Same-well extraction and injection system for medium-deep-strata terrestrial heat

Abstract

The invention discloses a same-well extraction and injection system for medium-deep-strata terrestrial heat. The same-well extraction and injection system for medium-deep-strata terrestrial heat comprises a heat taking and heating assembly, and an underground heat extraction assembly, wherein the underground heat extraction assembly comprises a terrestrial heat well and a heat insulation pipe; theterrestrial heat well adopts a metal well wall; the metal well wall is provided with an upper-part sieve pipe and a lower-part sieve pipe at the part of a water-containing heat storage layer; a wateroutlet channel is formed in the heat insulation pipe; an annular space between the heat insulation pipe and the metal well wall forms a water inlet channel; and a packer is arranged in the water inlet channel between the upper-part sieve pipe and the lower-part sieve pipe. According to the same-well extraction and injection system for medium-deep-strata terrestrial heat, the flowing of injectionwater into the water-containing heat storage layer can be guaranteed through the action of the packer; moreover, the water-containing heat storage layer has the static pressure action of the upper part and the pumping action of the bottom simultaneously, so that the drive force of reinjection can be ensured; meanwhile, full-well-section heat taking is realized through the heat conduction of upper-part rock and lower-part convection heat exchange, so that the single-well heat taking amount is greatly increased, and drilling for a reinjection well is avoided; and moreover, the heat taking amountis greater than the heat taking amount of single-well closed heat taking, so that the utilization range of the terrestrial heat well with a low water outlet amount is expanded, and the investment risk is lowered.

Description

technical field [0001] The invention relates to geothermal heating technology, in particular to a middle-deep geothermal well irrigation system. Background technique [0002] The smog in northern my country is severe, and heating in winter further aggravates the smog. At this stage, there is an urgent need for clean energy heating technology. Geothermal energy, as a clean energy source, is getting more and more attention in northern heating. However, in the implementation process of geothermal heating at present, it is facing the problem of high cost and high risk of geothermal exploration and drilling. Especially when drilling hydrothermal geothermal wells, geothermal wells with low water output often appear. This situation increases the investment risk of enterprises and hinders the rapid and large-scale promotion of geothermal heating to a certain extent. It is a pity that the geothermal wells with low water output are abandoned. If water is to be pumped and used, the w...

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Problems solved by technology

However, in the implementation process of geothermal heating at present, it is facing the problem of high cost and high risk of geothermal exploration and drilling

Especially when drilling hydrothermal geotherma

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