Improving the Thermodynamic Properties of Export Gas Through Condensate Spiking

P. Oviawele, S. Onwukwe, N. Nwachukwu, I. Onyejekwe
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Abstract

Disposal of condensate produced from stranded gas field have been a major concern to producing companies due to unavailability of nearby oil flow stations to receive the condensate, which have resulted to abandonment of such fields. This work seek to improve the thermodynamic properties (Heat Capacity, Heating Value, Specific Heat capacity, Heat of Vaporization and Enthalpy) of the export gas through condensate spiking. This was carried out by simulating a natural gas plant, consisting of condensate line and spiking mixer. The simulation was done using Aspen HYSYS, to include the point at which the condensate stream was spiked into the high-pressure dry natural gas stream. Phase envelope and hydrate formation curve for the streams (dry natural gas and the mixture after spiking) were obtained. Case study in HYSYS was used to carry out Sensitivity analysis, to determine the effect of temperature, pressure and flow rate of the condensate on the mixture (export gas). Economic analysis of the project was carried out. Results obtained from the thermodynamic analysis shows that the thermodynamic properties of the export gas after spiking improves, such that the heating value and enthalpy of the export gas increases. The phase envelops shows that hydrate will not form in the export gas streams. Through the sensitivity analyses, the effect of variation in the parameters of the condensate shows that the vapour fraction of the export gas increases as the temperature increase and decrease as the pressure increases. The maximum condensate flow rate was obtained to be 12,500 bbl/day, at a dry gas flow rate of 382.2 MMScfd, for a maximum vapour fraction of 0.953, with this operating parameters, flow assurance problem of hydrate formation, liquid holdup and high pressure drops along the pipeline with be eliminated. Hydrocarbon dew point of −13.41°C was obtained showing that liquid hydrocarbon will not condense out of the gas during transportation. Economic analysis shows that the NPV and IRR are $432.778 million and 33%, indicating that the project is viable for investment. Therefore, it is possible to spike condensate into treated export gas without causing flow assurance problems, and helps mitigate against risk associated with environmental pollution.
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通过凝析油加注改善出口天然气热力学性质
废弃气田产生的凝析油的处理一直是生产公司关注的主要问题,因为附近的油站无法接收凝析油,这导致了这些油田的放弃。本工作旨在通过凝析气加注提高出口天然气的热力学性能(热容量、热值、比热容、汽化热和焓)。通过模拟一个天然气装置,包括凝结水管线和喷淋混合器,进行了实验研究。模拟使用Aspen HYSYS进行,包括凝析液流进入高压干燥天然气流的点。得到了各流(干天然气和加气后的混合物)的相包络和水合物形成曲线。以HYSYS为例进行灵敏度分析,确定冷凝液的温度、压力和流量对混合气(出口气体)的影响。对该工程进行了经济分析。热力学分析结果表明,喷峰后出口气体的热力学性质得到改善,出口气体的热值和焓增大。相包络图表明,在出口气流中不会形成水合物。通过灵敏度分析,对凝析油参数变化的影响表明,出口气体的汽相分数随温度升高而升高,随压力升高而降低。在干气流量为382.2 MMScfd、最大蒸汽分数为0.953的条件下,最大凝析液流量为12,500桶/天,在此运行参数下,水合物形成、液含率和管道沿线高压降等流动保证问题得以消除。烃类露点为- 13.41°C,表明液态烃类在运输过程中不会凝结出气体。经经济分析,该项目净现值为4327.78万美元,内部收益率为33%,具有投资可行性。因此,可以将凝析油注入处理后的出口天然气中,而不会造成流量保证问题,并有助于减轻与环境污染相关的风险。
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