20.3 Separation Vector Method

The separation vector method of calculating separation factor is shown below. (Note that in all these figures you are looking at the plane of the scan with the well bore centres and zones of uncertainty shown as they plot in that plane).

This has the disadvantage that it can be optimistic. In a worst case scenario it can even miss a potential collision situation as in below figure. This represents the same target and planned well as in the above example but the conditions have varied such that the lateral uncertainty is now much larger.