Promediando curvas de permeabilidad relativa en yacimientos de metano en mantos de carbón con flujo bifásico en Queensland, Australia.

  • Jorge Ordóñez Universidad Estatal Península de Santa Elena
  • José Villegas Universidad Estatal Península de Santa Elena
  • Alamir Alvarez Universidad Estatal Península de Santa Elena

Resumen

En el presente trabajo se propone el uso de un único set de curvas de permeabilidad a ser empleado en los estudios de simulación y caracterización de yacimientos de gas en mantos de carbón (CBM), en vez del uso común de un set de curvas para cada estrato individual. Para comprobar la aplicabilidad de este procedimiento, se simula un yacimiento usando ambos métodos: el resultado de producción debe ser similar en ambas simulacionesEl modelo para promediar la permeabilidad absoluta en un flujo monofásico, fue usado para el caso de predecir un promedio de permeabilidad relativa para un yacimiento con flujo bifásico. Luego de correr varios casos y corroborar que la ecuación propuesta no cumplía las expectativas, el enfoque del trabajo fue explicar el por qué del no funcionamiento de la ecuación propuesta. Una posible explicación fue la no consideración de la gravedad, que acorde a varias simulaciones presentadas, es un parámetro principal en las curvas de producción. La saturación de agua tampoco puede excluirse de la ecuación que prediga este promedio.  Por tanto si se quiere presentar una ecuación para el cálculo de promedio de permeabilidades relativas, es fundamental que tanto la gravedad como la saturación de agua estén incluidas en esta ecuación.


Abstract 

This paper tries to average relative permeability in a way that instead of using different sets of relative permeability curves to different layers, one single set could be used in one single layer, and to get similar production results as if different layers and different relative permeability were used instead. The model to average absolute permeability in a single-phase flow system was used to predict two-phase flow average relative permeability. After running different cases and corroborating that the equation proposed did not match the expectations. The focus of this work was changed in order to explain why the equation was not working. A possible explanation of why the equation is not accurate could be that the equation is not considering the influence of gravity. Gravity plays a very important role in reservoirs. After gas desorption process occurs, free gas migrates to top layers and water migrates to bottom layers. Water saturation could not be excluded from the equation that averages relative permeability curves. The effects of gravity should be considered too, if you want to get an equation to predict production behaviour by using one average equation in a single layer.

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Biografía del autor

Jorge Ordóñez, Universidad Estatal Península de Santa Elena
Facultad de Ciencias de la Ingeniería
José Villegas, Universidad Estatal Península de Santa Elena
Facultad de Ciencias de la Ingeniería
Alamir Alvarez, Universidad Estatal Península de Santa Elena
Facultad de Ciencias de la Ingeniería

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Publicado
2017-05-25
How to Cite
ORDÓÑEZ, Jorge; VILLEGAS, José; ALVAREZ, Alamir. Promediando curvas de permeabilidad relativa en yacimientos de metano en mantos de carbón con flujo bifásico en Queensland, Australia.. Revista Científica y Tecnológica UPSE, [S.l.], v. 4, n. 1, p. 129-140, mayo 2017. ISSN 1390-7697. Disponible en: <http://incyt.upse.edu.ec/revistas/index.php/rctu/article/view/250>. Fecha de acceso: 12 dic. 2017 doi: https://doi.org/10.26423/rctu.v4i1.250.

Palabras clave

Curvas de permeabilidad relativa; yacimiento con flujo bifásico; saturación de agua; reservorios de gas de carbono; curvas de producción