Patent ID: 9008986
Filing Date: 2015-04-14
Classification: E21B

Abstract:
1. A method to calibrate logging measurements from a logging tool, comprising: providing a logging tool for which one or more attributes vary over the course of logging; obtaining a pre-logging calibration function relating to a configuration of the logging tool before a first logging operation, using a processor; obtaining logging measurements using the logging tool during the first logging operation, wherein the logging measurements relate to a property of materials surrounding the logging tool at a plurality of depths over a period of time of the first logging operation during which the one or more attributes of the logging tool vary; obtaining a post-logging calibration function relating to a change in the configuration of the logging tool that occurred over the course of the first logging operation, using the processor; determining a variable calibration function using the pre-logging calibration function and the post-logging calibration function, using the processor; and calibrating the logging measurements using the variable calibration function, using the processor.