METAL MUNCHER AMT milled perforated casing in a single trip, saved rig time
An operator in Aberdeen needed to cut a section in 9 ⅝ -in. N-80 casing at 3,149 ft (960 m). The casing had perforations at 12 shots per foot (SPF), so cutting the section without damaging the section mill knives would be a challenge.
To cut and mill the section, Baker Hughes, a GE company (BHGE), deployed a Model D™ section mill designed for milling perforated casing in production zones. The knives were dressed with special METAL MUNCHER™ advanced milling technology (AMT) carbide to provide the robustness and enhanced cutting performance needed to mill through the perforated casing.
After conducting a surface test, the BHGE team tripped the bottomhole assembly (BHA) in hole to the cutting depth, then began rotating the string at 80 rpm with 450 gal/min and 3,500 to 5,000 lb (1587.6 to 2268 kg) of torque. The rpm was then increased to 120 and 500 gal/min, and the team observed a 50 psi (3.45 bar) pressure drop at surface, confirming the cut was successfully made.
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