全尺寸随钻扩眼钻具系统振动特性仿真研究

Simulation Study on Vibration Characteristics of Full-Size Reaming While Drilling System

随钻扩眼技术可在全面钻进的同时扩大裸眼段尺寸,在深井、超深井、小间隙井、侧钻井和复杂井况中得到了广泛应用。但对随钻扩眼过程中的振动特性和减振机理不明,扩眼作业中仍存在钻柱动力学稳定性差、扩眼质量不理想和机械钻速低等问题。为研究随钻扩眼过程中钻柱的动力学特性,建立了呼101井钻具组合长5539 m的全尺寸钻柱系统仿真模型,对随钻扩眼过程中钻具瞬态振动进行仿真分析。基于仿真结果,研究了随钻扩眼过程中钻具振动特性受钻井参数和钻具组合的影响规律。研究成果可为随钻扩眼钻井参数和钻具组合的优化提供理论依据。

Reaming while drilling technology can increase the size of the open hole while fully drilling,and has been widely used in deep wells,ultra-deep wells,small gap wells,and sidetracking wells with complex well conditions.However,due to the unclear understanding of vibration characteristics and damping mechanism during reaming while drilling,there are still some problems in reaming operation,such as poor dynamic stability of drill string,unsatisfactory reaming quality,and low rate of penetration.In order to study the dynamic characteristics of drill string during reaming while drilling,the simulation model of a full-size drill string system with a length of 5539 m was established by taking the drill assembly of Hu 101 well as an example to realize the simulation and analysis of the transient vibration of drill string during reaming while drilling.Based on the simulation results,and the effects of drilling parameters and bottom hole assembly on the vibration characteristics of drill string during reaming while drilling were studied.It can provide the theoretical basis for the optimization of drilling parameters and drilling assembly during reaming while drilling.