4. From the Project Well List select the desired well and click on the DST icon in the center of the screen.
The DST module screen contains many tabbed submenus. Although DST offers flexibility in navigating the screen menus, they should be completed in the following order:
The Well Header tab shows and provides users the ability to enter and/or change well information. The Well tabbed page should be pre-filled with information from the pre-selected project well.
| The Parameters screen provides the user an interface for entering test parameters for a given drill stem test. The DST Search feature to see if tests information is available from the KGS system. To query the database for a list of available tests, simply click on the DST Search button (leave the Test Date blank). |  |
If records are available the user will be presented with a list choose from. Highlight the desired test and click the Load Button to load available DST records.
Since DST records in the KGS database are sometimes incomplete, you must validate and make change to the entries in the Details submenu. Also verify the Initial and Final Flow period entries prior to using the Worksheet screen.
Values entered in the Recovery Remarks fields of the Detail panel can be used in the Calculation segment of the DST module.
The Worksheet Tab provides an input screen for viewing and entering time/pressure values. These values are also pre-filled if found in the KGS DST database tables. To enter values manually, click on the first delta time cell of the time/pressure table and enter a valid delta time value. Pressing the Tab key will advance to the Initial Shut-in Pressure cell for data entry and then again, to the Final Shut-in Pressure cell. Repeat this data entry process until all DST time/pressure pairs have been entered.
When entering time/pressure value pairs, notice the points are interactively plotted on the small Horner Plot to the left of the input table. An algorithm attempts to scale the major and minor X and Y axis grid lines "on the fly." However, too large a range of values will cause the Major grid lines to clutter the plot.
The Horner Graph tab displays a larger image of the time/pressure pairs.
This panel also offers an interactive tool for estimating a best fit
line through the time pressure pairs. To utilize this feature click on
the "Check Box" and adjust the "Slide Bar" to discard points from the
array of point used to calculate the Least Squares Best Fit line. |
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Currently DST calculations can be made for Oil and High Pressure Gas values. Holding the mouse over a specific text field a tool-tip feature will provide a description of the requested input parameter.
For oil calculations, fluid recovery is determined by entering a percent value in the cell adjacent to the corresponding cell for recovery footage in the recover table. After entering a percent value click the Calculate Flow button which derives the total fluid feet and bbl/d production values.
Once total fluid and bbl/d values are derived click the Next button to Permeability Calculation Screen and complete the input screen to calculate; Transmissibility, In-Situ Capacity, Average Effective Permeability, Skin, Pressure Drop across Skin and Damage Ratio.
The Print button displays entered and calculated values to a new web browser page for printing to a local printer.
For gas calculations, the user completes the High Pressure Gas Calculation screen and presses the "Calculate Perm" button to show the results.
The Print button displays entered and calculated values to a new web browser page for printing to a local printer.
