The Schlumberger 7071 is a specialized dual-string barrier evaluation component designed for well integrity assessment in oil and gas operations. Operating within the Epilogue system architecture, it performs simultaneous sonic and ultrasonic measurements to evaluate annular cement integrity without inner pipe removal. The instrument delivers corrected bond indices, segmented bond logs, and high-resolution 360° azimuthal mapping data for comprehensive wellbore characterization.
Technical Specifications
• Sonic measurement range: 0.5–20 kHz (deep-array multimode)
• Ultrasonic measurement range: 100–500 kHz (multimodality)
• Provides dual A- and B-annulus evaluation in single run
• Environmental corrections applied for accurate interpretation
• Level 4 deliverable: 360° high-resolution B-annulus imaging
• Determines pipe-to-pipe standoff and A-annulus liquid type identification
– Key Features
• Eliminates requirement for inner pipe removal during evaluation
• Multiple levels of B-annulus assessment capability
• Segmented bond log generation with corrected bond index output
• Azimuthal mapping resolves spatial cement distribution across wellbore
• Environmental compensation ensures data validity across varying downhole conditions
– Typical Applications
• Well integrity evaluation and cement bond assessment
• Plug and abandonment (P&A) well decommissioning
• Sidetrack well candidate selection
• Drilling timeline optimization for new wells
• Carbon sequestration time-lapse monitoring
• Production well time-lapse surveillance
– Compatibility & Integration
The 7071 functions as a modular component within Schlumberger’s Epilogue system framework. Integration with surface acquisition and processing packages enables real-time data streaming and post-job interpretation workflows typical of wireline-deployed downhole tools.
