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Low permeability sandstone waterflood
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
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.
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.
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