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Title: Storage capacity in hot dry rock reservoirs

Abstract

A method is described for extracting thermal energy, in a cyclic manner, from geologic strata which may be termed hot dry rock. A reservoir comprised of hot fractured rock is established and water or other liquid is passed through the reservoir. The water is heated by the hot rock, recovered from the reservoir, cooled by extraction of heat by means of heat exchange apparatus on the surface, and then re-injected into the reservoir to be heated again. Water is added to the reservoir by means of an injection well and recovered from the reservoir by means of a production well. Water is continuously provided to the reservoir and continuously withdrawn from the reservoir at two different flow rates, a base rate and a peak rate. Increasing water flow from the base rate to the peak rate is accomplished by rapidly decreasing backpressure at the outlet of the production well in order to meet periodic needs for amounts of thermal energy greater than a baseload amount, such as to generate additional electric power to meet peak demands. The rate of flow of water provided to the hot dry rock reservoir is maintained at a value effective to prevent depletion of themore » liquid inventory of the reservoir. 4 figs.« less

Inventors:
Issue Date:
Research Org.:
University of California
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
563668
Patent Number(s):
5,685,362
Application Number:
PAN: 8-589,830
Assignee:
Univ. of California, Alameda, CA (United States) PTO; SCA: 150906; PA: EDB-98:013796; SN: 98001896364
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 11 Nov 1997
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; HOT-DRY-ROCK SYSTEMS; HEAT EXTRACTION; FRACTURED RESERVOIRS; FLUID INJECTION; HEAT EXCHANGERS; INJECTION WELLS; GEOTHERMAL WELLS; RECYCLING; FLOW RATE; WATER

Citation Formats

Brown, D.W. Storage capacity in hot dry rock reservoirs. United States: N. p., 1997. Web.
Brown, D.W. Storage capacity in hot dry rock reservoirs. United States.
Brown, D.W. Tue . "Storage capacity in hot dry rock reservoirs". United States.
@article{osti_563668,
title = {Storage capacity in hot dry rock reservoirs},
author = {Brown, D.W.},
abstractNote = {A method is described for extracting thermal energy, in a cyclic manner, from geologic strata which may be termed hot dry rock. A reservoir comprised of hot fractured rock is established and water or other liquid is passed through the reservoir. The water is heated by the hot rock, recovered from the reservoir, cooled by extraction of heat by means of heat exchange apparatus on the surface, and then re-injected into the reservoir to be heated again. Water is added to the reservoir by means of an injection well and recovered from the reservoir by means of a production well. Water is continuously provided to the reservoir and continuously withdrawn from the reservoir at two different flow rates, a base rate and a peak rate. Increasing water flow from the base rate to the peak rate is accomplished by rapidly decreasing backpressure at the outlet of the production well in order to meet periodic needs for amounts of thermal energy greater than a baseload amount, such as to generate additional electric power to meet peak demands. The rate of flow of water provided to the hot dry rock reservoir is maintained at a value effective to prevent depletion of the liquid inventory of the reservoir. 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {11}
}