Publications

Dump-flooding is a process of water flowing from higher-pressure-aquifer/ -water-bearing-reservoir to lower and depleted-pressure-oil reservoir through casing of the same well. This method is introduced to resolve groundwater scarcity of remote field problem. Furthermore, dump flood is a more cost-friendly method compare with conventional water injection, as it does not require water surface facility, more injection wells, and injection pipelines. Although dump-flooding has been successfully applied in many oilfields in the world, yet there is no standardized screening criteria that have been published. Therefore, this paper intends to generate a dump flood-organized-screening table to acquire potential oil reservoir candidates in Indonesia through dumpflooding projects based on the screening results. The screening table was constructed by gathering reservoir, aquifer, and fluid property data from positively-applied-dump flood project-oilfield. Two sensitivity methods – radar plot and CORRELL – were used to define critical and non-critical parameters which affected the oil recovery factor value. After being analyzed, the sensitivity results from CORRELL method were selected considering it is used frequently to measure the strength of the relationship between two variables. There are seven critical parameters (oil viscosity, reservoir permeability and porosity, depth, reservoir temperature, and aquifer porosity and permeability) that influence the decision to perform dump-flooding in one field. There are 134 out of 264 oilfields in Indonesia were tested with confident of 90% that were screened afterward. In addition, there are two factors to determine “go/no-go” decision, those are: range of tolerance and uncertainty. The status of the project can be declared as “go” if there is no out-of-tolerance-range-parameter and the uncertainty accumulation parameters is below 30%. After screening, 75 out of 134 fields were passed, where the majority of them were sandstone reservoirs with a dominant light oil compositions and been previously water flooded