New Features

Changing Liquid Level option is available in the Closed Chamber Test (CCT) analysis/model.

Known Issues/Fixes

Modified plotting algorithm for superposition time function to accommodate extremely large superposition times.

Resolved issues in transient deliverability forecast when adjusting forecast duration.

Delta-p-squared values are properly displayed in AOF reports.

Resolved deliverability forecast issues and early-time instabilities in the “Multilayer Pi” model.

Analysis lines in AOF are properly displayed when opening an existing file.

The first data point is included as a “selectable anchor point” in SLUG/PITA/CCT models.

Improved data interchange used for transferring data between F.A.S.T. RTA™ and F.A.S.T. WellTest™.

Resolved updating issue with Oil correlation name in reports.

Resolved issues encountered when adding data to the end of the production editor and manipulating the date/clock time.

Resolved issues with negative skin calculation in Slug/PITA/CCT models - Improved behaviour of warning messages.

Skin validation and error messaging has been included in deliverability forecasts.

Diagnostic analysis options now appear by default when selecting a diagnostic analysis line.

Modified precision of interval depths for TRG, SG, and DST PAS types to comply with ERCB PAS format changes.

Rate units on forecast plot are updated when changing fluid type in test design.

Improved behaviour of wizards.

Improved error checking in Multilayer Pi model.

Modified forecast calculations in non-conventional models. Files including forecasts created with non-conventional models in version 7.0.1.31 should be updated to include these modifications.

Changed labelling of EUB to ERCB in PAS files to comply with changes implemented by the Alberta government.

PAS certify errors are now saved with a “#” sign to mark them as comments in the PAS file.

New Features

Closed Chamber Test (CCT) Model which considers “stepped-change” in wellbore storage to accommodate down hole shut-in used during drillstem tests and perforation inflow/injection tests.

Known Issues/Fixes

Model calculations (including A.P.E.) for gas wells have been optimized to significantly  increase calculation speed for complex production histories.

Modifications to the AOF analysis have resolved plotting and annotation issues.

Issues with changing forecast conditions at t2 & t3 have been resolved.

Files are properly saved after inserting additional rows in the production editor.

Boundary conditions/hydrocarbons-in-place are properly displayed when switching between closed and infinite-acting boundary conditions.

Resolved instabilities in multi-layer model with unequal Pi.

Increased precision of bottom hole pressure calculations for horizontal wells when comprehensive deviation surveys are utilized.

Re-activated option to run forecasts at specified wellhead pressures.

Improved functionality of creating EUB PAS files.

New Features

Multi-Layer Analytical Model for Gas Reservoirs:
• Considers “Unequal” Initial Layer Pressures,
• Deals with crossflow (in the wellbore) during pre-flow, drawdown and build-up periods,
• Honours material balance by calculating “individual pseudo-time” for each reservoir layer,
• Accounts for hydrostatic pressure differences (in the wellbore),
• Assumes well is in the center of cylindrical layer shape.

Material Balance Pseudo-Time for dry CBM reservoirs:
• Incorporates “desorption compressibility” in the total system compressibility,
• Implemented to allow access to all existing diagnostic analysis and models,
• Assumes “equilibrium desorption.”

Anisotropic Analytical Model for Fully & Partially Penetrating Vertical Wells:
• Solves for horizontal permeability (kx, ky) in “fully penetrating” vertical wells,
• Solves for horizontal permeability (kx, ky) and vertical permeability (kz) in “partially penetrating” vertical wells,
• Accommodates “interference analysis” with observation wells in either the “X” or “Y” direction to help determine horizontal permeability anisotropy ratio.

Closed Chamber Test (CCT) Analysis:
• Based on PITA theory,
• Considers “instantaneous” decrease in wellbore storage to accommodate the effect of down-hole shut-in during drillstem tests and perforation inflow tests.

Interoperability with F.A.S.T. RTA™:
• Production data, reservoir and fluid properties contained within F.A.S.T. RTA™ or F.A.S.T. WellTest™ can be accessed by simply opening a file created by either program,
• Switching between production data analysis and pressure transient analysis is quick and easy,
• Improve estimates of gas reserves and reservoir characteristics by combining production data analysis and pressure transient analysis,
• Requires F.A.S.T. RTA™ version 3.5 or higher.

