Determination of Preconditions Leading to Critical Stresses in Pipeline During Lowering

Melnychenko, Yurii; Poberezhny, L.; Hrudz, V. Ya.; Zapukhliak, Vasyl; Chudyk, І. І.; Dodyk, T. Ya.

doi:10.1007/978-3-030-58073-5_19

“…As well as corrosive wear [10][11][12], erosive wear is one of the factors affecting the stress-strain state of the bends, reducing their residual life [13]. Also, the stress-strain state of pipeline bends is influenced by a complex uneven distribution of pressure in their internal cavity, a change in pressure in the pipeline [14][15][16][17], bending of the pipe [18]. All these circumstances are superimposed on each other and on the complex geometric shape of the bends.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on erosion wear and strength of main gas pipelines bends

Doroshenko

¹

,

Kogut

²

,

Rybitskyi

³

et al. 2021

Phys. Chem. Solid St.

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The purpose of this work is to ensuring the strength of main gas pipelines bends by studying the peculiarities of single-phase and multiphase flows movement through the internal cavity, the processes of erosion wear and the wall stress state. The problem of synergistic influence of gas-dynamic processes (uneven pressure distribution in the internal cavity), temperature difference and erosion wear on the stress state of the bends of main gas pipelines was solved by numerical simulation. Based on the results of simulation the processes of bends erosion wear, an algorithm for three-dimensional simulation of bend walls erosion defects was developed. The complex three-dimensional geometric shape of the erosion defects of the bend wall varied according to the rate of erosion wear process. This algorithm made it possible to determine the regularities for the influence of the bend erosion defects magnitude on bends stress state. It was established that considering the maximum depth of bend erosion defects 9.6 mm, 10.5 mm and 11.9 mm, the equivalent stresses in the deepest places of the erosion defect were greater than on the concave side of the bend and in straight sections of the pipeline.

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“…As well as corrosive wear [8][9][10], erosive wear is one of the factors affecting the stressstrain state of the bends, reducing their residual life [11,12]. Also, the stress-strain state of pipeline bends is influenced by a complex uneven distribution of pressure in their internal cavity, a change in pressure in the pipeline [13][14][15], bending of the pipe [16]. All these circumstances are superimposed on each other and on the complex geometric shape of the bends.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Erosion Wear and Strength of Main Gas Pipelines Bends

Doroshenko

¹

,

Galyna

²

,

Yuliia

³

et al. 2021

Strojnícky Časopis - Journal of Mechanical Engineering

3

0

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The purpose of this work is to ensuring the strength of main gas pipelines bends by studying the peculiarities of single-phase and multiphase flows movement through the internal cavity, the processes of erosion wear and the wall stress state. The problem of synergistic influence of gas-dynamic processes (uneven pressure distribution in the internal cavity), temperature difference and erosion wear on the stress state of the bends of main gas pipelines was solved by numerical simulation. Based on the results of simulation the processes of bends erosion wear, an algorithm for three-dimensional simulation of bend walls erosion defects was developed. The complex three-dimensional geometric shape of the erosion defects of the bend wall varied according to the rate of erosion wear process. This algorithm made it possible to determine the regularities for the influence of the bend erosion defects magnitude on bends stress state. It was established that considering the maximum depth of bend erosion defects 9.6 mm, 10.5 mm and 11.9 mm, the equivalent stresses in the deepest places of the erosion defect were greater than on the concave side of the bend and in straight sections of the pipeline.

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“…According to the principle of operation, polycrystalline diamond chisels belong to the chisels of cutting and scaling action. Their special feature is the presence of a thin layer of synthetic polycrystalline diamonds on the surface of the cutting elements, firmly connected to a hard alloy base [7,8]. The cutting elements made in this way have high strength characteristics that are not inferior to natural diamonds.…”

mentioning

confidence: 99%

Improvement of the methodology for calculating the expected drilling speed with PDC chisels

Ratov,

Sudakov,

Fedorov

et al. 2024

Nauk. visn. nat. hirn. univ.

0

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Purpose. Determination of the dependence of the depth of penetration of the PDC cutter into the bottom hole rock, taking into account its geometric parameters and spatial placement in relation to the destroyed array. Methodology. The tasks were solved by a comprehensive research method, including analysis and generalization of literary and patent sources, conducting theoretical research, which consists in solving the theoretical problem of the impact of a superhard circular cutter on an elastically fragile mountain range, using computer and mathematical modeling methods. Findings. A simplified expression has been obtained that allows taking into account the features of the PDC cutter with sufficient accuracy for engineering calculations when determining the depth of its penetration into the bottom hole rock. A method is proposed for calculating the depth of fracture in one revolution of a diamond carbide cutter PDC into the rock of the bottom of the well. The patterns of destruction by the proposed diamond-hard-alloy PDC chisel of a rock mass at the bottom of the well from the parameters of the drilling regime and the hardness of the drilled rocks have been established. Originality. For the first time, the dependence has been obtained of the influence of the geometric parameters of the shape of a single diamond-carbide PDC cutter and its spatial placement in the body of the bit matrix on the magnitude of the technological parameters of drilling a well, and their effect on the nature of the destruction of the array PDC cutter. Practical value. A technique for determining the depth of penetration of a single PDC cutter is proposed, the use of which will allow predicting the mechanical speed, depending on the geological and technical conditions of drilling wells. And taking into account the abrasive properties of rocks, it is possible to reduce the wear of the bits, and therefore the amount of necessary rock-crushing tools for the entire volume of drilling operations during the construction of the well.

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Determination of Preconditions Leading to Critical Stresses in Pipeline During Lowering

Cited by 3 publications

References 16 publications

Numerical investigation on erosion wear and strength of main gas pipelines bends

Numerical investigation on erosion wear and strength of main gas pipelines bends

Numerical Study on Erosion Wear and Strength of Main Gas Pipelines Bends

Improvement of the methodology for calculating the expected drilling speed with PDC chisels

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