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Low permeability sandstone waterflood: Difference between revisions
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This page provides a [[reservoir management]] case study for a low-permeability sandstone field in which [[waterflooding]] techniques have been implemented. | This page provides a [[Reservoir_management|reservoir management]] case study for a low-permeability sandstone field in which [[Waterflooding|waterflooding]] techniques have been implemented. | ||
== Background and geological information == | |||
The reservoir is a series of Cretaceous-age, prograding delta clastic sediments consisting of laminated fine-grained sands and shales that are trapped stratigraphically by overlying shales. Reservoir averages are approximately: | The reservoir is a series of Cretaceous-age, prograding delta clastic sediments consisting of laminated fine-grained sands and shales that are trapped stratigraphically by overlying shales. Reservoir averages are approximately: | ||
*50 ft of gross pay | *50 ft of gross pay | ||
*15% porosity | *15% porosity | ||
*20 md permeability | *20 md permeability | ||
==Program used== | == Program used == | ||
The primary recovery mechanism was [[Solution_gas_drive_reservoirs|solution-gas drive]]. The field was converted to [[Waterflooding|waterflood]] in 1961 with an inverted [[Waterflood_design|nine-spot injection pattern]]. Subsequently, a portion of the field was converted to line-drive water injection for improved sweep efficiency and increased water injection capacity. | |||
==Field surveillance and management== | == Recovery performance == | ||
Exploitation of the reservoir is focused currently on reperforating underperforming wells and infill drilling into portions of the reservoir that are shown to be poorly swept. Continuous rebalancing of water injection is proving effective in displacing oil from uncontacted layers. | |||
Under primary recovery, the field produced 5% of original oil in place (OOIP). Incremental recovery to date under waterflood has been an additional 17% of OOIP. An ultimate recovery efficiency of 26% of OOIP is forecast. | |||
== Field surveillance and management == | |||
Exploitation of the reservoir is focused currently on reperforating underperforming wells and infill drilling into portions of the reservoir that are shown to be poorly swept. Continuous rebalancing of water injection is proving effective in displacing oil from uncontacted layers. | |||
== Noteworthy papers in OnePetro == | |||
Use this section to list papers in OnePetro that a reader who wants to learn more should definitely read | Use this section to list papers in OnePetro that a reader who wants to learn more should definitely read | ||
==External links== | == External links == | ||
Use this section to provide links to relevant material on websites other than PetroWiki and OnePetro | Use this section to provide links to relevant material on websites other than PetroWiki and OnePetro | ||
==See also== | == See also == | ||
[[Reservoir management]] | |||
[[Reservoir_management|Reservoir management]] | |||
[[Waterflooding|Waterflooding]] | |||
[[ | [[PEH:Reservoir_Management_Programs]] | ||
[[ | [[Category:5.4.1 Waterflooding]] | ||
Latest revision as of 11:26, 8 June 2015
This page provides a reservoir management case study for a low-permeability sandstone field in which waterflooding techniques have been implemented.
Background and geological information
The reservoir is a series of Cretaceous-age, prograding delta clastic sediments consisting of laminated fine-grained sands and shales that are trapped stratigraphically by overlying shales. Reservoir averages are approximately:
- 50 ft of gross pay
- 15% porosity
- 20 md permeability
Program used
The primary recovery mechanism was solution-gas drive. The field was converted to waterflood in 1961 with an inverted nine-spot injection pattern. Subsequently, a portion of the field was converted to line-drive water injection for improved sweep efficiency and increased water injection capacity.
Recovery performance
Under primary recovery, the field produced 5% of original oil in place (OOIP). Incremental recovery to date under waterflood has been an additional 17% of OOIP. An ultimate recovery efficiency of 26% of OOIP is forecast.
Field surveillance and management
Exploitation of the reservoir is focused currently on reperforating underperforming wells and infill drilling into portions of the reservoir that are shown to be poorly swept. Continuous rebalancing of water injection is proving effective in displacing oil from uncontacted layers.
Noteworthy papers in OnePetro
Use this section to list papers in OnePetro that a reader who wants to learn more should definitely read
External links
Use this section to provide links to relevant material on websites other than PetroWiki and OnePetro