【Key words】 one-cone bit； singular cone； well-bottom trace； well-bottom fluid field； the results of breaking rock；
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But now the use of the spherical one-cone bit shows that the teeth are abrade heavily in advance, which affects the velocity and life of the bit.
但是目前油田上使用的球形单牙轮钻头由于牙齿先期磨损严重，影响了钻头的机械钻速和寿命。
As a result it is necessary to design new type of one-cone bit according to the quality of the rock.
因此应针对不同性质的岩石设计符合其破岩特点的单牙轮钻头。
To resolve the above problems we have designed a singular one-cone bit. We analyzed the bit to understand the mechanism, the result of breaking the rock, the characters of the fluid field.
针对以上问题设计了一种复锥面异形牙轮单牙轮钻头，为了研究设计的钻头结构是否合理、钻头的井底破岩效果、钻头的井底流场特性等问题，对试验钻头进行了一系列的分析。
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