摘要
油气井钻进破岩过程发生于地下几千米,难以获取井底钻具组合的运动状态。井底钻具组合与岩石的相互作用产生多种形式的振动及振动的耦合。为进一步研究破岩引发钻进中振动的产生机理,建立了井底钻具组合钻铤段非线性动力学模型,通过数值仿真,分析了破岩过程中转速、钻井液、井底钻具组合偏心距、摩擦等对钻铤段旋转进动的影响。数值研究表明,系统参数的变化导致井底钻具组合进动轨迹的多样性和不可预测性;井底钻具组合受到外力作用,导致钻铤进动出现混沌;钻进过程中钻铤与井壁间会发生周期性碰摩现象,为研究钻进引发钻柱黏滑振动提供新的研究思路。
In the process of drilling on rock breaking in oil and gas wells,the interaction between the bottom hole assembly and the rock will produce various forms of vibrations or vibrations coupling.However,the rock breaking process takes place several kilometers underground,which makes it difficult to obtain the motion state of the bottom hole assembly.In order to further study the mechanism of vibrations caused by rock breaking,in this paper,the nonlinear dynamic model of the bottom hole assembly is established.The numerical simulation was used to analyze the influence of the rotational speed,drilling fluid,bottom hole assembly eccentricity and friction on the precession of the drill collar during rock breaking.Simulation results show that changes in system parameters can lead to multiple forms of drill collar rotation trajectories and even chaos.And periodic rubbing phenomenon occurs between the drill collar and the borehole,which provides a new research idea for studying the stick-slip vibrations of the drill-string caused by rock breaking.
作者
付蒙
李江红
王墨泉
蒋妮
FU Meng;LI Jiang-hong;WANG Mo-quan;JIANG Ni(Beijing Power Machinery Insitute,CASIC,Beijing 100074,China;School of Power and Energy,Northwestern Polytechnical University,Xi'an Shanxi 710072,China)
出处
《计算机仿真》
北大核心
2021年第8期253-257,共5页
Computer Simulation
