Study to use gas lift to create foam-acid system to handle near-bottom zone in Bach Ho field
Abstract
The calculation and selection of appropriate treatment methods for the near-bottom zone will save costs and improve oil recovery capacity for the production wells. Wells with high temperatures and high levels of flooding when treated with acid may face increased flooding or even submerged conditions, therefore selective acid treatment technology must be applied. For Bach Ho basement with high reservoir temperature (110 - 150oC) and low reservoir pressure, the most effective method is foam-acid treatment by mixing gas lift.
The article presents the results of research on using high-pressure gas lift available on rigs, mixing and pumping simultaneously with the acid mixture into the well to treat the near-bottom zone. The results show that this solution is easy to apply, helps to reduce costs, and improves the efficiency of the treatment of the near-bottom zone of wells with low reservoir pressure, high reservoir temperature, and flooding level from 10 - 30%.
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