Downhole Pressure Noise Characterization via Bubble Point Valve Isolation
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Solution Overview
Problem
Current methods for denoising pressure measurements during downhole pressure testing operations are limited, as they rely on mathematical equations that do not quantify the nature and source of noise, leading to unreliable measurements.
Innovation Solution
The system employs a fluid sampling and pressure testing tool with probe and tool pressure sensors, utilizing a bubble point valve to isolate noise sources, allowing for the distinction between common system noise, operational noise, and formation-related noise through controlled pressure measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pumps are running during pressure testing operations, then productivity is improved, but noise in pressure measurements increases
Solution Approach 1:
The system segments noise sources into three distinct categories by using multiple pressure sensors positioned at different locations (probe pressure sensor and tool pressure sensor) and analyzing pressure fluctuations during different operational phases. This segmentation allows identification of common system noise, operational noise, and formation-related noise, enabling targeted mitigation while maintaining pump operation for productivity.
Solution Approach 2:
The patent introduces an intermediary analysis layer that processes pressure measurements to separate and characterize different noise sources. By using the bubble point valve to isolate the probe fluid passageway and comparing readings from multiple sensors, the system acts as an intermediary between the noisy operational environment and the final pressure measurements, enabling reliable data extraction despite pump-induced noise.
2Measurement precision
If mathematical denoising equations are applied, then noise reduction is attempted, but the nature and source of noise remain unquantified
Solution Approach 1:
The system implements feedback by continuously monitoring pressure fluctuations and using this information to characterize noise sources. The bubble point valve provides a mechanism to isolate and compare pressure readings, creating a feedback loop that enables identification of whether noise originates from the system, operations, or formation. This feedback mechanism preserves noise source information while improving measurement accuracy.
Solution Approach 2:
The patent changes the parameter being measured from simple pressure values to pressure fluctuation characteristics and noise level parameters. By analyzing standard deviation, frequency content, and temporal patterns of pressure readings, the system transforms raw pressure data into diagnostic information about noise sources, maintaining measurement precision while preventing loss of noise characterization data.
3Reliability
If multiple pressure sensors and valve operations are used to characterize noise, then measurement reliability is improved, but device complexity increases
Solution Approach 1:
The system achieves multi-functionality by using the existing bubble point valve and pressure sensor infrastructure for dual purposes: traditional pressure testing operations and noise characterization. The same hardware components serve both operational and diagnostic functions, improving measurement reliability without proportionally increasing device complexity. The probe pressure sensor and tool pressure sensor are used for both pressure measurement and noise source identification.
Data Source
AI summary
Herein are described methods and systems for characterizing noise and noise level during downhole pressure testing and/or sampling operations. Methods and systems may identify and quantify the noise level of a formation pressure testing and/or sampling operations by measuring pressures with the probe pressure sensor and the tool pressure sensor with and without extension of the dual probe and closing the bubble point valve that connects the probe fluid passageway to the tool fluid passageway.