|Title||Optimization of Hot-Water Drilling in Ice with Near-Bottom Circulation|
|Author(s)||Gaoli Zhao , Pavel Talalay, Xiaopeng Fan, Nan Zhang, Yunchen Liu, Ting Wang, Yanji Chen|
Hot-water drilling in ice with near-bottom circulation is more advantageous than traditional hot-water drilling with all-over borehole circulation in terms of power consumption and weight. However, the drilling performance of this type of drill has been poorly studied. Initial experiments showed that drilling with single-orifice nozzles did not proceed smoothly. To achieve the best drilling performance, nozzles with different orifice numbers and structures are evaluated in the present study. The testing results show that a single-orifice nozzle with a 3 mm nozzle diameter and a nine-jet nozzle with a forward angle of 35° had the highest rate of penetration (1.7–1.8 m h−1) with 5.6–6.0 kW heating power. However, the nozzles with backward holes ensured a smoother drilling process and a larger borehole, although the rate of penetration was approximately 13% slower. A comparison of the hollow and solid thermal tips showed that under the same experimental conditions, the hollow drill tip had a lower flow rate, higher outlet temperature, and higher rate of penetration. This study provides a prominent reference for drilling performance prediction and drilling technology development of hot-water drilling in ice with near-bottom circulation.
|Special Collections||Ice Drilling Technology Publication|
|Categories||Hot Water Drilling|
|Citation||Gaoli Zhao , Pavel Talalay, Xiaopeng Fan, Nan Zhang, Yunchen Liu, Ting Wang, Yanji Chen ( 2022 ) Optimization of Hot-Water Drilling in Ice with Near-Bottom Circulation. Water , 14 , 127 , 1-13 . doi: 10.3390/w14010127|