• PVTsim 18 to 19

Updates and Bug Fixes

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.
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