Production Data - Stock Tank Rates

Fig. 1: Rate Input Options

The user can choose to input either stock tank or separator rates. This page goes through the details of working with stock tank rates. If you are working with separator rates, follow the information here instead here to Production Data - Separator Rates.

Rate Input - Stock Tank Rates

1. Date: production data recording date

2. Stock Tank Rates

   • qo: oil production rates at the stock tank (field: STB/d, SI/Metric: Sm\(^3\)/d, SI/Metric Canada: Sm\(^3\)/d)
   • qg: gas production rates at the surface (field: Mscf/d, SI/Metric: 10\(^{-3}\)Sm\(^3\)/d, SI/Metric Canada: 10\(^{-3}\)Sm\(^3\)/d)
   • qw: water production rates at the stock tank (field: STB/d, SI/Metric: Sm\(^3\)/d, SI/Metric Canada: Sm\(^3\)/d)

3. Measure Pressure and Gas-Lift Rates

   • Gauge Pressure: measured downhole gauge pressure (field: psia, SI/Metric: bara, SI/Metric Canada: kPaa)
   • Tubing Pressure: tubing pressure (field: psia, SI/Metric: bara, SI/Metric Canada: kPaa)
   • Casing Pressure: casing pressure (field: psia, SI/Metric: bara, SI/Metric Canada: kPaa)
   • Gas Lift: gas lift injection rate if using gas lift (field: Mscf/d, SI/Metric: 10\(^{-3}\)Sm\(^3\)/d, SI/Metric Canada: 10\(^{-3}\)Sm\(^3\)/d)
   • Liquid Level: measured depth of liquid level if using rod pump (field: ftMD, SI/Metric: mMD, SI/Metric Canada: mMD)
   • Line Pressure: line pressure (field: psia, SI/Metric: bara, SI/Metric Canada: kPaa)
   • Choke Size: choke size (field: 1/64 inch, SI/Metric: mm, SI/Metric Canada: mm)

How to Upload

There are three ways to upload production data into whitson⁺.

1. Manual Upload - Copy and paste production data into frontend
2. Datadump pre-populated flat files (excel or csv)
3. API /database connection for automatic data upload (updated every day)

The upload of production data for stock tank and separator is illustrated in the following gifs

Fig. 4: Uploading with stock tank data

Fig. 5: Uploading with separator data

Remember

1. Just upload the data you have a available, i.e. if you only have stock tank rates available, you upload the stock tank rates only, and vice versa.
2. If you don't want to calculate bottomhole pressures, you can skip the columns related to that calculation (tubing pressure, casing pressure, gas lift rates).

When the well is on gas lift, are gas rates netted or gross (including gas lift rates)?

The inputted gas rates in the production data editor are assumed to be netted out

$$\begin{equation} q_{gas} = q_{gas, flowing total} – q_{gas,injected} \end{equation}$$

The reason we do this is because the gas rate is used everywhere in the system, including numerical model, flowing material balance and RTA; and there the gas lift is not part of the calculation (i.e. not part of the reservoir flow).

In the BHP calculations, to get the total gas that is flowing inside the wellbore, we just do the calculation in the background as follows:

$$\begin{equation} q_{gas, flowing total} = q_{gas} + q_{gas,injected} \end{equation}$$

1. Manual Upload

1.1 Upload data

Fig. 6: Manual Upload Data

1. Click the "UPLOAD" to upload data.
2. Copy paste in the relevant columns.
3. Click "SAVE" to the lower left when finished.

Remember

1. The functionality is very similar to excel, so a good rule of thumb "if it works in excel, it works here".
2. Just upload the data you have available, skip the rest.
3. If separator production data is uploaded, remember to upload the corresponding separator conditions.
4. If separator rates are going to be used, remember that you have to run compositional tracking feature first to obtain stock tank rates. Read more here.

1.2 Edit data

Fig. 7: Edit Data

1. Click "EDIT" to edit data.
2. Change cells you would like to change.
3. Click "SAVE" to the lower left when finished.

1.2.1 Add more data points (rows)

Fig. 8: Add Data Points

1. Go to data below the last row.
2. Copy-paste in new rows of data.
3. Click "SAVE" to the lower left when finished.
4. Remember that the date (time) value must be unique, and increase in order.

1.2.2 Delete data (rows)

Fig. 9: Delete Data

1. Select data (row) you'd like to remove.
2. Use the "delete" or backspace key on your keyboard to remove row(s).
3. Click "SAVE"

1.3 Smooth data

If the inputed production data is bad, it can be smoothed graphically. See more in video above.

1.4 Visual Delete

1. Click "DELETE" and then "Visual delete".
2. Drag the black dotted line to the desired start date. Data before that line will be deleted.
3. Drag the blue dotted line to the desired end date. Data after that line will be deleted.
4. Click "Delete Selected Data" to save changes.
5. All the steps are shown in the gif above.

2. Datadump pre-populated excel file

Fig. 10: Datadump

1. Click the "arrow up" symbol to upload data.
2. Click the datadump option at the top of the dialog box.
3. Drag-and-drop the pre-populated datadump file into the frontend.
4. If you don't have the template from before, you can access it by clicking "Download Excel Template".
5. Click "Upload" to the lower left when finished.
6. All the steps are shown in Figs. 4 and 5 for stock tank and separator data, respectively.

3. API or database connection for automatic data upload

Contact support@whitson.com to set this up for your company.