Reprint of part of announcement on 15th April with original plans and estimates for Ash Creek. It will be interesting to see if they remain consistent.
The field was completely plugged and abandoned in 1998. Peak oil production was almost 2000 barrels per day (BOPD) and cumulative production from the entire field has been just over 6 million barrels of oil from a maximum number of 25 production wells
FIELD REDEVELOPMENT
Four distinct redevelopment scenarios exist at Ash Creek. 1. Redeveloping the Upper Shannon reservoir. . The Upper Shannon has been water-flooded but
final oil rates in the field were around 30 BOPD in 1998. However the plugging of wells started back in the early 1990?s when the field was still producing around 60 BOPD. At this time the field was only producing from the Upper Shannon reservoir. The Original Oil in Place (OOIP) for the Upper Shannon is 9.7 million barrels. Estimated recovery from the Upper Shannon for Wyoming only is 4.4 million barrels. There may be as much as 450,000 barrels remaining reserves in the Upper Shannon recoverable by conventional primary and secondary means.
2. Redeveloping the Lower Shannon. The Lower Shannon was only produced in the 1950?s and early 1960?s, but was never water flooded. The OOIP in the Lower Shannon is 8.9 million barrels with only 1.3 million barrels recovered from Wyoming only. An estimated 1.8 million barrels is the target in the Lower Shannon recoverable by conventional primary and secondary means.
3. Infill drilling and attic oil. Infill drilling in the 1980?s showed that there was oil left behind between wells. The absolute crest of both fault blocks has not been drilled and potential exists for banked oil high on structure in the field. This would be part of the 2.25 million barrels estimated above to be recoverable by conventional primary and secondary production technology.
4. Tertiary oil recovery using chemical flood methods. The shallow, high permeability sandstones at Ash Creek make it very conducive to chemical flooding. If 14% of the Original Oil in Place is recoverable with chemical methods (an assumption made by using the average of the Grieve#39A radial core-floods), then an additional 2.6 million barrels could be targeted. This would be additional to the 2.25 million barrels detailed above.
Reprint of part of announcement on 15th April with original...
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