Optimização dos parâmetros críticos do processo de desidratação de gás natural por Tri-etileno-glicol

Abstract

In the primary processing of petroleum in offshore units, each fluid originating of producing wells (oil, water and gas) is treated in equipment in order to meet legal, regulatory and technical requirements. In addition to this equipment, a unit dehydration of gas produced with triethylene glycol (TEG) is normally used in the separation of water, reducing the humidity of the gas. The gas produced must meet the technical humidity requirements, so that drainage problems do not occur due to formation of hydrates or corrosion in gas pipelines, during the transport of this fluid through export pipelines and gas lift line. In this work, the Natural Gas dehydration unit produced with TEG in a real UEP. The Aspen HYSYS® v11.0 process simulator is used to check the current parameters and thus propose better operating conditions, in order to optimize the gas conditioning stage, so important for the continuity of production. The dehydration process with TEG is subject to several adjustments that can promote reduction of losses of absorbent fluid, gas, reduction of emission of pollutants, reduction of energy consumed, increased water absorption, in short, the operational efficiency of the entire unit. The result of the simulations shows that the unit in question is capable of a reduction of up to 70% in the reduction of energy losses TEG, reduction in methane emissions into the atmosphere of 112.8 tons per year resulting from the reduction in the use of stripping gas of 3000 m3 /d for 2500 m3 /d, in addition to reducing the unit's energy demand by 16%. The project requires a total capital investment of approximately US$ 11,000,000.00 (TRADUÇÃO NOSSA).