents and the literary sources known to us (Liu & Weber, 2012;Kozhevnikov et al, 2015;Kotskulych et al, 2016;Vytvytskyi et al, 2017) provide a number of recommendations for the installation of bow-spring centralizers, depending on the configuration of the well axis. General problems of interaction of columns with the borehole were considered, in particular, in the papers (Aleksandrov, 1982;Vlasiy et al, 2017;Levchuk, 2018;Kryzhanivskyi et al, 2018). Various approaches to the engineering simulation of contact phenomena in rod structures using classical theories of rods are proposed in publications (Mossakowskii et al, 1978;Bedzir et al, 1995;Neto et al, 2014;Shats'kyi et al, 2016;Popadyuk et al, 2016;Jawed et al, 2018).…”

Section: State Of Question and Statement Of Research Problemmentioning

confidence: 99%

Analytical models of contact interaction of casing centralizers with well wall

Shatskyi¹,

Velychkovych²,

Vytvytskyi³

et al. 2019

10.5267/j.esm

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The problem of interaction of rod centralizers of casing with a well wall is considered. The paper aims at studying the ways of fastening of centralizer's ends on the parameters of its rigidity and strength. Knowledge of these characteristics is necessary for the assessment of casing column drift and well completion quality. For simulation of the working links of the centralizers, the classical linear theory of smooth rods, rigid along the axis and elastic on bending is used. Stress-strain state of bow-type rod with six different variants of fastening under conditions of point contact is studied. The analytical relations between the contact force and the mutual approach of the column and the well wall, as well as the expressions for the admissible contact loads, are established. The way of fastening the rod significantly influences these characteristics; in particular, the fact of the presence or absence of freedom of mutual movement of its ends along the pipe is decisive. The engineering formulas, which serve as two-side estimations of the rigidity and strength of the real structures of centering devices, are obtained. A comparative analysis of mechanical properties of centralizers has been conducted.

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“…However, these approaches cannot fully meet the needs of engineering practice because of their mathematical complexity. The works, which describes the numerical methods for contact problem solving and experimental approaches (for example, (Velichkovich & Dalyak, 2015;Velichkovich et al, 2011;Vlasiy et al, 2017)) deserve attention too. Attention is paid to the simulation of strength, stiffness and stability of shell and planar structures, especially of their complex forms (Panevnik & Velichkovich, 2017) and for cases of stress concentrators (Kolesov et al, 1992) or inclusions.…”

Section: Introductionmentioning

confidence: 99%

Analytical estimation of tooth strength, restored by direct or indirect restorations

Bulbuk¹,

Velychkovych²,

Мазуренко³

et al. 2019

10.5267/j.esm

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This work presents a stress-strain state analytical estimation of restored tooth hard tissues with consideration of their contact interactions with a monolithic filling or a dental onlay. The tooth with a defect is simulated as a continuous isotropic cylindrical body with a non-through hole, and the filling or onlay is simulated as an elastic deformable cylinder. The contact between the tooth and the fillings (onlay) is simulated as the ideal contact. The final strength estimation of the restored tooth is carried out according to the energy criterion. The authors suggest a linear index of tooth damage for practical application of the obtained results. This index can be easily obtained by direct measurement. The differential approach is developed to select a restoring method of the tooth with the defect to provide a reliable restoration of the anatomical crown of the tooth.

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Improving the aluminum drill pipes stability by optimizing the shape of protector thickening

Cited by 34 publications

References 15 publications

Analytical model of oil pipeline overground transitions, laid in mountain areas

Analytical model of oil pipeline overground transitions, laid in mountain areas

Analytical models of contact interaction of casing centralizers with well wall

Analytical estimation of tooth strength, restored by direct or indirect restorations

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