Real-Time Measurement of Cement Bond Quality and Integrity
Cement placement is a critical component of well architecture for ensuring casing mechanical support, protection from fluid corrosion, and most importantly isolating permeable zones at different pressure regimes to prevent hydraulic communication.
Cement evaluation tools measure the bond between the casing and the cement placed in the wellbore annulus between casing and wellbore. This-real-time measurement is made with acoustic sonic or ultrasonic tools. Hydraulic isolation between reservoir layers is essential to avoid potential reservoir problems such as crossflow between reservoir zones behind the casing. The detection of poor cement, or the absence of cement, can lead to remedial action before the well is completed, avoiding potential well problems and the associated costs.
The new ultrasonic Isolation Scanner imaging tool combines the classic pulse-echo technique with a pitch-catch technique that provides echoes arising from a flexural wave propagation along the casing as well as from reflections at the cement-formation interface. In real time the tool discriminates between lightweight cements and mud, both of which have low acoustic impedance and hence present a challenge to the pulse-echo technique. The Isolation Scanner tool also provides radial imaging of the cement sheath to estimate casing eccentering within the hole, channel detection in the cement sheath, and hole shape.
Confidently evaluate zonal isolation even in the presence of lightweight cement by using a new ultrasonic technique that also pinpoints cement channels and provides real-time information about casing eccentralization, ID, and thickness.
Accurate, high-resolution, 3600 coverage in real time of pipe-to-cement bond quality and downhole pipe condition helps improve cementing.
Precise axial measurements provide data about cement-to-casing and cement-to-formation bonds.
Cement bond and variable density logs indicate cement quality and integrity around casing.
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