Error Checking To Remove “Empty Data Lines:”
• Avoids bloating from files that contain numerous time entries without corresponding pressures or rates.

Improved Report Functionality:
• Report pages can be re-ordered with “click and drag” operation,
• Overall interface functionality has been enhanced.

Enhanced Plot Customization:
• Customization of plot and data attributes is more robust with many new options and features,
• Incorporates “on-demand” access to customize options.

Known Issues/Fixes

The PITA model no longer incorporates the solution for a partially penetrating well. When opening PITA models created in a previous version, minor adjustments to the model parameters may be required to maintain a match with actual test data.

Model calculations including A.P.E. (Automatic Parameter Estimation) for gas wells have been optimized to significantly increase calculation times for complex production histories.

Functionality within the AOF analysis has been enhanced.

The algorithm used for calculating gas pseudo-pressures has been improved. When opening an analysis for gas fluid types created in previous versions, there may be a slight difference in the calculated pseudo-pressure. If this occurs, existing diagnostic analyses and models will require minor adjustments to account for the change in pseudo-pressure.

New Features

A new data interchange has been incorporated to import production data directly from any .fld file or PRD.PAS file created with F.A.S.T. FieldNotes™ V. 3.000 (or higher). To enable the new data interchange, you must either have an active license of F.A.S.T. FieldNotes™ 3.XXX or a copy of F.A.S.T. FieldNotes Viewer™ 3.XXX (included in the WellTest installation). This is part of an interoperability initiative to share more information between F.A.S.T applications.

Implemented error checking to identify/remove blank data lines.

Improved functionality of re-arranging pages within the new reports.

Improved functionality of creating AEUB PAS files

Known Issues/Fixes

Issues with Gas-Condensate two-phase skin and two-phase pseudo-pressure calculations have been resolved.

Issues with Oil & Gas two-phase pseudo-pressure calculations have been resolved.

Corrected warnings associated with PVT correlation limits.

New Features

A new diagnostic analysis/model Perforation Injection Test Analysis has been implemented to deal with pressure data obtained when perforating over-balanced.

A Test Type selection dialogue has been added to ensure all calculations for conventional and unconventional tests are properly performed.

Graphical tools have been implemented to clean/manipulate data.

A Select Range feature is now available to isolate data to be used for analysis/modelling, giving the ability to revise a selected range without re-importing data.

Fluid property correlations used for determining PVT properties are now displayed in the reports.

Expanded wizards to provide greater flexibility when dealing with various data formats.

The calculated EUR is identified from the cumulative production curve on the forecast plot.

Messages are now displayed if the EUR is not reached within the specified forecast period.

When copying analyses/models, all annotations and scales are preserved.

Improved scaling and linear regression routines within the Determine Shut-In interface.

Added fit to page and page ordering options in the new reports.

Added multiple annotations delete option to analysis/model plots.

Added option to change precision of values displayed in any column of the production editor table.

Optimized transient forecast calculations.

Added several help topics pertaining to skin components and multi-phase pseudo-pressures.

Known Issues/Fixes

TVD and MD fluid levels are now supported.

Data files (excluding AEUB PAS files) with different time formats can now be appended.

All AWS PAS files generated from WellTest are now properly formatted.

Multi-phase pseudo-pressure calculations have been modified to eliminate unstable behaviour. Further modifications are pending to address issues with two-phase skin calculations.

New Features

New Diagnostic Analysis and Model (PITA) for analyzing Perforation Inflow Tests.

New Robust Reporting System with Collating and Enhanced Customization Capabilities.

Enhanced Diagnostic Analysis and Model for Slug Tests.

Enhanced Real-Time Snap-In (interface required for communicating with pressure sensors/flow meters).

Enhanced Bottom Hole Calculations to accommodate Split Flow paths in Pumping Wells.

Enhanced Filter to accommodate Bottom Hole Calculations with a Large Number of Pressure and Liquid Depth Measurements.

Enhanced plot annotation/titles/axis labels.

Multi-layer Pi Model is functional for liquid systems only.

