Cement Evaluation Tool Ringing Reduction for Clearer Echo Signals
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Solution Overview
Problem
Cement impedance measurement tools in well drilling operations face reduced accuracy due to noise from firing mechanisms and electrical ringing, which distorts echo signals and affects the integrity of cement bonds in well casings.
Innovation Solution
A casing and cement evaluation tool with a ringing reduction system that includes circuitry to selectively dissipate residual electrical energy from the amplifier, filter, and transducer, using dump circuits to reduce noise and improve signal accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the amplifier and transducer are used to transmit acoustic pulses, then the measurement capability is improved, but electrical ringing and noise are generated that reduce signal accuracy
Solution Approach 1:
The patent extracts and removes the harmful electrical ringing from the system by introducing a dump circuit that selectively dissipates residual electrical energy from the amplifier and transducer. This separates the useful acoustic pulse transmission function from the harmful electrical ringing, allowing the measurement system to operate without the detrimental effects of electrical resonance.
Solution Approach 2:
The patent converts the harmful electrical ringing energy into a beneficial dissipation process by using the dump circuit to controlledly release the stored electrical energy. The energy that would otherwise create harmful interference is instead channeled through a controlled dissipation path, transforming a harmful factor into a manageable process that protects the measurement system.
2Measurement precision
If the firing mechanism is activated to generate acoustic pulses, then the evaluation capability is improved, but noise from the firing mechanism distorts the echo signal
Solution Approach 1:
The patent extracts the harmful noise component from the firing mechanism by separating the pulse generation function from the noise generation. The dump circuit is introduced to specifically remove the harmful electrical ringing and noise from the amplifier and transducer, allowing the acoustic pulse transmission to proceed without the detrimental noise that would otherwise distort the echo signal.
Solution Approach 2:
The dump circuit acts as an intermediary element between the amplifier/transducer and the measurement system. It mediates by selectively dissipating harmful electrical energy while allowing the useful acoustic pulse function to proceed, thus protecting the echo signal from distortion without interfering with the primary measurement capability.
3Productivity
If residual electrical energy is allowed to remain in the amplifier and transducer, then the system remains ready for immediate operation, but noise and distortion increase
Solution Approach 1:
The patent implements periodic action by using a controlled gate signal to periodically activate the dump circuit. Rather than continuously dissipating energy (which would reduce readiness), the system periodically releases residual electrical energy at controlled intervals, maintaining operational readiness while preventing harmful noise accumulation. This periodic energy dissipation balances productivity with noise reduction.
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
The tool effectively reduces noise and enhances the accuracy of cement impedance calculations by minimizing electrical ringing, thereby improving the integrity of cement bonds and well casing stability.
Implementation Method 1
A transducer may be coupled to an output of the filter. The transducer may transmit an acoustic pulse into the casing and cement layer
Implementation Method 2
The transducer may receive an echo signal of the acoustic pulse
Implementation Method 3
A casing and cement evaluation tool with a ringing reduction system that includes circuitry to selectively dissipate residual electrical energy from the amplifier, filter, and transducer
Data Source
AI summary
An example cement and casing evaluation tool includes an amplifier and a filter coupled an output of the amplifier. A transducer may be coupled to the output of the filter. A ringing reduction system may be coupled to at least one of the amplifier, the filter, and the transducer, wherein the ringing reduction system selectively dissipates energy from at least one of the amplifier, the filter, and the transducer in response to a control signal.