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KA oil field is located in Sumatera Basin. It has been produced oil since 1937 until now. Because of its long production time, KA field can be called by Mature field. From the beginning production period (1937-1995), the KA field produced about 19.97MMSTB with the recovery is about 35%. Oil production was continued by applying water injection in 1995 until now. Based on PBLB Field case (Yosaphat et al, 2017), almost oil resources which was estimated by volumetric method can be produced throughout the drainage of production well covers whole reservoir. KA field has a long production time which is proportionate to total drainage. The MBE method will be applied in this mature field case study to estimate the OOIP. This field case study is expected to prove that OOIP estimation by MBE method will approach the value of OOIP estimation by volumetric with longer production time. This study aim is analyzing the relationship between MBE-s straight line Havlena-Odeh method to total drainage area and production time in OOIP estimation. With the longer production time, The OOIP value from MBE method is estimated will approach the OOIP value by volumetric method.