The Toolfit Wizard is a calculator utility used to figure what size tool (length, outer diameter) will fit around a given bend (radius) in a given well (inner diameter).  The main calculation is pure geometry, but there are some interesting advanced features (some of which are still in development and will be added during 2002 – see Future Plans below).

You choose which parameter you wish to calculate from the combo box at the bottom of the screen. The other parameters you specify on the three tabs Tool String, Well Geometry and Survey Data. Once you have made your selections, you click the calculate button to get the result. For example, to find the maximum tool diameter which will fit:

 Or, to find the minimum well radius (dogleg severity) the given tool will fit around:

Or, to find the maximum tool length which will fit:

Note that the above calculations are for a rigid tool (it is assumed not to bend). However, Cerberus is a forces model and hence can calculate what force is required to make the tool pass the curve, even if the tool must bend to do so. Some additional inputs are required for this calculation (for example, Young’s Modulus).

If the tool can pass without bending, the following result is returned:

If bending is required, the message looks like this:

If the force is quite small, you may be able to proceed with the job in the knowledge that you can still get past the high dogleg, although some additional tool weight might be advised.

In release 7.0 (end 2002) we intend to add the following

• scan the current Cerberus project and determine the same results for a real well and toolstring, as opposed to the hypothetical and simplistic scenario addressed by the existing Toolfit Wizard.

• make it possible to analyze strings with more than one tool of varying dimensions.

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