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

Abstract

In the primary processing of oil in offshore units, each fluid coming from the producing wells (oil, water and gas) is treated in equipment to meet legal, regulatory and technical requirements. In addition to this equipment, a unit for dehydrating the gas produced with triethylene glycol (TEG) is usually used to separate the water, reducing the gas's humidity. The gas produced must meet the technical humidity requirements so that there are no flow problems due to the formation of hydrates or corrosion in the pipelines during the transportation of this fluid through the export pipelines and in the gas lift line. This work analyzes the Natural Gas dehydration unit produced with TEG in a real PEU is analyzed. The Aspen HYSYS® v11.0 process simulator is used to verify the current to verify the current parameters and thus propose better operating conditions in order to optimize the gas conditioning stage, which is so important for the continuity of production. The TEG dehydration process is subject to various adjustments that can reduce absorbent fluid and gas losses, reduce pollutant emissions, reduce energy consumption emission, reduction in energy consumed, increase in water absorption, in short, the operational efficiency of the entire unit. The results of the simulations show that the unit in question is susceptible to a reduction of up to 70% in the reduction of TEG losses, a reduction in methane emissions into the atmosphere of 112.8 tons per year resulting from a reduction in the use of stripping gas from 3000 m 3 /d to 2500 m 3 /d, as well as a 16% reduction in the unit's energy demand. The project requires a total capital investment of approximately US $ 11,000,000.00. (TRADUÇAO NOSSA)