Ф14.0mm钻齿与钻头本体齿孔的过盈分析  

Interference Analysis of Ф14 mm Bit Teeth and Bit Body Hole

作　　者：孟晓平[1] 董亮亮[1] 童华[1] 王作文[1] 于小龙 赵学峰 

机构地区：[1]西南石油大学机电工程学院,四川成都610500 [2]中海石油基地集团监督监理技术公司,天津塘沽300452 [3]中国石油川庆钻探工程有限公司国际工程公司,四川成都610051

出　　处：《石油钻探技术》2011年第2期117-119,共3页Petroleum Drilling Techniques

基　　金：国家自然科学基金项目"气体钻井钻具与井壁碰摩机理及量化评价方法研究"(编号:508040480)部分研究内容

摘　　要：掉齿是影响空气钻井潜孔钻头寿命的主要原因之一,而钻齿与本体齿孔的安装过盈量直接影响固齿强度。通过建立Ф215.9 mm潜孔钻头Ф14.0 mm钻齿与钻头本体齿孔过盈装配的力学模型,对过盈量为0.040、0.060、0.065、0.070、0.075、0.080和0.100 mm时的装配应力及本体材料的径向位移进行了模拟计算,并对钻齿施加工作载荷,检验了其固齿效果。通过分析可知:过盈量小于0.065 mm时本体材料处于弹性变形状态;过盈量不小于0.080 mm时,本体齿孔的应力值较大,局部接触位置超出材料的抗压强度;过盈量为0.065～0.075 mm时,既有弹性变形又存在轻微的塑性变形,此时的固齿强度能够满足实际工况的需要。考虑到塑性硬化的作用,推荐该钻头下钻齿与本体齿孔的安装过盈量为0.065～0.075 mm。Teeth lost is one of the main reasons impacting drill bit life in gas drilling, while the interfer ence of teeth and bit body hole directly affect their contact strength. Through establishing the mechanical model for interference assembly of 4215.9 mm DTH bit with 414.0 mm drill teeth and bit body hole,the assembly stress and radial displacement for the interference of 0.040,0.060,0.065,0.070,0.075,0.080 and 0. 100 mm were simulated using computer. The analysis shows that when interference fit less than 0. 065 mm,the bit body is elastic deformation;when interference fit is not less than 0. 08mm, some parts of the contact position are beyond the local compressive strength;when the interference fit is 0. 065-0. 075 ram,it can meet the requirement of setting teeth on DTH bit.

关 键 词：气体钻井 潜孔钻头 钻齿 过盈配合 有限元法 

分 类 号：TE921.1[石油与天然气工程—石油机械设备]