THEORETICAL MODEL FOR HYDROCARBON ACCUMULATION IN A DOME TAKING INTO ACCOUNT CONDENSATION, LIMITED BY HEAT TRANSFER

Autor: Svetlana R. Kildibaeva, Ilyas K. Gimaltdinov
Jazyk: ruština
Rok vydání: 2019
Předmět:
Zdroj: Известия Томского политехнического университета: Инжиниринг георесурсов, Vol 330, Iss 2, Pp 167-174 (2019)
Druh dokumentu: article
ISSN: 24131830
2500-1019
2413-1830
DOI: 10.18799/24131830/2019/2/117
Popis: The relevance of the research is related to the increase in the scale of hydrocarbon production in the offshore zone of the world ocean and the associated risks of accidental spills of hydrocarbons. In this regard, it is necessary to study the mathematical model of the dome, designed to eliminate deep-sea leaks. According to the formulation of the problem, the thermophysical characteristics of the environment correspond to the conditions of stable existence of hydrate. To describe hydrate formation on the surface of methane bubbles, a limit scheme is proposed, according to which hydrate formation is limited by heat exchange. In earlier works, the accumulation of hydrocarbons was considered, taking into account the hydrate formation limited by diffusion, which is another limiting case of describing hydrate formation. The main aim of the research is to study the features of hydrocarbon accumulation (oil, gas, hydrate) in the dome for the case when hydrate formation is limited by heat exchange with the environment. Object of research is a stream of hydrocarbons consisting of water, oil droplets, gas bubbles and composite bubbles, which leads to the accumulation of hydrocarbons in the dome when gets into it. The thermophysical characteristics of the environment correspond to the conditions of stable existence of hydrate. Methods. The mathematical model of hydrocarbon accumulation in the dome is constructed. For describing heat and mass transfer the authors have used the system of equations that includes conservation laws for mass of gas, oil and hydrate, equation of energy conservation for the layers of gas and oil, as well as auxiliary equations for calculating heat flows. Result. The paper considers the process of hydrocarbon accumulation in the dome in the case when hydrate formation on the surface of methane bubbles is limited by heat exchange. When the density of the composite bubbles greater than the that of oil, a layer of hydrate (formed composite bubbles) is accumulated between the layers of oil and water, in the case when the density of the bubble is less than that of oil, a layer of hydrate (formed composite bubbles) is accumulated between the layers of oil and gas. The authors determined the temperature field for hydrocarbons accumulated inside the dome. Over time, the temperature of the layers of gas and oil tend to temperature of oil and gas coming from the jet.
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