AWS PAS files can now be generated for submission to AEUB.

Known Issues/Fixes

When opening an AWS PAS file, the “true vertical depth liquid level” is displayed as “measured depth liquid level.”

New Features

Results from all Pressure FallOff analyses are now properly displayed.

Synchronization of diagnostic lines using different time/pressure functions has been improved.

Removed observation parameters from default wedge model annotations.

Models with analysis lines can now be copied from the “Model Parameters Tab."

Frequent display updates of simulated data have been restored during the auto fitting process in models.

Proper defaults for kx,ky,kz now appear for horizontal and slant models.

Partial penetration skin is now calculated in the radial diagnostic analysis without entering wellbore inclination.

Functionality of diagnostic lines in drawdown analyses has been improved.

Tooltip now appears in model boundary diagram.

Added “Apply Button” to initiate pressure adjustment in MPP Adjustment wizard.

Production editor and modeling toolbars now automatically adjust to show all icons on screen when using low resolution, or small monitors.

Known Issues/Fixes

If a file is saved while previewing a diagnostic analysis plot, the diagnostic lines will appear “stretched-out” when the file is re-opened. To avoid this, please close “print preview” before saving the file.

Known Issues/Fixes

Oil properties determined from correlations will now update correctly when the correlations are changed. Oil analysis performed with version 5.562 may require updating.

Some annotation boxes, associated with diagnostic lines created in version 5.562, do not display parameters when the file is opened in version 5.589. To view the parameters, a new diagnostic analysis must be performed.

Updating issues with plots in the LIT section of AOF analysis have been corrected. All parameters calculated during a LIT analysis are now available in the annotation text display.

An adjustment has been made for wellhead pressure calculations in AOF Analysis and Model Forecast to account for large temperature gradients. Some analyses performed with version 5.562 may require updating.

The synchronization issue for radius of investigation, when using multiple arrows in the diagnostic analysis, has been resolved.

Parameters missing on the boundary report, in models, have been restored.

For users in Alberta, all outstanding AEUB PAS issues have been resolved.

Effective producing time calculations have been incorporated in the production editor wizard.

A “Calculate” button has been incorporated in the forecast section, in models, to minimize calculation time when using the wellhead option.

Additional flow path options have been added for bottom hole pressure calculations in the AOF interface, and calculations to account for a measured liquid level have been modified.

Known Issues/Fixes

Line synchronization has been corrected for drawdown analyses.

Resolved updating issues for cases where multiple analyses/models were present with different selected flow periods.

Corrected BHP calculation when using the casing option in AOF.

Deviation survey has been added to the BHP interface and incorporated into the calculations.

New improved plot defaults interface, which covers AOF/IPR plots.

Fluid level at TVD has been added to the production editor to comply with PAS submissions.

A simplified and improved effective producing time wizard has been added, to allow effective producing time to be calculated using cumulative production and rate—as well as entering it directly.

Analysis line annotations have been changed to the same style as other plot annotations. Due to this change, direct input parameter entry is no longer available via the annotation itself. Please use the analysis line options dialog to enter any input parameters.

Typecurve line annotations no longer move with the line but stay in place to reduce excessive adjustment of the annotations.

New Features

Can now randomly change the file name when opening an AEUB PAS file.

Pressure calculations (for flow through casing) can now be performed in AOF analysis.

Bottomhole pressure calculations have been modified due to complications involving afterflow (during early-time shut-in periods), and to incorporate optional fluid level entries.

Due to modifications made to the bottomhole calculations (as stated above), we recommend re-calculating bottomhole pressures in files created in version 5.064 and all previous versions.

Increased diagnostic analysis default line lengths on typecurve plot.

Known Issues/Fixes

Corrected the “calculated skin-equivalent to the horizontal wellbore length” in the diagnostic derivative analysis.

Analysis reports can now be customized and saved properly.

Calculated values for “pressure drop due-to-skin” in Radial analysis are now displayed properly.

Calculated “average error” in model reports is now displayed properly.

Improved font appearance in some views and dialogues.

Enhanced data importing and appending functions.

