Difference between revisions of "Predicting reservoir drive mechanism"
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| part = Predicting the occurrence of oil and gas traps | | part = Predicting the occurrence of oil and gas traps | ||
| chapter = Predicting reservoir system quality and performance | | chapter = Predicting reservoir system quality and performance | ||
− | | frompg = 9- | + | | frompg = 9-14 |
− | | topg = 9- | + | | topg = 9-16 |
| author = Dan J. Hartmann, Edward A. Beaumont | | author = Dan J. Hartmann, Edward A. Beaumont | ||
| link = http://archives.datapages.com/data/specpubs/beaumont/ch09/ch09.htm | | link = http://archives.datapages.com/data/specpubs/beaumont/ch09/ch09.htm | ||
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==Predicting drive type== | ==Predicting drive type== | ||
− | Reservoir analysis includes making cross | + | Reservoir analysis includes making [[cross section]]s, structural maps, and isopach maps. Analyzing nearby producing fields yields the best set of inferential data. This includes (1) making plots of historical oil, gas, condensate, and water production and pressure decline and (2) making cumulative production maps. When all available information has been assembled, find the drive type that best fits the prospective reservoir system. The table below summarizes typical characteristics of primary drive types. |
{| class = "wikitable" | {| class = "wikitable" | ||
Line 25: | Line 25: | ||
|- | |- | ||
| Water | | Water | ||
− | | * Quality of aquifer pore geometry comparable to reservoir pore geometry | + | | |
− | + | * Quality of aquifer pore geometry comparable to reservoir pore geometry | |
+ | * Aquifer volume at least 10 times greater than reservoir volume | ||
+ | * Flat to gradual production and pressure declines | ||
+ | * Gradually to rapidly increasing water production late in life of reservoir | ||
+ | * Early increasing water production from downdip wells | ||
+ | * GOR (gas–oil ratio) relatively constant | ||
+ | * High recovery factor (50% or more) | ||
|- | |- | ||
| Gas expansion | | Gas expansion | ||
− | | * Moderate drop in reservoir pressure | + | | |
− | + | * Moderate drop in reservoir pressure | |
+ | * Moderate production decline | ||
+ | * Water-free production (or relatively minor) | ||
+ | * GOR flat for first 50% of production, then increases | ||
+ | * GOR increases rapidly in structurally high wells | ||
+ | * Moderate recovery factor (typically 30%) | ||
|- | |- | ||
| Solution gas | | Solution gas | ||
− | | * Rapid drop in reservoir pressure early in production history | + | | |
− | + | * Rapid drop in reservoir pressure early in production history | |
+ | * Exponential production decline | ||
+ | * Water-free production (or relatively minor) | ||
+ | * Increasing GOR early, decreasing later as gas is exhausted | ||
+ | * Low recovery factor (20% or less) | ||
|- | |- | ||
| Rock drive | | Rock drive | ||
− | | * Unconsolidated reservoir such as sandstone, chalk, or diatomite | + | | |
− | + | * Unconsolidated reservoir such as sandstone, chalk, or diatomite | |
+ | * Reservoir in overpressure section | ||
+ | * No decline while reservoir compacts, then rapid production decline | ||
|- | |- | ||
− | | Gravity | + | | [[Gravity]] |
− | | * Steeply dipping beds or vertical [[permeability]] greater than horizontal | + | | |
− | + | * Steeply dipping beds or vertical [[permeability]] greater than horizontal | |
+ | * Fractured reservoir | ||
+ | * Low-[[viscosity]] oil (in general) | ||
+ | * Rapid production decline | ||
+ | * High recovery rate (75% or more), but often with low recovery volume | ||
|} | |} | ||
==Production history characteristics for drives== | ==Production history characteristics for drives== | ||
− | |||
− | [[file:predicting-reservoir-system-quality-and-performance_fig9-8.png|thumb|{{figure number| | + | [[file:predicting-reservoir-system-quality-and-performance_fig9-8.png|thumb|300px|{{figure number|1}}Oil reservoir production history characteristics for water, gas expansion, and gas solution drives. Modified. Copyright: Levorsen;<ref name=Levorsen_1954>Levorsen, A. I., 1954, Geology of Petroleum: San Francisco, W. H. Freeman, 703 p.</ref> courtesy W.H. Freeman and Co.]] |
