This work conducts a measurement and analysis project on of 4.5” casing corrosion features. Casing samples removed from natural gas storage wells were provided for corrosion feature characterization and comparison in this project. These casing samples have been previously logged by Baker Hughes using their 4995 High Resolution Vertilog (HRVRT) Magnetic Flux Leakage (MFL) tool in 2013. The log results were also provided to C‑FER, which formed the basis for comparing to laboratory-measured corrosion features to assess the HRVRT performance.
Two measurement methods, the Internal...
Two measurement methods, the Internal Rotary Inspection System (IRIS) and Ultrasonic Testing (UT), were tried to characterize the casing corrosion features. The IRIS was unsuccessful, and the UT results were used in the subsequent feature comparison analysis with the MFL logs. However, due to the poor quality of the UT measurements, there was little confidence in the accuracy of the assessment of the MFL tool measurement error. A decision was therefore made by PRCI to halt this project. This report summarizes the work performed and the results.