A kind of expansion method of geothermal pipeline well

Abstract

The invention discloses a geothermal piping shaft expansion device and a using method. The geothermal piping shaft expansion device comprises a drill bit, a rotating disc, a moving disc and a pushingdevice, wherein the moving disc is movably arranged on a geothermal piping; the rotating disc is rotationally arranged on the moving disc; the moving disc can rotate along the axis of the geothermal piping; a first motor for driving the rotating disc to rotate around the moving disc is further arranged on the moving disc; the drill bit is arranged on the lower end surface of the rotating disc; thepushing device is arranged on the moving disc. With the adoption of the device, a shaft can be expanded for arrangement of a thermal insulation layer after the geothermal piping is laid, or clearingand pore expansion are performed after the thermal insulation layer is damaged.

Description

technical field [0001] The invention relates to geothermal energy technology, in particular to a method for enlarging a geothermal pipeline well. Background technique [0002] Geothermal energy is natural thermal energy extracted from the earth's crust. This energy comes from the lava inside the earth and exists in the form of heat. It is a renewable energy source. China's current utilization of geothermal energy is dominated by direct utilization, supplemented by indirect utilization; direct utilization is the exploitation of underground hot water to utilize geothermal energy, and indirect utilization is the extraction and utilization of geothermal energy through heat exchange devices. In the long run, direct utilization is unsustainable Indirect utilization is a sustainable way of geothermal exploitation and utilization. The indirect utilization is to drill a deep well underground, run a casing in the deep well, exchange the geothermal energy outside the pipe to the worki...

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Problems solved by technology

[0003] The temperature of the rock and soil layer near the ground is similar to that of the ground and has a large temperature difference with the transmission medium. Therefore, it is necessary to install an insulation layer around the transmission pipeline. Some geothermal pipelines need to install an insulation layer after installation. Expand the geothermal well, and some have already set up the insulation layer. After a period of time, the insulation layer will be damaged by snakes, rats, insects, etc. or corroded, and the insulation effect cannot be achieved. It is necessary to repair or remove the insulation layer. reset

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