+ | |||
+ | [[:file:predicting-reservoir-system-quality-and-performance_fig9-8.png|Figure 1]] shows oil reservoir production history characteristics for water, gas expansion, and gas solution drives. To predict reservoir drive type, if possible, plot the production history of nearby fields with analogous reservoir systems and compare with these graphs. | ||
==Recoveries of oil vs. gas reservoirs== | ==Recoveries of oil vs. gas reservoirs== | ||
− | The table below shows typical recovery rates for oil vs. gas reservoir systems for different reservoir drive mechanisms with mega and macro port type systems | + | The table below shows typical recovery rates for oil vs. gas reservoir systems for different reservoir drive mechanisms with mega and macro port type systems.<ref>Farina, J. personal communication, 1998</ref><ref name=ch09r21>Garb, F. A., and G. L. Smith, 1987, Estimation of oil and gas reserves, in H. B. Bradley, ed., Petroleum Engineering Handbook: SPE, p. 40-1–40-32.</ref> Recoveries would be lower for meso to micro port systems. Use this table to project the recoveries for your prospects. |
{| class = "wikitable" | {| class = "wikitable" | ||
|- | |- | ||
− | ! Reservoir drive mechanism | + | ! rowspan=2 | Reservoir drive mechanism || colspan=2 | Percent ultimate recovery |
− | + | |- | |
− | ! Gas | + | ! Gas || Oil |
− | |||
|- | |- | ||
− | | Strong water | + | | Strong water || 30–40 || 45–60 |
− | | 30–40 | ||
− | | 45–60 | ||
|- | |- | ||
− | | Partial water | + | | Partial water || 40–50 || 30–45 |
− | | 40–50 | ||
− | | 30–45 | ||
|- | |- | ||
− | | Gas expansion | + | | Gas expansion || 50–70 || 20–30 |
− | | 50–70 | ||
− | | 20–30 | ||
|- | |- | ||
− | | Solution gas | + | | Solution gas || N/A || 15–25 |
− | | N/A | ||
− | | 15–25 | ||
|- | |- | ||
− | | Rock | + | | Rock || 60–80 || 10–60 |
− | | 60–80 | ||
− | | 10–60 | ||
|- | |- | ||
− | | Gravity drainage | + | | [[Gravity]] drainage || N/A || 50–70 |
− | | N/A | ||
− | | 50–70 | ||
|} | |} | ||
==Recoveries for sandstone vs. carbonate reservoirs== | ==Recoveries for sandstone vs. carbonate reservoirs== | ||
− | The American Petroleum Institute conducted a study to determine recovery amounts and efficiencies for water vs. solution gas drives for sandstone and carbonate reservoirs, summarized in the table below | + | The American Petroleum Institute conducted a study to determine recovery amounts and efficiencies for water vs. solution gas drives for sandstone and carbonate reservoirs, summarized in the table below.<ref name=Arps=1964>Arps, J. J., 1964, [http://archives.datapages.com/data/bulletns/1961-64/data/pg/0048/0002/0150/0157.htm Engineering concepts useful in oil finding]: AAPG Bulletin, v. 48, no. 2, p. 943-961.</ref> Use the table to project recoveries for your prospects. |
− | {| class = "wikitable" | + | {| class = "wikitable sortable" |
+ | |- | ||
+ | ! rowspan=2 | Drive | ||
+ | ! rowspan=2 | Units | ||
+ | ! colspan=3 | Sandstone | ||
+ | ! colspan=3 | Carbonate | ||
|- | |- | ||
− | |||
− | |||
− | |||
− | |||
! Min. | ! Min. | ||
! Ave. | ! Ave. | ||
Line 101: | Line 111: | ||
! Max. | ! Max. | ||
|- | |- | ||
− | | Water | + | | rowspan=3 | Water |
| bbl/acre-ft | | bbl/acre-ft | ||
| 155 | | 155 | ||
Line 110: | Line 120: | ||
| 1,422 | | 1,422 | ||
|- | |- | ||
− | | m<sup>3</sup> /h-m | + | | m<sup>3</sup>/h-m |
| 199 | | 199 | ||
| 735 | | 735 | ||
Line 118: | Line 128: | ||
| 1,831 | | 1,831 | ||
|- | |- | ||
− | | % | + | | % STOOIP |
| 28 | | 28 | ||
| 51 | | 51 | ||
Line 126: | Line 136: | ||
| 80 | | 80 | ||
|- | |- | ||
− | | Solution gas | + | | rowspan=3 | Solution gas |
| bbl/acre-ft | | bbl/acre-ft | ||
| 47 | | 47 | ||
Line 135: | Line 145: | ||
| 187 | | 187 | ||
|- | |- | ||
− | | m<sup>3</sup> /h-m | + | | m<sup>3</sup>/h-m |
| 60 | | 60 | ||
| 198 | | 198 | ||
Line 143: | Line 153: | ||
| 241 | | 241 | ||
|- | |- | ||
− | | % | + | | % STOOIP |
