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Estimating OGIP and Reserveswith Crystal Ball

[optimizing extraction of results with VBA]

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Content

IntroductionSheets description

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Introduction

This workbook can be used to estimate OGIP and Reserves applying the volumetric method.The workbook can estimate OGIP and Reserves using Crystal BallCode in the workbook can:

Initialize CB runsExtract percentiles [P90 P50 and P10]Extract CB charts

The workbook contains a section [sheets] to estimate Bg from gas composition.

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Sheets Description

Input Data (Volumetric)Volumetric_OGIP_ReservesSensitivity-ScatterOGIP AssumptionsFluid_DataCalcSolution_TablesPlotsProperties

The workbook contains the following sheets:

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Sheets Description

Sheet name: Input Data (Volumetric)

Show sheets to estimate Bg

Hide sheets to estimate Bg

Input data for volumetric estimation.Green cells will be used by Crystal Ball [Assumptions].If you want to add a variable to CB runs just set the cell as Assumption with CB tools.

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Sheets Description

Sheet name: Input Data (Volumetric)

Define Assumption on CB

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Sheets DescriptionSheet name: Volumetric_OGIP_Reserves

Summary of Assumption PercentilesCells are linked to sheet “Input Data (Volumetric)”

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Sheets DescriptionSheet name: Volumetric_OGIP_Reserves

Number of CB runs.When button [VBA] is used to Start CB runs, CB will

calculate this number of trials.

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Sheets DescriptionSheet name: Volumetric_OGIP_Reserves

Button to start CB runs. After CB finished results will be extracted from CB to MS Excel.

If CB runs are started from normal CB button, Results will be not extracted,

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Sheets DescriptionSheet name: Volumetric_OGIP_Reserves

Cells with equations to calculate OGIP and Reserves using the volumetric method.

Cells are linked to CB Assumptions, thereby, cells will change for each CB trial.

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Sheets DescriptionSheet name: Volumetric_OGIP_Reserves

CB trials output

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Sheets DescriptionSheet name: Volumetric_OGIP_Reserves

Percentiles results.Percentiles are extracted from CB after trials are

finished.

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Sheets DescriptionSheet name: Volumetric_OGIP_Reserves

Just an exercise of how much should be the “Merma” to have the gas reserve calculated by CB.

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Sheets DescriptionSheet name: Volumetric_OGIP_Reserves

CB chartsCB charts are updated after trials are finished.

Charts are updated only when CB run starts using the button.

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Sheets DescriptionSheet name: Sensitivity-Scatter

In this sheet the sensitivity and Correlation charts are extracted from CB.

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Sheets DescriptionSheet name: OGIP Assumptions

In this sheet the Assumption charts are extracted from CB.

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Sheets DescriptionSheet name: Fluid_Data

Input Data: Gas composition

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Sheets DescriptionSheet name: Fluid_Data

Input Data: Pressure and temperature at reservoir

conditions.

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Sheets DescriptionSheet name: Fluid_Data

Results at reservoir conditions

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Sheets DescriptionSheet name: Fluid_Data

Input data: ranges of pressure and temperature to generate curves.

There can be a range of pressures and No of steps can be changes for pressure

ONLY.

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Sheets DescriptionSheet name: Calc

This sheet is used to calculate gas properties.1.- Pseudo-pressure and pseudo-temperature are calculated2.- Adjusted pseudo properties are calculated using Wichert& Aziz Correlation Adjustment for Nonhydrocarboncomponents.3.- pseudo-reduced properties are calculated.4.- Factor-z, viscosity, gas density and Bg are calculated.

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Sheets DescriptionSheet name: Solution_Tables

This sheet has the results for every step in table generated in sheet “Fluid_Data”.

Also, there are charts for the gas properties.

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Sheets DescriptionSheet name: Plots

This sheet has the charts for the gas properties.

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Sheets DescriptionSheet name: Properties

This sheet has the properties for gas components.