Multi-purpose drilling hose for polar large-depth hot water drilling: Research on design methods and experimental validation

Hundreds of large, buried subglacial lakes have been discovered in Antarctica, and deep hot-water drilling is an essential technology for their exploration. A multifunctional drilling hose is one of the core components of this technique, as it enables high-pressure hot-water delivery, long-distance power and signal transmission, and lifting of the drilling tool. However, no existing hose integrates all these functions. This paper presents the design methodology for a new multifunctional hot-water drilling hose. Based on theoretical calculations and numerical simulations, key parameters such as the inner diameter, equivalent thermal conductivity, and reinforcement layer structure were determined. The resulting hose has an inner diameter of 40 mm and an equivalent thermal conductivity below 0.4 W/(m·K). Experimental results show that the hose has a bursting pressure of approximately 53 MPa, an ultimate tensile strength of about 178 kN, and an equivalent thermal conductivity of roughly 0.145 W/(m·K), all of which meet the design specifications. The close agreement between theoretical predictions and experimental results demonstrates both the reliability of the design method and the stability of the developed hose.