4 – Tubing Deformation

Tubing Deformation

New generation of casing and tubing deformation inspection

Casing and tubing deformation inspection presented in field as it looks downhole

The Cereus Nusonix Ultrasonic tool was run in tandem with a 40-finger calliper (MFC) on slickline. The primary objective of the logging operation was to determine the extent of the casing deformation previously identified.

The log was repeatedly run at logging speeds of 2m/min, 5m/min, and 9m/min over the section of interest. The Ultrasonic tool failed to directly identify the position of the casing through the production tubing. This is attributed to the very high viscosity and wax content of the oil in which the tool was being logged, causing significant absorption of the received acoustic signal energy. Although this signal was visible in some areas, the weak signal quality prevented accurate interpretation of the casing position. In future operations, the well bore fluid should be displaced to water.

The Ultrasonic tool recorded high resolution internal radius and wall thickness measurements. Over the section of interest, the repeat logs recorded were highly repeatable, identifying a directional shift of the tubing at the same location as the casing deformation.

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