Assessement of improved oil recovery potential of Dai Hung oil field
Abstract
Since the 1990s, over 30 wells have been drilled in Dai Hung field (Block 05-1a, Nam Con Son basin), resulting in oil discoveries and oil production from clastic and carbonate reservoirs. Most of the clastic reservoirs are producing with natural depletion mechanism, except for the reservoir of Block L, where water injection has been applied. Although the reservoir characteristics of Dai Hung field are quite good with average porosity and permeability of around 25% and 50mD respectively, the average recovery factor of the field is quite low, only 13%.
Production performance of Dai Hung field shows the difference from block to block due to the complex reservoir characteristics. The water injection and acidising solutions have proven to be effective for Dai Hung field, therefore there would be a high chance of success in increasing reserves if EOR/IOR methods are applied.
The results of the assessment of compatibility with the reservoir specification showed that feasible solutions available for Block L include unmixed gas injection, hydrocarbon gas injection, carbon dioxide injection, and alkaline/surfactant/ polymer flooding.
This paper presents the studies evaluating applicable IOR solutions for the whole Dai Hung field. The study results show that the reservoir heterogeneity can be used to predict the potential and also the effect of IOR processes.
References
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