Real-time Flowline Compressibility Changes as a Catalyst for Advanced Petrophysical Interpretation in Thin-Bedded Pay

This paper introduces a novel approach for saturation type identification through real-time monitoring of flowline compressibility changes during pretest operations. This method enhances petrophysical interpretation by identifying fluid types, particularly gas, in interbedded sandstone and shale formations. Traditional petrophysical methods often misidentify gas as oil due to shoulder bed effects, leading to incorrect reservoir management decisions. By observing compressibility changes during decompression and recompression phases, this technique flags gas ingress into the flowline, indicating the presence of mobile gas. High-resolution density measurements and advanced evaluation techniques further refine the petrophysical interpretation, resulting in more accurate identification of pay zones and improved well completion decisions.