The Role of Sequential Well Testing in Improving Oil Recovery From a Closed Sand Lens in the Bahrain Field

Abstract

Summary The Ac zone refers to the sandstone facies of the Wara formation, which belongs to the Wasia group of the Middle Cretaceous age.* Owing to variable shale to sand ratios, the Ac zone is realized as different isolated sand lenses scattered all over the field. Owing to the complexity of the geology and the flow mechanism, well testing was used to manage the reservoir. The concept of a sequence of well tests on the same well was found to be essential in improving the oil recovery. Conducted on a specific well situated within a closed sand lens, sequential well testing yielded valuable information that assisted in understanding the drive mechanism and the deteriorating reservoir parameters, permeability, and skin. Such a method was crucial in improving the recovery from the sand lens as well as from the single-well-treatment perspective. This paper presents an example of how such a technique aided in improving the oil recovery from a small sand lens.