Section milling and pilot milling are similar in that both operations mill away large sections of casing or pipe, but they are not the same. Section milling creates an exit point in a string of casing that is equal to the bit size of the casing being milled. Pilot milling completely removes an entire casing string from the top to the point where milling stops. The resulting hole is larger than the outside diameter (OD) of the casing being milled.
Tungsten carbide buttons
Section milling and pilot milling (discussed in Chapter 12) are similar in that both operations mill away large sections of casing or pipe, but they are not the same. ...
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