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Increase of the technogenic and ecological safety of the natural gas transportation due to displacement of explosive mixtures with nitrogen

Mandryk O., Vytyaz O., Poberezhny L., Mykhailiuk Y.

Archives of Materials Science and Engineering

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2020

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Vol. 106, nr 1

17--27

EN

Purpose: To ensure technological and environmental safety it is proposed to use the technology of purging pipeline with compressed nitrogen. Design/methodology/approach: The purpose of the calculation is: to get the graph of the concentration distribution (in volume fraction) of nitrogen and natural gas components depending on the distance from the injection point of nitrogen and the duration of the purge process, to determine of parameters of a non-stationary process, and to establish the optimal parameters of the purging process under conditions of the given flow chart. Findings: In the process of displacement of natural gas, the velocity of the front of nitrogen is one of the main quantities that significantly affect the quality of displacement. To assess the actual technological schemes for transporting natural gas, it is necessary to select the velocity of displacement of explosive mixtures. Research limitations/implications: This technology should be implemented in the conditions of a nitrogen pressure higher than 0.25 MPa. Practical implications: Most favourable conditions for the complete displacement of air and subsequent replacement of nitrogen with natural gas were observed for pressures higher from 1.0 to 1.5 MPa. Originality/value: Complex calculations of the volume of air displaced with nitrogen and natural gas in the process of filling the pipeline were conducted in the research. Boundary conditions on the concentration of the mixture of nitrogen and natural gas were identified.

2

Zaczyny uszczelniające ograniczające ekshalacje gazu ziemnego z przestrzeni pierścieniowej otworu wiertniczego

Ziaja J., Stryczek S., Jamrozik A., Knez D., Czarnota R., Vytyaz O.

Przemysł Chemiczny

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2017

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T. 96, nr 5

990--992

PL

Opracowano oryginalne receptury cementowych zaczynów uszczelniających pozwalające na minimalizację pozarurowych ekshalacji gazu. Zastosowano materiał zwiększający objętość kamienia cementowego DR 100 oraz lateks w celu zmniejszenia jego przepuszczalności dla gazu. Badania wykonano w laboratoriach AGH i na Ukrainie. Na podstawie wyników badań doświadczalnych sformułowano warunki stosowania przebadanych dodatków i zalecane ich zawartości.

EN

Cement slurries were modified by addn. of a dispersing agent (Ca silicate) 6-8% and a butadiene-styrene-amide latex (15-20%) to decrease the permeability of the sealing. The optimum contents of the agent and latex were 6% and 20% by mass, resp.

3

Prediction of conditions of longterm operated drill pipes failure

Vytyaz O.

AGH Drilling, Oil, Gas

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2017

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Vol. 34, no. 1

15--26

EN

An experimental assessment of the force criterion for metal failure of longterm drill pipes operation wascarried out. Defined were the conditions under which during tripping the failure of longterm operated drillpipes is possible when they contain an external or internal circumferential transverse crack. The interrelationof critical external or internal circumferential transverse cracks in drill pipes to the drilling stringweight was established. It was shown that the internal cross cracks during drilling string tripping at depthsexceeding 3000 m are more dangerous than the external ones, whereas within the range of 1000–3000 m the external circumferential transverse cracks are more dangerous.

4

Prospects for the development of hydrate storage and transportation technology of methane gas

Pavlenko A., Koshlak H., Vytyaz O., Rybicki Cz.

AGH Drilling, Oil, Gas

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2015

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Vol. 32, no. 1

13--21

EN

The gas hydrate tecłmologies can be alternative to the traditional methods of the rational use of hydrocarbon gases. However the known constructions of apparatuses for the production of gas hydrates cannot satisfy the condition of their industrial use fully. Authors offer to carry out the high-quality contact of gas and water at formation of gas hydrate by jet apparatuses with a free falling jet. On their basis a technological chart is offered for realization of continuous cycle of production of gas hydrate. The aim is to develop technical solutions and process parameters of continuous production of gas hydrates, which would satisfy the requirements of industrial application

5

Study of the stability of methane hydrates in normal conditions

Pavlenko A., Koshlak V., Vytyaz O.

AGH Drilling, Oil, Gas

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2014

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Vol. 31, no. 4

495--505

EN

The problems of accumulation, transport and storage of gases and gas mixtures exist in many cases. Often the existent technologies appear ineffective for transporting his with pipelines, as condensate or compressed gas. Therefore, the transportation and storage of gas in hydrate form can be an alternative to traditional technologies. Preservation of gas hydrate blocks can store them for some time at the no equilibrium conditions. The thermodynamic parameters of forcibly conservation of gas hydrate blocks theoretically are determined and experimentally verified.

6

The use of the spatial characteristics technique with the view of estimating the explosion wave impact on the stuck drilling string zone

Moisyshyn V., Yacyshyn V., Vytyaz O.

Archives of Mining Sciences

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2012

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Vol. 57, no. 3

601--618

EN

Studied here are the results of the asymmetric problem solution of the thick walled circular cylinder elasticity using the spatial characteristics technique. The practical implementation of the solution of the problem is based on the calculation of the stress-caused deformation state of the stuck drilling string zone affected by the explosion wave action upon the inner wall of the pipe. Suggested here is the technique for determining axual and circular stress on the drill pipe wall as well as the radial displacements of the stuck drill pipe outer surface under the action of the explosion shock wave. The above technique enables to make a sound selection of the cylindrical explosive charge weight in order to avoid the residual strain during the drilling string shaping off and uncoupling the threaded joints or to prevent them from exceeding the admissible level.

PL

W artykule przedstawiono wyniki uzyskane przy pomocy asymetrycznego rozwiązania zagadnienia związanego z elastycznością grubościennego walca o przekroju kołowym, w oparciu o metodę charakterystyk przestrzennych. Praktyczne zastosowanie tego rozwiązania opiera się na obliczeniu stanu odkształcenia strefy przy przychwyconej w otworze kolumnie przewodów wiertniczych spowodowanego naprężeniami wskutek oddziaływania fali uderzeniowej na wewnętrzne ściany przewodów. W pracy zaproponowano metodę określenia naprężenia osiowego i obwodowego działającego na ściany przewodów wiertniczych oraz przemieszczenia promieniowego u umocowanego przewodu pod wpływem oddziaływania fali uderzeniowej po wybuchu. Technika powyższa umożliwia dokonanie właściwego doboru wielkości ładunku wybuchowego w kształcie walca w celu uniknięcia naprężeń resztkowych w kolumnie przewodów wiertniczych, które mogłyby doprowadzić do jego odkształcenia lub poluzowania połączeń gwintowanych lub dla utrzymania wielkości tych naprężeń w dopuszczalnych normach.