Wyniki wyszukiwania - BazTech

1

Reductıon of thermal tensıons and temperatures formed ın the trıbonodes and surfaces of the equıpment and tools used ın well workover and restoratıon works

Mustafayev Amir G., Nasirov Chingiz R.

Nafta-Gaz

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2023

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R. 79, nr 10

661--669

EN

The maintenance of equipment and tools used in the workover of oil and gas wells depends on keeping them in good working condition, maintaining the reliability, strength, and temperature endurance of the tool. To restore wells after an accident and bring them back into operation, it is necessary to speed up the drilling and repair work by choosing the right repair equipment and following the existing rules and regulatory documents. The cutting elements of tools working under high pressure and loads are deformed, a tense situation is created in the cutting – a destruction zone and high temperatures (1000–1200°C) occur because of corrosion in the triboknots. The stress-deformation state in the cutting-destruction zone causes the formation of microcracks in the working area of the tool. Microcracks grow after a certain period. Cutting elements are quickly worn, in some cases break and fail quickly. Such cases affect the structural composition of the cutting elements, an increase in temperatures; as a result, riveting occurs. In order to keep the equipment and tools used in the repair in normal working condition, adjusting the mode parameters is one of the important requirements, in addition to taking special care of them. Optimum results obtained in repair and restoration depend on the efficiency of the cutting-destructive tool, longevity, material selection, construction manufacturing technologies, tools that meet modern requirements, dimensions, weight, and internal condition of the well being restored. It is necessary to keep the heat generated in the moving parts of the tool at the required level for the safe performance of restoration work. The thermal regime of cutting and rock-destroying tools depends on the physical-mechanical properties of the objects subjected to destruction, and the effect of thermomechanical stresses generated on the contact surfaces of the tool and the amount of heat released from the working surface. Studying the problems related to heat issues will ensure the temperature tolerance of not only the repair equipment, but also the equipment and tools used in other areas of the oil-field industry.

PL

Utrzymanie urządzeń i narzędzi używanych w rekonstrukcjach odwiertów ropy i gazu zależy od zachowania ich w stanie gotowości do pracy, niezawodności, wytrzymałości oraz trwałości temperaturowej narzędzia. Aby przywrócić odpowiedni stan odwiertów po awarii oraz ponownie rozpocząć ich eksploatację trzeba przyspieszyć prace wiertnicze i naprawy poprzez wybranie właściwych urządzeń naprawczych oraz przestrzeganie istniejących przepisów i dokumentów regulacyjnych. Elementy tnące narzędzi pracujących pod wysokim ciśnieniem i obciążeniami ulegają deformacji, wytwarza się sytuacja naprężenia w strefie tnąco-niszczącej i występują wysokie temperatury (1000–1200°C) w wyniku korozji w węzłach tarcia. Stan naprężenie-odkształcenie w strefie tnąco- -niszczącej powoduje tworzenie mikropęknięć w obszarze roboczym narzędzia. Mikropęknięcia propagują po pewnym czasie. Elementy tnące szybko się zużywają, w niektórych przypadkach szybko pękają i ulegają awarii. Takie przypadki wpływają na skład strukturalny elementów tnących, wzrost temperatury i w rezultacie następuje unieruchomienie. Aby utrzymywać urządzenia i narzędzia używane przy naprawie w normalnych warunkach roboczych, jednym z najważniejszych wymogów jest dostosowanie parametrów trybu pracy, oprócz objęcia ich specjalną uwagą. Dobre wyniki uzyskane w robotach naprawczych i renowacyjnych zależą od sprawności narzędzia tnąco-niszczącego, trwałości, doboru materiałów, technologii produkcji konstrukcji, narzędzia spełniającego nowoczesne wymagania, jego wymiarów, wagi oraz stanu wewnętrznego odwiertu podlegającego renowacji. Dla bezpiecznego wykonania prac renowacyjnych konieczne jest utrzymanie ciepła generowanego w częściach ruchomych narzędzia na wymaganym poziomie. Reżim cieplny narzędzi tnących i niszczących skałę zależy od właściwości fizyko-mechanicznych obiektów podlegających niszczeniu i efektu naprężeń termomechanicznych generowanych na powierzchniach kontaktowych narzędzia oraz od ilości ciepła uwolnionej z powierzchni roboczej. Badanie problemów związanych z zagadnieniami ciepła pozwoli na zapewnienie tolerancji temperaturowej nie tylko urządzenia naprawczego, ale również urządzeń i narzędzi używanych w innych dziedzinach przemysłu złóż ropy.

