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Tutorial: Modelling the effect of a different well geometry

This tutorial shows how to model the effect of a different well geometry on output. For more on using WellSim to model what-if scenarios like this see here.

This tutorial uses:

• The BottomUp discharge simulation Better BU 100 t/hr

• The BottomUp output simulation From better BU 100 t/hr that you should have entered earlier.

Overview

• This tutorial follows the basic steps for a BottomUp what-if scenario described here.

• In this tutorial you will:

  1. create a new geometry configuration with larger casing diameters
  2. use this to run a new BottomUp discharge simulation
  3. use this to run a new BottomUp output simulation
  4. use multiple graph to compare the new output curve with one made with the actual geometry.

• In this tutorial you will make copies of existing simulations, change them as necesssary and run them. This avoids having to write down and reenter data.

• The change required for this what-if scenario is to use a new geometry configuration with larger casing diameters.

Creating a new geometry configuration with larger bore casings

1. Create a copy of the geometry configuration Actual geometry and open the copy for editing.

2. Change:

   • description to Bigger geometry
   • casing and liner to these:

   

3. Apply and save this new geometry configuration.

Creating a new BottomUp discharge simulation with this geometry

1. Create a copy of the discharge simulation Better Bu 100 t/hr and open the copy for editing.

2. Change:

   • description to Bigger geometry Bu
   • geometry index to Bigger geometry:

   The other default values are correct, because we are not modelling other changes.

   

3. Run and save the discharge simulation.

Creating a new output simulation with this discharge simulation

1. Create a copy of the output simulation From better Bu 100 t/hr and open the copy for editing.

2. Change:

   • description to Bigger geometry
   • discharge simulation to Bigger geometry Bu
   • untick Calc Drawdown so we can specify a linear drawdown factor; the default, 0.118 bar/t/hr is correct, so there is no need to enter it

   The other default values (such as reservoir pressure) are correct, because we are not modelling other changes.

   

3. Run and save the output simulation.

Comparing the two output simulations with different geometries

1. In MY WELL's Output Simulations window, tag :

   • Bigger geometry

   • a TopDown output simulation (uses actual geometry), such as From better TD 100 t/hr.

2. Click to see the two output simulations:

   

   The red line is for the larger bore geometry.