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Updates and Bug fixes from PVTsim 18 to 19

New Options/Models

PVT simulation options extended with Equilibrium Contact experiment.

Updates and Bug Fixes

General

Tested on Windows Server 2008 and Windows 7 and installation guide updated.
CSP viscosity model improved for P > 1000 bar.
No longer possible to import fld-type databases (format used until version 13).
API correlation for interfacial tension between hydrocarbon and water replaced by Firoozabadi and Ramey (1988).
5 mercaptanes added to the pure component database

Methyl-mercaptane
Ethyl-mercaptane
Methyl-ethyl-sulfide
Di-Methyl -sulfide
Di-Ethyl-sulfide

Fluid Management

When characterizing multiple fluids to the same pseudo-components (Viscosity Tuning and Same Pseudos options) a master fluid composition is saved in addition to the individual fluids. The master fluid is a complete list of components contained in all fluids in question. Dummy mole%'s of 1.E-10 are assigned to the components in the master fluid. A master fluid is required input to Flowasta when simulating a pipeline set-up with a source fluid containing components not present in the inlet composition.
The coefficients (D, E and F) in the non-Newtonian wax viscosity model saved with the fluid and displayed under "Lumping/Corr. Fac" accessed from Current Char Fluid menu.
Legends with components names added to compositional QC plots.
N2 is taken out of QC K-factor evaluation, the reason being that sample cylinders may be contaminated by N2. Correlation coefficient (R2) requirement increased from 0.85 to 0.98.
In QC reported Plus component mole% was not calculated correctly for compositions in weight%, if molecular weights entered to a lower carbon number than the component weight%'s. Plus component mole% is used in evaluation number 5 of the QC module.
Improved check for legal plus molecular weights in Plus Fluid characterization.
Mix option extended to handle T-dependent interaction parameters

PVT & Regression

Option for continuous bleed off of gas in last stage of differential depletion experiment (to better match lab experiment).
Multiple Contact Experiment output revised to agree with format used in PVT reports.
Depth gradient regression option enhanced to provide a better match of observed compositional variation with depth.
Recoveries added as primary output on separate tab in Slim Tube output.
Default number of cells in slimtube experiment increased to 200. Default number of time steps increased to 400. Max number of time steps increased to 20000.
Output of key tie-line compositions under Additional Info in MMP output.
Improved numerical robustness of MMP-algorithm.
Saturation point option by mistake only allowed one saturation point to be calculated at a time.
Regression to PVT data modified to count entered critical temperature as data point.

Flash & Unit Operations

PH, PS and VT flash specifications extended to handle pure components.
Compressor and valve options extended to handle pure components.

Flow Assurance

H2O-MEG and MEG-CaCl2 interaction parameters reestimated to match recent hydrate depression data.
By mistake simulated asphaltene onset pressures not shown after tuning to experimental asphaltene onset pressures.
Option for tuning asphaltene amount to experimental asphaltene onset pressure corrected to work properly.
Upgrade from OLGAS 4.13.1 to OLGAS 6.2.1 for use with DepoWax.

Open Structure

PH, PS and VT flash specifications extended to handle pure components.

Interface Options

Eclipse Compositional

Number of characters limited to 8 in output of CNAMES keyword to comply with Eclipse input specification.

OLGA (table based)

Standard conditions fixed to match OLGA standard.
Standard temperature and standard pressure automatically inserted in P&T grid if standard temperature or pressure within PT grid boundaries.
IntelliGrid with a Grid factor of 5 is made default.
Minimum pressure limit lowered to 0.001 bara. Limit of 0.01 bara maintained for fluids with salts.
Warning displayed if oil density is higher than water density. May be the case for degassed heavy oils.
Improved accuracy of properties of hydrate inhibitors for T < 243.15 K.
Phase property extrapolation procedure improved for temperatures with two dew points.
For fluids with a 3-phase area at a low temperature the IntelliGrid option might not work properly, causing generation of an equidistant table rather than a table with a denser grid inside the phase envelope.

OLGA Compositional Tracking

Local tuning facilities removed from OLGA Compositional Tracking interface.

