Device and method of determining rate of penetration and rate of rotation

摘要

Methods and devices for determining a rate of penetration and/or rate of rotation for a drilling assembly or logging tool while drilling or logging a wellbore are provided. The methods can include the steps of: at respective first and second time instant, acquiring and storing a first logging data frame using a first array of sensors and a second logging data frame using a second array of sensors where wherein the logging data relate to at least one property of a zone surrounding the wellbore and the second logging data frame overlaps at least partially the first logging data frame; comparing the first and second logging data frames; determining a relative change in depth and/or azimuth between the first and second logging data frames; and calculating the rate of penetration and/or rate of rotation based on the relative change in depth and/or azimuth determined and a difference between the first and second time instants.