HYD-PREDIC

Vapor liquid equilibrium software
Vapor liquid equilibrium software
Vapor liquid equilibrium software

HYD-PREDIC : THE FLOW ASSURANCE SOFTWARE

flow assurance software / gas hydrate prediction software is used to predict formation of any hindrance like gas hydrates or wax in the flow of hydrocarbon mixtures like crude oil through a pipeline. More information regarding flow assurance can be gathered from flow assurance page.

Gas hydrates are inclusion compounds of low molecular weight gases like O2, H2, N2, CO2, CH4, H2S or inert gases like Ar, Kr or Xe with water. Some higher hydrocarbons like ethane, propane and butane and freons also form gas hydrates. One unit of gas hydrates consists of single molecules of these gases existing in a cage formed of water molecules. These gas hydrates are similar in structure to ice but unlike ice they are stable at temperatures higher than 0 o C (the freezing point of water) and at pressures above atmospheric pressure. Gas hydrates form in subsea pipelines due to presence of water and hydrate forming hydrocarbons and suitable pressure and temperature conditions resulting in blockage of pipeline leading to loss of production, time and manpower. Due to inherent properties of gas hydrates, the pipeline blockages due to hydrate formation are sometimes very difficult to remove resulting in huge monetary losses.

HYD-PREDIC is a flow assurance software / gas hydrate prediction software capable of predicting the exact section of pipeline prone to hydrate formation in a subsea multiphase crude oil pipeline. This prediction can result in enormous monetary saving as then the costly hydrate prevention measures can only be focussed on the section of pipeline prone to hydrate formation rather than the complete pipeline. Also HYD-PREDIC can be used to include the effect of insulation or design a suitable pipe-in-pipe heating system for a subsea pipeline to prevent hydrate formation in the pipeline.

HYD-PREDIC comprises of macros written for MS excel using Visual Basic for Applications (VBA) programming language. HYD-PREDIC can be applied to any subsea multiphase crude oil transfer pipeline that can be a vertical insulated or uninsulated pipeline section laid under the sea or an insulated or uninsulated vertical tubing connecting BOP at the seafloor to the oil collection vessel at sea level. The pipeline can contain a mixture of gas, oil and water with known reservoir temperature, known bubble point pressure of original crude oil coming out of reservoir and known weight percentage of produced water. The variation in relative percentages of oil and gas, and variation in various properties of oil and gas with pipe length has been calculated using various correlations available in literature for crudes of different parts of world like gulf of Mexico crudes, California crudes, North Sea crudes, Middle East crudes etc as per Black Oil Model. These values are further used to predict the section of pipeline prone to hydrate formation.

CALCULATION PROCEDURES FOR HYD-PREDIC

HYD-PREDIC uses standard chemical engineering equations to find the temperature and pressure profile within any vertical or inclined sub-sea pipeline through which multi-phase crude oil-gas-water mixture is flowing. Further it compares the temperature and pressure conditions existing in the pipeline to hydrates formation conditions considering the hydrate inhibition effect of salt present in the water phase of oil-gas-water mixture and finds out the section of pipeline prone to hydrate formation. HYD-PREDIC can take into account thermocline details in case of vertical pipeline subject to the availability of the information and the same being conveyed to us. In absence of thermocline details a linear temperature profile of seawater with depth is considered. HYD-PREDIC can include the effect of insulation to predict the temperature and pressure profile in the pipeline. Various properties of oil and gas are calculated using various correlations available in literature for crudes of different parts of world like gulf of Mexico crudes, California crudes, North Sea crudes, Middle East crudes etc as per Black Oil Model. The multi-phase flow through the pipeline is simulated for no slippage between liquid and gas phase using Darcy’s equation and for slippage between liquid and gas phase using Beggs and Brill correlations and Mukherjee and Brill correlations.

CALCULATION MODULES FOR HYD-PREDIC

1- Hydrate prediction in subsea multiphase crude oil pipeline with no slippage between liquid and gas phase or slippage between liquid and gas phase as per Beggs and Brill correlations or Mukherjee and Brill correlations.

