Research and application of deep-hole drilling construction technology with portable drilling rig

Abstract:

To address the challenges of difficult transportation， stringent site requirements， high construction costs， and low hard-rock drilling efficiency when using conventional large drilling rigs for deep-hole drilling in high-altitude and complex terrains. Through systematic technical research and innovation， a comprehensive technical system for deep-hole drilling with portable rigs has been established. In site construction， an innovative site layout approach was adopted， incorporating a "rubble concrete base platform + double anchor rod anchoring" installation method， which effectively resolves the constraints of rugged terrain and the requirement for equipment stability. In equipment configuration， the selection of drill pipes， bits， and other auxiliary components was optimized， and the gripper support structure was improved to enhance load capacity. In drilling techniques， a four-stage borehole structure was designed， and process improvements were implemented to increase hard-rock drilling efficiency. The "power head nodding effect" was identified as a factor influencing drill pipe service life， and the "JFC drilling fluid analysis method" was proposed for real-time drilling fluid performance optimization. Preventive measures for downhole accidents and an innovative "spring-type" stuck pipe release technique were introduced. Additionally， a multi-dimensional green exploration system was established to meet the environmental requirements of no road construction and minimal disturbance within the drilling area. Field application results demonstrate that all borehole indicators meet the specifications， achieving one of the deepest boreholes drilling with portable rigs in recent years. This technical system provides a reliable reference for deep-hole drilling projects in similar high-altitude and complex terrains.