Acoustic Sensor Liner Cement Top Depth Detection
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Solution Overview
Problem
The challenge in the resource recovery and fluid sequestration industries is the inability to accurately locate the top of cement during the cementation process in a borehole, which hinders effective control of the cementation operation.
Innovation Solution
A method and system utilizing an acoustic sensor within a liner to measure acoustic impedance in the annulus between the liner and the borehole wall, determining the depth of the wet cement surface by detecting changes in acoustic impedance, and performing operations based on this depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional cementation methods are used without real-time monitoring, then the cementation process can be completed, but the location of the cement top cannot be accurately determined
Solution Approach 1:
The patent replaces traditional mechanical level indicators or visual inspection methods with an acoustic measurement system. An acoustic sensor measures acoustic impedance in the annulus to detect the cement top location, substituting mechanical/visual detection with acoustic field-based detection to achieve precise real-time measurement of cement position.
Solution Approach 2:
The patent introduces acoustic impedance as an intermediary parameter to indirectly detect the cement top location. Instead of directly observing the cement interface, the system measures acoustic impedance variations in the annulus fluid, which change when the acoustic sensor encounters the cement-borne interface, thereby revealing the cement top position.
2Ease of operation
If no acoustic monitoring system is installed, then the device complexity remains low, but the ability to control cementation operation is insufficient
Solution Approach 1:
The acoustic sensor system is integrated into the liner itself, allowing the liner to perform dual functions: structural containment and acoustic measurement. The liner incorporates the acoustic sensor and processing electronics, enabling it to self-monitor the cementation process without requiring separate external monitoring equipment, thereby improving ease of operation while minimizing additional device complexity.
3Measurement precision
If real-time acoustic measurement is implemented, then cement top location can be precisely determined, but the device complexity increases
Solution Approach 1:
The acoustic sensor system is designed to serve multiple functions: detecting cement top location, monitoring cementation progress, and providing data for operational control decisions. By making the acoustic measurement system multi-functional, the patent justifies the added device complexity through enhanced measurement precision and additional operational benefits.
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
Enables real-time tracking and precise location of the cement top, allowing for controlled cementation processes and improved operational efficiency.
Implementation Method 1
measuring an acoustic impedance indicative of a type of a fluid in the annulus using an acoustic sensor disposed within the liner
Data Source
AI summary
A borehole system and a method of installing a liner in a borehole. A liner is disposed in the borehole. A cement is flowed into an annulus between the liner and a wall of the borehole. An acoustic sensor is disposed within the liner and measures an acoustic impedance of the annulus as the cement is flowing into the annulus. A processor determines a depth of an upper surface of the wet cement from the acoustic impedance and performs an operation based on the depth of the upper surface of the wet cement.