AST-04 well is a production well located in Riau, this well currently has two production Layers (SD_04 has oil reserve and SD_05 has gas reserve). Using commingle completion the oil production in this well is below expectation. This problem caused by SD_05 gas production with high pressure which through SD_04 perforation hamper the oil flow. Re-completion design using multiple completion become a solution to improve oil production. Oil from SD_04 will be flowed using short string, while gas from SD_05 using long string. By Vogel Equation, the redesign results production increase to 290 BOPD with natural flow using tubing size 2 7/8 inch. To utilize SD_05 gas production and increase SD_04 oil production, natural gas lift selected to assist oil lifting. Gas produces from SD_05 will be injected to short string (SD_04 perforation area) through an orifice. This method expected can increase oil production SD_04 layer to 406 BOPD with injection rate 1.367 MMSCFD. Using Craft, Holdden, & Graves equation, the orifice size 16/64 needed to flow the gas with injection rate desired.
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