Epilogue - Dual-string barrier evaluation

The well decommissioning phase can be complex and costly because of the unknown status of the barrier (often cement) in the B-annulus that may have changed during the life of the well.

Part of Epilogue* efficient P&A services, Epilogue dual-string barrier evaluation enables you to avoid costly and unnecessary steps in the well decommissioning phase. It uses the most advanced method for imaging the B-annulus—all without inner-pipe (tubing or casing) removal, significantly reducing the time required for operations.

Epilogue dual-string barrier evaluation leverages a combination of deep-array multimode sonic measurement (0.5–20 kHz) and multimodality ultrasonic measurement (100–500 kHz). These advanced measurements produce phase and amplitude attributes that yield a combined image of the A- and B- annuli conditions. Ultrasonic measurements provide crucial pipe-to-pipe standoff information and enable you to charaterize liquid conditions in the A-annulus, as well as corrosionrelated gross deformations of the tubing or outer casing. The low-frequency, deeparray sonic measurement provides the B-annulus evaluation. Together, these two measurements provide a more reliable B-annulus evaluation with radial coverage and azimuthal mapping.