Logging-While-Tripping Provides High-Quality Data To Assess Frac Effectiveness By Jessica Barhaug and Darby Witt DENVER-Production tends to be highly variable along the horizontal lateral in unconventional wells with plug-and-perf completions. This variability can be related to a number of factors, including completion parameters-such as fluid entry, proppant volume, injection rate and perforation cluster spacing-as well as geological conditions that influence the performance of individual stimulated perforation clusters and stages. The ability to accurately evaluate fracture efficiency is critical to optimizing the productivity of each cluster in plug-and-perf completions. Logging-while-tripping (LWT) is a unique method in which tools record openhole formation data from inside pipe. Acquiring LWT data during lateral drilling and again during plug mill out provides essential information to diagnose stimulation distribution effectiveness (SDE) and perforation cluster efficiency (PCE). Both SDE and PCE are important to achieving treatment consistency along the length of a lateral while also avoiding " runaway " fracs, and premature fracture interactions with nearby wellbores. APRIL 2022 49