Nonflammable Ester Fill Liquids for High-Temperature Pressure Balancing
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Solution Overview
Problem
Existing well logging technologies face challenges in measuring earth properties at high pressures and temperatures due to malfunctioning instrument cells, as conventional fill liquids either vaporize or catch fire at elevated temperatures.
Innovation Solution
The use of nonflammable fill liquids, such as natural ester-based and room temperature ionic liquids, which remain in a liquid state from 20° C to 300° C, ensuring the instrument cells function effectively across a wide temperature range without risking fires or solidification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fill liquids are used in instrument cells at high temperatures, then the instrument cell can be filled with a liquid to equalize pressure, but the high temperature causes the liquid to vaporize or catch fire, leading to malfunction
Solution Approach 1:
The patent changes the chemical composition parameters of the fill liquid by using ester-based fluids (such as natural ester oils) instead of conventional petroleum-based liquids. These ester-based fluids have inherently higher flash points and thermal stability, allowing them to resist vaporization and combustion at high temperatures while maintaining liquid state for pressure equalization
Solution Approach 2:
The patent employs composite fluid formulations, specifically ester-based liquids that combine the properties of high flash point, thermal stability, and appropriate viscosity. These composite materials integrate multiple desirable properties into a single fill liquid that can operate reliably in high-temperature borehole environments
2Measurement precision
If the logging tool is conveyed to deep boreholes to perform measurements, then measurements can be obtained from high pressure and high temperature zones, but the high temperature adversely affects the fill liquid causing the instrument cell to malfunction
Solution Approach 1:
The patent modifies the thermal parameters of the fill liquid by selecting ester-based fluids with elevated flash points and improved thermal stability. These parameter changes enable the liquid to maintain its physical state and functional properties at the high temperatures encountered in deep borehole measurements
Solution Approach 2:
The patent uses fill liquids that are specifically selected for their thermal stability characteristics, accepting that the fill liquid may be consumed or degraded over time in extreme conditions, but choosing materials that provide sufficient service life for the measurement mission
3Stress or pressure
If high pressure equalization is achieved using conventional liquids, then the instrument cell is protected from crushing, but the liquids become flammable or vaporize at high temperatures exceeding 300° C.
Solution Approach 1:
The patent changes the physical and chemical parameters of the fill liquid by using ester-based fluids with higher boiling points and flash points. These parameter changes allow the liquid to maintain pressure equalization function while resisting vaporization and combustion at temperatures exceeding 300° C.
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
These fill liquids maintain the instrument cells' operational integrity by preventing fires and ensuring proper function at extreme temperatures, allowing for accurate measurements in boreholes.
Implementation Method 1
a fill liquid that remains in a liquid state and is nonflammable from 20° C. to 300° C.
Implementation Method 2
nonflammable from 20° C. to 300° C.
Data Source
AI summary
An apparatus for performing a measurement in a borehole penetrating the earth, the apparatus including: a logging tool; an enclosed instrument cell disposed at the logging tool, the instrument cell being configured to perform the measurement; and a fill liquid disposed in the cell wherein the fill liquid remains in a liquid state and is nonflammable from 20° C. to 300° C.