Modeling And Appling Of Drilling Speed Of Cutting Type PDC Bit

The reasons that PDC bit has not been used extensively and widely are potential features of PDC bit being not full displayed, and drilling parameters are not matched each other very well. In order to achieve the goal of efficient drilling and reduce drilling cost, it is necessary to establish the drilling speed model and wornout speed model of PDC bit. The corresponding and satisfactory descriptive model of drilling speed has not been established yet, in which all factors affecting on drilling speed are considered. The main affecting factor of cutter wear is analysed.The research phase and research approach are introduced. In view of structural parameter of PDC bit, the cutting action and failure mechanism are described, the main affecting factors of cutter wear are in depth analysed.In the paper, based on the massive experiment in the field, a lot of data about factors affecting on drilling speed are gotten and the factors are related with drilling speed and wornout speed of PDC bit. The multivariate stochastic models of drilling speed and wornout speed of PDC bit are established with the reliability theory. From field test data, coefficients of the factors are determined from field test data with the multiple regression method. On the basis of models, the technique and measurement reasonably using PDC bit is given and the method matching drilling parameters is proposed.