SPE Annual Technical Conference and Exhibition · 1984 · 12 citations · 2 references
EngineeringCement ManufactureBlastingMechanical EngineeringMineral ProcessingStructural EngineeringCet ToolCorrosion InhibitionCorrosionInstrumentationCorrosion ResistanceNondestructive TestingConcrete TechnologyReinforced ConcreteStructural Health MonitoringUltrasoundCivil Engineering MaterialsCement-based Construction MaterialDrill PipeCivil EngineeringConstruction EngineeringCement Evaluation ToolSingle Tool
SUMMARY The CET (*) tool was initially designed as a Cement Evaluation Tool, based on the ultrasonic resonance of the casing. This resonance, induced and sensed in a pulse-echo mode, depends on the thickness of the casing, on the medium behind the casing, and is also sensitive to casing wear and corrosion. In addition to the exploitation of the amplitude of the echoes and of its eight high resolution (0.1 mm) calipers, the tool was modified to give eight local steel thickness measurements, 45 degrees apart. Thickness is obtained with a resolution of 0.1 mm (0.004 in.) through the determination of the resonant frequencies of the pipe wall. The technique has been widely field-tested, in Europe and in North America, and log examples show the ability of this new tool to detect changes of casing weight, distortion, perforation damage, scaling, wear from the drill pipe, corroded zones, acid attack… This new tool performs the same cement measurements as the CET tool, and has the same size. By providing cement and corrosion evaluation in a single run, it is a unique means of casing investigation.
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