Natural Gas Dehydration Process Simulation and Optimization: A Case study of Khurmala Field in Iraqi Kurdistan Region

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Author(s) R. K. Abdulrahman | I. M. Sebastine | F. Z. Hanna
Pages 43-47
Volume 4
Issue 1
Date January, 2014
Keywords Natural gas dehydration, Khurmal dome, glycol, process simulation, Aspen Hysys, process optimisation.

Abstract

Natural gas is the most important & popular fossil fuel in the current era and future as well. Raw natural gas exists in deep underground reservoirs under certain temperature & pressure. Therefore, it may content several of non-hydrocarbon components for example, hydrogen sulphide, nitrogen and water vapour. In order to meet gas sale contract specifications, these impurities should be removed or reduced. Indeed, non- hydrocarbons components usually cause several technical problems for example, corrosion and environment pollution. Khurmala dome is located in southwest Erbil-Kurdistan region. The Kurdistan region government has paid great attention for this dome to provide the fuel for Kurdistan region. However, the Khurmala associated natural gas is currently flaring at the field. Khurmala gas could be recovered and utilized either as feedstock to power station or to sell it in global market. However, the laboratory analysis has showed that the Khurmala sour gas has huge quantities of H2S about (5.3%) and CO2 about (4.4%). Indeed, Khurmala gas sweetening process has been achieved in previous study by using Aspen HYSYS. However, Khurmala sweet gas still contents some quintets of water about 23 ppm. This amount of water vapour should be removed or reduced. Indeed, water contents in natural gas cause several technical problems for example, hydrates and corrosion. Therefore, this study aims to simulate the prospective Khurmala gas dehydration process by using Aspen HYSYS program. Moreover, the simulation process succeeds in reducing the water content to less than 0.1 ppm. In addition, the simulation work is also achieved process optimization to find out the most effective glycol type to remove the water vapour from natural gas stream by adopting several desiccant types for example, TEG and DEG.

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