Previso Software Pty Ltd is an Australian software company servicing the Oil & Gas industry.Previso Software comprises technical professionals, numerical modellers and software developers.

Level 11, 216 St Georges Terrace Perth 6000 Western Australia

support@previso.net | www.previso.net

The Product

Multiple, sophisticated products can be defined, such as Domestic gas, LNG, LPG, condensate and CO2. Each product stream is given a demand profile; fields and wells are ranked and prioritised and automatically triggered to simultaneously meet all markets.

Market-Driven Solution

One software package that can model gas production from reservoir to market; a single platform solution that can communicate with 3rd party software where required.

Truly Integrated

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Previso is a compositional gas forecasting software that models thepressure dependency of the entire integrated extraction, productionand distribution system from multiple reservoirs, wells, subseapipelines, compressors, separators to the market. It does this in asingle package.

It’s major strength is that it performs the gas forecasting very quicklywhilst honouring multiple constraints on field and product priorities,ranking and production (or energy) targets.

Since it runs very fast, subsurface uncertainty quantification is nowpossible by generating vast numbers of scenarios required for short,medium and long-term production planning.

Robust and Extremely Fast Algorithm

Previso is specifically designed for gas planning and decision making. Since the solution is generated in minutes, not hours, many scenarios can be generated in a practical time frame, including full probabilistic analyses.

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Robust and Extremely Fast Algorithm

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The key strengths of the software are its stability and speed of calculation. We have designed and implemented a robust and extremely fast algorithm that does not make simplifications.

Complex production systems with many wells and reservoirs can be solved in minutes rather than hours. The software is completely integrated with no external interfaces with other software packages required. All aspects of the gathering system are modelled directly within PREVISO.

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Truly Integrated in 1 Software PackageType CurvesQpot vs Cum GasQpot vs TimeRank / Prioritise

Market-DrivenSpecify Product DemandSpecify Well TriggeringSpecify Availability

Exit NodesSpecify Fixed Pressure

Well NodesDefine IPRDefine VLPNodal AnalysisSet Constraints

P

Qg

VLPIPR

Reservoir Tanks:- Material Balance- History Matching- GIIP, P, Rel. Perm.- Gas Composition- CVD Tables- Aquifers

Product SplittingDefine Products (C1, … C6+)Gas SeparationDefine Fuel/Flare/Losses

Entry NodesSet ConstraintsRank / Prioritise

Pipelines- dP Correlations- dP Tables

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Components Modelled in Previso

Fluid Characterisation• Compositional (C1 … C7+, inerts)• Customised Fluid Components• Water of Condensation and Free Water Production• Compositional CVD and CME data entered• Correlations for Density, Viscosity and Z factor

Reservoir Modelling• Material Balance (history matching and forecasting)• Models Aquifers (analytical and physical)• Compositional Type Curves (imported from Eclipse)• Type Curve Scaling

Well-Bore Modelling• Reservoir Inflow Models (calculated or imported)• Vertical Lift Performance (calculated or imported)• Nodal Analysis Workflows

Pipeline Modelling• Built-in Correlations• Quadratic Equations, i.e. Pout - f(Q,Pin)• Look-up dP Tables• Calibration to measured data

Facility Modelling• Yield Tables• Extraction Methods (Composition, Recovery, ..)• Rate Constraints• Incorporates Availability / Down-time• Fuel & Flare & other losses

Compressor Modelling• Single / Parallel Compressors• Compressor Curves• Polytropic• User-defined Tables

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Market• Multiple Markets (gas, LNG, condensate, energy)• Ranking and Prioritising of Markets• Average, Peak and Seasonal Demand• Automatic Field Triggering to meet Demand

Scenario Management• Dedicated Tool to Set-up all Scenarios• All Scenarios are Created in a Single File• Deterministic (single variable or multi-variable)• Define Probabilistic Distributions on each Variable• Reporting and Plotting Dashboard & Templates• Seamless Exporting Interface with Excel

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Previso contains functionalities to model the reservoir and well performance in detail and calibrate these models with production data.

