--> An Art of Bringing Water from Menggala into Bekasap Fm: Managing bypassed Hydrocarbon through Natural Dump-Flood in Brown Field Area

AAPG Asia Pacific Technical Symposium

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An Art of Bringing Water from Menggala into Bekasap Fm: Managing bypassed Hydrocarbon through Natural Dump-Flood in Brown Field Area

Abstract

Bohemian-14 well was drilled 37 years ago in Nov-1981 as oil producer well, successfully putted on production in Jun-1982 with initial production 359 BOPD and 12% water-cut. Through its lifetime, the well only contributed 3% to the total field cumulative production and reached its limit by the end of 2016 with 99% water-cut, the well then shut-in due to un-economic rate. During its lifetime of production, some flow units have been suffered for almost 20% depletion from its original pressure. As a part of Central Sumatra Basin active production Field, Bohemian has quite thick sediments beneath. Menggala Sand was characterized by blocky vertical amalgamated sand deposited as early post-rift sedimentation during the higher energy of fluvio-environment resulting high quality rock with Permeability ranged from 200-600 mD. By the current condition of strong pressure support with 1,300 psi, this Menggala is an ideal potential as an aquifer to be injected naturally to shallower Bekasap Reservoir. In another hand, Bekasap was the product of transitional estuarine system which resulting relatively shally, fining upward sand with vary lateral distribution of bar & sheet sands currently acted as oil bearing target in this field. After months of study, project team was able to execute the Bohemian-14 as dump-flood well. Using pressure contrast between the deeper prolific Menggala aquifer and shallower Bekasap reservoir, project team was able to trigger natural cross-flow to let the water being ‘naturally’ injected to reservoir. Being in-active and un-economic oil well in previous time, this well now successfully converted into multi-purposes well with two major roles: actively producing gas with up to 300 BOEPD initial production and in-situ water injector to increase the un-swept oil recovery with up to 160 BOPD improvement of crestal well only by three months after execution. As this initiative is known to be first ever applied in small field area, Central Sumatra Basin, it is opening the broad opportunities for in-active well to be life again, producing, and even acted as supporting role for adjacent wells to expand the field lifetime.