PAS Updates:
• All requirements for AWS and In-line AOF PAS files have been implemented.
• Improved PAS interface.
• Corrected several certify messages that were not consistent with AEUB validate messages.
• Removed option to save DTINRPR table (now always saves).
• Correctly offset DTINRPR times when submitting previous production history and no gauge information.

Known Issues/Fixes

Corrected a flaw in calculations for the wellhead pressure option in transient forecast.

Data importing selections now include condensate rate, fluid level and gas/oil/water gradients.

Pressure selections within the data importing routine, and pressure labels for reports, have been modified to identify the appropriate pressure source (i.e. Tubing Pressure, Casing Pressure, Sandface Pressure, Calculated Sandface Pressure).

Pseudo-time calculations have been modified to correct a flaw encountered under unique circumstances.

Corrected total mobility calculation in diagnostic analysis.

Corrected Pskin, FE, and DR calculations in radial analysis, and added respective parameters to display in annotation.

Corrected Pskin calculation in models generated for injections/falloffs.

Corrected skin calculation on typecurve radial line.

Corrected various PAS issues.

Enhanced line movement on diagnostic plots.

Enhanced scrolling function in production editor.

Corrected minor deficiencies in AOF analysis.

New Features

Added Inline Rate and Pressure Summary Table Option (INRPR). By default WellTest no longer includes the INRPR table when saving to a PAS file to concur with current EUB requirements for inline AOFs. The EUB has agreed to accept this table as a conditional requirement in the near future. If you wish to include this table in the PAS file then you may do so from the main F.A.S.T. WellTest menu by selecting “Edit | Defaults | File Defaults” and checking “Include INRPR Table in PAS-TRG file.”

Added “Unknown” choice to all drop down lists under the PAS -TRG tab.

PRD-PAS 4.0 files can now be loaded into ValiData and WellTest.

Known Issues/Fixes

Company code is now saved correctly.

Fixed total gas rate calculation when using condensate rates.

Fixed gas gradient calculation.

Fixed BHP calculation when using a fluid level less than MPP.

Fixed oil/water ratio when using fluid levels in BHP calculation.

Various stability fixes.

Headers now transfer to the transient forecast plot properly.

Can now print reports from the menu in AOF.

New Features

Added analysis options floating dialog that allows you to create analysis lines in either four-plot or single plot mode and displays relevant input parameters such as hp, khkv, k, kfw, etc.

Plot print scaling and annotation scaling are now available via the plot customization dialog to give complete control over plot annotation size during copy/paste and printing operations.

Slug test analysis and slug model now support the typecurve plot type.

PPD curve is now plotted on a separate axis on the typecurve for more flexibility.

Known Issues/Fixes

Fixed crashes in analysis/models, arrow creation problem on the forecast plot, mixed units problem in plots and analysis annotation boxes (they no longer move with the scale).

Corrections to the Effective Producing Time (Horner Time) wizard, AOF/LIT, PAS and importing.

New Features

Full screen production/pressure data interface with integrated graphics for easy data entry and manipulation.

Surface pressures can be converted to bottom hole pressures using static or varying fluid levels. Gradients are calculated based on specified fluid rates.

Pressure data can be modified to account for geo-tidal effects, using a sophisticated tidal filter.

Extensive use of “drop lists” makes importing data much easier.

A new process for determining the final shut-in point.

Wizards are available to guide users through fundamental steps from data entry to final analysis.

All diagnostic analyses are performed in a multi-plot tab view that incorporates the new plot interface introduced in the model interface in earlier versions.

Multiple analysis lines are supported on all diagnostic plots. Movement of analysis lines on the radial, linear and bilinear diagnostic plots is synchronized with the movement of the corresponding analysis lines on the derivative plot.

Point and click plot customization interface, which includes all annotation arrows.

A spray or “free-hand tracing” method for selecting data used in “least squares fit”.

Plot defaults interface for configuring analysis/model plots.

Reservoir parameters are entered in the analysis/model tabs, rather than in a separate editor, to avoid errors and allow for quick changes.

The “data chart” used for selecting flow/buildup periods for analysis has been moved to the multi-plot analysis/model view for easy access.

Multi-Layer model that considers different pressure in each layer, and supports crossflow prior to production.

