Making Full Use of Horizontal Well Data in Depth Conversion - A Case Study at the Dan Field

In this abstract we give a case study of a depth conversion that takes full advantage of horizontal well data and the uncertainty on the well track. By allowing wells path to be simultaneously optimized with other uncertain data we can identify mispositioned wells, by examining the amount that a well path needs been moved to make them consistent with the surrounding data. This knowledge can be used by the geologist to quickly screen for the most problematic wells. Ultimately this provides depth surfaces that are consistent with the all well data, especially zone information along long horizontal wells, which serves as a good starting position for subsequent geomodelling tasks.4