Nuclear Logging Tool with Dual-Function Detectors for Real-Time Oil Saturation
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Solution Overview
Problem
Existing nuclear logging tools require multiple instruments to measure formation type, porosity, and C/O ratios separately, making real-time oil saturation estimation during drilling operations challenging and inefficient.
Innovation Solution
A nuclear logging tool with multiple dual-function detectors that can simultaneously detect neutrons and gamma rays, allowing for the simultaneous measurement of formation mineralogy, porosity, and C/O ratios to determine formation type and oil saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate logging tools are used to measure formation type, porosity, and C/O ratios, then measurement precision is improved, but device complexity and operation time increase
Solution Approach 1:
The patent combines multiple separate logging tools into a single integrated nuclear logging tool that simultaneously measures formation type, porosity, and C/O ratios. The tool integrates a neutron source with multiple dual-function detectors that can detect both neutrons and gamma rays, eliminating the need for multiple separate instruments while maintaining measurement precision through simultaneous data collection from all parameters.
Solution Approach 2:
The logging tool employs dual-function detectors that can detect both neutrons and gamma rays, making each detector capable of performing multiple measurement functions. This multi-functionality allows the single tool to replace multiple specialized tools while maintaining the precision required for accurate formation evaluation across all measured parameters.
2Measurement precision
If multiple separate logging tools are used to measure formation parameters, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent merges multiple logging measurements into a single simultaneous operation. The integrated tool collects data on formation type, porosity, and C/O ratios at the same time and location, eliminating the sequential time loss associated with running multiple separate tools while preserving measurement precision through consistent simultaneous measurement conditions.
Solution Approach 2:
The logging tool performs continuous simultaneous measurements of all formation parameters in a single operational pass. The dual-function detectors continuously collect both neutron and gamma ray data throughout the logging process, ensuring uninterrupted data acquisition for all parameters without the time losses inherent in sequential tool deployments.
3Measurement precision
If multiple separate logging tools are used, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent consolidates multiple logging operations into a single tool deployment and measurement process. The integrated system automatically performs all necessary measurements simultaneously, reducing the operational complexity of coordinating multiple tools, multiple deployments, and multiple processing workflows while maintaining precision through unified data collection.
Solution Approach 2:
The dual-function detectors provide universal detection capability for both neutrons and gamma rays within a single operational framework. This multi-functionality simplifies operation by eliminating the need to switch between different specialized tools and procedures, allowing operators to obtain all formation parameters through a single standardized measurement process.
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 faster and real-time assessment of formation oil saturation and other parameters, reducing the need for multiple logging tools and operations while improving accuracy by integrating neutron sources and dual-function detectors.
Implementation Method 1
three or more detectors configured to simultaneously detect neutrons and gamma rays
Implementation Method 2
three or more detectors configured to simultaneously detect neutrons and gamma rays
Implementation Method 3
one or more neutron sources to emit neutrons into the subterranean formation
Implementation Method 4
separating electric signals from neutrons and gamma rays for each of the three or more detectors
Implementation Method 5
obtaining energy spectrum form inelastic gamma rays and energy spectrum from capture gamma rays
Implementation Method 6
energy spectrum from capture gamma rays
Implementation Method 7
obtaining single element gamma ray energy spectrum for each of a plurality of elements; calculating an elemental yield of each element to obtain concentration of each element in the formation
Data Source
AI summary
A method for measuring an oil saturation value of a subterrain formation uses a tool having multiple dual-function detectors that detect neutrons and gamma rays. The method includes emitting neutrons into the formation, detecting neutrons and gamma ray signals form the formation using the detectors, determining formation parameters including the formation type and formation porosity, and further determining parameters such as C/O ratios at each of the detectors, a total neutron count rate at each of detectors, a fast neutron count rate at each of detectors, and a thermal neutron count rate at each of the three or more detector, and calculating the oil saturation value using the determined parameters.