Mwd Ultrasonic Caliper Advanced Detection Techniques

摘要

Several Measurement-While-Drilling (MWD) caliper tools, which utilize acoustic technology, are available to the industry (Make 93, Orban 91), but they typically have a limited operating range and are based on analog detection techniques. Technical issues which could preclude the use of acoustics for an MWD caliper tool include the noise associated with the downhole drilling environment, tool accuracy, tool reliability, errors associated with mud attenuaton and signal detection, tool eccentering, formation cuttings, gas, etc.