The typical WSDAQ Screen shown above is from an 11,490’ well with a normal rod pump in operation. The well was renamed “Demo” to protect the proprietary information of the operator. This sounding was made from, and downloaded back to, our desktop via a secure internet connection from a wireless link to the wellsite unit. This information may be gathered by random request at any time, or on a preset schedule.
Overview of Main Screen display:
The top of the screen automatically calculates and displays the Acoustic Velocity, Casing Pressure and Feet to Fluid. Below this information are the main function buttons to easily navigate to the most used functions.
To the left of the numeric displays and main buttons, is a display of the raw data, before any filtering or amplitude manipulations are made to more clearly show specific information desired. (Beyond fluid levels, the location of downhole equipment, perforations, tubing and casing leaks, rod and tubing breaks, paraffin and scale buildup, gas and foam layers and other anomalies, may be visible in certain circumstances, and provided that they are located above the present fluid level.)
When this insert screen is hidden, using the button indicated on the screen, or when connection to a Accufluid Instrument (Surveyor, Monitor or Controller) is detected, buttons appear which are appropriate to the normal activities associated with the attached instrument. These include automatic downloading and filing of complete data collected by the instrument while it is operating without attachment to a WSDAQ Program. This information includes the complete sounding information and display shown above for up to 100 surveys retained in the remote instrument’s memory. The well name, serial number and security verification of the connected instrument is also displayed. The remote instrument’s operational settings and sounding criteria may be uploaded for verification, adjusted if necessary and downloaded back to the remote instrument. A sounding may be made and viewed in real time as it is displayed, collar by collar, across the desktop screen.
The well name, exact time of sounding, the feet to fluid and casing pressure are displayed above each sounding displayed, instead of the word Demo as shown here. The well name and location is omitted, as we are always very protective of any operator’s proprietary information. Up to eight well soundings may be displayed simultaneously for side-by-side comparison. These may be surveys from the same well at various selected times, or different wells in a field to access waterflood levels, etc.
According to workover records of the particular well shown, there is a changeover known to be located at 9,673 feet. This anomaly is most clearly visible on well soundings applying a specific frequency and amplitude definition range. The thin blue lines define an area within which the program is to search for this anomaly falling within this unique definition. Such a unique anomaly, often exist deep in a well, and above the desired target fluid level. The anomaly, as used here, is located by the program (the blue line tagged “FM”) and this known footage from surface is used to calculate the exact acoustic velocity a fraction of a second before this velocity is applied to the fluid level found just below. This assures the most updated and accurate fluid level ever obtained, because the velocity is calculated over the longest segment of the wellbore possible. Variations in gas layers may vary a fluid level substantially, if dividers or calculations are made from a short segment near the surface where collars are normally visible. This method eliminates that wide variance.
The image may be expanded and moved at will to examine any portion of the survey in detail, or manually calculate the acoustic velocity with a program of electronic dividers provided on the screen when the “Calculate Ft/Sec” button above the acoustic velocity readout is pressed.
When the desired features (Flag Marker & Fluid Level) are most clearly visible on the screen, usually with the frequency filter and amplitude adjustments shown, these settings may be saved or downloaded directly back to the monitor or controller in the field. This assures that every reading for the specific well conditions is the most reliable and accurate reading possible.
The program automatically calculates and displays the correct fluid footage over the pump entry. If less than 100’, or any selected safety margin, the tag turns red as a low fluid warning, and the little pump jack symbol stops moving to signify that the pump has been automatically shut down or slowed down if the unit is functioning as a well controller. In either case, an automatic message may immediately be conveyed to the operator for their attention.
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