Tracer Tag Fluid Injection for Wellbore Cutting Depth Accuracy
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Solution Overview
Problem
The mixing of wellbore cuttings from different depths during the drilling process degrades the accuracy and veracity of mud logging analysis, making it less useful for extracting oil and gas.
Innovation Solution
Injecting multiple tracer tag fluids with synthesized polymeric nanoparticles into a wellbore at specific concentrations and sequences, where the nanoparticles bind to wellbore cuttings and undergo thermal de-polymerization to generate unique mass spectra, allowing for precise depth correlation of cuttings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple tracer tag fluids are injected into the wellbore to tag cuttings from different depths, then the depth accuracy and veracity of mud logging analysis is improved, but the complexity of the injection process and fluid management increases
Solution Approach 1:
The injection process is segmented into multiple independent fluid injections, each targeting a specific depth interval. Multiple tracer tag fluids with different concentrations are injected sequentially, allowing each fluid to tag cuttings from a specific depth zone. This segmentation enables precise depth identification while maintaining manageable injection sequences.
Solution Approach 2:
The injection sequence and concentrations are predetermined before the tagging operation begins. The system pre-plans which tracer tag fluids to inject at which depths and in what order, allowing for optimized depth coverage and simplified real-time execution. This preliminary planning reduces on-site decision complexity.
2Measurement precision
If tracer tag fluids are injected continuously to tag all cuttings, then complete depth coverage is achieved, but mixing between different tracer tag fluids occurs degrading the accuracy
Solution Approach 1:
The injection process uses periodic action with distinct injection phases followed by pause phases. Tracer tag fluids are injected in discrete pulses rather than continuously, with pauses between injections to allow previous fluids to clear the wellbore. This periodic injection pattern prevents mixing between different tracer tag fluids while ensuring complete depth coverage over time.
Solution Approach 2:
A buffer fluid is introduced as an intermediary substance between different tracer tag fluid injections. The buffer fluid acts as a separator that prevents direct contact and mixing between tracer tag fluids from different depth intervals. This intermediary approach maintains the compositional integrity of each tracer tag fluid while achieving continuous depth coverage.
3Length of stationary object
If the injection duration is extended to cover deeper intervals, then more depth is tagged, but the tracer tag fluids have more time to mix in the wellbore
Solution Approach 1:
The injection parameters are dynamically adjusted based on the depth interval being tagged. For longer depth intervals, the system increases injection duration and may adjust concentrations to maintain detectability. For shorter intervals, injection time is reduced to minimize mixing. This dynamic adaptation allows optimal tagging for varying depth requirements while preserving accuracy.
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 method improves the direct petro-physical characterization of wellbore cuttings, enhances mud logging correlation, and reduces inaccuracies in depth determination and labeling practices, thereby increasing the effectiveness of oil and gas extraction.
Implementation Method 1
Each of the respective synthesized polymeric nanoparticles are configured to undergo a thermal de-polymerization at a respective temperature. The thermal de-polymerization of the respective synthesized polymeric nanoparticles generates a respective mass spectra.
Implementation Method 2
Each of the respective synthesized polymeric nanoparticles are configured bind to a respective wellbore cutting.
Data Source
AI summary
A method and a system for injecting multiple tracer tag fluids into the wellbore are described. The method includes determining multiple injection concentrations of multiple respective tracer tag fluids, determining an injection sequence of the tracer tag fluids into a wellbore, and injecting the tracer tag fluids into the wellbore according to the injection concentrations and the injection sequence. The tracer tag fluids include synthesized polymeric nanoparticles suspended in a solution. The synthesized polymeric nanoparticles are configured bind to a wellbore cutting. The synthesized polymeric nanoparticles are configured to undergo a thermal de-polymerization at a respective temperature and generate a unique mass spectra. The injection sequence includes an injection duration determined by a depth interval of the wellbore to be tagged by the synthesized polymeric nanoparticles and an injection pause to prevent mixing the multiple tracer tag fluids in the wellbore.