Diagnostic line (-1 slope) for identifying additional flow regimes (i.e.: constant pressure boundaries, leaky fault, etc.)

Deliverability (AOF) analysis is performed with a “full screen” production/pressure data interface with integrated graphics, which incorporates “point and click” technology to select points directly off the data chart. There is direct access to wellbore pressure drop calculations to determine wellhead and/or sandface pressures that are not measured. Multi-plot view and a superior plot customization interface allow for easier analysis and presentation of results. A direct link provides a summary of the analysis/model results for stabilized pressure, k and skin (for LIT analysis).

The sandface deliverability curve is re-defined as “IPR” (inflow performance relationship), and the wellhead deliverability curve is re-defined as “OPR” (outflow performance relationship).

The deliverability forecast accounts for turbulence if the D factor is specified in the model.

The deliverability forecast can be generated by specifying either a sandface or wellhead flowing pressure.

Known Issues/Fixes

F.A.S.T. WellTest™ Version 5.000 (and greater) is compliant with AEUB PAS Version 4.0. All AEUB PAS formats previously supported by F.A.S.T. WellTest™ can be readily converted from PAS version 2.1 to PAS version 4.0 formats. It should be noted that PAS 4.0 supports a new TRG format that replaces the AWS, TRG, and AOF formats used in version 2.1 of PAS.

When files created in previous versions of F.A.S.T. WellTest™ are opened, the analyses are preserved, but text/results annotations created in the diagnostic plots are not preserved.

Known Issues/Fixes

Can now view transient forecast listing if flowing pressure is specified for case 2 or 3 and not for case 1.

Dataset name modifications in the transient forecast were getting reset when changing tabs or reopening the file. This has been resolved.

New Features

Reservoir pressure and cumulative production can be plotted on the data chart in models.

New Multi-Layer model with rectangular layer shapes, leaky fault model and slug test model.

Impulse Radial Analysis option for extrapolating the reservoir pressure from buildup data obtained after perforating.
Afterflow rates can be used to calculate BHP during shutin periods, to account for friction in high deliverability gas wells.

Afterflow rates are incorporated in models when simulating turbulence.

An option is available in the BHP calculations to adjust early-time shut-in pressures when dealing with high rates and/or liquids.

Test design incorporates the new model interface, and all new models.

Additional toolbar buttons in modeling for weighting or unweighting Pwfo, setting the anchor to Pi or Pwfo, and selecting data points for matching.

Transient forecasts can be generated for three different flowing pressure/skin values. Also, the flowing pressure and/or skin can be changed at two specified times during the forecast.

Optional Bourdet derivative calculation.

A filter has been added to remove tidal effects.

Diagnostic plots are easily generated for Real-Time analysis.

Enhanced pseudo-time calculations account for small pressure losses.

Routine for weighting and excluding data points in models is enhanced.

The rate-pressure editor dialog can be resized to view the data chart simultaneously.

The rate-pressure editor incorporates an interactive error status report for correcting time sequence errors.

Known Issues/Fixes

Since the pseudo-time calculations have been modified, please be aware that models/analyses created in previous versions may be slightly different.

To gain access to Real-Time analysis, a special add-on is required to communicate with the data gathering unit (RTU or Flow Computer).

Known Issues/Fixes

Minor problems experienced in the "Automatic Parameter Estimation" routine in Models have been resolved.

Some data files could not be properly imported. This problem has been corrected.

If the test duration exceeded 10,000 hours, the cumulative time in the AWS and TRG pas file was incorrect. The AWS and TRG pas files will now accept test duration up to 100,000 hours.

Gas rates reported in m3/min and m3/hour are now correctly converted to m3/day.

The 3 and 6 month forecast rates are now calculated for a user specified flowing pressure.

Problems printing to pdf files have been resolved.

Entries in model menus would sometimes disappear. This problem has been corrected.

Direct Messaging: The "About Box" (Start-up Screen) has been modified to incorporate "Direct Messaging". If you have specific questions about the program, or wish to report a bug, click the "To: Fekete" icon in the lower left corner of the About Box. Type your message, and attach your file for reference. All messages will be automatically sent to welltest@fekete.com. If you wish to visit our web-site to check for upcoming courses, technical publications, or other services offered by Fekete, click the "Fast" icon in the lower left corner of the About Box.

