CAJ | 학술논문

为解决棱状钻具的强度匹配问题，应用实体设计和数值分析软件，建立不同结构棱状钻具力学分析模型，对其进行强度分析，优化棱状钻具结构。分析结果表明，常规棱状类钻具整体强度匹配不合理，丝扣位置存在受力薄弱点，安全系数较低且整体分布不均衡。可采取加大接头直径、优化接头及棱边结构、应用摩擦焊接工艺等技术手段提高棱状钻具整体强度；改进后的棱状钻杆，整体安全系数分布均衡、波动小，钻杆整体力学性能得到了有效的提高。通过工程应用，解决了煤矿复杂条件煤层钻孔施工丢钻、断钻频繁的被动局面，平均深度超过了设计深度，钻进效率提高20％，未出现断钻、掉钻事故。
위해결릉상찬구적강도필배문제，응용실체설계화수치분석연건，건립불동결구릉상찬구역학분석모형，대기진행강도분석，우화릉상찬구결구。분석결과표명，상규릉상류찬구정체강도필배불합리，사구위치존재수력박약점，안전계수교저차정체분포불균형。가채취가대접두직경、우화접두급릉변결구、응용마찰한접공예등기술수단제고릉상찬구정체강도；개진후적릉상찬간，정체안전계수분포균형、파동소，찬간정체역학성능득도료유효적제고。통과공정응용，해결료매광복잡조건매층찬공시공주찬、단찬빈번적피동국면，평균심도초과료설계심도，찬진효솔제고20％，미출현단찬、도찬사고。
To solve the problem in strength matching of prismatic drilling rod , the mechanical analysis model of dif-ferent prismatic drilling rods were established by the physical design and numerical analysis software , and its strength and edges structure were analyzed .The results showed that the strength matching of conventional prismatic drilling rod is unreasonable .The thread of drilling rod exists the problems of vulnerabilities , lower safety factor and unbalance distribution .The technical means , such as increasing the diameter of the joint , optimizing joint and edge structure , and applying friction welding technology etc ., were adopted to improve the overall strength of the pris-matic drilling rod.The overall safety factor of improved prismatic drilling rod had more balanced distribution and less undulation , and the overall mechanical properties of the drilling rod were effectively improved .By engineering application , the problems of drilling rod dropping and breaking frequently when drilling in complex conditions coal seam were solved .The average depth of borehole exceeded the design depth , and the drilling efficiency improved by 20%, without the accidents of drilling rod dropping and breaking during the test .