Cement Evaluation via Sonic and Ultrasonic Acoustic Impedance Comparison
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Solution Overview
Problem
Current acoustic measurement techniques face challenges in accurately evaluating cement integrity behind a well casing, particularly in distinguishing between well-bonded, partially bonded, wet microannulus, and dry microannulus conditions, due to limitations in interpreting detailed cement characteristics and accounting for microannulus characteristics.
Innovation Solution
Integration of sonic and ultrasonic acoustic measurements to derive and compare acoustic impedances, allowing classification of annular fill material as well-bonded, partially bonded, wet microannulus, or dry microannulus based on specific impedance comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple modes of acoustic measurements are used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple acoustic measurement modes (sonic and ultrasonic measurements) into a single integrated evaluation system. By merging these different measurement techniques, the system achieves more precise cement characterization while managing device complexity through unified data processing methods that compare acoustic impedances derived from each measurement type.
2Measurement precision
If detailed cement characteristics are analyzed, then measurement precision is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent changes the measurement parameters by using multiple acoustic frequency ranges (sonic and ultrasonic) and deriving different acoustic impedance values from each. This parameter variation enables the detection of subtle cement characteristics and microannulus conditions that would be difficult to detect using a single measurement parameter, thereby improving measurement precision while managing detection difficulty.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy of cement evaluation by providing more precise characterization of annular fill material, improving the assessment of cement integrity and zonal isolation in wellbore completions.
Implementation Method 1
These acoustic tools may use pulsed acoustic waves as they are lowered through the wellbore to obtain acoustic cement evaluation data
Implementation Method 2
The method includes deriving a sonic-derived acoustic impedance Z(sonic) from the sonic measurements deriving an ultrasonic-derived acoustic impedance Z(ultrasonic) from the ultrasonic measurements
Data Source
AI summary
Systems, methods, and devices for evaluating proper cement installation in a well are provided. In one example, a method includes receiving acoustic cement evaluation data into a data processing system. The acoustic cement evaluation data derives from one or more acoustic downhole tools used over a depth interval in a well having a casing. The acoustic cement evaluation data includes sonic measurements and ultrasonic measurements. The method includes deriving a sonic-derived acoustic impedance Z(sonic) from the sonic measurements deriving an ultrasonic-derived acoustic impedance Z(ultrasonic) from the ultrasonic measurements comparing the Z(sonic) with respect to the Z(ultrasonic), and determining whether an annular fill behind the casing is well bonded, partially bonded, comprises wet microannulus, or comprises dry microannulus based on the comparison of the Z(sonic) with respect to the Z(ultrasonic).