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Title: Cavitation-based hydro-fracturing technique for geothermal reservoir stimulation

Abstract

A rotary shutter valve 500 is used for geothermal reservoir stimulation. The valve 500 includes a pressure chamber 520 for holding a working fluid (F) under pressure. A rotatable shutter 532 is turned with a powering device 544 to periodically align one or more windows 534 with one or more apertures 526 in a bulkhead 524. When aligned, the pressurized working fluid (F) flows through the bulkhead 524 and enters a pulse cavity 522, where it is discharged from the pulse cavity 522 as pressure waves 200. The pressure wave propagation 200 and eventual collapse of the bubbles 202 can be transmitted to a target rock surface 204 either in the form of a shock wave 206, or by micro jets 208, depending on the bubble-surface distance. Once cavitation at the rock face begins, fractures are initiated in the rock to create a network of micro-fissures for enhanced heat transfer.

Inventors:
; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1344498
Patent Number(s):
9,574,431
Application Number:
14/224,367
Assignee:
UT-Battelle, LLC ORNL
DOE Contract Number:
AC05-00OR22725
Resource Type:
Patent
Resource Relation:
Patent File Date: 2014 Mar 25
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 42 ENGINEERING; 15 GEOTHERMAL ENERGY

Citation Formats

Wang, Jy-An John, Wang, Hong, Ren, Fei, and Cox, Thomas S. Cavitation-based hydro-fracturing technique for geothermal reservoir stimulation. United States: N. p., 2017. Web.
Wang, Jy-An John, Wang, Hong, Ren, Fei, & Cox, Thomas S. Cavitation-based hydro-fracturing technique for geothermal reservoir stimulation. United States.
Wang, Jy-An John, Wang, Hong, Ren, Fei, and Cox, Thomas S. Tue . "Cavitation-based hydro-fracturing technique for geothermal reservoir stimulation". United States. doi:. https://www.osti.gov/servlets/purl/1344498.
@article{osti_1344498,
title = {Cavitation-based hydro-fracturing technique for geothermal reservoir stimulation},
author = {Wang, Jy-An John and Wang, Hong and Ren, Fei and Cox, Thomas S.},
abstractNote = {A rotary shutter valve 500 is used for geothermal reservoir stimulation. The valve 500 includes a pressure chamber 520 for holding a working fluid (F) under pressure. A rotatable shutter 532 is turned with a powering device 544 to periodically align one or more windows 534 with one or more apertures 526 in a bulkhead 524. When aligned, the pressurized working fluid (F) flows through the bulkhead 524 and enters a pulse cavity 522, where it is discharged from the pulse cavity 522 as pressure waves 200. The pressure wave propagation 200 and eventual collapse of the bubbles 202 can be transmitted to a target rock surface 204 either in the form of a shock wave 206, or by micro jets 208, depending on the bubble-surface distance. Once cavitation at the rock face begins, fractures are initiated in the rock to create a network of micro-fissures for enhanced heat transfer.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Feb 21 00:00:00 EST 2017},
month = {Tue Feb 21 00:00:00 EST 2017}
}

Patent:

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  • An apparatus 300 for simulating a pulsed pressure induced cavitation technique (PPCT) from a pressurized working fluid (F) provides laboratory research and development for enhanced geothermal systems (EGS), oil, and gas wells. A pump 304 is configured to deliver a pressurized working fluid (F) to a control valve 306, which produces a pulsed pressure wave in a test chamber 308. The pulsed pressure wave parameters are defined by the pump 304 pressure and control valve 306 cycle rate. When a working fluid (F) and a rock specimen 312 are included in the apparatus, the pulsed pressure wave causes cavitation tomore » occur at the surface of the specimen 312, thus initiating an extensive network of fracturing surfaces and micro fissures, which are examined by researchers.« less
  • A method of fracturing a subterranean formation with a stabilized foamed fracturing fluid comprising from about 30 percent to in excess of about 95 percent by volume of carbon dioxide with the remainder comprising a substantially anhydrous liquid and a selected surfactant. The foam is formed in situ by injection of a stabilized liquid-liquid emulsion containing liquid carbon dioxide into a well bore penetrating the formation. The temperature and pressure of the emulsion is controlled to maintain the carbon dioxide in the liquid phase during injection into the well bore. Thereafter, the carbon dioxide is heated by the subterranean formationmore » to a temperature above about 88/sup 0/ F. at which time the stabilized emulsion spontaneously forms a high quality stabilized foam.« less
  • A method of fracturing a subterranean formation with a stabilized foamed fracturing fluid comprising from about 50 percent to in excess of about 96 percent by volume of carbon dioxide with the remainder comprising an aqueous liquid and a selected surfactant. The foam is formed in situ by injection of a stabilized liquid-liquid emulsion containing liquid carbon dioxide into a well bore penetrating the formation. The temperature and pressure of the emulsion is controlled to maintain the carbon dioxide in the liquid phase during injection into the well bore. Thereafter, the carbon dioxide is heated by the subterranean formation tomore » a temperature above about 88/sup 0/ F. at which time the stabilized emulsion spontaneously forms a high quality stabilized foam.« less
  • A method of fracturing a subterranean formation with a stabilized foamed fracturing fluid comprising from about 30 percent to in excess of about 95 percent by volume of carbon dioxide with the remainder comprising a substantially anhydrous liquid and a selected surfactant. The foam is formed in situ by injection of a stabilized liquid-liquid emulsion containing liquid carbon dioxide into a well bore penetrating the formation. The temperature and pressure of the emulsion is controlled to maintain the carbon dioxide in the liquid phase during injection into the well bore. Thereafter, the carbon dioxide is heated by the subterranean formationmore » to a temperature above about 88/sup 0/ F. at which time the stabilized emulsion spontaneously forms a high quality stabilized foam.« less
  • A process for creating a hot dry rock oven for the extraction of heat energy is disclosed wherein the geothermal fluid injection and withdrawal wells are brought into positive hydraulic communication during the creation of the hot dry rock oven. The oven complex is produced by fracturing the formation from a plurality of bore holes simultaneously.