Downhole Vibration Data Recording via Dynamic Sampling
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Solution Overview
Problem
Current downhole drilling technologies face challenges in efficiently recording and storing vibration and impact data due to high storage requirements, especially in high-temperature environments, where conventional methods result in excessive data volume and inadequate storage capacity for long-term operations.
Innovation Solution
A downhole vibration and impact data recording method that employs multiple sampling rates and storage strategies, including analog-to-digital conversion, anti-aliasing filtering, and intermittent storage using high-temperature flash memory, to reduce data storage needs while maintaining data integrity for analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If continuous recording of original vibration data at fixed high sampling rate is performed, then data completeness and analysis capability are improved, but storage capacity requirements increase significantly
Solution Approach 1:
The patent segments the continuous high-rate vibration data into discrete impact events by detecting threshold exceedances. Only data containing impact information is recorded at high sampling rates, while intervals between impacts are recorded at lower rates or skipped entirely. This segmentation transforms continuous storage into event-triggered storage, dramatically reducing total data volume while preserving all impact characteristics.
Solution Approach 2:
The patent extracts and records only the essential impact characteristics (magnitude, duration, frequency) from the continuous vibration signal, rather than storing the entire raw signal. By extracting key features and storing them in a condensed format, the system maintains analytical capability while reducing storage requirements by orders of magnitude.
2Measurement precision
If high sampling rate data is continuously stored, then measurement precision is improved, but device complexity and storage requirements increase
Solution Approach 1:
The patent implements dynamic sampling rate adjustment based on vibration signal characteristics. The sampling rate automatically transitions between high-rate mode (during impacts) and low-rate mode (between impacts), allowing the system to maintain high measurement precision when needed while reducing overall data generation. This dynamic adaptation simplifies storage requirements without compromising detection capability.
Solution Approach 2:
The patent changes the sampling rate parameter dynamically based on the detected vibration state. When vibration amplitude exceeds a threshold indicating an impact event, the system switches to high sampling rate f1 for precise measurement. When vibration is below the threshold, it switches to low sampling rate f2, reducing data volume while maintaining adequate monitoring capability.
3Quantity of substance
If original impact data is not recorded but only analysis results are stored, then storage requirements are reduced, but impact characteristic analysis capability is lost
Solution Approach 1:
The patent introduces an intermediary processing stage that analyzes vibration data in real-time and identifies impact events. This intermediary layer extracts impact characteristics and triggers selective recording, serving as a bridge between raw data acquisition and final storage. The intermediary ensures that only relevant impact data is preserved in high detail, while maintaining the ability to perform comprehensive impact analysis.
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 effectively reduces data storage requirements by buffering high-rate data and storing low-rate data continuously, allowing for detailed analysis of vibration and impact characteristics, suitable for deep formation exploration under extreme conditions.
Implementation Method 1
performing an analog-to-digital conversion on analog data output from a sensor at a sampling rate f1, outputting digital format data obtained at the sampling rate f1
Implementation Method 2
storing the digital format data obtained at the sampling rate fn continuously into a storage module
Data Source
AI summary
Disclosed is a downhole vibration and impact data recording method, comprising: performing analog-to-digital conversion on analog data, outputting digital format data obtained at a sampling rate f1, and performing sampling storage processing and analysis storage processing on the same. The sampling storage processing includes outputting the digital format data obtained at a sampling rate fn through multiple samplings; storing the same continuously into a storage module. The analysis storage processing includes: buffering the digital format data obtained at the sampling rate f1 into a memory; analyzing the same to determine whether an impact event occurs, and if yes, storing the current data in the memory into the storage module, and then jumping back to the buffering step; otherwise, jumping directly back to the buffering step. With the above method, the amount of data storage can be effectively reduced, while the characteristics of the vibration and impact data can be analyzed.