Hydrate prediction curve data with tabulation of sea water temperature profile, pipeline temperature profile and hydrate equilibrium temperature with pipe length with indication for section of pipeline prone to hydrate formation.

Hydrate prediction curve showing sea water temperature, pipeline temperature and hydrate equilibrium temperature vs. pipe length.

Variation of relative wt. percentages of oil and gas and various properties of oil and gas like density, viscosity, specific heat, thermal conductivity and latent heat with pipe length.

Sample Result –

Hydrate prediction curve (no slippage) – Download

Hydrate prediction curve (slippage as per Beggs and Brill correlations)                                      – Download

Hydrate prediction curve (slippage as per Mukherjee and Brill correlations)                         – Download

Calculation cost: USD 200

PRACTICAL USES OF HYD-PREDIC

HYD-PREDIC is among very few softwares available in the field of flow assurance in the world. It can be used in vertical and inclined sub-sea pipelines through which multiphase crude oil-gas-water mixture is flowing.  HYD-PREDIC considers variation in relative weight percentages of oil and gas, and variation in various properties of oil and gas with pipe length using various correlations available in literature for crudes of different parts of world like gulf of Mexico crudes, California crudes, North Sea crudes, Middle East crudes etc. as per Black Oil Model. HYD-PREDIC can take into consideration the thermocline details of the sea for calculations involving vertical pipeline.The inclusion of thermocline details results in accurate prediction of section of pipeline prone to hydrate formation. As HYD-PREDIC can predict the exact section of pipeline prone to hydrate formation so its usage can result in immense monetary saving as the hydrate prevention measures can be focussed on the section of the pipeline prone to hydrate formation rather than the complete pipeline. Also HYD-PREDIC can be used to provide a suitable insulation or design pipe-in-pipe heating system for vertical pipelines to prevent hydrate formation in the pipeline. HYD-PREDIC can include slippage between liquid and gas phase as per Beggs and Brill correlations and Mukherjee and Brill correlations in its calculations.

COMPARATIVE ADVANTAGE OF HYD-PREDIC

1 – HYD-PREDIC is among very few flow assurance softwares in the world with similar capability. Other similar flow assurance softwares are extremely expensive whereas HYD-PREDIC can be used at a very low cost on per calculation basis.

2 – HYD-PREDIC is offered on software as a service (SAAS) model where ready results of the queries will be provided to the customer as a service. This way the customer would not have to arrange for infrastructure like a standalone high-end computer with suitable backend softwares programs for running and safeguarding the present software. Also the customer would not have to learn how to operate the software as ready results of the queries would be provided to him through e-mail. The only requirement for availing the services of HYD-PREDIC is a valid email address to send and receive queries for which any internet enabled computer can be used.

3 – As HYD-PREDIC can predict the exact section of pipeline prone to hydrate formation so its usage can result in immense monetary saving as the hydrate prevention measures can be focussed on the section of the pipeline prone to hydrate formation rather than the complete pipeline. Usage of HYD-PREDIC can result in electrical heaters to be applied only to the section of pipeline prone to hydrate formation rather than the complete length of pipeline thus resulting in monetary saving.

4 – Apart from predicting the section of multiphase crude pipeline prone to hydrate formation, HYD-PREDIC also calculates pressure drop along the pipeline and variation in relative percentages of oil and gas, and variation in various properties of oil and gas with pipe length using various correlations available in literature for crudes of different parts of world like gulf of Mexico crudes, California crudes, North Sea crudes, Middle East crudes etc. as per Black Oil Model. These properties can be used for various other crude oil calculations.

4 – HYD-PREDIC can be used to provide a suitable insulation or design suitable pipe-in-pipe heating system for vertical pipelines to prevent hydrate formation in the pipeline.

5 – HYD-PREDIC uses standard chemical engineering equations and choice of correlations applicable to crudes of different parts of world in its calculations so results obtained from HYD-PREDIC have strong theoretical basis and can be considered theoretically accurate.

Results of HYD-PREDIC flow assurance software / gas hydrate prediction software can be requested from VLE CALCULATOR page.