Magnetic Thickness Detector (MTD)

The Magnetic Thickness Detector (MTD) is a 1-11/16 in O.D electromagnetic corrosion measuring instrument primarily run through tubing with the unique ability to simultaneously inspect tubing and the casings behind it. The integrity of the casing string can be evaluated with neither the requirement for costly workover rig, nor the time-consuming removal of the tubing completion.

GOWell’s latest generation MTD tool is capable of evaluating quantitative thickness measurements up to three concentric pipes. The state-of-the-art instrument combines a high power transmitter, improved signal-to-noise  (SNR) electronics and fully configurable acquisition. This flexible approach allows a wide range of evaluations under different conditions and conveyance systems.

A simple engineer selection of the functional mode allows features such as:

• Logging in large pipes (up to 18-5/8 inches)

• Fast logging of single pipes

• Chrome/alloy pipe evaluation

• Thick casings

• Memory-optimized logging


Internally the tool acquires up to 300 channels of pulsed eddy current transient decay, that can be transmitted real-time to surface or stored downhole. Real-time logging is possible either in combination below any of GOWell’s existing Multi-Finger caliper (MFC) tools or when combined with PegasusStar– GOWell’s state-of-the-art high-speed telemetry system. Memory acquisition is supported via GOWell’s memory logging system. 

When run with our PegasusStar platform, the MTD is fully combinable with Multi-Finger calipers (MFC), Gamma-Ray/Temperature/CCL (GTC) and our Digital Radial Bond Tool (RBL). The combination provides a comprehensive evaluation of the well integrity, providing accurate thickness information for multiple pipe strings as well as the cement bond quality. 



  • Slim tool with 1-11/16 in O.D
  • Pegasus modular, combinable tool for both SRO and memory
  • Quantitative 3 pipe thickness evaluation
  • Pre-job planner software that combines a powerful forward modeling module and simulation tool that is used to predict job specific tool responses to allow effective job planning 
  • Fully configurable tool caters to a wide range of downhole conditions. Customizable operating modes allow for maximum job flexibility in both SRO and memory modes 
  • Full physics inversion processing in an easy to use, user friendly module of MIPSPro Well Integrity Platform
  • 3-axis accelerometer allows monitoring of tool motion,relative bearing and well inclination
  • Warrior Compatible