This feature helps you pick the best weak point (or disconnect, in the case of coiled tubing) for the job.

 Step 1: you define what the constraints are for the weak point. The lower limit is considered the working limit for the cable, usually a manufacturer recommendation or company policy. The upper limit is the maximum allowable tension on the cable, at which point the conductors (if any) may be damaged beyond repair but the cable is still intact.

Step 2: the process of running into and out of the well is modeled by Cerberus, and a chart is made of Cable Head Tension with certain key points noted. The chart starts at zero and ends at the breaking strength of the cable. The maximum cable head tension in normal conditions is marked towards the left. The points corresponding to the upper and lower limits (50% and 65% in this example) are also shown. We want the weak point to be strong enough to allow us to reach 50% (to maximize the available overpull), while weak enough to fail before we reach 65% (so as not to approach the breaking strength of the cable).

Some standard weak points can be selected from a list, or the user can select her own values. The new weak point is shown (in blue) in the context of the upper and lower limits. In the example below, the weak point is a little too strong – the 65% limit will be exceeded, but not by much, so the engineer might be comfortable with this selection since it represents a worst-case scenario.