UPGRADE ALERT: When an upgrade becomes available, the following message will appear near the top right corner of the About Box: "New Version X.XXX Now Available". Clicking the Book icon will direct you to a summary of the Release Notes. Clicking the Download icon will automatically download the new version, if you have a valid serial number.

Known Issues/Fixes

All bugs reported in version 3.000 have been fixed. Modifications have been incorporated to enhance data entry.

New Features

New model interface with on-screen reservoir schematic that displays all boundary conditions as they are selected. A printable schematic shows reservoir dimensions and distances to no-flow/constant pressure boundaries in both the horizontal and vertical directions.

Enhanced model parameter editing functions, which include default selections from existing analyses.

Improved production forecast plotting allows any combination of cumulative production, reservoir pressure and flowing pressure to be plotted versus production rate or cumulative production. Oil forecasts display reservoir pressure decline above bubble point.

New model for hydraulically fractured wells with boundaries.

New model for a well in a wedge.

Radial composite model now has unlimited regions.

Multi-layer model now has unlimited layers communicating at the wellbore.

Enhanced plot customization in the new model interface.

The Rate-Pressure Editor (formerly called "Production History" editor) has been modified to facilitate the use of Date/Clock Time. Afterflow rates are now calculated and displayed. Tubing and casing pressures are now displayed in the table to compare with calculated bottom hole pressures.

The graphical rate editor has been modified to allow greater flexibility in entering production data.
Rate history is now saved with all AWS and TRG pas files.

New Features

The Derivative of the Superposition (Horner) plot can now be displayed on the log-log plot in terms of "Pseudo-Time", in addition to "Real Time" and the other standard time options.

Known Issues/Fixes

All bugs reported in version 2.428 have been fixed. In addition, the Date/Clock Time feature in the Production History editor has been enhanced to deal with complicated production histories. For example, after importing time-pressure data, it is now possible to input previous production by using Date/Clock Time entries, rather than using delta time or cumulative time entries. The following is a brief overview of how the system operates:

When entering Production History, a dialog box appears, which requires a Start Date/Clock Time entry. The default is the current Date/Clock Time of the analysis. This should be changed to reflect the actual Start Date/ Clock Time of the existing test data, if this option is intended for entering additional data, or for generating a production history report with the Date/Clock Time displayed. To display the Date/Clock Time column, click beside this option listed at the bottom left side of the Production History editor.

To enter previous production, insert the desired number of rows. When the Date/Clock Time dialog box appears, enter the new Start Date/Clock Time. This usually corresponds to the time when the well is first opened to flow. Therefore, the first cum. time is zero, and the corresponding rates should be entered as zero on this row. As Date/Clock Times are entered, the cum. time is automatically calculated and displayed in both of the existing time columns. Therefore, when using Date/Clock Time, the first "Time" column can be removed from the display.

When inserting rows at the beginning of the production history, the original Start Date/Clock Time is also changed to the new Start Date/Clock Time. This must be reset to the original Start Date/Clock Time, or a Date/Clock Time greater than that entered on the last row inserted, so the cumulative time can be re-calculated to include the previous production history.

The bottom hole pressure calculations are now accessed through the "Calculate" button, which was previously labeled "Well >> Snd".

New Features

Two companion programs (F.A.S.T. PvtPlus & F.A.S.T. Recomb) are now available for linking to the F.A.S.T. WellTest program.

F.A.S.T. PvtPlus: A user friendly program that utilizes several different correlations for estimating oil and gas PVT properties. The program provides the capability to graph and compare properties from different correlations. Comprehensive documentation on the correlations is also provided.

F.A.S.T. Recomb: A user friendly program that performs a molal recombination of gas and condensate streams to determine the reservoir gas properties and recoverable hydrocarbon liquids from gas-condensate reservoirs.

To show our appreciation for your continued support, we are pleased to provide you with one copy of F.A.S.T. FieldNotes for a limited time of six months, free.

