NMR Logging Tool Activation Set Switching
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Solution Overview
Problem
Nuclear magnetic resonance (NMR) logging tools face interruptions and increased operation times when switching activation sets due to the need to pause data acquisition and transmission, leading to incomplete datasets and inefficiencies in logging operations.
Innovation Solution
A system that allows continuous NMR data logging by detecting formation property changes and automatically switching activation sets without pausing tool string movement, using compression and decompression techniques to rapidly transmit new activation sets while maintaining data transmission and minimizing gaps in collected data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If NMR logging tool pauses data acquisition to switch activation sets, then correct timing sequences and measurement parameters are achieved, but operation time increases and data completeness decreases
Solution Approach 1:
The system pre-loads the next activation set into a buffer memory while the current activation set is still being used. This preliminary preparation allows the activation set switch to occur without pausing the logging operation, as the new configuration is already ready in memory. The buffer contains pre-compressed activation set data that can be rapidly decompressed and applied, eliminating the need to stop data acquisition during parameter changes.
Solution Approach 2:
The patent implements continuous data acquisition by decoupling the activation set switching from the data logging process. Multiple activation sets are maintained in buffer memory, allowing the NMR tool to switch between configurations without interrupting the continuous movement of the tool string through the formation. This ensures uninterrupted collection of formation data while adapting measurement parameters to changing formation properties.
2Adaptability or versatility
If NMR logging tool pauses to download new activation set, then correct parameters for new formation properties are obtained, but data gaps occur and relogging is required
Solution Approach 1:
Activation sets are pre-compressed and stored in buffer memory before they are needed. When formation property changes are detected, the appropriate pre-prepared activation set is already available in the buffer, eliminating the need to pause for downloads. This preliminary preparation ensures both adaptability to new formation conditions and continuity of data acquisition.
Solution Approach 2:
A buffer memory system acts as an intermediary between the surface control system and the NMR logging tool. This buffer stores multiple pre-compressed activation sets, allowing rapid switching without direct real-time communication during logging. The buffer mediates the transfer of configuration data, enabling smooth transitions that maintain data completeness while adapting to changing formation properties.
3Measurement precision
If tool string stops for activation set switching, then NMR parameters are reconfigured, but non-NMR tools also stop and report partial datasets
Solution Approach 1:
The system enables all logging tools (both NMR and non-NMR) to operate continuously by implementing buffer-based activation set switching. The NMR tool can reconfigure its parameters using pre-loaded buffer data without stopping, while non-NMR tools continue their measurements uninterrupted. This synchronized continuous operation ensures complete datasets from all tools and maximizes logging productivity.
Solution Approach 2:
The NMR logging tool autonomously manages its own parameter configuration by accessing activation sets stored in its internal buffer memory. This self-service capability eliminates the need for external intervention or pausing to receive new configuration data, allowing the tool to adapt its parameters on-the-fly while maintaining continuous operation alongside other logging tools.
Data Source
AI summary
An NMR logging system is disclosed which continues logging without interruption despite switching activation sets to adapt to changes in formation properties. Based on detection of an approaching or encountered geological boundary, an appropriate activation set is transmitted to the downhole NMR tool while the NMR tool continues logging. This system optimizes NMR data collection for each formation and associated formation fluid properties while reducing the need to stop the tool string movement while switching the activation set, and reduces incomplete collection of NMR and non-NMR logging tool data.