Research on Interaction Law of Drilling Parameters in Numerical Simulation of Advance Drilling
As a prediction method that can directly contact unknown surrounding rock,advanced drilling method has become an essential means to predict unfavorable geological bodies.However,due to the lack of in-depth understanding of the variation characteristics of drilling parameters,the accuracy of prediction results is often insufficient.In order to find out the mutual influence law of drilling parameters in the drilling process,this paper uses the Holmquist-Johnson-Cook constitutive model to simulate the rock.In the drilling process,the SPH-FEM contact coupling algorithm is used for simulation test.After the initialization of the original rock stress,three groups of test conditions are set up to change the propulsion pressure,torque and rotational speed to obtain the mutual influence law of the drilling parameters of the advanced drilling.The simulation results show that the matching of propulsion pressure and torque can maintain a stable drilling process,and too large propulsion pressure and too small torque will lead to drilling stagnation.Too small propulsion pressure and too large torque will lead to drill teeth sliping rock surface and wear drilling tools;the rotational speed is inversely proportional to the change of propulsion pressure and proportional to the change of torque.In a certain range,increasing the rotational speed can improve the drilling speed.The mutual influence law between drilling parameters obtained by simulation experiments can provide some help for data interpretation of advanced geological prediction and improvement of drilling technology.
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