Difference between revisions of "Static oil pressure gradient estimation"
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Follow the steps listed below to estimate static oil pressure gradient. | Follow the steps listed below to estimate static oil pressure gradient. | ||
− | + | # Estimate oil density using Figure 1. | |
− | + | # Estimate oil pressure gradient using the following formula: | |
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:<math>\mbox{P}_{\rm oil\ grad} = \rho_{\rm oil} \times 0.433 \mbox{ psi/ft}</math> | :<math>\mbox{P}_{\rm oil\ grad} = \rho_{\rm oil} \times 0.433 \mbox{ psi/ft}</math> | ||
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* P<sub>oil grad</sub> = oil pressure gradient | * P<sub>oil grad</sub> = oil pressure gradient | ||
* ρ<sub>oil</sub> = oil density | * ρ<sub>oil</sub> = oil density | ||
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==Determining oil density== | ==Determining oil density== |
Revision as of 14:44, 7 November 2014
Exploring for Oil and Gas Traps | |
Series | Treatise in Petroleum Geology |
---|---|
Part | Critical elements of the petroleum system |
Chapter | Formation fluid pressure and its application |
Author | Edward A. Beaumont, Forrest Fiedler |
Link | Web page |
Store | AAPG Store |
The static oil pressure gradient is dependent on oil density. Subsurface density of oil or condensate depends on composition, amount of dissolved gases, temperature, and pressure. Oil or condensate density can be estimated to useful accuracy if stock tank API gravity and solution gas-oil ratio (GOR) are known.[1]
Estimating oil pressure gradients[edit]
Follow the steps listed below to estimate static oil pressure gradient.
- Estimate oil density using Figure 1.
- Estimate oil pressure gradient using the following formula:
where:
- Poil grad = oil pressure gradient
- ρoil = oil density
Determining oil density[edit]
Use Figure 1 to determine oil density. If the GOR is unknown or if there is no dissolved gas in the oil, use the 0 line.
See also[edit]
- Static hydrocarbon pressure gradients
- Estimating static gas pressure gradients
- Plotting the hydrocarbon pressure gradient
- Free water level determination using pressure
References[edit]
- ↑ Schowalter, T., T., 1979, gas-oil ratio (GOR)s.datapages.com/data/bulletns/1977-79/data/pg/0063/0005/0700/0723.htm Mechanics of secondary hydrocarbon migration and entrapment: AAPG Bulletin, vol. 63, no. 5, p. 723–760. Covers many fluid behavior principles, including pressure, with broad application to petroleum exploration.