Prediction Method and Experimental Study of Cone/Bit Speed Ratio of Roller Cone Bit

Based on fundamental theory and proceeding from major factor influencing the cone/bit speed ratio, the calculation model for calculating the average cone/bit speed ratio is to be derived. To contrast verify model calculated results with experimental results, they are closely coincide with each other. And further amend the model associating with tooth row and cone structural characters and drilling environment to make the cone/bit speed ratio more reasonable than calculation model. The cone/bit speed ratio calculation model is simple. The parameter in the model is precise and it is easy to get and convenient to calculate practically. The cone/bit speed ratio calculation model provides roller cone bit design, analysis and rock breaking mechanism research with effective theoretical foundation. The model is of high value for application.