PVT Lab

MODULES

BASE

OBM CLEANING

QUALITY CHECK (QC)

PVT SIMULATION & REGRESSION

PROPERTY GENERATOR

INTERFACES

OLGA

LEDAFLOW

The PVT Lab package is configured to provide the simulation functionality required to design and quality check PVT data and to develop EoS models that match the data.

The package supports fluid characterization, PVT simulation and regression to both routine and EOR PVT data. The experimental data can be QC’ed to ensure the data is of good quality before proceeding with the EoS modeling. Contaminated fluids can be cleaned and modeled, and common EoS models for up to 100 fluid compositions can be generated.

Modules | PVT Lab

BASE

The BASE module is the gateway to PVTsim’s diverse capabilities for simulating reservoir fluid behavior from reservoir to refinery. Compositional analyses and PVT data from a PVT report are easily entered into and stored in a PVTsim database.

Important features in the Base module include:

• Extensive pure component library
• Input of GC and TBP compositions
• Normal and heavy oil characterization
• CSP and LBC viscosity models
• Flexible component lumping and preset lumping schemes
• Recombination of separator oil & gas
• Mixing or weaving of up to 100 different fluids
• 2 phase flash and phase envelope simulations

PVTsim may be used with the industry standard SRK or PR equations (76 or 78 modification) in their original form or volume corrected. The GERG-2008 ensures accurate results for natural gases. More complex heavy oil phase equilibria can be handled using PC-SAFT equation.

OBM CLEANING

PVTsim’s module for numerical cleaning of reservoir fluid samples contaminated with oil-based drilling mud (OBM) often makes it possible to use a mud-contaminated sample in EoS modeling and thus save the operator from the expense and time it will require to take a new sample. The module includes an estimate function to find the composition of OBM contaminate and the wt% contamination when such data is not available. Contaminated measured PVT data can be input, simulated, and used in regression. The result is an EoS model for a cleaned reservoir fluid composition that can be used in simulation studies.

The reliability of the results obtained in PVTsim depends on the quality of input fluid data. The QC module is used to ensure input fluid data of good quality before proceeding with EoS modeling. A number of quality checks of the fluid data are made, including GOR/density evaluation, single-phase sample check, OBM contamination, thermodynamic equilibrium and mass balance checks of separator samples.

The results of the QC evaluations are reported in an easy-to-read Word report which includes plots and evaluation results. The report also lists possible reasons an evaluation failed.

PROPERTY GENERATOR

The property generator is a tool for generating fluid property tables in a pressure and temperature grid. The tables can be used to get an overview of how selected properties develop with pressure or temperature. The options for customizing output also make the module suited for fluid property input to software that does not have a dedicated interface available in PVTsim. The modules considers up to three phases (gas, oil and water).

PVT SIMULATION AND REGRESSION

The PVT Simulation & Regression module provides simulation and regression options for the below PVT experiments

–          Saturation Point
–          Constant Mass Expansion
–          Constant Volume Depletion
–          Differential Liberation
–          Separator Test
–          Viscosity Experiment.
–          Swelling^*1)
–          Slimtube/MMP^*1)
–          Equilibrium and Multi Contact^*1)

Up to 5 PVT experiments of each type can be stored with a fluid in the database. Regression options include Plus Regression and Characterized Regression. In the Plus Regression option PVTsim assists the user with suggested tuning parameters. Use the Compare with Data option to get an overview of the match of all experimental data for a fluid.

In the configuration delivered with the Reservoir Package, the module also includes powerful common EoS modeling features with regression to PVT data for up to 100 different fluids. The Multi Fluid Compare with Data option enables an easy comparison of simulated and experimental data for all fluids included in a Common EoS model.

^*1) Not included in the Basic PVT Package

Compare each module

Understanding what each module can do will make it easier for you to choose the right package

Modules Specification