基于应力分析的钻具设计方法优化  

Optimization of Drilling Tool Design Method Based on Stress Analysis

作　　者：李绪锋 王冲 刘彪 于洋 徐文浩 薛启龙[2] LI Xu-feng;WANG Chong;LIU Biao;YU Yang;XU Wen-hao;XUE Qi-long(Shengli Petroleum Engineering Co., Ltd., Drilling Technology Research Institute, Dongying 257100, China;School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;Petroleum Engineering Technology Research Institute of Northwest Oilfield Company, Urumqi 830011, China)

机构地区：[1]中石化胜利石油工程有限公司钻井工艺研究院,东营257100 [2]中国地质大学(北京)工程技术学院,北京100083 [3]西北油田分公司石油工程技术研究院,乌鲁木齐830011

出　　处：《科学技术与工程》2021年第30期12901-12908,共8页Science Technology and Engineering

基　　金：中石化集团公司科技部顺北一区钻井提速关键技术研究项目(JP18002);国家自然科学基金(42072341)。

摘　　要：钻具钻进过程中不断振动,其产生的交变应力促使钻具发生疲劳失效。钻具组合设计时多是考虑轴向应力对钻具的影响,很少考虑到振动的影响,考虑因素单一。为提高钻具钻进过程的安全性,基于钻柱所受轴向应力,考虑钻柱振动时所受动态应力,结合疲劳失效原理,建立了一种应力安全分析模型,并通过室内试验验证模型的合理性,进而分析钻柱整体在不同钻进条件下的安全系数和存在的危险位置,总结提出钻具组合优化方法。结果表明:转速对钻具的安全系数影响较大,钻压的影响程度较小;除了钻具井口位置,加重钻杆底部、钻铤底部均存在疲劳失效的可能;钻具优化方法可以提高钻具整体安全性。从应力方向角度分析了钻具的安全情况,提出了优化方法,为以后的钻具设计提供了参考。The drill string vibrates continuously in the process of drilling,and the alternating stress causes the fatigue failure of the drilling tool.In the design of drilling tool assemblies,people mainly considers the influence of axial stress on drill string,without considering the influence of vibration,and the factors considered is simple.To improve the safety of the drilling process,besides the axial stress on the drill string,the fatigue failure and the dynamic stress produced by the vibration of the drill string were taken into consideration.Then a stress and safety analysis model was established.The safety factor and dangerous position of the drill string under different drilling conditions were analyzed.The rationality of the model was verified by indoor laboratory tests.Finally,the optimization method of drilling tool assembly was summarized and put forward.The results show that the rotating speed has a great influence on the safety factor,and the influence of the weight on bit(WOB)is small.In addition to the wellhead position of the drilling tool,fatigue failure may occur at the bottom of the weighted drill pipe and the bottom of the drill collar.The proposed optimization method can improve the overall safety of drilling tool.In this paper,the safety of drilling tool is analyzed from the perspective of stress direction,and the optimization method is put forward,which provides a reference for drilling tool design in the future.

关 键 词：应力分析 疲劳失效 安全系数 方法优化 

分 类 号：TE241[石油与天然气工程—油气井工程]