Simulation Research On The Rock Breaking System Of Bit Tooth-Row Composite Locomotion

The roller cone bit is used very prevalent in the petroleum drilling, which can be fit for drilling all kinds of different stratums. The motion and force of cone bit is extraordinary complex on bottom hole. It's important to design new bits and select bits that research on the working principles, the rock disintegration theory of roller bits, and analyze the rock breaking efficiency with the varying of kinetic and structural parameters of bits and teeth.The paper analyses the rock-breaking efficiency on different kinetic and structural parameters of the tooth-low compound movement rock-breaking system with finite element technology, and makes plenty of experiments on the bit tooth-row composite locomotion. By the way we can evaluate the rock-breaking efficiency of different bits. During the research process, we set up the geometric and dynamics model of bit tooth-row composite motion rock-breaking system; analyzed the force and kinematics of bit's teeth; established extended linear Drucker-Prager model and exhausted-energy damage principle by studying all kinds of models; finished rock mechanical properties experiments and bit tooth-row composite locomotion experiments, which provide necessary basis for building and validating finite element model; lastly with the advanced Finite Element software-ABAQUS, established the simulation analysis model of bit tooth-row composite motion rock-breaking system, carried on the nonlinear dynamic contact analysis, and acquired reliable simulation analysis outcome. It is built that a new method of evaluating rock-breaking efficiency of different bits which is based upon ABAQUS finite element analysis software.