Air reverse circulation at the hole bottom in ice-core drilling

Hu, Zhonghan; Тalalay, Pavel G.; Zheng, Zijun; Cao, Pinlu; Shi, Guitao; Li, Yuansheng; Fan, Xinghua; Ma, Hongmei

doi:10.1017/jog.2018.95

Cited by 6 publications

(5 citation statements)

References 13 publications

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“…The first testing stand (Figs 3a and b) was located outdoors and operated during winter for ice-drilling tests when the ambient temperature decreased to the range from −15 to −20°C and at other times for rock-drilling tests (Talalay and others, 2017; Hu and others, 2019). Low air temperatures at the site can last for 2–3 months during winter and create good conditions for simulating the polar climate and ice drilling.…”

Section: Laboratory Testing Methodsmentioning

confidence: 99%

Antarctic subglacial drilling rig: Part II. Ice and Bedrock Electromechanical Drill (IBED)

Тalalay

Zhang

et al. 2020

Ann. Glaciol.

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A new, modified version of the cable-suspended Ice and Bedrock Electromechanical Drill (IBED) was designed for drilling in firn, ice, debris-rich ice and rock. The upper part of the drill is almost the same for all drill variants and comprises four sections: cable termination, a slip-ring section, an antitorque system and an electronic pressure chamber. The lower part of the IBED comprises an auger core barrel, reamers, a core barrel for ice/debris-ice drilling and a conventional geological single-tube core barrel or custom-made double-tube core barrel. First, the short and full-scale field versions of the IBED were tested at an outdoor testing stand and a testing facility with a 12.5 m-deep ice well. Then, in the 2018–2019 summer season, the IBED was tested in the field at a site ~12 km south of Zhongshan Station, East Antarctica, and a ~6 cm bedrock core was recovered from a 198 m-deep borehole. A total of 18 d was required to penetrate the ice sheet. The retrieved core samples of blue ice, basal ice and bedrock provided valuable information regarding the Earth's paleo-environment.

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Section: Laboratory Testing Methodsmentioning

confidence: 99%

Antarctic subglacial drilling rig: Part II. Ice and Bedrock Electromechanical Drill (IBED)

Тalalay

Zhang

et al. 2020

Ann. Glaciol.

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“…The feasibility of the ice drilling method with near-bottom air-reverse circulation was confirmed through tests with an electromechanical ice-core drill; in the tests, the cuttings were transported by the near-bottom airflow into the chip chamber, similar to the operation of the KEMS and IBED electromechanical drills, except that the liquid pump was replaced by a blower (Hu and others, 2019). Further practical evidence of the air-reverse drilling efficiency was obtained during tests of the RADIX ice drilling system in Greenland and Antarctica (J. Schwander, personal communication).…”

Section: New Approaches To the Old Challengesmentioning

confidence: 99%

Perspectives for development of ice drilling technology: continuation of the discussion

Тalalay

Hong

2020

Ann. Glaciol.

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Recently, innovations in ice drilling have yielded considerable improvements to existing drilling techniques, as well as innovative drilling technologies that can be used in new types of applications. However, some specific challenges have to be addressed for improving existing drilling methods and developing new ones: (1) combination and unification of different drilling systems; (2) facilitating ice core breaking; (3) improving existing systems and developing new rapid-access ice drilling systems; (4) reliable elimination of ice hydraulic fracturing problems; (5) developing new environment-friendly methods of drilling in the sub-glacial lake sediments; and (6) design of unconventional ice drilling systems. Possible solutions to these problems are presented herein.

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“…The CFD simulation can be used to find the aerodynamic force of the ice core at a static state with different particle Reynolds numbers; the drag coefficient can be obtained from Equation (10), and the suspension velocity can be obtained from Equation (14). The simulation results of the drag coefficient of the ice core are shown in Figure 14.…”

Section: Prediction Of the Ice Core's Maximum Velocitymentioning

confidence: 99%

“…By using air reverse circulation drilling, the presence of a double-wall drill pipe can avoid air leakage and solve the problem of difficult drilling in the snow-firn layer. Therefore, in recent years, ice drilling experts have proposed air reverse circulation continuous coring (sampling) drilling technology with high drilling efficiency and no environmental pollution [8][9][10]. The schematic diagram of ice air reverse circulation core drilling is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study of the Transport Characteristics of the Ice Core in Ice Drilling with Air Reverse Circulation

Wang

Cao

et al. 2022

JMSE

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Ice core drilling with air reverse circulation is a promising technology that uses high-speed airflow to transport the ice core from the bottom of the hole along the central passage of the drill pipe to the surface. Understanding how the ice core moves through the pipe is crucial for this technology in order to calculate the pneumatic parameters. In this paper, experimental study and the CFD dynamic mesh technique are used to analyze the ice core transport process and flow field characteristics. In order to prove the correctness of the dynamic mesh technique, the simulation results were verified with the experimental results, and it was found that all the simulation data were in agreement with the experimental data trend, and the maximum error was less than 10%. According to the study, once the ice core’s velocity reaches its maximum throughout the transport process, it does not change. The ice core’s maximum velocity increases with the diameter ratio and decreases with the length-to-diameter ratio, while eccentricity has no impact on the maximum velocity. When the air velocity reaches 21 m/s, the diameter ratio for the ice core with a length-to-diameter ratio of 2 increases from 0.80 to 0.92, and the maximum velocity increases from 8.92 m/s to 17.45 m/s. Data fitting demonstrates that the equation Vmax=−1.04V0 + 1.04Va describes the relationship between the ice core’s maximum velocity, Vmax, and air velocity, Va. Finally, we obtain the ice core’s suspension velocity model using CFD simulation to calculate the suspension velocity, V0.

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Air reverse circulation at the hole bottom in ice-core drilling

Cited by 6 publications

References 13 publications

Antarctic subglacial drilling rig: Part II. Ice and Bedrock Electromechanical Drill (IBED)

Antarctic subglacial drilling rig: Part II. Ice and Bedrock Electromechanical Drill (IBED)

Perspectives for development of ice drilling technology: continuation of the discussion

Simulation Study of the Transport Characteristics of the Ice Core in Ice Drilling with Air Reverse Circulation

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