2

Ensemble selection in one-versus-one scheme – case study for cutting tools classification

Rojek Izabela, Burduk Robert, Heda Paulina

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2021

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Vol. 69, nr 1

art. no. e136044

EN

The binary classifiers are appropriate for classification problems with two class labels. For multi-class problems, decomposition techniques, like one-vs-one strategy, are used because they allow the use of binary classifiers. The ensemble selection, on the other hand, is one of the most studied topics in multiple classifier systems because a selected subset of base classifiers may perform better than the whole set of base classifiers. Thus, we propose a novel concept of the dynamic ensemble selection based on values of the score function used in the one-vs-one decomposition scheme. The proposed algorithm has been verified on a real dataset regarding the classification of cutting tools. The proposed approach is compared with the static ensemble selection method based on the integration of base classifiers in geometric space, which also uses the one-vs-one decomposition scheme. In addition, other base classification algorithms are used to compare results in the conducted experiments. The obtained results demonstrate the effectiveness of our approach.

3

Experimental and analytical research on relationship between tool life and vibration in cutting process

Ghorbani S., Kopilov V. V., Polushin N. I., Rogov V. A.

Archives of Civil and Mechanical Engineering

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2018

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Vol. 18, no. 3

844--862

EN

New identification and evaluation techniques for machining systems lead to an increase in the efficiency of a production system. This paper presents relationship between tool life, design features, fatigue strength and parameters of vibrations. To cope with this objective, vibration influence on tool wear is assessed, which considers the phase shift of vibration in different coordinates and forces on rake and rear faces of the tool. Tool life is predicted based on fatigue strength of tool material and parameters of tool vibrations. Static and dynamic characteristics of cutting tools during different machining conditions are analyzed using different cutting tools. Test results of cutting tools with different clamping types during static, dynamic and cutting processes, together with the simulation results suggest a relationship between the characteristics of the tool, the elastic system vibrations and tool life.

4

Improvement of cutting tool performance during machining process by using different shim

Rogov V. A., Ghorbani S., Popikov A. N., Polushin N. I.

Archives of Civil and Mechanical Engineering

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2017

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Vol. 17, no. 3

694--710

EN

Modern metal processing is characterized by high spindle speed machines causing high frequency vibrations. This significantly increases the requirements for stiffness and damping of cutting tool. The purpose of this study is to improve the quality of machined surface and the efficiency of hard turning using shim with high damping properties in the clamp set of insert. Five shims made of ceramic, epoxy granite, sandstone, granite and chlorite schist are proposed. Computer simulation and experimental investigation are provided to analysis the state of stress–strain in clamp set construction of insert. Static and dynamic characteristics of cutting tool with shim made of different materials are studied. In addition, the relationship between vibro-acoustic signal and material of the shim, wear of cutting edge, surface roughness and cutting conditions during hard turning are analyzed. It is concluded that using shim made of epoxy granite and sandstone improved damping capacity of the cutting tool and surface roughness by reducing vibration during machining process.

5

Procesy zużycia według schematu „narzędzie tnące – stopy tytanu”

Korbut E., Wajs E., Radko W., Labunec W. F., Zagrebelny W.

Obróbka Metalu

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2015

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nr 1

36--39

PL

W artykule ukazano podstawowe typy zużycia narzędzia tnącego podczas obróbki jednego z różnorodnych trudnoobrabialnych materiałów – stopów na osnowie tytanu.

EN

The article shown wear processes during cutting of difficult materials, which are titanium alloys. also brought closer to the surface phenomena of friction contact surfaces of the cutting tool and the workpiece.

6

Analysis of the wear tools made of cubic boron nitride for turning of the hardened steel

Dasic P. V., Radovanovic M.

International Journal of Applied Mechanics and Engineering

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2002

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Vol. 7, Spec. is

341-346

EN

Involving and application of modern cutting tools and new cutting materials as are, for example, cubic boron nitride (CBN), present simple means for reduction of costs of metalworking cutting. In this paper is given classification of materials for modern cutting tools and the experimental research of the function of wear tool from CBN for finished turning of hardened steel 20CrMo5 for different cutting speeds on concrete production conditions. Experimental data for the different values of the cutting speed is approximation by complex power-exponential regression and its correlation coefficient in all example is greater than 0.99.