关键词: 牙轮钻头, 动力学, 钻柱, 岩石, 仿真软件

Abstract: The main work of the research in this paper is as follows:the interaction model of bit and rock is established which was based on the experiment of interaction between single tooth and rock.It is a good fundament for the computer simulation on working action of rock bit drilling.Setting up dynamic model to research the dynamic action of drillingstring-bit-rock system.In the dynamic action simulation of drillstring-bit-rock,based on the geometry model and kinematics model of roller cone rock bit,and the model of interaction between rock bit and rock,the dynamic models of drillstring and rock bit are established.Thereby we can calculate WOB,torque,rotate speed and so no.The follow conclusions can be obtained:The vibration of rock bit is caused by the interaction between rock bit and rock,and the swing of WOB is about 30% of the average.The change of rotate speed and torque are caused by the scraping of rock bit.The change of rotate speed is smooth.The swing of torque on bit and on the top is about 50% of the average.According to the above conclusions,we can say that the dynamic models can express the dynamic action of drillstring-bit-rock clearly.It is instructive to design new rock bit and study drilling mechanics.

Key words: roller cone bit, dynamic, drillstring, rock, simulation software