Multi-frequency Acoustic Velocity Measurement for Core Analysis
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Solution Overview
Problem
Existing acoustic velocity measurement devices for cores cannot rapidly measure acoustic velocity under high temperature, high pressure, and multi-frequency conditions, requiring frequent probe replacements and increasing operational complexity and cost.
Innovation Solution
A multi-frequency acoustic velocity measurement device comprising a fixing device, transmitting and receiving acoustic wave probes, and a control unit that controls the transmission of acoustic wave signals of different frequencies, allowing for rapid measurement of acoustic velocity without replacing probes, using a single-chip microcomputer, signal generator, and signal amplifying circuits to determine acoustic velocity based on signal time and core length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If acoustic wave probes of different frequencies are replaced to measure acoustic velocity at multiple frequencies, then measurement coverage across different frequencies is improved, but measurement time increases and operational efficiency deteriorates
Solution Approach 1:
The patent employs a single acoustic wave probe that can operate across multiple frequency ranges (low-frequency 2-2000 Hz and high-frequency ultrasonic) rather than requiring separate specialized probes for each frequency band. This multi-functional probe design eliminates the need for frequent probe replacements while maintaining comprehensive frequency measurement capability, directly resolving the contradiction between measurement coverage and measurement speed
2Adaptability or versatility
If acoustic wave probes are replaced under high temperature and high pressure conditions, then multi-frequency measurement capability is maintained, but operational complexity and cost increase
Solution Approach 1:
The single acoustic wave probe is designed to function across both low-frequency and high-frequency ranges, eliminating the need for probe replacement even under high temperature and high pressure conditions. The control unit automatically manages frequency switching, reducing operational complexity and eliminating the risks associated with probe replacement in harsh environments
Solution Approach 2:
The patent replaces the mechanical probe replacement operation with an electronic frequency switching mechanism controlled by the control unit. The control unit generates different frequency signals to drive the single probe, substituting manual mechanical intervention with automated electronic control, thereby reducing operational complexity especially under high temperature and high pressure conditions
3Ease of operation
If a single acoustic wave probe is used to measure multiple frequencies, then operational complexity is reduced, but the ability to cover different frequency ranges may be limited
Solution Approach 1:
The acoustic wave probe is designed with dynamic frequency adaptability, allowing it to operate across both low-frequency (2-2000 Hz) and high-frequency (ultrasonic) ranges. The control unit dynamically adjusts the operating frequency based on measurement requirements, enabling the single probe to adapt to different frequency demands without sacrificing versatility
Solution Approach 2:
The system changes the operating frequency parameter of the single acoustic wave probe according to measurement needs. The control unit generates different frequency signals to excite the probe, allowing the same physical probe to operate across different frequency ranges by changing its operating parameters rather than changing the probe itself
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 rapid and efficient measurement of acoustic velocity at various frequencies under high temperature and high pressure conditions, reducing operational complexity and cost by eliminating the need for frequent probe replacements.
Implementation Method 1
the transmitting end acoustic wave probe is configured to transmit a first acoustic wave signal to the core and a second acoustic wave signal to the receiving end acoustic wave probe
Implementation Method 2
the receiving end acoustic wave probe is configured to receive the second acoustic wave signal and the first acoustic wave signal passing through the core
Implementation Method 3
The fluid in rock pores will cause acoustic dispersion, and the phenomenon of acoustic dispersion varies with different fluid content in the pores
Data Source
AI summary
A multi-frequency acoustic velocity measurement device for a core includes: a fixing device, for fixing a core and heating and pressurizing the core according to a preset condition; a transmitting end acoustic wave probe, connected to a first end of a control unit and one end of the fixing device, and configured to transmit an acoustic wave signal to the core; a receiving end acoustic wave probe, connected to a second end of the control unit and the other end of the fixing device, and configured to receive the acoustic wave signal transmitted by the transmitting end acoustic wave probe; and the control unit, for controlling the transmitting end acoustic wave probe to transmit acoustic wave signals of different frequencies, receiving the acoustic wave signal received by the receiving end acoustic wave probe, and determining an acoustic velocity of the core according to the acoustic wave signal.