OLGA Wax

OLGA Wax Table generation might crash or hang with SRK-Peneloux(T) or PR-Peneloux(T) selected.

Prosper/Mbal Black Oil

All saturation points in Prosper interface file were by mistake for standard temperature.
The Gas Gravity written to the Prosper interface file changed to be gas from a single stage flash or separation of the reservoir fluid to standard conditions. Previously it was Gas Gravity of gas from single stage flash to standard conditions or separation on the equilibrium gas at the saturation pressure at the lowest temperature in the table.

Prosper EOS

Composition shown with more digits in Prosper-EoS interface file.

Saphir

Saphir interface extended. It was previously bound to always output average gas and liquid properties. A new selection permits gas phase properties to be output not considering a possible liquid phase.
Error message shown if fluid at any P&T consists of 100% liquid. Was previously interpreted as 100% gas.

WePS

Extended to allow up to 150x150 points.

Updates and Bug fixes from PVTsim 18.0 to 18.1

Options/Models

Asphaltene

Error corrected in option for tuning asphaltene amount to asphaltene onset pressure.

Depth gradient regression

Changed logic to enhance match of observed compositional variation with depth.

Differential liberation

Stage to atmospheric pressure may optionally be simulated as a continuous bleed off of gas.

Flash

PH, PS and VT flash specifications extended to handle pure components.

Multi Contact experiment

Column added to output identifying saturation point as either a bubble point or a dew point.

OLGA table interface

Intelligrid with a Grid factor of 5 made default. This means a tighter TP-grid at conditions with two hydrocarbon phases than at conditions with only one hydrocarbon phase.
Continuity problems cured in OLGA table for mixtures with two dew point temperatures.
Robustness of table generation improved for mixtures with salts for low T and low P.

Prosper EoS

Composition shown with more digits in Prosper EoS interface file.

QC module

K-factor, Hoffmann and Mass Balance Closure plots extended with legends with component names.
N2 taken out of K-factor evaluation in QC module as sample cylinder may be "contaminated" by N2. After this change correlation coefficient of K-factor plot must be > 0.98 to pass QC.

Regression

Critical temperature by mistake not counted as data point.
Data points and compositions of zero weight by mistake added to number of data points.

Saturation point option

Extended to allow calculation of more than one saturation point at the time.
Enhanced numerical robustness of saturation point algorithm.

Saphir interface

A new selection permits the user to distinguish between i) average gas and liquid properties or ii) only gas properties.

Slimtube

Max. number of time steps increased from 2000 to 20000.

Unit Operations

Compressor and valve options extended to handle pure components.

General

Interfacial tension

Correlation for interfacial tension between hydrocarbon and water modified from API correlation to that of Firoozabadi and Ramey (1988). Only DepoWax still uses API correlation.

Updates and Bug fixes from PVTsim 17 to 18

Options/Models

PC-SAFT asphaltene model available to JIP sponsors as alternative to SRK/PR.

Updates and Bug Fixes

General

Support for 64 bit Windows.
FLEXlm license system upgraded to version 11.5 to have Open Structure applications run from Excel under Vista.
Improved water densities from Water Package for pressure higher than 1000 atm and temperatures of 0-50 °C.
New parameters for propylene glycol to give improved hydrate inhibitor predictions.
MEG Peneloux volume shift parameter updated to give improved densities of fluid with MEG.
Salt CP-coefficients revised to give improved energy properties of salt water.
Recombination failed for Plus/No Plus fluids with defined C5-C6 components other than iC5, nC5 in case the fluids further contained an nC6 component with no density specified.
Improved smoothing of CSP viscosity in region between classical CSP and heavy oil viscosity model.
Error corrected in correlations for solubility of salts with crystal water. Solubility of salts with no crystal water corrected to not be influenced by crystal water bound to other salts.
Various minor changes and updates in pure component parameters.
Warning displayed when changing default number of pseudo-components in Unit System & Settings.

