底部钻具组合动力学模型及涡动特性仿真  

Dynamics model and whirl features' simulation of bottom hole assembly

作　　者：狄勤丰[1,2] 王文昌[1,2] 姚永汉[1,2] 朱卫平[1,2] 姚建林[1,2] 胡以宝[1,2] 

机构地区：[1]上海大学上海市应用数学和力学研究所,上海200072 [2]上海市力学在能源工程中的应用重点实验室,上海200072

出　　处：《中国石油大学学报（自然科学版）》2010年第3期53-56,共4页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(50674065;50874071);国家重大专项子课题(2008ZX05024-003);上海大学创新基金项目

摘　　要：根据转子动力学理论,把底部钻具组合(BHA)简化成Jeffcott转子模型,同时考虑不同钻压形式对BHA的作用建立BHA的动力学模型,并对BHA的动力学特性进行数值仿真。结果表明:钻压的形式只影响恢复力项,对动力学模型的一般形式无影响;在不同钻压形式的作用下,BHA的动力学特性总体上保持一致;钻压为常数时BHA主要体现为经过一段时间的波动后转为规则向后涡动的特性,钻压为波动值时底部钻具组合也主要体现为向后涡动的特性,但BHA更容易贴着井壁运动。According to the theory of rotor dynamics,bottom hole assembly（BHA） was seemed as Jeffcott＇s rotor model.And a dynamic model of BHA was established by taking into account different forms of weight on bit and its dynamic properties were simulated.The results show that weight on bit has nothing to do with the model form but the restoring force.With the different forms of weight on bit,the dynamic properties of model are coincident as a whole.The dynamic features of BHA mainly reflect in the volatility over a period of time and change to the regular backward whirl when weight on bit is constant,while the properties of BHA also mainly reflect as the regular backward whirl but the motion of BHA can be easier to cling to the borehole wall when weight on bit is not constant.

关 键 词：底部钻具组合 钻压 涡动特征 转子动力学 

分 类 号：TE921.2[石油与天然气工程—石油机械设备]