Tuning Fork Resonator Geometry for HPHT Pressure Sensing
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Solution Overview
Problem
Existing sensors for measuring downhole properties in wells, such as pressure and temperature, face challenges in accuracy and reliability, especially in high-pressure and high-temperature environments, due to limitations in materials and temperature compensation.
Innovation Solution
The development of a sensor apparatus featuring a double-ended tuning fork piezoelectric resonator with non-parallel tines, integrated with a temperature compensation mechanism, utilizing materials like Langasite-family crystals that maintain piezoelectric properties at high temperatures, and employing devitrifying glass for sealing and bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensors are used for downhole measurements, then basic measurement functionality is provided, but measurement precision and reliability deteriorate in high-pressure and high-temperature environments
Solution Approach 1:
The patent changes the material parameters by using Langasite-family crystals instead of conventional piezoelectric materials. These crystals maintain stable piezoelectric properties at high temperatures, directly addressing the reliability issue in high-temperature environments while preserving measurement precision
Solution Approach 2:
The patent employs composite material structures including Langasite-family crystal substrates combined with devitrifying glass seals and bonding layers. This composite approach enables the sensor to withstand high-pressure and high-temperature conditions while maintaining measurement accuracy through the synergistic properties of different materials
2Measurement precision
If temperature compensation mechanisms are added to improve measurement accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent merges the temperature sensing and pressure sensing functions into a single integrated sensor device. The Langasite-family crystal resonator simultaneously provides both temperature measurement capability and pressure measurement capability, eliminating the need for separate compensation mechanisms and reducing overall device complexity
Solution Approach 2:
The piezoelectric resonator made from Langasite-family crystals serves multiple functions: it acts as both the pressure-sensitive element and the temperature-sensitive element. This multi-functionality enables temperature compensation to be performed using the same component that measures pressure, thereby improving precision without significantly increasing device 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
This solution enables accurate and reliable measurement of pressure and temperature in harsh downhole conditions, with reduced pressure drift over time and improved precision, stability, and range of measurement.
Implementation Method 1
a sensor with a sensing element that has a double-ended tuning fork piezoelectric resonator
Implementation Method 2
double-ended tuning fork piezoelectric resonator includes two tines spaced apart from one another to form a slot between the tines
Implementation Method 3
measuring temperature of the fluid with the sensor and using the measured temperature to perform temperature compensation on the measured pressure
Data Source
AI summary
Resonating sensors for use in high-pressure and high-temperature environments are provided. In one embodiment, an apparatus includes a sensor with a double-ended tuning fork piezoelectric resonator that includes a first tine and a second tine. These tines are spaced apart from one another so as to form a slot between the first and second tines. The width of the slot from the first tine to the second tine varies along the lengths of the first and second tines. Various other resonators, devices, systems, and methods are also disclosed.