«Geology, geophysics and development of oil and gas fields»

Forecasting the conditions for the formation of gas hydrates in the pipelines of the Lavan oil refinery (Islamic Republic of Iran)

UDC: 622.(276+279).(55)
DOI: -

Authors:

¹ Perm National Research Polytechnic University, Perm, Russia

Keywords: natural gas reservoir, hydrate, well, phase equilibrium

Annotation:

Gas hydrates, or clathrate hydrates, are crystalline solid compounds whose properties and stability depend on pressure and temperature conditions. Under certain thermodynamic conditions, gas hydrates block the flow sections of the gas transportation infrastructure. Laboratory studies have been performed to determine the equilibrium pressure of hydrate formation at different temperatures for a two-component system (methane–water). Calculations on the stability analysis of gas hydrates for gas, coming from the Lavan refinery, were performed based on the method of temperature-programmed desorption to determine the thermodynamic conditions for the formation of gas hydrates. After determining the equilibrium pressure of hydrate formation at different temperatures, a pressure–temperature diagram is constructed. The results of determining the conditions of hydrate formation are compared with the data of the Heriot-Watt University thermodynamic model. It is noted that the calculations performed using temperature-programmed desorption have a deviation of no more than 3,51 % from laboratory data. Accordingly, the method of temperature-programmed desorption can be used to predict the conditions of hydrate formation.

Bibliography:

1. Ashkan A., Poplygin V.V. Prognozirovanie obrazovaniya gidratov pri razrabotke mestorozhdeniy prirodnogo gaza v Irane // Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy. – 2024. – № 6(390). – S. 57–62.
2. Dieng A., Poplygin V.V. Prognozirovanie debita gazovoy skvazhiny (na primere mestorozhdeniya Respubliki Senegal) // Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy. – 2024. – № 3(387). – S. 63–66.
3. Van der Waals J.H., Platteeuw J.C. Clathrate Solutions // Adv. Chem. Phys. – 1959.
4. Michelsen M.L. The Isothermal Flash Problem. Part I. Stability, Fluid Phase Equilibria. – 1982. – Pp. 1–19.
5. Valderrama J.O. A Generalized Patel-Teja Equation of State for Polar and Nonpolar Fluids and their Mixtures // J. Chem. Eng. Jpn. – 1990. – Pp. 87–91.
6. Avlonitis D., Danesh A., Todd A.C. Prediction of VL & VLL Equilibria of Mixtures Containing Petroleum Reservoir Fluids & Methanol with a Cubic EOS // Fluid Phase Equilibria. – 1994. – Vol. 94. – Pp. 181–216.
7. Avlonitis D. Thermodynamics of Gas Hydrat Equilibria // PhD. Thesis, Department of Petroleum Engineering. – Heriot-Watt University, Edinburgh, UK, 1992.