Pattern X is one of the patterns in Field Z which is 60 km west of Prabumulih, South Sumatra, where the full-scale waterflood is implemented. In general, the pattern used is an irregular inverted 5-spot where there are six production wells namely Z-091, Z-098, Z-110, Z-157, Z-195, and Z-233 and one injection well namely Z-227. Waterflood is a secondary recovery method by injecting water into the reservoir. Waterflood surveillance analysis was carried out to determine the conditions around the production and injection wells during waterflood. Surveillance analysis is used as a measure of success in waterflood activities. One of the methods that used is the Hall Plot method. It is obtained a slope which moves upward where displacement is moved normally or stable. However, over time there is an increase in the slope of the tilt where skin changes occur. In fact, the slope that occurs due to the installation of Multilayer Packer is used to adjust the desired injection rate. In the end, the injection results have no problems and run stable.
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