Development of an intelligent drilling cuttings method drill rig for addressing suction and sticking phenomena: Field experiment

During the operation of the drilling cuttings method, frequent occurrences of suction and sticking phenomena lead to the loss of drilling tools and failure to achieve the designed borehole depth. resulting in inaccurate risk assessment for coal seam rockbursts. To address these challenges, a mechanical analysis of cuttings transport via the spiral drill pipe was conducted. This analysis identified the primary factors contributing to suction and sticking phenomena in spiral drill pipes and proposed a targeted approach for mitigating these issues. Based on this analysis, an intelligent drilling cuttings method drill rig (IDCMDR) was developed, and field experiments were conducted. The experimental results demonstrate that when suction occurs, adjusting the rotational and drilling speeds of the IDCMDR effectively controls the phenomenon. When sticking occurs, the stuck drill pipe can be addressed by injecting high-pressure gas into the borehole bottom through the hollow structure of the spiral drill pipe or by reversing its rotation. During operation, characteristic patterns in the needle movements of the thrust and torque hydraulic gauges on the IDCMDR enable the identification of suction and sticking phenomena. The development and field validation of the IDCMDR confirm the feasibility of the theoretically proposed mitigation methods.