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Static oil pressure gradient estimation (view source)
Revision as of 21:22, 29 January 2014
, 21:22, 29 January 2014Initial import
{{publication
| image = exploring-for-oil-and-gas-traps.png
| width = 120px
| series = Treatise in Petroleum Geology
| title = Exploring for Oil and Gas Traps
| part = Critical elements of the petroleum system
| chapter = Formation fluid pressure and its application
| frompg = 5-1
| topg = 5-64
| author = Edward A. Beaumont, Forrest Fiedler
| link = http://archives.datapages.com/data/specpubs/beaumont/ch05/ch05.htm
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
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.<ref name=ch05r15>Schowalter, T., T., 1979, 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.</ref>
==Estimating oil pressure gradients==
Follow the steps listed below to estimate static oil pressure gradient.
{| class = "wikitable"
|-
! Step
! Action
|-
| 1
| Estimate oil density using Figure 5-7 below.
|-
| 2
| Estimate oil pressure gradient using the following formula:
:<math>\mbox{P}_{\rm oil\ grad} = \rho_{\rm oil} \times 0.433 \mbox{ psi/ft}</math>
<break> </break> where:
* <sup>P</sup><sub>oil grad</sub> = oil pressure gradient * ρ<sub>oil</sub> = oil density
|}
==Determining oil density==
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.
[[file:formation-fluid-pressure-and-its-application_fig5-7.png|thumb|{{figure number|5-7}}.]]
==See also==
* [[Static hydrocarbon pressure gradients]]
* [[Estimating static gas pressure gradients]]
* [[Plotting the hydrocarbon pressure gradient]]
* [[Finding free-water level using pressure]]
==References==
{{reflist}}
==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch05/ch05.htm Original content in Datapages]
* [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store]
[[Category:Critical elements of the petroleum system]]
[[Category:Formation fluid pressure and its application]]
| image = exploring-for-oil-and-gas-traps.png
| width = 120px
| series = Treatise in Petroleum Geology
| title = Exploring for Oil and Gas Traps
| part = Critical elements of the petroleum system
| chapter = Formation fluid pressure and its application
| frompg = 5-1
| topg = 5-64
| author = Edward A. Beaumont, Forrest Fiedler
| link = http://archives.datapages.com/data/specpubs/beaumont/ch05/ch05.htm
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
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.<ref name=ch05r15>Schowalter, T., T., 1979, 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.</ref>
==Estimating oil pressure gradients==
Follow the steps listed below to estimate static oil pressure gradient.
{| class = "wikitable"
|-
! Step
! Action
|-
| 1
| Estimate oil density using Figure 5-7 below.
|-
| 2
| Estimate oil pressure gradient using the following formula:
:<math>\mbox{P}_{\rm oil\ grad} = \rho_{\rm oil} \times 0.433 \mbox{ psi/ft}</math>
<break> </break> where:
* <sup>P</sup><sub>oil grad</sub> = oil pressure gradient * ρ<sub>oil</sub> = oil density
|}
==Determining oil density==
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.
[[file:formation-fluid-pressure-and-its-application_fig5-7.png|thumb|{{figure number|5-7}}.]]
==See also==
* [[Static hydrocarbon pressure gradients]]
* [[Estimating static gas pressure gradients]]
* [[Plotting the hydrocarbon pressure gradient]]
* [[Finding free-water level using pressure]]
==References==
{{reflist}}
==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch05/ch05.htm Original content in Datapages]
* [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store]
[[Category:Critical elements of the petroleum system]]
[[Category:Formation fluid pressure and its application]]