Successful Hydraulic Fracturing Breakthrough in New Low Quality Reservoir Target from Paku Field, Rokan Block, Central Sumatra Basin

Abstract

Abstract Paku Field is a relatively small oil field that is located in Rokan block, Central Sumatra Basin. Paku field had a long production history since 1988 with current recovery factor 24%. The field is still under primary depletion with ESP as its major artificial. Currently, Paku field has two active producers with total oil production of around 100 BOPD. Paku field mostly conducted regular well intervention & well service (add perforation and pump recondition) to maintain/improve production, while special well stimulation like hydraulic fracturing was last conducted in 2016 on Paku #04. Paku #04 fracturing job targeting MGL1 sd with reservoir properties average resistivity 20 ohmm, average porosity 13%, average permeability 44 mD and reservoir pressure 1600 psi. Hydraulic fracturing stimulation in this reservoir successfully conducted resulted in 311 BOPD oil gain and 24% water cut from commingle several reservoirs. Until now Paku #04 is still a good oil producer from the same reservoirs with oil average 60 BOPD and water cut 77%. Looking at the historical success story of Paku #04 as an analog, Paku #05 also has similar low-quality reservoir sand but from the different geological formations that is BK1 sd. The BK1 sd has reservoir properties of 32 ft net pay, 18 Ohmm resistivity, 11% average porosity, 25 mD average permeability and 1534 psi reservoir pressure. The fracturing job in Paku #05 was successfully executed in October 2022 targeting BK1 sd. The job was conducted with several improvements from the previous job of Paku #04 such as conducted with three times more proppant volume (63 k vs 21 k previously), full sand body perforation, and produced from single zone. Hydraulic fracturing stimulation in Paku #5 resulted in initial production of 242 BOPD and water cut 60%. Hydraulic fracturing jobs have been proven as one of the solutions to significantly improved production in primary fields such as Paku Field. Especially to improve production from reservoirs that are identified to have oil in low-quality reservoirs in other well or in another reservoir in Paku Field and from other fields that has the same reservoir properties characteristic.