| 9 | | 9 | ||
| 21 | | 21 | ||
Line 153: | Line 163: | ||
==See also== | ==See also== | ||
− | * [[Reservoir system | + | * [[Reservoir system]] |
− | |||
* [[Analyzing a reservoir system]] | * [[Analyzing a reservoir system]] | ||
* [[Defining flow units and containers]] | * [[Defining flow units and containers]] | ||
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[[Category:Predicting the occurrence of oil and gas traps]] | [[Category:Predicting the occurrence of oil and gas traps]] | ||
[[Category:Predicting reservoir system quality and performance]] [[Category:Pages with bad references]] | [[Category:Predicting reservoir system quality and performance]] [[Category:Pages with bad references]] | ||
+ | [[Category:Treatise Handbook 3]] |
Latest revision as of 13:51, 4 April 2022
Exploring for Oil and Gas Traps | |
Series | Treatise in Petroleum Geology |
---|---|
Part | Predicting the occurrence of oil and gas traps |
Chapter | Predicting reservoir system quality and performance |
Author | Dan J. Hartmann, Edward A. Beaumont |
Link | Web page |
Store | AAPG Store |
One can predict drive type by analyzing (1) the reservoir system of a prospect and (2) the production history characteristics of similar nearby reservoirs.
Predicting drive type[edit]
Reservoir analysis includes making cross sections, structural maps, and isopach maps. Analyzing nearby producing fields yields the best set of inferential data. This includes (1) making plots of historical oil, gas, condensate, and water production and pressure decline and (2) making cumulative production maps. When all available information has been assembled, find the drive type that best fits the prospective reservoir system. The table below summarizes typical characteristics of primary drive types.
Drive | Characteristics |
---|---|
Water |
|
Gas expansion |
|
Solution gas |
|
Rock drive |
|
Gravity |
|
Production history characteristics for drives[edit]
Figure 1 shows oil reservoir production history characteristics for water, gas expansion, and gas solution drives. To predict reservoir drive type, if possible, plot the production history of nearby fields with analogous reservoir systems and compare with these graphs.
Recoveries of oil vs. gas reservoirs[edit]
The table below shows typical recovery rates for oil vs. gas reservoir systems for different reservoir drive mechanisms with mega and macro port type systems.[2][3] Recoveries would be lower for meso to micro port systems. Use this table to project the recoveries for your prospects.
Reservoir drive mechanism | Percent ultimate recovery | |
---|---|---|
Gas | Oil | |
Strong water | 30–40 | 45–60 |
Partial water | 40–50 | 30–45 |
Gas expansion | 50–70 | 20–30 |
Solution gas | N/A | 15–25 |
Rock | 60–80 | 10–60 |
Gravity drainage | N/A | 50–70 |
Recoveries for sandstone vs. carbonate reservoirs[edit]
The American Petroleum Institute conducted a study to determine recovery amounts and efficiencies for water vs. solution gas drives for sandstone and carbonate reservoirs, summarized in the table below.[4] Use the table to project recoveries for your prospects.
Drive | Units | Sandstone | Carbonate | ||||
---|---|---|---|---|---|---|---|
Min. | Ave. | Max. | Min. | Ave. | Max. | ||
Water | bbl/acre-ft | 155 | 571 | 1,641 | 6 | 172 | 1,422 |
m3/h-m | 199 | 735 | 2,113 | 8 | 221 | 1,831 | |
% STOOIP | 28 | 51 | 87 | 6 | 44 | 80 | |
Solution gas | bbl/acre-ft | 47 | 154 | 534 | 20 | 88 | 187 |
m3/h-m | 60 | 198 | 688 | 26 | 113 | 241 | |
% STOOIP | 9 | 21 | 46 | 15 | 18 | 21 |
See also[edit]
- Reservoir system
- Analyzing a reservoir system
- Defining flow units and containers
- Reservoir drive mechanisms
References[edit]
- ↑ Levorsen, A. I., 1954, Geology of Petroleum: San Francisco, W. H. Freeman, 703 p.
- ↑ Farina, J. personal communication, 1998
- ↑ Garb, F. A., and G. L. Smith, 1987, Estimation of oil and gas reserves, in H. B. Bradley, ed., Petroleum Engineering Handbook: SPE, p. 40-1–40-32.
- ↑ Arps, J. J., 1964, Engineering concepts useful in oil finding: AAPG Bulletin, v. 48, no. 2, p. 943-961.