Multi-Mode Lamb Wave Evaluation for Cement Microannulus Detection
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Solution Overview
Problem
Existing cement bond evaluation techniques struggle to accurately detect microannulus formations and determine cement quality due to uncertainties and limitations in spatial resolution and sensitivity, particularly in the presence of microannulus, leading to costly and uncertain interpretations.
Innovation Solution
The use of symmetric lamb waves transmitted at specific angles and frequencies to detect microannulus formations by measuring attenuation characteristics, allowing for precise determination of cement quality and microannulus thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing cement bond evaluation techniques are used, then cement quality can be assessed, but detection accuracy of microannulus formations is insufficient due to limitations in spatial resolution and sensitivity
Solution Approach 1:
The evaluation technique is segmented into multiple independent measurement modes (acoustic impedance, shear wave, compressional wave) that can be applied separately or in combination. Each mode targets specific aspects of cement bond quality, allowing selective use based on detection needs without requiring full system complexity.
Solution Approach 2:
The patent introduces multi-dimensional measurement approaches by evaluating cement bond through multiple wave types (acoustic, shear, compressional) and multiple physical parameters (impedance, attenuation, velocity). This multi-dimensional characterization significantly improves microannulus detection accuracy compared to single-mode techniques.
2Reliability
If existing evaluation techniques are used, then cement bond can be assessed, but uncertainties in interpretation lead to costly re-evaluations
Solution Approach 1:
The system provides comprehensive feedback through multiple measurement modes that cross-validate each other. The acoustic impedance mode provides baseline cement quality assessment, while shear and compressional wave modes provide feedback on microannulus presence and cement properties, reducing interpretation uncertainty through mutually reinforcing data.
Solution Approach 2:
The evaluation system is designed with multi-functionality to assess various cement bond conditions using a single integrated approach. The same system can evaluate cement quality, detect microannulus formations, and characterize cement properties through different measurement modes, eliminating the need for multiple separate evaluation tools and reducing re-evaluation requirements.
3Measurement precision
If high sensitivity detection methods are used to detect microannulus, then detection accuracy improves, but the complexity and cost of the system increases
Solution Approach 1:
The high-sensitivity detection capability is segmented into three distinct measurement modes with different sensitivity characteristics. The acoustic impedance mode provides general cement quality assessment, while shear wave and compressional wave modes provide enhanced sensitivity for specific microannulus detection scenarios, allowing complexity to be distributed and selected based on needs.
Solution Approach 2:
The system achieves high sensitivity detection by changing measurement parameters (wave type, frequency, propagation direction) rather than increasing system complexity. Each measurement mode uses optimized parameters for detecting specific cement bond conditions, providing high sensitivity through parameter optimization rather than system complexity.
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
Enhances the accuracy of cement bond evaluation by providing sensitive detection of microannulus formations and thickness, reducing uncertainties and costs associated with existing methods.
Implementation Method 1
transmitting a first type of energy at a first angle to a surface of a casing of a wellbore... determining a first attenuation of the first type of energy
Implementation Method 2
determining a first attenuation of the first type of energy based on the first signal... determining whether microannulus formation is present based on one or more characteristics of the first attenuation
Data Source
AI summary
Aspects of the subject technology relate to systems, methods, and computer-readable media for determining a quality of cementation and detecting a presence of microannulus formations within the cement bonded to the casing. An example method may include transmitting a first type of energy at a first angle to a surface of a casing of a wellbore. In some instances, the casing may be bonded to cement layer that is between the casing and a formation of the wellbore. Additionally, the example method may include receiving a first signal from the casing. Moreover, the example method may include determining a first attenuation of the first type of energy based on the first signal. Further, the example method may include determining whether microannulus formation is present between the casing and the cement layer based on one or more characteristics of the first attenuation.