Wax deposition in horizontal wells

Ozbayoglu, M.E.
Demiral, B.
Kök, Mustafa Verşan
In this research, wax deposition in horizontal well bores was studied. In a horizontal well, the main mechanism for wax appearance is the pressure change rather than the temperature change. Six different thermodynamic models were improved for horizontal wells by adding a pressure function, and a computer program was developed to simulate the precipitation phenomena in horizontal wells. Solid-liquid equilibrium constants for each pseudo-component were calculated. Critical pressures and overall solid mole factions of the crude oil at different error ranges are determined. In addition to these, the changes in productivity index due to wax deposition for steady stare and pseudo-steady state conditions were examined by the addition of a "wax factor". It was observed that pressure change was slightly effective on wax appearance in horizontal wells.
Petroleum Science and Technology


Wax appearance temperature (WAT) determinations of different origin crude oils by differential scanning calorimetry
Kök, Mustafa Verşan; Nurgaliev, Danis K. (2018-09-01)
In this research, wax appearance temperatures (WAT) of eight different crude oils from south-eastern region of Turkey were determined by differential scanning calorimetry. The experiments were performed at a heating/ cooling-rate of 2 degrees C/min from 60 to -20 degrees C It was observed that the wax appearance temperature of different origin crude oils was varied between 14.2 and 37.8 degrees C depending on the API gravity and wax content. It was also observed that the crude oils have enthalpy of precipit...
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Comparison of wax deposition in vertical and horizontal oil production wells
Özbayoglu, Evren; Demiral, M. R. Birol; Kök, Mustafa Verşan (2000-01-01)
In this study, wax deposition in horizontal well bores and vertical well bores is compared. In a vertical well, the temperature change is the dominant mechanism for wax deposition; however, in a horizontal well, the main mechanism for wax appearance is the pressure change. Six different thermodynamic models, developed originally for vertical wells by other researchers, were improved for horizontal wells by modifying with a pressure function, and a computer program was developed to simulate the precipitation...
Comparative methods in the determination of wax content and pour points of crude oils
Kök, Mustafa Verşan; Claudy, P. (2007-12-01)
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Citation Formats
M. E. Ozbayoglu, B. Demiral, and M. V. Kök, “Wax deposition in horizontal wells,” Petroleum Science and Technology, pp. 177–193, 2000, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/33236.