In this research, war, deposition in different crude oil pipeline systems was studied. In oil pipelines, the main mechanism for wax appearance is the temperature change along the pipeline. A computer program was developed to simulate the wax precipitation phenomena. Temperature profile along the pipeline was determined and solid liquid equilibrium constant, wax mole fraction and wax thickness along the pipeline were calculated. This computer program was applied to different crude oil pipeline systems in Iraq (Baiji-Daura, Rumaila-Zubair-Fao and Haditha-Rumailia). In Haditha-Rumaila crude oil pipeline system, it was observed that wax thickness after a year is approximately 0.1 mm and temperature declined from 303 K to around 300.5 K. The wax mole fraction after a year is approximately 0.2. The solid-liquid equilibrium constant for the first component around 0.228 and around 165 for the second component after a year. Similar results were observed in other crude oil pipeline systems studied.
Petroleum Science and Technology


Numerical simulation of unsteady flow in an oil pipeline under various hydraulic conditions
Turan, Emrah; Bozkuş, Zafer; Department of Civil Engineering (2006)
In the present study, transient flow analyses of a long oil pipeline are performed. Transient flow conditions are initiated by typical valve operations and pump trips that may be expected during operation of such pipelines. In order to simulate transient events an existing computer program called “Stoner Pipeline Simulator” has been used for a large number of hydraulic transient conditions. The program is based on the characteristics method solution of the governing water hammer equations. Locations that ma...
Risk assessment of petroleum transportation pipeline in some Turkish oil fields
Öğütçü, Gökçen; Akın, Serhat; Department of Petroleum and Natural Gas Engineering (2004)
In this thesis, quantitative risk assessment study of several oil field transportation lines that belong to a private oil production company located in S. East Turkey has been conducted. In order to achieve this goal, first primary risk drivers were identified. Then relative ranking of all pipeline segments were conducted. Quantitative risk assessment was based on Monte Carlo simulations and a relative scoring index approach. In these simulations frequency of occurrence of pipeline failures for different oi...
Economical Evaluation of an Oil Field Reservoir
Kök, Mustafa Verşan (Informa UK Limited, 2011-01-01)
In this study, economical evaluation of an oil field reservoir was performed using software. The software used in this study consists of different sub-programs to determine recoverable oil, recovery factor, initial and final productions, production rates, and original oil and gas in place for different types of reservoirs. Recovery efficiency was found to be 29% for water drive and 4.78% for solution gas drive reservoirs. In decline curve analysis, initial and final production rates were obtained as 40 and ...
Analysis of finite element method solution of sinusoidal buckling behaviour of drill string in vertical, directional, and horizontal wellbores and comparison with analytical solutions
Cebeci, Mehmet; Kök, Mustafa Verşan; Gücüyener, İ. Hakkı; Department of Petroleum and Natural Gas Engineering (2017)
The buckling of drill string in oil, gas and geothermal wells is a critical problem that has been of interest to many researchers in the industry. Prevention of buckling of drill string is important since it may negatively affect the drilling operations. When buckling of drill string occurs, it may cause deviation control problems while drilling, inefficient load transfer to the bit, excessive torque values, even pipe failures due to fatigue. The first rigorous treatment of stability of drill strings for ve...
Application of vapour extraction VAPEX process for light crude oil
Kök, Mustafa Verşan; Akın, Serhat (2008-01-01)
The objective of this study is to investigate the applicability of Vapex process on Garzan crude oil. Experiments were performed with Hele-Shaw cell using two different solvents (propane and butane) at three different injection rates (20, 40, and 80 ml/min). For both Vapex solvents, oil production rates increased with injection rates for Garzan crude oil. Instantaneous asphaltene rate for Garzan oil showed fluctuated performance with propane solvent. Butane showed almost constant degree of asphaltene precip...
Citation Formats
M. V. Kök, “MATHEMATICAL MODELLING OF WAX DEPOSITION IN CRUDE OIL PIPELINES (COMPARATIVE STUDY),” Petroleum Science and Technology, pp. 1121–1145, 2000, Accessed: 00, 2020. [Online]. Available: