基于Walker模型的空气钻井钻柱疲劳寿命算法  

Research on Predicting DWA Drive Drillstring Fatigue Life by Walker Model

作　　者：罗增[1] 林元华[1] 明传中[2] 卢强[2] 谢居良[2] 刘贵喜[3] 

机构地区：[1]西南石油大学石油管工程重点实验室,成都610500 [2]塔里木油田分公司,新疆库尔勒841000 [3]川庆钻探工程有限公司,西安710018

出　　处：《石油矿场机械》2010年第4期57-60,共4页Oil Field Equipment

基　　金：国家"新世纪优秀人才支持计划"资助项目(NCET-08-0907);四川省杰出青年学科带头人培养基金(06ZQ026-028);中国石油天然气集团公司应用基础研究项目(2008A-3005)

摘　　要：空气钻井工况中的钻柱受力非常复杂,钻柱在井下既自转又反转,且在空气锤的作用下不断地上下纵向振动,该振动对钻柱的破坏最严重,在复合载荷作用下常造成钻柱疲劳损伤。修正了钻柱轴向应力和疲劳裂纹计算公式,并运用第四强度理论计算出裂纹处的平均应力;提出新的基于Walker模型的钻柱疲劳寿命算法,并结合Walker模型的计算结果,解释了塔里木油田空气钻井钻具大量刺穿失效的原因。The combine force of the drill string is very complex during DWA. Pneumatic power hammer drive the drill string axial vibration which is the most serious factor, because it often cause the fatigue failure to the drill string. The axial stress and size of the failure crackle formula was amended in this paper, and then the average stress of the risk spots is calculated by using No. 4 strength theory and gave a new fatigue life model of the drill string： Walker model. This paper explained the drill string failure reason in Tarim Oilfield by the results calculated.

关 键 词：旋转钻井 疲劳 振动分析 Walker模型 

分 类 号：TE921.202[石油与天然气工程—石油机械设备]