F.A.S.T. FieldNotes: A sophisticated spreadsheet that is used by 80% of the well testing companies in Canada to record well test data. The test data are easily imported to F.A.S.T. WellTest for further analysis.

PRODUCTION HISTORY: The production history editor is under development to expand the options for entering data and performing calculations required for specific test conditions. As a result, the editor has assumed a new look. However, the logic for entering data has not changed significantly. The Help documentation for production history will be updated when development is completed. The following is a brief overview of the modifications completed in this version of the program:

At the bottom of the production history editor, there is a selection for five categories of data (Time, Pressure, Rates, Recombination Rates and Miscellaneous).

Time: In previous versions of the program, time is entered as hours, minutes or seconds. The entered time column is displayed, along with a calculated cumulative time column. The new version includes the Date/Clock Time for every reading, which is either calculated from the time entries, or input directly. When calculated from time entries, the Start Date/Clock Time defaults to the date and time the data are entered. The Date/Clock Time can be reset to correspond to the actual Start Date/Time of the test, by simply changing the values on the first row. Any combination of the three time columns can be displayed, but the Cumulative Time column must always be displayed.

The error checking algorithm for time entries is now performed when exiting the production history editor by clicking OK.

Pressure: The pressure category contains three options; Tubing Pressure, Casing Pressure and Pressure. The first two options are not currently enabled, and only the "Pressure" option is displayed in the table by default. The function of the Pressure option is unchanged from previous versions, and represents the sandface pressure used for pressure transient analysis. The sandface pressure is either directly measured with a pressure gauge, or is calculated from a measured wellhead pressure. Once development of the production history editor is completed, the wellhead pressure (Tubing or Casing Pressure), used for calculating the sandface pressure, will also be available for display in the table. The bottom hole pressure calculations are now accessed from the production history editor, by clicking the button labelled "Well >> Snd". Once bottom hole pressure calculations are completed, the button label changes to "undo", so the wellhead pressures can be recovered, if necessary. These functions are unchanged from previous versions.

Rates: Entry of fluid rates is unchanged, but the option to display any combination of fluid rates in the table, is now available.

Recombination Rates: This category has been added to enhance the production data entry for gas-condensate reservoirs. The previous version of the program allowed the gas equivalent of condensate to be estimated by applying a constant gas rate factor, called the recombined gas rate factor (RGRF), to the dry gas rate. This factor can now be turned on or off in production history by clicking on the RGRF check box in the Condensate Rate column. When RGRF is not checked, the gas equivalent is determined from the condensate rate, if it is entered. The total gas rate can be displayed by checking the Recombined Gas Rate check box in the production history editor. There is also a "Use" check box in the fluid properties editor (next to the calculated Recombined Gas Rate Factor), which enables/disables the use of recombined gas rate throughout the analysis and modeling calculations.

Miscellaneous: This category is not functional at this time. It is intended to provide greater flexibility in bottom hole pressure calculations, such as for AWS tests.

Pseudo-Time: A new "material balance pseudo-time" has been incorporated for drawdown analysis and deliverability forecasting in gas systems, to account for changing compressibility due to depletion. Discussion on the theory and how it is implemented is included in the Help documentation.

NEW TIME OPTION FOR PLOTTING DERIVATIVE: The derivative of the Superposition (Horner) plot can now be presented on the log-log plot using "real time", in addition to the standard time options.

TRANSIENT DELIVERABILITY FORECASTING: Changing compressibility is now accommodated with the new "material balance pseudo-time". An accurate "Full Life" forecast can now be generated for any reservoir model, if the reservoir size is specified. Also, the reservoir pressure is tabulated with the forecast rates and cumulative production for gas wells.

MODELS: With the introduction of "material balance pseudo-time", the reservoir size and gas-in-place can be more accurately determined from extended tests, when significant depletion has occurred. The calculated gas-in-place (GIP) can now be displayed in the model report and on the plots. On the model plots, this is accomplished by selecting "gas-in-place" from the parameter option, which appears in the pop-up menu when the right mouse button is clicked on any plot. The parameter can be displayed in the model report through the "customize report" option.

AOF: Legends can now be displayed on the AOF plot and deliverability curve. This option can be accessed from the "configure" selection in the pop-up menu that appears when the right mouse button is clicked on any plot.

