Aplicación de modelos para la generación de la isoterma de adsorción de metano en una muestra de shale y su impacto en el cálculo de reservas
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Universidad Industrial de Santander
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el comportamiento de diferentes modelos de isotermas de adsorción aplicados a los datos experimentales obtenidos por Gasparik et al. (2012) en una prueba de adsorción de metano, fue modelado y analizado, con el fi n de determinar el que mejor representa los datos experimentales. entre los modelos utilizados se encuentran algunos de dos parámetros como Langmuir, temkin y freundlich, otros de tres parámetros como Langmuir, DubininRadushkevich, Toth y Sips; de cuatro parámetros como Dubinin-Astakhov y Fritz-Schlunder y fi nalmente el modelo de cinco parámetros propuesto por fritz-schlunder. según los resultados obtenidos, los modelos presentaron mejor ajuste a medida que empleaban mayor número de parámetros en sus ecuaciones.
Posteriormente se calculó la capacidad de almacenamiento total de gas para una formación hipotética con algunos datos de la formación Posidonea empleando el método propuesto por Ambrose et al (2010), el cual se modifi có reemplazando el término que tiene en cuenta el gas adsorbido con los modelos mencionados anteriormente, a fi n de determinar su infl uencia en las estimaciones de volumen de gas libre y de gas adsorbido. Con los modelos que presentaron un menor porcentaje de error, se obtuvieron datos más conservadores en el cálculo del gas adsorbido y de gas total, lo cual indica la importancia de la adecuada selección del modelo para el cálculo de reservas, dado que conlleva alto impacto técnico y económico.
Several adsorption isotherm models were analyzed for the purpose of fi tting the experimental data published by Gasparik et al. (2012) obtained in a methane adsorption experiment on a shale sample from the Posidonea formation in the netherlands. the following are the ten models used in this study; some of them consist of two parameters such as Langmuir, temkin and freundlich, the three parameter models: Langmuir, DubininRadushkevich, Toth and Sips, four parameters: Dubinin-Astakhov and Fritz-Schlunder and the fi ve-parameter Fritz Schlunder correlation. The results show a better fi t to the experimental data for those models with the highest number of parameters. Subsequently, The total gas storage capacity in a hypothetical formation was calculated using some data of the Posidonea formation and the methodology proposed by Ambrose et al (2010), which was modified afterwards by substituting the term taking into account the adsorbed gas for the models mentioned earlier in this article in order to determine their influence in the free and adsorbed gas calculations. In this way, the models with the lowest Average Percentage Error (APE) generally calculated a lower volume of adsorbed and total gas compared to those models with the highest APE, which indicates the importance of a proper model selection for calculating reserves, since it implies high technical and economic impact.
Several adsorption isotherm models were analyzed for the purpose of fi tting the experimental data published by Gasparik et al. (2012) obtained in a methane adsorption experiment on a shale sample from the Posidonea formation in the netherlands. the following are the ten models used in this study; some of them consist of two parameters such as Langmuir, temkin and freundlich, the three parameter models: Langmuir, DubininRadushkevich, Toth and Sips, four parameters: Dubinin-Astakhov and Fritz-Schlunder and the fi ve-parameter Fritz Schlunder correlation. The results show a better fi t to the experimental data for those models with the highest number of parameters. Subsequently, The total gas storage capacity in a hypothetical formation was calculated using some data of the Posidonea formation and the methodology proposed by Ambrose et al (2010), which was modified afterwards by substituting the term taking into account the adsorbed gas for the models mentioned earlier in this article in order to determine their influence in the free and adsorbed gas calculations. In this way, the models with the lowest Average Percentage Error (APE) generally calculated a lower volume of adsorbed and total gas compared to those models with the highest APE, which indicates the importance of a proper model selection for calculating reserves, since it implies high technical and economic impact.
Keywords
Shale, Gas, Reservoir, Isotherms, Adsorption, Shale, Gas, Yacimiento, Isotermas, Adsorción