The Magnetic Thickness Tool surveys variations in pipe metal thickness. Twelve sensors are mounted on the inside of a set of bow springs, allowing the tool to pass through tubing and log pipe sizes up to 7in casing.
Description
An alternating magnetic wave is emitted from the tool; this permeates through the casing wall and then travels a short distance along the outside before passing back through the wall and being detected by the sensors. The velocity and amplitude of the emitted wave are affected by the metal thickness; thinner walls resulting in faster wave propagation and less attenuation. These differences are used to detect and quantify variations such as pitting and metal loss. Reference to the Multifinger Imaging Tool data determines whether the metal loss found with the MTT is internal or external.
By combining information from the MIT and MTT in WIVA software, images can be created on a computer screen in 3 dimensions. Colour schemes, meshes, arrows and numerical data can be added to help an engineer understand the structure and condition of their well. Data from the MIT and MTT can be automatically processed with WIPER software to identify certain features in the well; most obviously the collars. After setting certain parameters, the software carries out a joint by joint statistical analysis and builds a report summarising the condition of pipe in the well.
Features
- Pipe inspection for internal & external metal loss.
- Surveys wall thickness.
- Optimised results using MIT data for internal diameter.
- Logs casing below tubing due to bow spring design.
- Simultaneous operation with other Sondex UltrawireTM tools.
- Surface read out or memory logging.
- Visualisation using WIVA 3D imaging software.
- Processing, Evaluation and Reporting with WIPER software.
