Insights

Posted onFebruary 16, 2018

Houston, Texas

Composite Plug Milling: 4.5″ Casing

Composite Plug Milling: 4.5″ Casing

Matthew A. Crump, P.E., VP Lower Completions: In my previous milling article, here, I highlighted the two most popular choices for milling composite plugs in 5.5” Casing. The two choices are really centered around what type of roller cone bit, Mill Tooth or TCI, to choose. In my experience in 5.5” Casing these are really the only two options. In 4.5” casing the decision is a little more difficult. Roller Cone bits for 4.5” 13.5#/ft (114.3 mm 20 kg/m) have an OD of only 3.75” (95.25 mm). They perform well however due to their smaller size the bearings are smaller, the protection for the bearings is smaller and they generally do not last as long as their counterparts for 5.5” casing. Due to this fact many operators choose to run carbide mills or PDC bits… To continue reading, click here.