THE ESSENTIAL ROLE OF THE ADVANCED SURFACE FLUID LOGGING IN THE RESERVOIR FLUID EVALUATION WORKFLOW

摘要

This work presents case studies in which the integration of Advanced Surface Fluid Logging (ASFL), wireline downhole formation fluid and reservoir fluid samples’ PVT analysis proved to be successful in reducing formation evaluation uncertainties and driven the subsequent decisions about the completion and production plan.ASFL analysis was effectively used during the drilling of exploration wells, to provide early formation fluid evaluation, which was then utilized to optimize wireline formation fluid sampling and Drillstem Test (DST) perforation intervals. Identification from ASFL analysis of multiple fluid contacts revealed a much greater complexity of the targeted reservoirs, which in turn was not evident from the standard LWD formation evaluation techniques. The fluid type and fluid contacts calls from ASFL were then confirmed by the wireline downhole fluid analysis, DST and later on by the PVT results. Fluid composition was found constantly in agreement among the different techniques and the ASFL fluid fingerprints were eventually utilized as reference in the field for real time fluid type assessment.