Mature fields of the Middle East have some of the longest production histories and richest data sets of any oilfields in the world. Waterfloods in fields that have operated for many years are reaching a stage in which better understanding of the reservoir’s response to water injection is critical for optimal field management going forward. A common approach, however, is that existing data sets are often used only by individual technical disciplines for relatively narrow purposes, such as well performance diagnoses.
An integrated, multidisciplinary study of a carbonate reservoir in the Minagish Field was implemented to better evaluate the conformance and integrity of current water injection operations, and make recommendations for improvement. A secondary objective was to establish a solid interdisciplinary workflow to support periodic reevaluation and update of the study.
A joint team of reservoir engineers and geoscientists was formed from KOC’s West Kuwait Asset Team and Halliburton’s Landmark group. Using a Common Visualization Environment (CVE) (Figure 1), the team integrated the Minagish Field history with all available static and dynamic data into a single, consistent data set.
A detailed geologic model with compartmentalization and layering schemes was established which was most likely to control fluid movements within the reservoir. This was validated and a more consistent model was developed by incorporating dynamic field data. The revised model based on flow units was further validated by cross-sectional reservoir simulation models in selected areas of the field.
This study suggests KOC can produce the Minagish Field at significantly higher offtakes in the future without negatively impacting recovery.