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Título del libro: Society Of Petroleum Engineers - Spe California Regional Meeting, Crm 1981
Título del capítulo: New storage phenomena in high drawdown gas well buildup

Autores UNAM:
HEBER CINCO LEY;
Autores externos:

Idioma:
Inglés
Año de publicación:
1981
Palabras clave:

Boreholes; Liquids; Natural gas wells; Oil field equipment; Oil wells; Build-up curves; Extreme pressure; High pressure; Liquid solution; Pressure build up; Pseudo pressure; Very low permeability; Well bore storage; Digital storage


Resumen:

Strange behavior has been noticed in pressure buildup curves for gas wells producing from very low permeability, high drawdown formations. The typical unit slope on a log-log graph of real gas pseudo-pressure m(p) vs time for wellbore storage-dominated data becomes very steep (greater than unity) before going through a transition to the semilog straight line. A study of this behavior was made by means of a one-dimensional radial mathematical model wherein wellbore storage is treated rigorously. It was detected tnat buildup cases cnaracterxz ed by moderate to high pressure drawdown before shut-in always exhibit a shift of the conventional log-log graph to a larger value of the dimensionless wellbore storage constant, compared to the liquid solution. The typical unit slope in the wellbore storage control period is still preserved, and after that period, the buildup curve coincides smoothly with the constant physical properties liquid case. In extreme pressure drawdown cases, in addition, a more significant shift is also followed by a steepening towards the liquid solution. © 1981, Society of Petroleum Engineers.


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