Heat extraction device and heat extraction method suitable for hot dry rock stratum

Abstract

The invention discloses a heat extraction device and a heat extraction method suitable for a hot dry rock stratum, and relates to the technical field of hot dry rock resource exploitation. The heat extraction device comprises an exploiting well, an exploiting well head device, a double-wall drill rod, a heat preservation pipe, a gas-liquid mixing chamber, a compressed gas supply component, a cold water supply component and a separation treatment assembly, wherein the exploiting well head device is arranged at the top of the exploiting well, the double-wall drill rod comprises a drill rod inner pipe and a drill rod outer pipe, the heat preservation pipe is connected with the drill rod inner pipe, the lower end of the drill rod outer pipe is connected with the gas-liquid mixing chamber, a plurality of through holes are formed in the side wall of the lower end of the drill rod inner pipe and correspond to the gas-liquid mixing chamber in position, the compressed gas supply component is connected with the drill rod outer pipe, the cold water supply component is connected with the exploiting well head device, the two ends of the separation treatment assembly are connected with the drill rod inner pipe and the cold water supply component correspondingly, and the separation treatment assembly is used for gas-liquid separation and heat absorption. According to the heat extraction device and the heat extraction method, the development cost is reduced, the earthquake risk induced by large fracturing is avoided, and the recovery efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of exploitation of hot dry rock resources, in particular to a heat extraction device and a heat extraction method suitable for hot dry rock formations. Background technique [0002] At present, the method of establishing EGS engineering is generally used to exploit hot dry rock resources, that is, to drill a well as a water injection well, drill one or more wells as a production well, and use hydraulic fracturing technology to press through the production well and the injection well to form a cycle. The system injects cold water from the injection well and uses the production well to extract steam for power generation. However, the existing mining methods require the construction of multiple wells and large-scale fracturing projects, and the development cost is high. Large-scale fracturing projects are likely to induce earthquakes, and at the same time, the recovery rate is low. Contents of the invention ...

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Problems solved by technology

However, the existing mining methods require the construction of multiple wells and large-scale fracturing projects, and the development costs are high. Large-scale fracturing projects are likely to induce earthquakes and the recovery rate is low.

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