Downhole Mass Spectrometer Ionization for Hydrocarbon Analysis
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Solution Overview
Problem
Surface mud gas logging techniques face limitations due to contamination and inaccuracy in measuring hydrocarbon compositions, particularly in determining the depth and quality of oil reservoirs, as they rely on inferred measurements and are prone to contamination from air and previous drilling fluids.
Innovation Solution
A method utilizing a mass spectrometer to analyze fluid properties downhole, combining electron and chemical ionization to calculate hydrocarbon concentrations, which involves creating a tool response matrix to accurately determine component concentrations in the presence of methane and iso-butane, accounting for chemical ionization effects and pressure dependencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If surface mud gas logging is used to analyze hydrocarbon composition, then gas analysis can be performed onsite, but the measurements are prone to contamination from air and previously drilled layers
Solution Approach 1:
The measurement process is segmented into two distinct locations: surface-level gas extraction and downhole mass spectrometric analysis. By separating the sampling function (at surface) from the analysis function (at downhole), the system eliminates contamination risks during sample transport and depth inference, while maintaining ease of onsite operation.
Solution Approach 2:
The patent introduces an intermediary system - the downhole mass spectrometer with chemical ionization capability - that acts as a mediator between the drilled formation and surface analysis equipment. This intermediary performs the critical measurement function at the optimal location (downhole) while allowing surface-level operational simplicity.
2Device complexity
If depth is inferred from gross measurements of mud transit time and average mud velocity, then depth estimation is simple, but the measurements are intrinsically inaccurate
Solution Approach 1:
Instead of inferring depth from surface measurements (traditional approach), the patent inverts the approach by directly measuring depth and composition at the downhole location where the mass spectrometer is positioned. This eliminates the need for indirect calculations based on mud transit time and velocity, providing both operational simplicity and measurement accuracy simultaneously.
3Measurement precision
If combined electron and chemical ionization is used in mass spectrometry, then hydrocarbon concentration accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent merges two ionization techniques (electron ionization and chemical ionization) into a single mass spectrometer system. By combining these methods, the system achieves superior hydrocarbon concentration accuracy through complementary detection capabilities, while the integrated design minimizes the complexity increase that would result from separate systems.
Solution Approach 2:
The mass spectrometer is designed with multi-functionality, capable of performing both electron ionization and chemical ionization analyses within a single instrument. This universal design allows the system to handle diverse hydrocarbon analysis requirements accurately without requiring multiple specialized devices, thereby managing complexity efficiently.
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 approach enhances the accuracy of hydrocarbon composition analysis by reducing contamination errors and providing real-time, precise data for geosteering and reservoir mapping, improving well placement and reservoir continuity.
Implementation Method 1
A method utilizing a mass spectrometer to analyze fluid properties downhole, combining electron and chemical ionization
Implementation Method 2
A method utilizing a mass spectrometer to analyze fluid properties downhole, combining electron and chemical ionization
Data Source
AI summary
Methods and apparatus for obtaining a mass spectrum of a sample and determining a concentration of a component of the sample by utilizing a model of chemical and electron ionization and the obtained mass spectrum.