Multiphase Hydrate Fraction Modeling Beyond Equilibrium Flash
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Solution Overview
Problem
Existing methods for thermodynamically calculating multiphase flash, such as vapor-liquid-liquid flash and hydrate flash, fail to accurately predict the hydrate fraction, composition, and structure formed at various pressure and temperature conditions as a path-dependent process during hydrate formation.
Innovation Solution
A method for multiphase hydrate fraction modeling that involves receiving initial feed composition and time series of pressure and temperature data to determine a non-equilibrium hydrate fraction using a computing device, performing multiphase isothermal hydrate flash, and updating the hydrate fraction until convergence is achieved, allowing for the prediction of phase components and hydrate structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If equilibrium multiphase hydrate flash is used to predict hydrate fraction, then the calculation can be performed using standard thermodynamic methods, but the prediction accuracy of hydrate fraction, composition, and structure is insufficient
Solution Approach 1:
The patent changes the fundamental parameter from equilibrium-based calculation to non-equilibrium-based calculation. By introducing a non-equilibrium hydrate fraction parameter that accounts for kinetic effects and path-dependency, the model can accurately predict hydrate fraction, composition, and structure formed during actual hydrate formation processes at various pressure and temperature conditions.
2Ease of manufacture
If standard thermodynamic calculation methods are used, then the calculation process is relatively simple, but the model cannot accurately capture path-dependent hydrate formation behavior
Solution Approach 1:
The patent introduces dynamic elements into the hydrate formation model by considering the path-dependent nature of hydrate formation. The non-equilibrium hydrate fraction calculation dynamically adjusts based on the specific pressure-temperature path taken during hydrate formation, capturing the kinetic behavior and temporal evolution of hydrate systems rather than assuming static equilibrium conditions.
3Adaptability or versatility
If equilibrium-based methods are used to model hydrate flash, then commercial software packages can be utilized, but the methods fail to predict non-equilibrium hydrate fraction during actual formation processes
Solution Approach 1:
The patent introduces an intermediary calculation layer that bridges equilibrium thermodynamic methods and non-equilibrium hydrate formation prediction. The non-equilibrium hydrate fraction serves as an intermediary parameter that incorporates kinetic effects and path-dependency into the calculation, allowing the model to use standard thermodynamic frameworks while accurately predicting non-equilibrium hydrate formation behavior.
Data Source
AI summary
Technologies for multiphase hydrate fraction modeling include devices and methods for receiving an initial feed composition of a constant volume cell and a time series of pressure data and temperature data for the cell during a test procedure. The devices and methods include determining a non-equilibrium hydrate fraction for the constant volume cell based on the time series of pressure data and temperature data, predicting one or more phase components of the constant volume cell based on the non-equilibrium hydrate fraction. The devices and methods may include displaying gas composition in the constant volume cell over the time series based on the prediction.