Fluid Characterization of Three-Phase CO2/Oil Mixtures

1992 ◽  
Author(s):  
S.A. Khan ◽  
G.A. Pope ◽  
Kamy Sepehrnoori
Keyword(s):  
Three Phase ◽  
Oil Mixtures ◽  
Fluid Characterization

A New Algorithm for Multiphase-Fluid Characterization for Solvent Injection

SPE Journal ◽  
2016 ◽  
Vol 21 (05) ◽  
pp. 1688-1704 ◽  
Author(s):  
Ashutosh Kumar ◽  
Ryosuke Okuno
Keyword(s):  
Saturation Pressure ◽  
Binary Interaction ◽  
Liquid Density ◽  
Two Phase ◽  
Solvent Injection ◽  
Three Phase ◽  
Fluid Characterization ◽  
Multiphase Behavior ◽  
Three Phases

Summary Compositional simulation of solvent injection requires reliable characterization of reservoir fluids by use of an equation of state (EOS). Under the uncertainty associated with nonidentifiable components, reservoir fluids are conventionally characterized in the absence of universal methodology. This is true even for relatively simple fluids involving only the gaseous (V) and oleic (L1) phases. No systematic method has been presented for characterization of more-complex fluids, exhibiting three hydrocarbon phases: the V, L1, and solvent-rich-liquid (L2) phases. This paper presents a new algorithm for systematic characterization of multiphase behavior for solvent-injection simulation. The reliability of the method comes mainly from the binary-interaction parameters (BIPs) newly developed for the Peng-Robinson (PR) (Peng and Robinson 1976, 1978) EOS to represent three-phase behavior, including upper critical endpoints, for n-alkane and carbon dioxide (CO2)/n-alkane binaries. The regression part in fluid characterization broadly follows the concept of perturbation from n-alkanes, which was successfully applied for simpler two-phase fluids in our prior research. The algorithm, in its simplest form, uses only the saturation pressure and liquid density at a given composition and reservoir temperature. Case studies are presented to demonstrate the reliability of the algorithm for 90 reservoir fluids and their mixtures with solvents. Predictions are compared with experimental data for up to three phases. Results show that the simple algorithm developed in this research enables the PR-EOS to predict multiphase behavior in spite of the limited data used in the regression. Without the use of the BIPs developed in this research, the PR-EOS may fail to predict three phases, or may provide erroneous three-phase predictions.

scholarly journals Numerical Modal Analysis of Vibrations in a Three-Phase Linear Switched Reluctance Actuator

2017 ◽  
Vol 2017 ◽  
pp. 1-18
Author(s):  
José Salvado ◽  
Maria do Rosário Calado ◽  
António Espírito Santo ◽  
Anna Guerman
Keyword(s):  
Control Strategies ◽  
Mode Shapes ◽  
Audio Signals ◽  
Structural Vibrations ◽  
Significant Information ◽  
Switched Reluctance ◽  
Three Phase ◽  
Linear Configuration ◽  
Analytical Approaches

This paper addresses the problem of vibrations produced by switched reluctance actuators, focusing on the linear configuration of this type of machines, aiming at its characterization regarding the structural vibrations. The complexity of the mechanical system and the number of parts used put serious restrictions on the effectiveness of analytical approaches. We build the 3D model of the actuator and use finite element method (FEM) to find its natural frequencies. The focus is on frequencies within the range up to nearly 1.2 kHz which is considered relevant, based on preliminary simulations and experiments. Spectral analysis results of audio signals from experimental modal excitation are also shown and discussed. The obtained data support the characterization of the linear actuator regarding the excited modes, its vibration frequencies, and mode shapes, with high potential of excitation due to the regular operation regimes of the machine. The results reveal abundant modes and harmonics and the symmetry characteristics of the actuator, showing that the vibration modes can be excited for different configurations of the actuator. The identification of the most critical modes is of great significance for the actuator’s control strategies. This analysis also provides significant information to adopt solutions to reduce the vibrations at the design.

scholarly journals Thermal-fluid characterization of alternative liquids of power transformers: A numerical approach

2015 ◽  
Vol 22 (5) ◽  
pp. 2522-2529 ◽  
Author(s):  
Ramon Lecuna ◽  
Fernando Delgado ◽  
Alfredo Ortiz ◽  
Pablo B. Castro ◽  
Inmaculada Fernandez ◽  
...  
Keyword(s):  
Numerical Approach ◽  
Power Transformers ◽  
Fluid Characterization
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