(88f) Integrated Equation of State Modelling for Flow Assurance
AIChE Spring Meeting and Global Congress on Process Safety
2012
2012 Spring Meeting & 8th Global Congress on Process Safety
1st International Conference on Upstream Engineering and Flow Assurance
Equation of State Applications in Upstream Engineering
Tuesday, April 3, 2012 - 4:30pm to 5:00pm
The challenges of modelling phase behaviour for flow assurance applications involve not only gas, oil and aqueous phases but must also encompass a variety of solid phases including hydrates, waxes and asphaltenes. We describe an integrated approach to the modelling process that is based on an industry-standard equation of state with a number of well-established modifications. The same underlying petroleum fluid characterisation procedure is used to generate compositional models that can describe all the fluid and solid phases for flow assurance applications. The particular characteristics of aqueous phases, electrolytes, dissolved wax and asphaltenes are handled by a series of add-on models that extend the basic equation of state. Each solid phase has its own dedicated model that is based on clear physical principles.
We present examples of complex phase behaviour calculations involving multiple phases including hydrates, waxes and asphaltenes and show how the different solids interact.
Although a sound description of the phase behaviour is fundamental for flow assurance, modelling the fate of precipitated solids is also important. We briefly describe our wax deposition model and demonstrate how the thermodynamic model impacts on deposition calculations.
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