Sensitivity of Early Kick Detection Parameters in Full-Scale Gas Kick Experiments With Oil- and Water-Based Drilling Muds

ABSTRACT Gas kicks in oil- and water-based mud have been studied in an inclined research well. One of the main objectives has been the study of early kick detection. Data on pit gain, stand pipe pressure and mud return flow have been systemized in all the kicks in order to evaluate the performance and sensitivity of these parameters. The sensitivity of the detection parameters have also been compared for various kick types. The results show that several surface detection parameters are necessary in order to optimize detection. The reduction in pit gain due to gas solubility in OBM is shown to be significant The mud return flow was the most sensitive parameter in OBM. In WBM also pit gain and stand pipe pressure were valuable for kick detection. New detection signs have been found on the return flow signal in OBM and in kicks with MWD pressure pulsing.