ANALYSIS OF SUCCESS PERCENTAGE TO DETERMINE PATTERN LOCATION CONVERTING INVERTED SEVEN SPOT PATTERN TO INVERTED THIRTEEN SPOT PATTERN CASE STUDY X FIELD

• Main Author: LUKITO (NIM: 22207313), CHRISTIEN
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/21510
• Institution: Institut Teknologi Bandung

Pattern waterflood in X field was initiated in 1993, using inverted seven spot pattern – 72 acres where one injection well is located in the central, surrounded by <br /> <br /> <br /> six producer wells in a hexagonal pattern shape. In fact, it is believed there is an area within pattern that is not swept by existing wells, so that areal sweep <br /> <br /> <br /> efficiency is not as high as expected. One strategy that is applied to improve areal sweep efficiency is to drill one new producer between existing producers, so the inverted seven spot patterns are converted to inverted thirteen spot patterns. Because of capacity facility limitation in handling water production, a strategy is needed to select pattern locations that can improve areal sweep efficiency and not exceeding existing facilities. <br /> <br /> <br /> Production data mapping can be used to locate new infill drilling with the expected criteria above. In this study, production data mapping was done using commercial software. Reviewing the previous infill well, we can observe what productions attribute can be used to locate next pattern location. <br /> <br /> <br /> Evaluating wells that were drilled in July 2005 - December 2007, monthly average oil production result the biggest success rate, 80 % - 87 %. While ratio water production and oil production result 73 % - 81 % success rate, oil cut resulted 70 % - 80 % success rate, and POa (Produced Oil Attribute) result 77 % - 82 % success rate. Observing the data, success rate will increase when longer data period used. Monthly average oil production also has a wide good area, so that can provide a number of patterns that fit with yearly development drillung in X field.