High Pressure Fluid Densitometer Using Magnetic Piston Displacement
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Solution Overview
Problem
Existing devices for measuring density and volume changes of fluids and solids under high temperature and pressure conditions, such as in oil and geothermal drilling, are limited by complex mechanical structures, use of toxic fluids, inability to withstand high pressures, and lack of automated data recording.
Innovation Solution
A cylindrical pressure cell with a sealed piston that moves vertically within the cell, allowing for high-pressure and high-temperature testing, equipped with a magnetometer to digitally record volume changes, and a pressurization system that prevents contamination by using non-toxic fluids and minimizing maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dilatometer with optical components is used to measure volume changes, then measurement capability is provided, but the device cannot withstand very high pressure
Solution Approach 1:
The patent replaces optical measurement components with a magnetic field-based measurement system. A magnet is attached to the piston, and a magnetometer externally measures the magnetic field changes as the piston moves, eliminating the need for optical components that cannot withstand high pressure while maintaining measurement capability.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the piston movement and the external measurement system. The magnet attached to the piston transfers mechanical displacement information to the external magnetometer through magnetic field changes, allowing indirect measurement that bypasses the pressure barrier.
2Measurement precision
If a pycnometer with mechanical indicators is used to measure density changes, then measurement capability is provided, but data recording capability is lacking
Solution Approach 1:
The patent incorporates a magnetometer that continuously monitors magnetic field changes and provides real-time feedback on piston position. This enables automated data recording of volume changes, transforming the manual reading process into an automated measurement and recording system.
Solution Approach 2:
The patent replaces mechanical indicator systems with a magnetic field-based detection system coupled with electronic data recording, enabling automated capture and storage of measurement data without manual intervention.
3Measurement precision
If a piston movement is mechanically transferred through a seal to measure volume changes, then measurement capability is provided, but measurement errors are introduced and sealing difficulty increases above 10,000 psi
Solution Approach 1:
The patent replaces mechanical coupling through seals with a magnetic field-based measurement system. The magnet on the piston interacts with the external magnetometer through the pressure medium without requiring physical penetration or sealing, eliminating seal-related measurement errors and sealing difficulties at high pressures.
Solution Approach 2:
The patent uses the magnetic field as an intermediary to transfer measurement information across the pressure boundary without requiring mechanical penetration. This allows accurate measurement of piston position while maintaining the integrity of the high-pressure seal.
4Measurement precision
If complex mechanical structures are used in densitometers, then measurement capability is provided, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent replaces complex mechanical transmission and measurement mechanisms with a simplified system consisting of a magnet attached to the piston and an external magnetometer. This substitution dramatically reduces mechanical complexity while maintaining measurement precision.
Solution Approach 2:
The patent extracts the measurement function from the high-pressure environment by using external magnetic field sensing. The complex measurement electronics and components are located outside the pressure vessel, leaving only a simple magnet inside, thereby reducing internal 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
Enables accurate, reliable, and automated measurement of density changes in fluids and solids under simulated drilling conditions, with reduced maintenance requirements and the ability to withstand high pressures up to 60,000 psi.
Implementation Method 1
a magnetometer is positioned directly above the pressure cell. The upper section of the pressure cell also contains a magnet attached to the top of said sealed piston so that as the piston changes position vertically, the distance from the magnet to the magnetometer changes correspondingly
Implementation Method 2
A heater is positioned radially around the bottom of the pressure cell
Implementation Method 3
Pressure is applied to the top of the piston via pressurization fluid injected into the upper section of the pressure cell
Data Source
AI summary
A method and apparatus for monitoring liquid volume change consists of a cylindrical cell assembly (80) capable of withstanding high pressure and high temperature with a sealed movable piston (24) separating a pressurization fluid (11) from a sample (25). A top magnet (72) moves with piston (24) and its movement is measured by a magnetometer (10). Heat is provided via a heater (52) and pressure is controlled via pressurization fluid (11).