Introduction：

The casing section milling system integrates a casing section mill and a 

stall preventer. The casing section mill housing adopts a split threaded 

connection structure, eliminating auxiliary components such as movable 

Clamping Block. Major bolt holes and pin holes are removed from the 

housing, which greatly improves the overall structural strength, avoids 

cracking risks at housing hole‑opening positions, and thoroughly resolves 

failures including bolt loosening and falling off caused by vibration in 

conventional structures. Meanwhile, the structural design and manufacturing 

process of the cutter blades are optimized, delivering advantages of short 

windowing time, high section‑milling efficiency and long service life.

Under working conditions of excessive cutting depth of blades, the stall 

preventer automatically and adaptively adjusts WOB and torque to 

prevent cutter from damage due to instantaneous torque release, thus 

maximizing the overall service life of the tool.

Features and Benefits：

★ Extremely high efficiency in window cutting and milling

★ Field-replaceable blades

★ Compatible with mud motor for operations

★ Exceptionally long blade lifespan

★ Model B features no milling slots or drilled holes on the main body for 

fixing blades, delivering extremely high overall strength and superior 

adaptability to high‑grade steel applications.