Vibrating Wire Sensor Viscosity Analysis Bandwidth Reduction
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Solution Overview
Problem
Current methods for determining fluid viscosity in wellbore formation evaluation face challenges due to high telemetry bandwidth requirements, which hinder real-time viscosity determination during drilling operations.
Innovation Solution
A two-step processing method where a downhole assembly computes resonant frequency and logarithmic decrement damping factor from vibrating wire sensor measurements, reducing bandwidth needs, and a surface assembly uses these parameters to estimate viscosity using a modeling equation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complete waveform data is transmitted from downhole to surface for viscosity analysis, then measurement precision is improved, but telemetry bandwidth requirements increase
Solution Approach 1:
The patent extracts and computes essential model parameters (resonant frequency, logarithmic decrement damping factor) from the complete waveform data at the downhole location. Only these extracted parameters are transmitted to the surface rather than the entire waveform dataset, thereby reducing telemetry bandwidth requirements while preserving the information necessary for accurate viscosity measurement.
Solution Approach 2:
The patent performs preliminary processing of the waveform data by computing the resonant frequency and damping factor at the downhole location before transmission. This preliminary action reduces the data volume that needs to be transmitted while ensuring that the critical parameters for viscosity calculation are already prepared and optimized.
2Loss of time
If complex waveform processing is performed downhole, then real-time viscosity determination is achieved, but device complexity increases
Solution Approach 1:
The patent segments the overall viscosity determination process into two distinct parts: (1) downhole computation of model parameters from waveform data, and (2) surface-based viscosity calculation using the transmitted parameters. This segmentation allows real-time processing to occur downhole while limiting the complexity to only the essential parameter extraction, with the more computationally intensive viscosity modeling performed at the surface.
Solution Approach 2:
The patent performs partial processing downhole by computing only the essential model parameters (resonant frequency and damping factor) rather than performing complete viscosity analysis. This partial action achieves real-time capability with reduced complexity, while allowing the remaining computational burden to be handled at the surface where resources are more abundant.
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 real-time determination of fluid viscosity during formation evaluation by reducing computational and bandwidth burdens on the downhole tool, facilitating efficient fluid characterization.
Implementation Method 1
a sensor to measure a waveform representative of a motion of a wire vibrating in a flow of a fluid
Implementation Method 2
a logarithmic decrement damping factor from the measured waveform
Data Source
AI summary
Example methods, apparatus and articles of manufacture to process measurements of wires vibrating in fluids are disclosed. A disclosed example apparatus includes a downhole assembly and a surface assembly. The downhole assembly including a sensor to measure a waveform representative of a motion of a wire vibrating within a fluid at a downhole location in a wellbore, a waveform modeler to compute a model parameter from the measured waveform, and a first telemetry module to transmit the computed model parameter to a surface location. The surface assembly including a second telemetry module to receive the computed model parameter from the downhole assembly, and a viscosity analyzer to estimate a viscosity of the fluid from the computed model parameter.