Hydrate and PVT prediction software

What is HydraFLASH?

HydraFLASH is Hydrafact’s gas hydrate and 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 over 25 years and has been developed by a variety of experts from fields such as Petroleum Engineering, Flow Assurance Engineering and Computer Science.

Why use HydraFLASH?

Comprehensive experimental facilities have allowed us to tune and validate the model using a vast, largely unpublished in-house hydrate and hydrocarbon equilibria database.

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

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.

There are currently a variety of options available for purchasing HydraFLASH so if you require a quotation or have any other questions simply get in touch with us.

If you are interested in a one month free trial of HydraFLASH then get in touch with us.