Drilling Monitoring While Drilling and Comprehensive Characterization of Lithology Parameters

To improve the MWD technology and explore the relationship between rock parameters and drilling parameters, this paper carried out physical and mechanical experiments, built a small drilling platform ( including magnetic suction drilling, data monitoring system, rock confining pressure system ), and carried out 330 r/min, 360 r/min, 390 r/min three different specifications of the initial speed of the drilling experiment, and added 330 r/min initial speed drilling different strength rock drilling experiments. The experimental results show that rock drilling is divided into three stages: the initial stage of drilling, the crack propagation stage, and the bit retreating stage. The rotation speed has a great influence on the drilling speed, torque, weight on bit, and drilling time. According to the Pearson fitting relationship of drilling parameters, the correlation between F and PR is -0.783, indicating a strong positive correlation, and the correlation between RPM and PR is 0.827, indicating a strong negative correlation. The power function y=axb is used to fit the drilling parameters and rock parameters. The fitting effect is good, and the torque and uniaxial tensile strength R2 is as high as 0.9966. The experimental conclusion provides a theoretical basis for lithology identification in intelligent drilling and discusses the feasibility of a dynamic monitoring scheme for the drilling rig.