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Three-Phase Wet Sour Gas Transmission in a Pipeline


Keivan Tarighati, Mahdi Saeidi Boroujeni

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Keywords

Multi-Phase flow, Carbonate reservoirs, Hydrate Formation, pH Stabilization, Scaling

Abstract

The basis of a wet process scheme involves minimum offshore processing. The reservoir fluid is collected on a wellhead platform and routed without treatment via a three-phase subsea pipeline to the shore where it is processed to deliver gas and condensates at specifications. The concept and design will be applied to produce wet sour gas transmission from offshore to shore via a subsea pipeline, resulting in a lower capital investment. As a consequence two highly undesirable situations can exist at the same time, severe corrosion and hydrate blockage, leading to system failure and the complete shutdown of production. Therefore, both corrosion and hydrate inhibitors can be required to effectively treat these phenomena. A solution of monoethylene glycol (MEG) is used for hydrate prevention and an amine (methyldiethanolamine [MDEA]) will be added as a buffering agent to maintain pH at a neutralizing value to managed corrosion. This requires proper quality assurance of topside and subsea pipelines but will result in lower capital costs as well as lower operational costs. In the proposed “Three-Phase Wet Sour Gas Transmission in a Pipeline”, excellent engineering team will focus on the application of a pH control system for carbonate reservoirs in order to prevent scaling.