New Features

A new "TAB VIEW" allows the analyst to keep track of all diagnostic analyses.

Selectable correlations provide flexibility in estimating fluid properties. Oil compressibility now defaults to reflect "undersaturated" conditions.

Selectable correlations are available to calculate pressure drop in the wellbore under different multi-phase flow conditions.

Calculations can now be performed to determine multi-phase skin and multi-phase pseudo-pressure for bubble point and dew point systems.

Re-combined gas properties for gas-condensate systems are now easily calculated.

Filtering now allows unlimited flow/shut-in periods.

In test design, the number of flow/shut-in sequences is now unlimited.

Enhanced PAS file generator for Alberta Government submissions.

New Features

Pseudo Time is Now Available.

Enhanced Filter dialog (unlimited flow periods).

Enhanced Test Design editor (unlimited flow periods).

Added the ability to adjust time track when reading in production data.

Direct loading of FieldNotes files (*.fld) into production history.

The ability to change pressure recorders within production history.

Known Issues/Fixes

Corrected problems when creating an PAS-AWS file.

Legend lines now stay within the legend box.

AOF Results Summary, the problem with Wellhead / Sandface switching and LIT flag problem have been fixed.

New Features

WellTest™ and ValiData™ now share the file extension .Fkt and can be opened interchangeably.

PAS files can now be created completely in WellTest, completely in ValiData™ or partially in ValiData™and partially in WellTest.

ValiData™ and WellTest™ can now read FieldNotes files (*.FLD) and PRD.

PAS files for the purpose of importing surface pressures or rates. In order to edit or create a PRD.

PAS file you must use a separate program such as F.A.S.T. FieldNotes.

ValiData™ can now create recorders (both acoustic recorders and regular pressure, temperature and rate recorders).

ValiData™ can now handle multiple static gradient analysis when writing static gradient PAS files.

Print outs now reflect which gauge was used to generate a gradient.

Manual reads allow you to choose the data type for the recorder.

ValiData™ and WellTest™ can both handle multiple Acoustic recorders.

New Features

WellTest™ now creates TRG, AWS and AOF PAS files.

ValiData™ now creates GAN, OAN and WAN PAS files along with TRG, SG, AOF and AWS PAS files.

WellTest™ now imports analysis information into the interpretation sections of TRG, AWS and AOF PAS files.

New Features

Modeling of multiphase (gas + oil + water) flow inside the reservoir. All reservoir models can deal with multiphase behavior. Each model shows the calculated effective permeability for each individual phase, and total mobility.

Included non-linear pressure scale for gas well data. Internal to the computer, the analyses are still performed in terms of pseudo-pressure, but the graphs can now be displayed with a pressure scale as well as the traditional pseudo-pressure scale. The display defaults to the non-linear pressure scale.

"Bubble Help" has been implemented for the model parameters in the SYNTHESIS section.

The forecast duration (used to predict the deliverability) can now be specified separately from the shut-in duration (used for extrapolating the reservoir pressure) in the models.

Plotting features such as line types and font selection have been added. Font selection has been added to annotations, arrow parameters, headers and labels.

Font selection has been added to annotations, arrow parameters, headers and labels.

Known Issues/Fixes

Incompatibility with some printers has been fixed.

Included calculation of productivity / injectivity index from "fall-off" tests.

Incorporated an error-checking algorithm for time entries when importing or manually entering pressure/rate data. If the program detects a duplicate time value, or a time value that is less than the preceding value, an error message appears on the monitor, which identifies the row number. The user must then correct or delete the line if it is determined to be an input error. If this occurs when the time value is re-set, where there is a switch from a flow period to a shut-in period (or vice-versa), a "–" sign must be entered in front of the time value on the specified row. The program will then read it as a "delta-time", as opposed to a cumulative time, and will allow the user to proceed with an analysis.Auto-Read now has a by-pass to enable "manual" selection of formats so that multiple recorders contained in a single file can now be read.

Some details of PAS are still being ironed out and subsequently PAS is constantly changing. Whenever any changes to either the PAS section of WellTest™ or to any other section are required, WellTest™ will be promptly revised.