PVT and Flow Assurance prediction software

What is HydraFLASH?

HydraFLASH is Hydrafact’s thermodynamic prediction software designed to calculate the phase equilibria and physical properties of petroleum reservoir fluids (including: oil, gas, water, salt, alcohols, glycols, hydrates & ice) over a wide range of pressure and temperature conditions.

It was created through numerous industry & government-sponsored R&D projects by the Heriot-Watt Hydrate and Reservoir Fluids research groups and Hydrafact Limited over many years (since 1987) and has been developed by a variety of experts from fields such as Chemical/Petroleum Engineering, Flow Assurance Engineering and Computer Science.

In the past 10 years, we have added a strong database on PVT and Flow Assurance of Hydrocarbon and CO2, and H2 systems with around 15,000 data points.

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Why use HydraFLASH?

Comprehensive experimental facilities have allowed us to tune and validate the model using a vast, largely unpublished in-house flow assurance and PVT equilibria database.

As a result, HydraFLASH is the most accurate model available for predictions involving real-world production systems.

Watch Professor Bahman Tohidi Explain HydraFLASH's Advantages and Capabilities:

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The Model

Equation of State & Mixing Rules

A combination of equations of state (EoS) and appropriately selected mixing rules provide a powerful tool capable of modelling complicated multiphase, multicomponent systems. The SRK and PR EoS are commonly used for modelling in the oil and gas industry and are included in HydraFLASH in addition to the Peneloux density correction and different mixing rules.

HydraFLASH incorporates the Valderrama-Patel-Teja (VPT) EoS with non-density dependent mixing rules (NDD) used in modelling fluid phases. The combination has proved to be very effective for modelling systems with polar as well as non-polar components. The CPA (Cubic Plus Association) is a new approach that has a number of advantages when modelling fluid phase equilibria for systems containing components which can form hydrogen bonds (e.g. water, methanol, ethanol, MEG).

Hydrate Phase Modelling

The hydrate phase is modelled by the solid solution theory of Van der Waals and Platteeuw. The Kihara model for spherical molecules is applied in order to calculate the potential function for compounds forming the hydrate phases.

Electrolyte Solution Modelling

Electrolytes are modelled by an improved Aasberg-Petersen model. The model can be used over a wide range of temperature and salt concentrations, and is capable of handling mixed electrolyte solutions.

Technical Specifications

Continuously tested for real process scenarios with validation against in-house and literature experimental data.

Calculation options

For Hydrates

The HydraFLASH hydrate model can accurately predict the formation of hydrates and the inhibition effect and distribution of hydrate inhibitors in oil and gas systems. If the water contains salts, the influence of these salts on the hydrate formation conditions will also be taken into account.

HydraFLASH can accurately predict:

  • The most stable type of hydrate formation structure ( I, II and H)
  • If hydrates will form at a given temperature and pressure
  • The minimum inhibitor injection rate to prevent hydrates as a function of the water cut
  • The distribution of inhibitor in different phases
  • Maximum water content permissible before hydrate formation
  • The hydrate formation and inhibition effect of ethanol and i-propanol, n-propanol


New offers are available for a limited time.

Check out the various options for purchasing HydraFLASH 

If you require a quotation or would like to learn more about the offers at the moment, don’t hesitate to get in touch with us 

We can also answer enquiries related to an evaluation or a one month free trial of HydraFLASH