Areal average reservoir pressure around a given reservoir location
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Formation Pressure Defintion | Application | |||||||||||||||||||||||||||||||
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Shut-in formation pressure estimate based on a wellbore sandface pressure after a given well is shut-in for
| This definition is based on the practical observation of wellbore pressure in shut-in wells for well intervention purposes. It is the simplest and the most popular definition of formation pressure and is widely used in all upstream industry applications. The definition of shut-in time
Some conventions are to pick
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Boundary-average formation pressure estimate along the boundary of drainage area
where
| This definition is based on the idea that there is a boundary line
The advantage of this method over
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Field-average formation pressure estimate within the drainage area
| Well Flow Performance Analysis This definition is based on the productivity index estimate and assumption that it stays constant Historically this definition is marked with a different symbol
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9-cell formation pressure estimate from reservoir flow simulation model
| It defines formation pressure as an average of numerically calculated pressure values in 9 grid cells of reservoir flow simulation model It provides a very rough and often inaccurate estimate of formation pressure for planning new wells, workovers, well performance analysis and testing existing dynamic model against other estimates. It is widely used in history matching as input parameter to match with, which maybe highly controversal providing the difference in. |
See also
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[Reservoir pressure] [Initial formation pressure, Pi] [Drilled formation pressure, Pd] [Startup formation pressure, P0]
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