Well stimulation and systems for recovering geothermal heat

Power plants – Utilizing natural heat – Geothermal

Patent

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Details

165 45, 166267, 166268, 166272, F03G 700

Patent

active

040795900

ABSTRACT:
The flow from geothermal wells is stimulated by injecting a liquid at selected levels in the well with the liquid having a boiling point below the temperature of the geothermal fluid at the levels of injection at the operating pressure at the levels of injection. The geothermal fluid and vaporized injected fluid from the well are applied to a system for extracting the heat energy as well as for cleaning sand and other well depositions that may accumulate in the geothermal well. The system may include a direct contact heat exchanger having either a vertical chamber or a horizontal chamber. The contactor has a plurality of zones including a boiler zone, one or more separation zones, and at least one heat exchange zone. The contactor may also include a wash zone and a flash zone.
In the wash zone there is advantageously included recirculation trays vertically spaced for washing the vapor to remove entrained substances, such as minerals dissolved in the fluid from the geothermal wells. The recirculation trays include a manway for ease of access and service. The vaporized fluids from the contactor are passed through a power extracting gas expansion device, with the composition of the vapor being controlled to maximize the power extractable by the gas expansion device.

REFERENCES:
patent: 3580330 (1971-05-01), Maugis
patent: 3640336 (1972-02-01), Dixon
patent: 3817038 (1974-06-01), Paull et al.
patent: 3827243 (1974-08-01), Paull et al.
patent: 3864917 (1975-02-01), Jacoby

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