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利用单齿压入与刮切岩石实验建立了钻头与岩石互作用力学模型 ,实现了对钻头在钻井过程中工作行为的仿真计算 ;建立了基于研究钻柱—钻头—岩石系统动态行为的动力学模型 ,可以对钻井过程中钻压、扭矩、转速等参数的动态变化过程进行计算机仿真研究。从仿真结果可以看出 ,钻头在钻井过程中由于牙齿在井底的交替吃入以及井底本身的凹凸不平造成钻头在井底的纵向振动 ,其钻压的振幅一般为平均钻压的 30 %左右 ;同时 ,由于钻头在井底的刮切作用造成了钻头转速以及扭矩的变化 ,转速的变化相对来说较为平缓。该动力学模型能较好的描述钻柱—钻头—岩石系统的动态行为 ,对于新型钻头的设计以及钻井力学研究都有着较好的指导意义
The interaction between bit and rock was established by using single-tooth press-in and scratch-cut rock experiment, and the simulation calculation of bit’s working behavior during drilling was realized. The kinematics based on studying the dynamic behavior of drill-bit-rock system Model can simulate the dynamic changing process of drilling pressure, torque, speed and other parameters in drilling process. It can be seen from the simulation results that during the drilling process, the drill bit vibrates longitudinally at the bottom of the hole due to the teeth alternately eating in the bottom hole and the uneven bottom hole, and the amplitude of the weight-on-bit is generally 30% ; At the same time, due to the drill bit in the bottom of the scraping action caused bit speed and torque changes, the speed change is relatively flat. The dynamic model can well describe the dynamic behavior of the drill string-bit-rock system, which has a good guiding significance for the design of new bit and drilling mechanics