Sidetrack drilling multilateral well heat removal device suitable for hot dry rock development and heat removal method thereof

Abstract

The invention discloses a sidetrack drilling multilateral well heat removal device suitable for hot dry rock development and a heat removal method thereof, and relates to the technical field of heat energy exploitation. The sidetrack drilling multilateral well heat removal device comprises a main well, a technical casing, a branch well, an exploitation oil pipe, an exploitation tee joint, an injection tee joint and a packer, wherein the main well comprises a non-development well section and a production well section, and the non-development well section is located above the production well section; the technical casing is arranged in the non-development well section in a sleeved mode; the upper end of the branch well is connected to the side wall of the technical casing, the branch well communicates with the technical casing, and the lower end of the branch well is located on ta dry hot rock stratum; the exploitation oil pipe is located in the technical casing, the lower end of the exploitation oil pipe is connected with an impeller pump, and the impeller pump is connected with a power device; the exploitation tee joint is fixed at the upper end of the exploitation oil pipe, and a liquid outlet of the exploitation tee joint communicates with the exploitation oil pipe; the injection tee joint is fixed to the earth surface, and the injection tee joint is provided with a liquid inlet, an upper end injection penetrating opening and a lower end injection penetrating opening; and the packer is arranged on the outer wall of the exploitation oil pipe. Only one main well needs to be arranged on the earth surface, and the construction cost is low.

Description

technical field [0001] The invention relates to the technical field of thermal energy exploitation, in particular to a sidetracking branch well heat extraction device and a heat extraction method suitable for the development of hot dry rock. Background technique [0002] Hot dry rock is an emerging geothermal energy source. It is a high-temperature rock mass with a general temperature greater than 180°C and a buried depth of several kilometers. There is no fluid inside or only a small amount of underground fluid (dense and impermeable). The stock is huge. [0003] Hot dry rock has outstanding characteristics such as large resources, zero pollution emissions, good safety, and thermal energy continuity that is not restricted by seasons. It is a feasible and competitive clean energy. At present, the method of establishing EGS engineering is generally used to mine hot dry rock resources. Generally, a vertical well is first drilled as an injection well, and then hydraulic fractu...

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Problems solved by technology

[0004] However, the above method needs to drill a few more production wells on the basis of the injection well, which will increase the construction cost and increase the damage to the surface vegetation.

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