Due to its computational speed and stability, Previso can quickly forecast production from many hundreds/thousands of wells.Previso is typically used for the following applications

Field Development Planning• Define and Constrain the Forecast to Several, Individual Product Contract Profiles;• Test Many Development Scenarios;• Determine Well / Field / Compression Timing & Sequencing;• Test the Impact of all Major Uncertainties by Combining Many

Combinations of any Variable in the System;• Conduct ‘Directional’ Economics on all Development Scenarios;

Production Forecasting• Short – Medium – Long Term forecasting Capability;• Calibrate Reservoir, Well and Pipeline Performance to Improve

Forecasting Accuracy; • Apply Constraints, Schedules, Availability, Reliability etc…

at any Node in the Model;

Applications for Previso6

Production Optimisation• Rank and Prioritise a Product Stream;• Optimise Well Offtake Rates based on Ranking:• Identify De-bottlenecking Opportunities;• Quantify De-bottlenecking Implementations.

Key Functionality of Previso• Improved User Experience with a new Graphic User Interface

• Automatic error warning and resolution;

• Material Balance Reservoir Modelling• Water Handling (Aquifer models);• Material Balance Reservoir Model Tuning Capability;

• Well Modelling:• Detailed Reservoir Inflow Modelling• Detailed Well Vertical Lift Performance;• Nodal Analysis Model Tuning;

• Water Handling:• Multiphase pressure drops in wells and pipelines;• Calculates Water of Condensation;• Free-water break-through calculations in tank models.

• Automatic Type-curve Generation:• Imports from Eclipse summary files (.RSM) and generates type-curves for previso.

• Scenario Manager• Deterministic, Large-Scale Sensitivity and full Probabilistic analyses.

• Economic Modelling• Optional, built-in, directional economic capability utilising an internal spreadsheet engine.

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Material Balance Can model single and multiple (connected) tanks.

Water Handling (Aquifer models);

Define Aquifer Models – calculate water influx.

Determine water break-through with Volume vs Depthcurves and a GWC datum.

Determine free water production with relative permeability data.

Material Balance Reservoir Model Tuning Capability

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Well Modelling Detailed Inflow Modelling

Vertical, deviated & horizontal wells.

Detailed Vertical Lift Modelling Construct the wellbore; Import pressure drop tables;

Nodal Analysis Sensitivity analysis of all inflow and vertical lift parameters; Tune IPR and VLP curves to production data.

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Pipeline Modelling Various Pressure Drop Models Available

Apply Multi-phase correlations;

Pressure equations &

Import pressure drop tables from an external source.

Pressure Drop Analysis and Calibration Enter measured field data;

Change all inputs variables to assess the quality of the match to field data;

Vary pipe geometry (diameter, roughness); inlet and ambient temperatures and OHTC;

Vary fluid properties;

Tune multi-phase correlations.

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Type Curve Generation Automatically generates Type-Curves from Eclipse summary

results files (.RSM). Import hundreds of type-curves in one instance.

Apply compositional mapping via importing of CVD fluid tables.

Map each type-curve to the elements in the model by dragging and dropping.

Various Type-Curve Formats Available Gas Potential & Gas Rate vs Cumulative Gas (conventional gas fields)

Gas Potential & Gas Rate vs Time (unconventional gas fields)

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Scenario Manager Generate Multiple Scenarios in the Single Model

Change a single parameter many times;

Change and combine multiple parameters many times;

Define a probabilistic density function on any parameter and combine them all.

Several built-in probability distributions are included.

Advanced Plotting and Reporting Function A customisable ‘dashboard’ to visualise all results;

Create combined or separate reports/plots;

Ready-made charting tools are included to visualise the impact each parameter has on the portfolio-level outcome such as reserves, gas plateau length, compressor requirements, campaign timing etc …;

Create custom reports to visualise the key impacts from each parameters.

Readily exportable into Excel.

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Economic Modelling Optimizing production is only half of the problem; Previso is

now adding built-in, directional economic capability.

Economics will be done by an internal spreadsheet engine: This engine allows users to change and audit economic models such as changes

to fiscal regimes.

Economic calculations are optional for each Previso run.

Economic reports can be generated in Previso Reports can be edited, plotted, compared to other scenarios, or viewed

in Excel seamlessly.

Standard economic indicators available for each scenario;

Incremental economics can be run between scenarios;

Direct value comparison of multiple development options;

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Level 11, 216 St Georges Terrace Perth 6000 Western Australia

support@previso.net | www.previso.net