Dry hole type thermal shock rotary coring drilling tool

Abstract

A dry hole type thermal shock rotary coring drilling tool belongs to the field of drilling tools, the drilling tool comprises a drilling tool outer pipe, an electric shock device, an electric rotary device and a sampling device, the electric shock device, the electric rotary device and the sampling device are arranged in the drilling tool outer pipe, and the sampling device comprises a drilling tool inner pipe, a second slip ring, a miniature vacuum liquid pump, a melt water conveying pipe, a water storage pipe, an ice core cutter, a hot melting drill bit and an ice core pipe. Impact rotation and hot melting drilling are combined, pollution to an ice layer caused by using drilling fluid can be avoided, and drill jamming accidents occurring in a hole are effectively avoided. The impact drilling not only enables the ice layer at the bottom of the hole to generate micro cracks, but also can transmit the heat of the hot melting drill bit into the micro cracks in a pulse form, so that the strength and cutting resistance of the ice layer are reduced, and the drilling efficiency is improved. In the drilling process, the outer pipe of the drilling tool does not rotate, and friction between the outer wall of the drilling tool and an ice layer is avoided. The melt water conveying pipe and the water storage pipe are both heated through heating wires, blockage caused by melt water freezing is avoided, and meanwhile damage to the melt water conveying pipe and the water storage pipe caused by freezing and frost heaving is prevented.

Description

technical field [0001] The invention belongs to the field of drilling tools, and in particular relates to a dry hole type thermal shock rotary core drilling tool used for polar ice. Background technique [0002] At present, core drilling tools for polar ice mainly include armored cable mechanical impact rotary drilling tools, hot melt drilling tools and hot water drilling tools. These drilling tools have certain shortcomings and limitations in use. Among them, the drilling pressure of the drill bit of the armored cable mechanical impact rotary drilling tool is low, and the low-temperature drilling fluid used has certain toxicity. , the long diameter is relatively large, and the lower part of the drilling tool will constantly rub against the wall of the ice hole due to bending during the rotation process, which may easily cause damage to the drilling tool, resulting in the inability to continue to use reliably and safely, and must be repaired or replaced, resulting in huge ec...

AI Technical Summary

Problems solved by technology

[0002] At present, the core drilling tools for polar ice mainly include armored cable mechanical impact rotary drilling tools, hot melt drilling tools and hot water drilling tools. These drilling tools have certain shortcomings and limitations in use.

Among them, the drilling pressure of the drill bit of the armored cable mechanical impact rotary drilling tool is low, and the low-temperature drilling fluid used has certain toxicity. , the long diameter is relatively large, and the lower part of the drilling tool will constantly rub against the wall of the ice hole due to bending during the rotation process, which may easily cause damage to the drilling tool, resulting in the inability to continue to use reliably and safely, and must be repaired or replaced, resulting in huge economic losses; The melting rate of hot-melt drilling tools is very low, the energy consumption is very high, and the drilling speed is relatively slow; the hot-water drilling tools need a large enough power generation system to support the energy consumption during the drilling process, and the transportation of the whole set of equipment is difficult and the cost is too high. Moreover, the hot water will melt the ice core in the process of circulation, which seriously affects the quality of the ice core.

In view of the above problems, those skilled in the art have developed a rotary cutting ice melting drilling device, see patent document number CN108625775A for details, but because the device retains melted water in the hole as a heat transfer medium, it cannot be realized Coring drilling failed to effectively avoid the friction between the side wall and the ice layer during the rotation process

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