Experimental analysis of stick-slip in drilling dynamics in a laboratory test-rig

A new test-rig to analyze drilling dynamics is presented in this article. Although simple, the test-rig can represent satisfactorily some phenomena observed in deep water drilling. The test-rig results are analyzed and stick-slip cycles are explained in detail. The explanations are in agreement with available field data found in the literature. One stick-slip cycle is extracted and analyzed thoroughly. Then, other cycles are presented to show the variability of the obtained experimental data. Finally, a model that might take into account hysteric effects is proposed for the bit-rock interaction. The parameters of the proposed model are identified using the experimental data. drill-string test-rig bit-rock interaction model drill-string dynamics experimental identification hysteresis model.