Product Sheet Epilogue Dual-String Barrier Evaluation
Evaluate the A- and B-annuli without inner-pipe removal during well decommissioning operations.
Dual-string barrier evaluation
Well integrity evaluation without removing inner pipe (casing or tubing), saving time and cost
Continuous measurement of well liquid properties in A-annulus and pipe-to-pipe standoff
Industry's only simultaneous A- and B-annuli evaluation with environmental corrections: corrected bond index, segmented bond log, and 360° azimuthal maps
During the plug and abandonment (P&A) well decommissioning phase, conventional barrier evaluation operations require removal of inner pipe (casing or tubing) to evaluate the B-annulus and assess well integrity. This traditional approach to barrier or cement evaluation may take several days per well, depending on the operational complexity—increasing rig time and costs. With Epilogue™ dual-string barrier evaluation, you no longer have to remove the inner pipe, enabling you to evaluate both the A- and B-annulus in a single run. This approach completely revolutionizes conventional operations to reduce P&A rig days, costs, and overall carbon footprint. And when performing rigless well integrity evaluation logging, you can use the evaluation insights in the P&A job design stage to optimize future opex and minimize contingencies.
Building on years of innovative well integrity evaluation technology, Epilogue dual-string barrier evaluation offers the most advanced and accurate method for imaging the annular profile in the B-annulus, overcoming crucial well conditions that may affect B-annulus interpretation.
Epilogue dual-string barrier evaluation leverages a unique combination of wireline-conveyed, deep-array multimode sonic (0.5–20 kHz) and multimodality ultrasonic (100–500 kHz) measurements. The low-frequency sonic measurement provides the B-annulus evaluation. Unlike conventional tools that provide only monopole sonic measurement, multimodality ultrasonic measurement from Epilogue dual-string barrier evaluation provides crucial information such as pipe-to-pipe standoff and A-annulus liquid type. The combination of multimode sonic and multimodality ultrasonic measurements provides a more reliable B-annulus evaluation with radial coverage and azimuthal mapping that applies environmental corrections.
With the richness of deep-array multimode sonic and multimodality ultrasonic measurements, Epilogue dual-string barrier evaluation delivers output levels that suit your well objectives and operational requirements. The B-annulus bond index view (Level 1) enables you to evaluate the top of cement or solids and the intervals of poor or moderate bonded sections. To better determine barrier quality, Level 2 uses ultrasonic measurement to apply environmental corrections (minimum recommended level). The segmented bond log derived independently from the eight azimuthal receivers and monopole transmitter provides the bond quality around the casing (Level 3). The most advanced deliverable (Level 4) provides 360° high-resolution images to evaluate the B-annulus.
New technology enables bond quality evaluation without casing removal.Read Article
The need to evaluate cement behind multiple casing strings has become critical for well P&A or slot recovery. This technical paper discusses how P&A operations can be optimized in offshore applications using Epilogue dual-string barrier evaluation technology to reduce the costs associated with rig time and potentially the unnecessary removal of casing strings.Read Premium Content