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20.11 Safe Scanning Intervals
It is normally not productive to scan and report an entire well plan on a very fine grained interval. A normal practice is to scan the entire well at a rather course level and then examine the report for areas that will require finer scanning intervals. For example, the report above was generated using 30 m intervals. Examining this report you should see the separation factor approaching an important value at 2040 m. When an approach is seen like this it is important to make sure that you also scan at finer resolution to make sure you catch the real closest point. lh sb ns l c d nd h ‘ ln s’fom popos dho zon l well (blue) passing a vertical appraisal well (red) can be seen in the picture. Had a perpendicular plane scanning method been used on either well, the collision point may not have been picked up. n h g phc x mpl b low fn sc nnng n
Figure 94: Fine scanning interval graphic.
This produces the report below (figure 95) and it can be seen that in this case the close approach point occurred between 2035 and 2045 meters.
Figure 95: Fine scanning interval report.
One good approach is to scan the entire deep well sections at a 30 m or 90 ft interval and then report close approaches at a finer 5 m or 15 ft interval. Top-hole sections with great well density may require other treatments.
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