Cement bond well logging with a dipole tool employing depth related cutoff modes

The integration of ultrasonic and dipole transmitters in a logging tool enhances cement bond evaluation by accurately distinguishing between micro-debonding and significant failures, ensuring precise cement bonding assessment and minimizing costly interventions.

WO2026136687A1PCT designated stage Publication Date: 2026-06-25SCHLUMBERGER TECH CORP +3
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SCHLUMBERGER TECH CORP
Filing Date
2025-12-18
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Conventional acoustic cement evaluation tools provide inaccurate indications of cement bond failure at the casing and formation interface due to their limited lateral depth of inspection, often leading to false positives and unnecessary remedial actions.

Method used

Employing a logging tool equipped with both ultrasonic and dipole transmitters to assess cement bonding, where ultrasonic transmitters provide information within 250 microns of the casing surface and dipole transmitters extend the evaluation depth beyond 250 microns, using lateral pressure pulses to detect cement bonding conditions up to several feet.

Benefits of technology

The combined use of ultrasonic and dipole transmitters allows for accurate differentiation between micro-debonding and substantial cement failures, reducing unnecessary remedial actions and saving time and costs by confirming the overall integrity of cement bonding.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure US2025060346_25062026_PF_FP_ABST
    Figure US2025060346_25062026_PF_FP_ABST
Patent Text Reader

Abstract

A technique for determining cement bond logging analysis for a cased well. The technique is directed at obtaining more in depth information regarding overall cement bond integrity so as to avoid premature remedial intervention based on false indication of compromised cement bonding at the casing and formation interface. This includes incorporating a dipole transmitter at a logging tool that is configured to emit lateral pressure pulses toward the casing in order to obtain dipole waveforms back from at least one predetermined cutoff depth that is beyond that of an ultrasonic wave reach outside of the casing. This may be undertaken in light of information previously obtained from ultrasonic detections indicative of at least some degree of micro-debonding and may be followed by remedial intervention once confirmed that the micro-debonding is exceeded to a point of compromised integrity of the cement bond.
Need to check novelty before this filing date? Find Prior Art