Fluid Management

QC module extended with check for consistent closing and opening pressures.
Updated text message in QC module on how to "cure" a fluid composition having a simulated separator pressure being larger than reported separator pressure.
QC module updated to fail unrealistic GC-compositions.
Error corrected in Same Pseudos option for Plus-fluids with only defined C7, C8 and/or C9 components. The error lead to incorrect component mole%'s.
Weaving and Save Phase options corrected to handle asphaltene components correctly.
Mix option corrected to properly handle mixing of fluids with components of the same name but different properties.

PVT & Regression

MMP algorithm enhanced (especially for CO2 injection gas). More informative error text message in case of failure.
Enhanced numerical robustness of option for regressing to MMP.
Max. number of cells in Slimtube option increased to 2000. Output frequency introduced for time steps and cell numbers.
Enhanced numerical stability of saturation point option.
Regression option modified to run on Vista.
An extra datapoint was erroneously added when plotting Vrel for CME after regression.
Bug corrected in Regression option for characterized fluids. Lumping specification not always carried properly through to regression.
Plus fluid regression option modified to allow viscosity model parameters as the only tuning parameters.
Improved numerical robustness when tuning to swelling data.
Plus fluid regression erroneously changed the Peneloux parameter of CO2.
Drive type (Forward or Reverse) specification not visible for set number 5 of Multi Contact Experiment.
Saturation point option did not work for more than 1 saturation point.
Gas/oil mix ratio for Reverse Multi Contact Experiment changed to be per amount of initial oil and not amount of oil at actual stage.

Flash & Unit Operations

Improved T-dependence of H2S dissociation constant for temperatures above 70 °C.
Numerical robustness of water phase envelope algorithm option enhanced for systems with two hydrocarbon liquid phases.
Energy properties and density derivates of salt water were incorrect when calculated using Property Generator and Water Package.
Unit Operations options by mistake returned C10+ molecular weights of zero.

Flow Assurance

Hydrate H was not counted when making average energy properties.
Error corrected in Hydrate Minimum Inhibitor Option. The error appeared for mixtures with salts when more than one set of pressure-temperature values specified.
DepoWax extended with Mukherjee&Brill pressure drop model.
Bug corrected in DepoWax to enable simulation of pipes with identical inlet and ambient temperatures.
DepoWax extended to always calculate film thickness, not only in sections with wax depositing.
Hinner correlations updated in DepoWax to not include length dependent terms (these are only relevant for very short pipes with significant boundary effects).
Error corrected in DepoWax for T-derivative of the density. Marginal influence on T-profile
Unit for dP/dL corrected in DepoWax
Errors corrected in DepoWax for average viscosity of oil and water and for surface tension of gas-liquid (when water present).
Corrected made in DepoWax in calculation of heat transfer using Petukov-ESDU correlation.
Error corrected in DepoWax causing same simulation results after all time steps.
Error in thickness of laminar film corrected in DepoWax. Caused too much wax deposition.
Time step control implemented in DepoWax causing wax build-up to be almost independent of time step length.
Default Hinner correlation in DepoWax changed from Petukov-ESDU to Sieder-Tate, as the former is discontinuous in Reynold's number.
PC-SAFT available as asphaltene model for JIP sponsors as alternative to SRK/PR.

Open Structure

Open Structure Flash extended with option for calculating water properties from water package.
Error corrected in Open Structure Flash in option for specifying phase type of single-phase fluid.
PS-flash could not be run in Open Structure Flash.
In the Open Structure Fluid Utility schema validation made more liberal to allow reading XML-fluids of other versions than the current one. This ensures better version compatibility of UniSim cases setup using the Calsep PVTsim Engine.
Open Structure DataLayer now distinguishes between a database open by another user and a file, which has a not recognizable database format.

Interface Options

Eclipse Black Oil

Eclipse Black Oil interface updated with option to enforce monotony in properties.
Eclipse Black Oil interface updated to give Rs versus depth values consistent with Rs in the PVTO table also when separator train specified.
Bug corrected in Eclipse Black Oil table for keyword PVTG. The bug sometimes caused lack of gas properties at pressures above dew-point pressure.

Hysys

Component densities transferred to Hysys changed from being input densities to be densities calculated using Peneloux volume corrected EoS.

