Natural Gamma Ray Spectroscopy for Borehole Density
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Solution Overview
Problem
Current methods for oil and gas exploration lack efficient and accurate techniques for determining the densities of borehole fluid and annular space in real-time, which are crucial for precise drilling operations and formation evaluation.
Innovation Solution
The use of natural gamma ray spectroscopy to measure and process energy spectra deviations in selected energy windows, allowing for the determination of borehole fluid and annular space densities without requiring additional detectors or tool designs, utilizing a gamma ray sensor package with a scintillator and photomultiplier tube to convert gamma rays into electrical signals for analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional measurement techniques are used to determine borehole fluid and annular space densities, then the measurement process requires additional detectors and specialized tool designs, but this increases device complexity and measurement time
Solution Approach 1:
The patent applies universality by enabling conventional gamma ray detection systems to perform multiple functions: their primary function of measuring formation properties and an additional function of determining borehole fluid and annular space densities. This is achieved by analyzing energy spectra deviations in the gamma ray measurements, allowing the same detector to serve dual purposes without requiring specialized additional equipment.
Solution Approach 2:
The patent applies self-service by utilizing the energy spectra information already captured by conventional gamma ray detectors for formation evaluation. Instead of requiring separate dedicated detectors, the system extracts density information from the existing measurement data by analyzing spectral deviations, allowing the measurement system to serve itself for multiple objectives.
2Measurement precision
If additional detectors and specialized tool designs are implemented to measure fluid and annular space densities, then measurement capabilities are enhanced, but this increases device complexity and potentially measurement time
Solution Approach 1:
The patent applies continuity of useful action by performing density measurements continuously during常规 gamma ray logging operations. The energy spectra analysis is integrated into the existing measurement workflow, allowing density determination to occur simultaneously with formation evaluation rather than as a separate time-consuming process.
Solution Approach 2:
The patent applies partial action by utilizing only the energy spectra deviation information from conventional gamma ray measurements that is relevant to density determination. Instead of requiring complete additional measurement systems, the method extracts sufficient density information from the existing spectral data through targeted analysis of specific energy window deviations.
3Adaptability or versatility
If conventional gamma ray detection systems are used without spectral analysis, then the system remains simple, but it cannot determine borehole fluid and annular space densities
Solution Approach 1:
The patent applies segmentation by dividing the gamma ray energy spectrum into multiple energy windows and analyzing deviations in each window separately. This segmentation of the spectral analysis allows the system to extract density information from different energy ranges, enhancing measurement versatility while using systematic processing of divided spectral components.
Solution Approach 2:
The patent applies parameter changes by utilizing variations in the energy spectra parameters (counts in different energy windows) to determine density. The method detects changes in spectral parameters caused by photoelectric absorption effects and uses these parameter variations to infer borehole fluid and annular space densities, transforming conventional measurement data into additional information.
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 in-situ real-time fluid density measurement and annular space density determination, providing accurate data for improved drilling operations and formation evaluation, with no need for extra detector or tool design beyond conventional gamma ray detection systems.
Implementation Method 1
a gamma ray sensor package with a scintillator and photomultiplier tube to convert gamma rays into electrical signals for analysis
Implementation Method 2
utilize the deviation of energy spectra of detected gamma rays... Gamma rays emitted from the formation are attenuated by the materials between the formation and detector disposed downhole
Data Source
AI summary
Various apparatus or methods are arranged to operate a tool downhole in a well, where the tool has a detection package operable to detect gamma rays. Deviation of energy spectra of detected gamma rays in each selected energy window of a set of selected energy windows with respect to reference energy spectra of the respective selected energy window can be detected. One or more properties of one or more regions around the tool can be determined from the deviations, the regions being between the tool and a source of the detected gamma rays in a formation around the well. Additional apparatus, systems, and methods having a gamma ray detection package can operate in a variety of applications.