Difference between revisions of "Static oil pressure gradient estimation"
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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> | ||
| − | + | where: | |
| − | + | * P<sub>oil grad</sub> = oil pressure gradient | |
| − | * | + | * ρ<sub>oil</sub> = oil density |
| − | |||
|} | |} | ||
Revision as of 15:31, 30 January 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.
| Step | Action |
|---|---|
| 1 | Estimate oil density using Figure 5-7 below. |
| 2 | Estimate oil pressure gradient using the following formula:
where:
|
Determining oil density[edit]
Use the figure below 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
- Finding free-water level using pressure
References[edit]
External links[edit]
| find literature about Static oil pressure gradient estimation |
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