OLGA

Error values now always bolded in the Olga.
IntelliGrid option in Olga interface updated to work correctly for fluids containing aqueous components.
Writing of lines with PBUBO and PDEWO and corresponding temperatures fixed not to end with "," if the values following the "," are less than 0. The "," causes problems for the Olga plotting tool when reading the lines.
Numerical robustness of OLGA interface improved.

OLGA Wax

Improved numerical robustness of OLGA Wax Table generation.
Component names were missing in the OLGA Wax table for components with no blanks among first 10 characters of the component name.
Incorrect cloud point temperatures in OLGA Wax table if Number of P-points > Number of T-points.
Table generation failed fluids containing pseudo-components with zero wax contact.

Prosper/Mbal Black Oil

For temperatures with two saturation pressures the saturation pressure written to the Prosper/Mbal interface table was the lower one. Changed to be the higher one.

Updates and Bug fixes from PVTsim 17.2 to 17.3

Error corrected in saturation point logic that might cause failure of regression when including swelling data.
Limit on number of cells in slimtube option increased to 2000. Time step and cell output frequency introduced.
Tabulated saturation pressure in Prosper/Mbal interface changed to always be the higher one (relevant for temperature tabulation points with two saturation point pressures).
Plus regression erroneously changed the Peneloux parameter of CO2 marginally. This caused problems e.g. in MMP simulations with a CO2 "No Plus" fluid as injection gas.
Error corrected in DepoWax causing the simulation results to be the same after all time steps.
The Save Phase option erroneously assigned asphaltene components an asphaltene fraction of 0.0. Corrected to be 1.0.
Error corrected in weaving option for asphaltene components.
Too low a thickness of laminar film layer in DepoWax caused too much wax deposition

Updates and Bug Fixes in PVTsim from 17.1 to 17.2

Numerical robustness of MMP algorithm improved for CO2 as injection gas. More informative error message in case of failure.
Bug corrected in Eclipse Black Oil table generation for keyword PVTG. Bug seen for undersaturated properties tabulated at input pressure stages and "const comp extrapol". No gas properties generated for P > dewpoint pressure.
Component names missing in OLGA Wax table for components with no blanks among first 10 characters of component name.
Bug corrected in Same Pseudos option causing incorrect component mole%'s for Plus-fluids with only defined C7, C8 and/or C9 components.
Unrealistic GC-compositions might cause crash in QC mud-contamination check.
Check implemented for license file location in Registry on Vista.
Bug corrected in DepoWax for surface tension of gas-liquid, when water present.
Correction in calculation of heat transfer in DepoWax for Petukov-ESDU correlation.
Incorrect cloud point temperatures in OLGA Wax table if Number of P-points > Number of T-points.

Updates and Bug Fixes in PVTsim from 17.0 to 17.1

Component densities transferred via Hysys interface changed from input densities to be densities calculated with Peneloux corrected EoS.
Hydrate code corrected to also account for Hydrate H in average energy properties.
Saturation point option changed to work for more than 1 saturation point at the time.
Intelligrid option in OLGA interface changed to work correctly also for fluids containing aqueous components.
Numerical robustness of OLGA saturation point algorithm improved for narrow boiling mixtures.
Section length term 'turned off' in correlations used to calculate Hinner as the term is only relevant for very short pipes.
Changed Schema validation in Open Structure modules to keep consistency UniSim design.
Error corrected in lumping. It appeared when regressing on already characterized fluids and regression option accessed from component input menu.
Enhanced smoothing of CSP viscosity in region between classical CSP and heavy oil viscosity model.
Water properties from water package available as an option in Flash Open Structure.
Error corrected in Property Generator for density derivatives of salt water.
Warning about unavailable database changed to distinguish between "database open by other user" and "database format not recognized".
FLEXlm software license system updated to version 11.5 to have Open Structure applications run from Excel under Vista.
Error corrected in correlations for solubility of salts with crystal water.
Inaccurate minimum inhibitor requirements in Hydrate module if more than one P&T set specified and water phase contains salt.
Improved accuracy water densities from water package for pressures > 1000 bar/14700 psia.

Updates & Bug Fixes

December 7th, 2009PVTsim 19.0 released