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Method of extracting heat from dry geothermal reservoirs

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专利汇可以提供Method of extracting heat from dry geothermal reservoirs专利检索,专利查询,专利分析的服务。并且Hydraulic fracturing is used to interconnect two or more holes which penetrate a previously dry geothermal reservoir, and to produce within the reservoir a sufficiently large heat-transfer surface so that heat can be extracted from the reservoir at a usefully high rate by a fluid entering it through one hole and leaving it through another. Introduction of a fluid into the reservoir to remove heat from it and establishment of natural (unpumped) convective circulation through the reservoir to accomplish continuous heat removal are important and novel features of the method.,下面是Method of extracting heat from dry geothermal reservoirs专利的具体信息内容。

1. A method of extracting energy from a dry igneous rock geothermal reservoir comprising: a. drilling a hole to such a depth as is required to encounter hot igneous rock in the range of 150* to 500* C; b. hydraulically fracturing from this hole to produce a large crack system in the rock; c. pumping cold fluid down the hole to establish underground circulation through the crack system; d. extracting thermal energy from the pressurized hot fluid rising in a shallower flow passage and then to a heat-exchanger at the surface; and e. re-introducing the cooled fluid from the heat-exchanger into the crack system.
2. The method of claim 1 in which the said cold fluid causes a second crack system to develop which is in communication with the initial crack system.
3. The method of claim 1 in which the said hole contains both the cold and hot fluid flow passages.
4. The method of claim 1 in which the temperature of said hot rock is about 300* C.
5. The method of claim 1 in which the said fluid is water.
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