In addition to pulse-echo corrosion information on the rugosity, radius, cross section, and thickness of the 7-in casing, Isolation Scanner service combines acoustic impedance and flexural attenuation information in an SLG map.
Isolation Scanner cement evaluation service combines classic pulse-echo technology with a new ultrasonic technique—flexural wave imaging—to accurately evaluate any type of cement, from traditional slurries and heavy cements to the latest lightweight and foam cements. This innovative method provides real-time evaluation of cement jobs in a wider range of conditions than previously possible with conventional technologies.
The tool's combination of independent measurements differentiates low-density solids from liquids to distinguish lightweight, foam, and contaminated cements from liquids. Its azimuthal coverage provides an answer around the entire circumference of the casing, pinpointing any channels in the cement and confirming the effectiveness of a cement job for zonal isolation. Isolation Scanner service also identifies corrosion or drilling-induced wear through measurement of the inside diameter and thickness of the casing.
Flexural wave imaging
The addition of the flexural measurement produces an entirely new piece of information yielding potential insight for certain applications. With analysis in addition to the cement evaluation, flexural reflections from the third interface may also define the position of the casing within the borehole or outer casing. Previously unavailable cased hole–environment geometrical information can help assess casing and cementing techniques, choose cut points on casing retrieval jobs, and provide context for other evaluation services run through casing.
