Variable Volume System Calibration for Downhole Fluid Analysis
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Solution Overview
Problem
Existing systems for measuring fluid properties and phase behavior in the oil and gas industry, particularly downhole tools, often provide inaccurate results due to poor calibration, which can lead to unreliable decision-making in operations.
Innovation Solution
A method and system that calibrate parameters by filling a variable volume container with a reference fluid, altering its temperature or pressure, and comparing measurements to known properties to determine calibration functions, thereby improving the accuracy of fluid property and phase behavior measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If downhole tools and sensors are used for making measurements of pressure-volume data to derive fluid properties and phase behavior, then the opportunity to record data downhole in reservoir conditions is provided, but the accuracy of fluid properties and phase behavior is frequently poor compared to laboratory testing
Solution Approach 1:
The system performs preliminary calibration actions by filling the variable volume container with a reference fluid having known properties, altering temperature or pressure, and recording measurements before actual downhole measurements are taken. This preliminary calibration establishes baseline accuracy and enables correction factors to be applied to subsequent measurements, thereby improving measurement precision while maintaining downhole reliability
Solution Approach 2:
The system implements feedback by comparing recorded measurements against known properties of the reference fluid, identifying discrepancies, and using this information to校准 system parameters. This feedback loop continuously improves measurement accuracy by correcting systematic errors, ensuring that downhole measurements remain reliable and precise
2Measurement precision
If calibration checks are performed using known reference fluids and comparison to known properties, then the accuracy of measurements is improved, but additional time and procedural steps are required
Solution Approach 1:
The system achieves universality by using a single variable volume container that can serve multiple functions: it can hold reference fluids for calibration, hold actual fluid samples for measurement, and withstand downhole pressure and temperature conditions. This multi-functionality eliminates the need for separate calibration equipment, reducing calibration time while maintaining measurement accuracy
Solution Approach 2:
The system utilizes parameter changes by altering temperature or pressure of the reference fluid during calibration to match downhole conditions. By calibrating at varying parameters that simulate actual operating conditions, the system achieves accurate measurements without requiring extensive calibration at every possible condition, thus reducing overall calibration time while maintaining precision
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 approach enhances the accuracy of fluid property and phase behavior measurements in situ, allowing for more reliable data collection and decision-making in the oil and gas industry by calibrating system parameters based on known reference fluids.
Implementation Method 1
altering at least one of a temperature or a pressure of the reference fluid
Implementation Method 2
altering at least one of a temperature or a pressure of the reference fluid
Implementation Method 3
a measurement component that records a first set of measurements of the reference fluid while the at least one of the temperature or the pressure of the reference fluid is altered
Data Source
AI summary
Variable volume systems and methods of use thereof described herein are capable of making calibrated determinations of fluid properties and phase behavior of a fluid sample. The determinations can be calibrated based on one or more calibration functions, such as system volume corrected for pressure and temperature variations. Cross-checking the results of measurements can be used to determine accuracy of the calibration or monitor for leaks or other anomalies of the variable volume systems. The variable volume systems can be implemented in a well logging tool and are capable of being calibrated downhole.