Measuring invisible lost time in drilling operations

摘要

A method may comprise drilling a wellbore penetrating a subterranean formation; collecting drill time data for the drilling; converting the drill time data into segmented drill time data; decomposing the segmented drill time data into intrinsic mode functions (IMFs) using an empirical mode decomposition; reconstructing the segmented drill time data by combining the IMFs with different weights, thereby producing modified segmented drill time data; and calculating an invisible lost time for the drilling based on the segmented drill time data and the modified segmented drill time data.