| 摘要 |
Casing window milling assemblies include a conically-shaped section disposed along the tubular of the assembly. This conically-shaped section is a non-cutting portion that is preferably tapered toward the mill head. The conically-shaped section may be part of a flex-joint section of the assembly. Alternatively, the conically-shaped section may be its own sub-assembly secured above the flex-joint. In still another embodiment, the conically-shaped tapered section may be part of the upper mill section of the casing window milling assembly. In one embodiment, the conically-shaped section is disposed along the upper mill section below one or more secondary mills such as a reaming mill and a honing mill.
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