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Static oil pressure gradient estimation (view source)
Revision as of 15:18, 17 February 2022
, 15:18, 17 February 2022added Category:Treatise Handbook 3 using HotCat
| part = Critical elements of the petroleum system
| part = Critical elements of the petroleum system
| chapter = Formation fluid pressure and its application
| chapter = Formation fluid pressure and its application
| frompg = 5-1
| frompg = 5-20
| topg = 5-64
| topg = 5-25
| author = Edward A. Beaumont, Forrest Fiedler
| author = Edward A. Beaumont, Forrest Fiedler
| link = http://archives.datapages.com/data/specpubs/beaumont/ch05/ch05.htm
| link = http://archives.datapages.com/data/specpubs/beaumont/ch05/ch05.htm
| isbn = 0-89181-602-X
| 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, [http://archives.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.</ref>
The static oil pressure gradient is dependent on oil [[Wikipedia:Density|density]]. Subsurface density of oil or condensate depends on [[Oil composition|composition]], amount of [[dissolved gas]]es, [[Wikipedia:Temperature|temperature]], and [[Wikipedia:Pressure|pressure]]. [[Oil and condensate analysis|Oil or condensate density]] can be estimated to useful accuracy if stock tank [[API gravity]] and [[Petroleum reservoir fluid properties#Solution gas-oil ratio (GOR)|solution gas-oil ratio (GOR)]] are known.<ref name=ch05r15>Schowalter, T., T., 1979, [http://archiveSolution 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.</ref>
==Estimating oil pressure gradients==
==Estimating oil pressure gradients==
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:
:<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>
* 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
==Determining oil density==
==Determining oil density==
[[file:formation-fluid-pressure-and-its-application_fig5-7.png|thumb|{{figure number|1}}.]]
[[file:formation-fluid-pressure-and-its-application_fig5-7.png|300px|thumb|{{figure number|1}}Determining oil density.]]
Use [[:file:formation-fluid-pressure-and-its-application_fig5-7.png|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.
Use [[:file:formation-fluid-pressure-and-its-application_fig5-7.png|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.
* [[Estimating static gas pressure gradients]]
* [[Estimating static gas pressure gradients]]
* [[Plotting the hydrocarbon pressure gradient]]
* [[Plotting the hydrocarbon pressure gradient]]
* [[Finding free-water level using pressure]]
* [[Free water level determination using pressure]]
==References==
==References==
[[Category:Critical elements of the petroleum system]]
[[Category:Critical elements of the petroleum system]]
[[Category:Formation fluid pressure and its application]]
[[Category:Formation fluid pressure and its application]]
[[Category:Treatise Handbook 3]]