Figure 21-3 shows physical casings added to the sample Well. Note that there is an outer casing that goes to about 2300 feet in Wellbore 00”. At about that level, a smaller casing overlaps the larger one with a ring sealing the intersection. This second casing contains perforations that permit petroleum products to be drawn into the Well. This creates a single path from the holes at the bottom to the top of the well. This path is called a Completion (specifically Completion “X”). There is a third casing attached to the first that goes into Well Segment “C”. There are perforations in the first casing between 1400 feet and 1500 feet, as well as in the casing that is in well segment C. A solid casing inside the first one, with a plug ...

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