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简易的铣圈套铣速度慢，对稳定器、钻头等套铣困难或根本无法套铣。特殊铣圈是在原简易铣圈的基础上，进行力学分析，并参照金刚石钻头的布齿原理进行研制的。它克服了简易铣圈的强度问题及布齿的不合理，又比金刚石钻头布齿工艺简单，通过对特殊铣圈的结构，工作原理。铣圈合金齿的齿形和布齿方法以及齿的大小，保径结构的分析研究，规范了入井钻具结构、使用参数、操作及注意事项等。该铣圈在不同的井内落鱼结构，不同的卡钻类型以及不同的环间障碍物的实际使用中，均安全顺利的解除了事故，能满足井下各种套铣的需要。
Easy milling Sleeve milling speed slow, stability, drill bits and other milling difficult or simply can not set milling. Special milling circle is based on the original simple milling circle, the mechanical analysis, and with reference to the principle of cloth diamond gear bit to develop. It overcomes the problem of the strength of the simple milling circle and the irrational cloth teeth, but also simpler than the diamond bit cloth teeth technology, through the special milling ring structure, working principle. Milling circle alloy tooth profile and cloth teeth as well as the size of the tooth, Paul diameter structure of the analysis and study, regulating the drilling tool structure, the use of parameters, operation and precautions. The milling ring in different wells within the fish structure, different types of stuck-card and different ring between the actual use of obstacles, safe and successful lifting of the accident, to meet the needs of a variety of underground milling.