Isolation Scanner | SLB

Isolation Scanner

Cement evaluation service

Isolation Scanner.

Full characterization of the downhole environment and casing condition

Isolation Scanner™ cement evaluation service integrates the conventional ultrasonic pulse-echo technique with flexural wave propagation to fully characterize the cased hole annular environment while evaluating casing conditions—even where the cement has a low acoustic impedance or mud contamination.

Conventional cement bond log (CBL) and ultrasonic pulse-echo techniques require a significant contrast in acoustic impedance between the cement and the displaced fluid to unambiguously identify solids.

  • Differentiate high-performance lightweight cements from liquids
  • Map annulus material as solid, liquid, or gas
  • Access hydraulic isolation
  • Identify channels and defects in annular isolating material
  • Access annulus beyond the casing and cement interface
  • Identify corrosion or drilling-induced wear
  • Determine inside diameter and thickness of the casing
  • H2S sour service

Rotating sub assembly containing four transducers: a transreceiver, and a flexural wave imager with one transmitter and two receivers.

Isolation Scanner service flexural wave technique uses a transmitter to induce a flexural wave in the casing and measures the resulting signals at two receivers. The attenuation calculated between the two receivers provides an independent response that is paired with the pulse-echo measurement and compared with a laboratory-measured database to produce an image of the material immediately behind the casing. By radially measuring beyond the boundaries of traditional cement evaluation, Isolation Scanner service confirms zonal isolation, pinpoints any channels in the cement, and ensures confident squeeze or no-squeeze decisions.

Isolation Scanner cement evaluation service.
The Isolation Scanner service uses the pulse-echo technique with four transducers. A transreceiver and the flexural wave imager with one transmitter and two receivers are obliquely aligned to excite the casing flexural mode.