الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The formation of gas hydrates causes serious operational and safety problems to oil and gas industry. Hydrates can plug gas pipelines, Wellbore and processing units leading to production loss, pipelines rupture and explosion. The hydrate prevention requires investments up to 10 to 15% of the total production cost. Several techniques used for natural gas hydrate prevention. The most common technique used for hydrate prevention is chemical injection. Many chemicals injected to gas pipeline to decrease hydrate formation temperature and prevent hydrate formation. These chemicals are called hydrate inhibitors. The most chemicals used are thermodynamic hydrate inhibitors (THIs) like mono-ethylene glycol and methanol. Salt is one of thermo dynamic hydrate inhibitors and have the same effect as methanol and MEG. The aim of our work is to conduct a simulation study to determine the effect of mixed THIs like (MEG+NaCL) & (MEG+KCL) and (Methanol +NaCL) & (Methanol +KCL) on gas hydrates at different pressures and temperatures. We studied the hydrate inhibition for each inhibitor alone compared the results with the mixed THI .The effect on hydrate formation temperature and the required amount of inhibitor for different cases were studied. The simulation software used to complete this study was Aspen Tech HYSYS. The data used are collected from Zohr gas field located at north of Egypt. The results show that hydrate inhibition is gained by using combination of two or more thermodynamic inhibitors. Applying mixed thermodynamic inhibitors to prevent hydrate formation has shown to be more economical and environmental friendly. Using mixed inhibitors will reduce hazards of (MEG & Methanol) and reduce the potential of environment pollution resulting from (MEG & Methanol) disposal as the used quantities of (MEG & Methanol) are reduced.