随钻声波仪器刻槽钻铤结构分析

摘要

In order to improve the measure precision of acoustic instrument while drilling, regular grooves are usually processed on a drill collar between transmitter and receiver. But the mechanical strength of drill collar will be reduced under the influence of grooves,so it is necessary to analyze and check the mechanical strength of drill collar.In this paper,software SolidWorks and its finite element analysis module were used to analyze the influences of dif-ferent ring groove parameters on drill collar strength, when tensions or composition of com-pression, torsion and bend were acted on drill collar. The results show that stress in ring groove is much larger, and stress concentration can be found in ring groove. The deeper the depth of ring groove, the smaller the cross section of drill collar in the region of ring groove, and the worse the mechanical strength of drill collar.Stress concentration can be reduced by round chamfers in ring grooves.Research results show that in order to improve the mechani-cal strength of drill collar,depth of ring groove should be reduced,cross-section area of drill collar should be increased,and radius of round chamfers in ring grooves should be optimized based on the acoustic characteristics, also width, spacing, and number of ring groove. All these research results may provide a foundation for the structural design of acoustic instru-ment.%随钻声波仪器通常需要在发射器和接收器之间安装一根刻有规律排列的凹槽的钻铤来阻隔钻铤波,以提高仪器的测量精度,但凹槽会降低钻铤的机械强度,因此在设计时有必要对刻槽钻铤进行有限元分析与校核.本文利用SolidWorks及其有限元分析模块,分析了刻环形槽钻铤在受拉力作用或受压、扭、弯共同作用时,环形槽参数对钻铤强度的影响.计算结果显示,环形槽区域应力较大,环形槽根部会出现应力集中;环形槽越深,刻槽区域钻铤截面积越小,钻铤机械强度越差;环形槽根部增加导圆角会减少应力集中.研究结果表明,为了提高刻环形槽钻铤的机械强度,应该减小环形槽的深度,增大刻槽区域钻铤截面积,并根据声学特性,优化环形槽根部倒圆角半径、环形槽宽度、间隔以及数量等等.上述研究成果为随钻声波仪器的设计提供了依据.